First Commit

Signed-off-by: YuutaW <17158086+Trumeet@users.noreply.github.com>

43 files changed, 1505 insertions, 0 deletions

diff --git a/.gitignore b/.gitignore
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index 0000000..0f1d137
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,9 @@
+*.iml
+.gradle
+/local.properties
+/.idea
+.DS_Store
+/build
+/captures
+.externalNativeBuild
+.cxx
diff --git a/.travis.yml b/.travis.yml
new file mode 100644
index 0000000..21b6967
--- /dev/null
+++ b/.travis.yml
@@ -0,0 +1,18 @@
+jdk: oraclejdk8
+language: android
+android:
+  components:
+    - build-tools-28.0.3
+    - android-28
+before_install:
+  - git clone https://github.com/Trumeet/Maven.git ./repo
+  - "./gradlew exportVersion"
+  - export VERSION=$(cat version.txt)
+script:
+  - "./gradlew :ohmysaf:uploadArchives"
+deploy:
+  provider: script
+  script: chmod +x ./deploy_repo.sh && ./deploy_repo.sh
+  on:
+    repo: Trumeet/OhMySAF
+    branch: master
\ No newline at end of file
diff --git a/README.md b/README.md
new file mode 100644
index 0000000..f918f2a
--- /dev/null
+++ b/README.md
@@ -0,0 +1,59 @@
+# Oh My SAF
+
+Android [SAF](https://developer.android.com/guide/topics/providers/document-provider) helper.
+
+# Implement
+
+1. Add [maven.yuuta.moe](https://maven.yuuta.moe) repo to your module
+
+2. Add dependency:
+
+```grooxy
+implementation 'moe.yuuta.ohmysaf:ohmysaf:<the latest version>'
+```
+
+# Main Features
+
+* Faster migrate - If you have an old project which uses `java.io.File` a lot and you would like to migrate to SAF, OMG. By using OhMySAF, you can just continue using `File` with a little hack.
+
+# Faster Migrate
+
+Imagine that you have an old project and its file operation codes look like:
+
+```java
+File theFxxkFile = new File("xxx/xxx");
+if (theFxxkFile.isFile()) {
+    theFxxkFile.delete();
+    theFxxkFile.mkdir(); // In fact, SAF does not support that.
+}
+```
+
+If you want to switch to SAF, the normal code will look like:
+
+```java
+// Assume that you've got the URI
+DocumentFile theFxxkFile = DocumentFile.fromTreeUri(context, uri);
+if (theFxxkFile.isFile()) {
+    theFxxkFile.delete();
+    // .....
+}
+```
+
+One day you discovered `OhMySAF`, your problem is solved:
+
+```java
+// Assume that you've got the URI
+
+// Magic
+File theFxxkFile = OhMySAF.ohMyTree(context, uri);
+
+// Just KEEP these old codes!
+if (theFxxkFile.isFile()) {
+    theFxxkFile.delete();
+    theFxxkFile.mkdir(); // In fact, SAF does not support that.
+}
+```
+
+# Licenses
+
+Apache 2.0
\ No newline at end of file
diff --git a/app/.gitignore b/app/.gitignore
new file mode 100644
index 0000000..796b96d
--- /dev/null
+++ b/app/.gitignore
@@ -0,0 +1 @@
+/build
diff --git a/app/build.gradle b/app/build.gradle
new file mode 100644
index 0000000..20b7511
--- /dev/null
+++ b/app/build.gradle
@@ -0,0 +1,29 @@
+apply plugin: 'com.android.application'
+
+android {
+    compileSdkVersion 28
+    defaultConfig {
+        applicationId "moe.yuuta.ohmysafdemo"
+        minSdkVersion 19
+        targetSdkVersion 28
+        versionCode rootProject.ext.version
+        versionName "1.0"
+        testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner"
+    }
+    buildTypes {
+        release {
+            minifyEnabled false
+            proguardFiles getDefaultProguardFile('proguard-android-optimize.txt'), 'proguard-rules.pro'
+        }
+    }
+}
+
+dependencies {
+    implementation fileTree(dir: 'libs', include: ['*.jar'])
+    implementation 'androidx.constraintlayout:constraintlayout:1.1.3'
+    testImplementation 'junit:junit:4.12'
+    androidTestImplementation 'androidx.test.ext:junit:1.1.0'
+    androidTestImplementation 'androidx.test.espresso:espresso-core:3.1.1'
+    implementation 'androidx.documentfile:documentfile:1.0.1'
+    implementation project(':ohmysaf')
+}
diff --git a/app/proguard-rules.pro b/app/proguard-rules.pro
new file mode 100644
index 0000000..f1b4245
--- /dev/null
+++ b/app/proguard-rules.pro
@@ -0,0 +1,21 @@
+# Add project specific ProGuard rules here.
+# You can control the set of applied configuration files using the
+# proguardFiles setting in build.gradle.
+#
+# For more details, see
+#   http://developer.android.com/guide/developing/tools/proguard.html
+
+# If your project uses WebView with JS, uncomment the following
+# and specify the fully qualified class name to the JavaScript interface
+# class:
+#-keepclassmembers class fqcn.of.javascript.interface.for.webview {
+#   public *;
+#}
+
+# Uncomment this to preserve the line number information for
+# debugging stack traces.
+#-keepattributes SourceFile,LineNumberTable
+
+# If you keep the line number information, uncomment this to
+# hide the original source file name.
+#-renamesourcefileattribute SourceFile
diff --git a/app/src/androidTest/java/moe/yuuta/ohmysafdemo/ExampleInstrumentedTest.java b/app/src/androidTest/java/moe/yuuta/ohmysafdemo/ExampleInstrumentedTest.java
new file mode 100644
index 0000000..48bd8b8
--- /dev/null
+++ b/app/src/androidTest/java/moe/yuuta/ohmysafdemo/ExampleInstrumentedTest.java
@@ -0,0 +1,27 @@
+package moe.yuuta.ohmysafdemo;
+
+import android.content.Context;
+
+import androidx.test.ext.junit.runners.AndroidJUnit4;
+import androidx.test.platform.app.InstrumentationRegistry;
+
+import org.junit.Test;
+import org.junit.runner.RunWith;
+
+import static org.junit.Assert.assertEquals;
+
+/**
+ * Instrumented test, which will execute on an Android device.
+ *
+ * @see <a href="http://d.android.com/tools/testing">Testing documentation</a>
+ */
+@RunWith(AndroidJUnit4.class)
+public class ExampleInstrumentedTest {
+    @Test
+    public void useAppContext() {
+        // Context of the app under test.
+        Context appContext = InstrumentationRegistry.getInstrumentation().getTargetContext();
+
+        assertEquals("moe.yuuta.ohmysafdemo", appContext.getPackageName());
+    }
+}
diff --git a/app/src/main/AndroidManifest.xml b/app/src/main/AndroidManifest.xml
new file mode 100644
index 0000000..03ab231
--- /dev/null
+++ b/app/src/main/AndroidManifest.xml
@@ -0,0 +1,23 @@
+<?xml version="1.0" encoding="utf-8"?>
+<manifest xmlns:android="http://schemas.android.com/apk/res/android"
+    xmlns:tools="http://schemas.android.com/tools"
+    package="moe.yuuta.ohmysafdemo">
+
+    <application
+        android:allowBackup="true"
+        android:icon="@mipmap/ic_launcher"
+        android:label="@string/app_name"
+        android:roundIcon="@mipmap/ic_launcher_round"
+        android:supportsRtl="true"
+        android:theme="@style/AppTheme"
+        tools:ignore="GoogleAppIndexingWarning">
+        <activity android:name=".MainActivity">
+            <intent-filter>
+                <action android:name="android.intent.action.MAIN" />
+
+                <category android:name="android.intent.category.LAUNCHER" />
+            </intent-filter>
+        </activity>
+    </application>
+
+</manifest>
\ No newline at end of file
diff --git a/app/src/main/java/moe/yuuta/ohmysafdemo/MainActivity.java b/app/src/main/java/moe/yuuta/ohmysafdemo/MainActivity.java
new file mode 100644
index 0000000..fbea9ad
--- /dev/null
+++ b/app/src/main/java/moe/yuuta/ohmysafdemo/MainActivity.java
@@ -0,0 +1,211 @@
+package moe.yuuta.ohmysafdemo;
+
+import android.annotation.NonNull;
+import android.annotation.Nullable;
+import android.app.Activity;
+import android.content.Intent;
+import android.graphics.Bitmap;
+import android.graphics.BitmapFactory;
+import android.net.Uri;
+import android.os.Bundle;
+import android.os.ParcelFileDescriptor;
+import android.provider.DocumentsContract;
+import android.util.Log;
+import android.view.Menu;
+import android.view.MenuItem;
+import android.view.View;
+import android.widget.ImageView;
+import android.widget.Toast;
+
+import java.io.File;
+import java.io.FileDescriptor;
+import java.io.IOException;
+import java.io.OutputStream;
+import java.util.Arrays;
+
+import moe.yuuta.ohmysaf.OhMySAF;
+
+public class MainActivity extends Activity implements View.OnClickListener {
+    private static final int RC_OPEN_DOC = 1;
+    private static final int RC_CREATE_DOC = 2;
+    private static final int RC_OPEN_TREE = 3;
+
+    private ImageView mImage;
+    private volatile Bitmap mBitmap;
+    private volatile String mFileName;
+    private Uri mUri;
+
+    @Override
+    protected void onCreate(Bundle savedInstanceState) {
+        super.onCreate(savedInstanceState);
+        setContentView(R.layout.activity_main);
+        findViewById(android.R.id.button1).setOnClickListener(this);
+        findViewById(android.R.id.button2).setOnClickListener(this);
+        mImage = findViewById(R.id.image);
+    }
+
+    @Override
+    public void onClick(View v) {
+        switch (v.getId()) {
+            case android.R.id.button1:
+                runOpenDoc();
+                break;
+            case android.R.id.button2:
+                runOpenTree();
+                break;
+        }
+    }
+
+    @Override
+    protected void onActivityResult(int requestCode, int resultCode, @Nullable Intent data) {
+        log("Activity result.....");
+        if (resultCode != RESULT_OK || data == null) return;
+        mUri = data.getData();
+        log(mUri.toString());
+        switch (requestCode) {
+            case RC_OPEN_DOC:
+                File dir1 = OhMySAF.ohMyFile(this, mUri);
+                log("Name: " + dir1.getName() + ", length: " + dir1.length() +
+                        ", canWrite: " + dir1.canWrite());
+                mFileName = dir1.getName();
+                setTitle(mFileName);
+                handleDocSelected(mUri);
+                break;
+            case RC_CREATE_DOC:
+                File dir2 = OhMySAF.ohMyFile(this, mUri);
+                log("Name: " + dir2.getName() + ", length: " + dir2.length() +
+                        ", canWrite: " + dir2.canWrite());
+                mFileName = dir2.getName();
+                setTitle(mFileName);
+                handleDocCreated(mUri);
+                break;
+            case RC_OPEN_TREE:
+                File dir = OhMySAF.ohMyTree(this, mUri);
+                log("Name: " + dir.getName() + ", length: " + dir.length() +
+                        ", files: " + Arrays.toString(dir.listFiles()) +
+                        ", canWrite: " + dir.canWrite());
+                mFileName = dir.getName();
+                setTitle(mFileName);
+                break;
+        }
+    }
+
+    private void handleDocCreated(@NonNull final Uri uri) {
+        new Thread(new Runnable() {
+            @Override
+            public void run() {
+                try {
+                    OutputStream stream = getContentResolver().openOutputStream(uri, "w");
+                    mBitmap.compress(Bitmap.CompressFormat.PNG, 100, stream);
+                    stream.flush();
+                    stream.close();
+                    log("Write done");
+                    handleDocSelected(uri);
+                } catch (IOException e) {
+                    log("Write: " + e.getMessage());
+                }
+            }
+        }).start();
+    }
+
+    private void handleDocSelected(@NonNull final Uri uri) {
+        new Thread(new Runnable() {
+            @Override
+            public void run() {
+                try {
+                    ParcelFileDescriptor parcelFileDescriptor =
+                            getContentResolver().openFileDescriptor(uri, "r");
+                    FileDescriptor fileDescriptor = parcelFileDescriptor.getFileDescriptor();
+                    mBitmap = BitmapFactory.decodeFileDescriptor(fileDescriptor);
+                    parcelFileDescriptor.close();
+                    runOnUiThread(new Runnable() {
+                        @Override
+                        public void run() {
+                            mImage.setImageBitmap(mBitmap);
+                        }
+                    });
+                } catch (final IOException e) {
+                    log(e.getMessage());
+                }
+            }
+        }).start();
+    }
+
+    private void log(@NonNull final String message) {
+        Log.i("OhMySAF", message);
+        runOnUiThread(new Runnable() {
+            @Override
+            public void run() {
+                Toast.makeText(MainActivity.this, message, Toast.LENGTH_SHORT).show();
+            }
+        });
+    }
+
+    @Override
+    public boolean onCreateOptionsMenu(Menu menu) {
+        menu.add(0, 0, 0, "Make a copy");
+        menu.add(0, 1, 0, "Delete (without confirmation!!!)");
+        menu.add(0, 2, 0, "Take persistable uri permission");
+        return true;
+    }
+
+    @Override
+    public boolean onOptionsItemSelected(MenuItem item) {
+        if (mBitmap == null) {
+            log("Select a photo and try again");
+            return false;
+        }
+        switch (item.getItemId()) {
+            case 0:
+                runCreateDoc();
+                return true;
+            case 1:
+                runDeleteDoc();
+                return true;
+            case 2:
+                runTakePersistablePermission();
+                return true;
+            default:
+                return false;
+        }
+    }
+
+    private void runOpenDoc() {
+        Intent intentOpenDoc = new Intent(Intent.ACTION_OPEN_DOCUMENT);
+        intentOpenDoc.addCategory(Intent.CATEGORY_OPENABLE);
+        intentOpenDoc.setType("image/*");
+        startActivityForResult(intentOpenDoc, RC_OPEN_DOC);
+    }
+
+    private void runCreateDoc() {
+        Intent intentCreateDoc = new Intent(Intent.ACTION_CREATE_DOCUMENT);
+        intentCreateDoc.addCategory(Intent.CATEGORY_OPENABLE);
+        intentCreateDoc.setType("image/*");
+        intentCreateDoc.putExtra(Intent.EXTRA_TITLE, "Copy_" + mFileName);
+        startActivityForResult(intentCreateDoc, RC_CREATE_DOC);
+    }
+
+    private void runDeleteDoc() {
+        try {
+            DocumentsContract.deleteDocument(getContentResolver(), mUri);
+            log("Delete done");
+            mFileName = null;
+            mBitmap = null;
+            mUri = null;
+            mImage.setImageBitmap(null);
+            setTitle(R.string.app_name);
+        } catch (IOException e) {
+            log("Delete: " + e.getMessage());
+        }
+    }
+
+    private void runTakePersistablePermission() {
+        getContentResolver().takePersistableUriPermission(mUri, Intent.FLAG_GRANT_READ_URI_PERMISSION | Intent.FLAG_GRANT_WRITE_URI_PERMISSION);
+        log("Done");
+    }
+
+    private void runOpenTree() {
+        Intent intent = new Intent(Intent.ACTION_OPEN_DOCUMENT_TREE);
+        startActivityForResult(intent, RC_OPEN_TREE);
+    }
+}
diff --git a/app/src/main/res/drawable-v24/ic_launcher_foreground.xml b/app/src/main/res/drawable-v24/ic_launcher_foreground.xml
new file mode 100644
index 0000000..1f6bb29
--- /dev/null
+++ b/app/src/main/res/drawable-v24/ic_launcher_foreground.xml
@@ -0,0 +1,34 @@
+<vector xmlns:android="http://schemas.android.com/apk/res/android"
+    xmlns:aapt="http://schemas.android.com/aapt"
+    android:width="108dp"
+    android:height="108dp"
+    android:viewportWidth="108"
+    android:viewportHeight="108">
+    <path
+        android:fillType="evenOdd"
+        android:pathData="M32,64C32,64 38.39,52.99 44.13,50.95C51.37,48.37 70.14,49.57 70.14,49.57L108.26,87.69L108,109.01L75.97,107.97L32,64Z"
+        android:strokeWidth="1"
+        android:strokeColor="#00000000">
+        <aapt:attr name="android:fillColor">
+            <gradient
+                android:endX="78.5885"
+                android:endY="90.9159"
+                android:startX="48.7653"
+                android:startY="61.0927"
+                android:type="linear">
+                <item
+                    android:color="#44000000"
+                    android:offset="0.0" />
+                <item
+                    android:color="#00000000"
+                    android:offset="1.0" />
+            </gradient>
+        </aapt:attr>
+    </path>
+    <path
+        android:fillColor="#FFFFFF"
+        android:fillType="nonZero"
+        android:pathData="M66.94,46.02L66.94,46.02C72.44,50.07 76,56.61 76,64L32,64C32,56.61 35.56,50.11 40.98,46.06L36.18,41.19C35.45,40.45 35.45,39.3 36.18,38.56C36.91,37.81 38.05,37.81 38.78,38.56L44.25,44.05C47.18,42.57 50.48,41.71 54,41.71C57.48,41.71 60.78,42.57 63.68,44.05L69.11,38.56C69.84,37.81 70.98,37.81 71.71,38.56C72.44,39.3 72.44,40.45 71.71,41.19L66.94,46.02ZM62.94,56.92C64.08,56.92 65,56.01 65,54.88C65,53.76 64.08,52.85 62.94,52.85C61.8,52.85 60.88,53.76 60.88,54.88C60.88,56.01 61.8,56.92 62.94,56.92ZM45.06,56.92C46.2,56.92 47.13,56.01 47.13,54.88C47.13,53.76 46.2,52.85 45.06,52.85C43.92,52.85 43,53.76 43,54.88C43,56.01 43.92,56.92 45.06,56.92Z"
+        android:strokeWidth="1"
+        android:strokeColor="#00000000" />
+</vector>
diff --git a/app/src/main/res/drawable/ic_launcher_background.xml b/app/src/main/res/drawable/ic_launcher_background.xml
new file mode 100644
index 0000000..0d025f9
--- /dev/null
+++ b/app/src/main/res/drawable/ic_launcher_background.xml
@@ -0,0 +1,170 @@
+<?xml version="1.0" encoding="utf-8"?>
+<vector xmlns:android="http://schemas.android.com/apk/res/android"
+    android:width="108dp"
+    android:height="108dp"
+    android:viewportWidth="108"
+    android:viewportHeight="108">
+    <path
+        android:fillColor="#008577"
+        android:pathData="M0,0h108v108h-108z" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M9,0L9,108"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M19,0L19,108"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M29,0L29,108"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M39,0L39,108"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M49,0L49,108"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M59,0L59,108"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M69,0L69,108"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M79,0L79,108"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M89,0L89,108"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M99,0L99,108"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M0,9L108,9"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M0,19L108,19"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M0,29L108,29"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M0,39L108,39"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M0,49L108,49"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M0,59L108,59"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M0,69L108,69"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M0,79L108,79"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M0,89L108,89"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M0,99L108,99"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M19,29L89,29"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M19,39L89,39"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M19,49L89,49"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M19,59L89,59"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M19,69L89,69"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M19,79L89,79"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M29,19L29,89"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M39,19L39,89"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M49,19L49,89"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M59,19L59,89"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M69,19L69,89"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M79,19L79,89"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+</vector>
diff --git a/app/src/main/res/layout/activity_main.xml b/app/src/main/res/layout/activity_main.xml
new file mode 100644
index 0000000..c00a099
--- /dev/null
+++ b/app/src/main/res/layout/activity_main.xml
@@ -0,0 +1,37 @@
+<?xml version="1.0" encoding="utf-8"?>
+<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
+    xmlns:app="http://schemas.android.com/apk/res-auto"
+    xmlns:tools="http://schemas.android.com/tools"
+    android:layout_width="match_parent"
+    android:layout_height="match_parent"
+    tools:context=".MainActivity">
+
+    <Button
+        android:id="@android:id/button1"
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        android:text="Open File"
+        app:layout_constraintBottom_toBottomOf="parent"
+        app:layout_constraintLeft_toLeftOf="parent"
+        app:layout_constraintRight_toRightOf="parent"
+        app:layout_constraintTop_toTopOf="parent" />
+
+    <Button
+        android:id="@android:id/button2"
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        android:text="Open Tree"
+        app:layout_constraintLeft_toLeftOf="parent"
+        app:layout_constraintRight_toRightOf="parent"
+        app:layout_constraintTop_toBottomOf="@android:id/button1" />
+
+    <ImageView
+        android:id="@+id/image"
+        android:layout_width="0dp"
+        android:layout_height="0dp"
+        app:layout_constraintTop_toTopOf="parent"
+        app:layout_constraintStart_toStartOf="parent"
+        app:layout_constraintEnd_toEndOf="parent"
+        app:layout_constraintBottom_toBottomOf="parent" />
+
+</androidx.constraintlayout.widget.ConstraintLayout>
\ No newline at end of file
diff --git a/app/src/main/res/mipmap-anydpi-v26/ic_launcher.xml b/app/src/main/res/mipmap-anydpi-v26/ic_launcher.xml
new file mode 100644
index 0000000..eca70cf
--- /dev/null
+++ b/app/src/main/res/mipmap-anydpi-v26/ic_launcher.xml
@@ -0,0 +1,5 @@
+<?xml version="1.0" encoding="utf-8"?>
+<adaptive-icon xmlns:android="http://schemas.android.com/apk/res/android">
+    <background android:drawable="@drawable/ic_launcher_background" />
+    <foreground android:drawable="@drawable/ic_launcher_foreground" />
+</adaptive-icon>
\ No newline at end of file
diff --git a/app/src/main/res/mipmap-anydpi-v26/ic_launcher_round.xml b/app/src/main/res/mipmap-anydpi-v26/ic_launcher_round.xml
new file mode 100644
index 0000000..eca70cf
--- /dev/null
+++ b/app/src/main/res/mipmap-anydpi-v26/ic_launcher_round.xml
@@ -0,0 +1,5 @@
+<?xml version="1.0" encoding="utf-8"?>
+<adaptive-icon xmlns:android="http://schemas.android.com/apk/res/android">
+    <background android:drawable="@drawable/ic_launcher_background" />
+    <foreground android:drawable="@drawable/ic_launcher_foreground" />
+</adaptive-icon>
\ No newline at end of file
diff --git a/app/src/main/res/mipmap-hdpi/ic_launcher.png b/app/src/main/res/mipmap-hdpi/ic_launcher.png
new file mode 100644
index 0000000..898f3ed
--- /dev/null
+++ b/app/src/main/res/mipmap-hdpi/ic_launcher.png
diff --git a/app/src/main/res/mipmap-hdpi/ic_launcher_round.png b/app/src/main/res/mipmap-hdpi/ic_launcher_round.png
new file mode 100644
index 0000000..dffca36
--- /dev/null
+++ b/app/src/main/res/mipmap-hdpi/ic_launcher_round.png
diff --git a/app/src/main/res/mipmap-mdpi/ic_launcher.png b/app/src/main/res/mipmap-mdpi/ic_launcher.png
new file mode 100644
index 0000000..64ba76f
--- /dev/null
+++ b/app/src/main/res/mipmap-mdpi/ic_launcher.png
diff --git a/app/src/main/res/mipmap-mdpi/ic_launcher_round.png b/app/src/main/res/mipmap-mdpi/ic_launcher_round.png
new file mode 100644
index 0000000..dae5e08
--- /dev/null
+++ b/app/src/main/res/mipmap-mdpi/ic_launcher_round.png
diff --git a/app/src/main/res/mipmap-xhdpi/ic_launcher.png b/app/src/main/res/mipmap-xhdpi/ic_launcher.png
new file mode 100644
index 0000000..e5ed465
--- /dev/null
+++ b/app/src/main/res/mipmap-xhdpi/ic_launcher.png
diff --git a/app/src/main/res/mipmap-xhdpi/ic_launcher_round.png b/app/src/main/res/mipmap-xhdpi/ic_launcher_round.png
new file mode 100644
index 0000000..14ed0af
--- /dev/null
+++ b/app/src/main/res/mipmap-xhdpi/ic_launcher_round.png
diff --git a/app/src/main/res/mipmap-xxhdpi/ic_launcher.png b/app/src/main/res/mipmap-xxhdpi/ic_launcher.png
new file mode 100644
index 0000000..b0907ca
--- /dev/null
+++ b/app/src/main/res/mipmap-xxhdpi/ic_launcher.png
diff --git a/app/src/main/res/mipmap-xxhdpi/ic_launcher_round.png b/app/src/main/res/mipmap-xxhdpi/ic_launcher_round.png
new file mode 100644
index 0000000..d8ae031
--- /dev/null
+++ b/app/src/main/res/mipmap-xxhdpi/ic_launcher_round.png
diff --git a/app/src/main/res/mipmap-xxxhdpi/ic_launcher.png b/app/src/main/res/mipmap-xxxhdpi/ic_launcher.png
new file mode 100644
index 0000000..2c18de9
--- /dev/null
+++ b/app/src/main/res/mipmap-xxxhdpi/ic_launcher.png
diff --git a/app/src/main/res/mipmap-xxxhdpi/ic_launcher_round.png b/app/src/main/res/mipmap-xxxhdpi/ic_launcher_round.png
new file mode 100644
index 0000000..beed3cd
--- /dev/null
+++ b/app/src/main/res/mipmap-xxxhdpi/ic_launcher_round.png
diff --git a/app/src/main/res/values/strings.xml b/app/src/main/res/values/strings.xml
new file mode 100644
index 0000000..2229dfa
--- /dev/null
+++ b/app/src/main/res/values/strings.xml
@@ -0,0 +1,3 @@
+<resources>
+    <string name="app_name">OhMySAFDemo</string>
+</resources>
diff --git a/app/src/main/res/values/styles.xml b/app/src/main/res/values/styles.xml
new file mode 100644
index 0000000..20aae62
--- /dev/null
+++ b/app/src/main/res/values/styles.xml
@@ -0,0 +1,7 @@
+<resources>
+
+    <!-- Base application theme. -->
+    <style name="AppTheme" parent="@android:style/Theme.DeviceDefault.Light">
+    </style>
+
+</resources>
diff --git a/app/src/test/java/moe/yuuta/ohmysafdemo/ExampleUnitTest.java b/app/src/test/java/moe/yuuta/ohmysafdemo/ExampleUnitTest.java
new file mode 100644
index 0000000..cd8a2b1
--- /dev/null
+++ b/app/src/test/java/moe/yuuta/ohmysafdemo/ExampleUnitTest.java
@@ -0,0 +1,17 @@
+package moe.yuuta.ohmysafdemo;
+
+import org.junit.Test;
+
+import static org.junit.Assert.assertEquals;
+
+/**
+ * Example local unit test, which will execute on the development machine (host).
+ *
+ * @see <a href="http://d.android.com/tools/testing">Testing documentation</a>
+ */
+public class ExampleUnitTest {
+    @Test
+    public void addition_isCorrect() {
+        assertEquals(4, 2 + 2);
+    }
+}
\ No newline at end of file
diff --git a/build.gradle b/build.gradle
new file mode 100644
index 0000000..9412092
--- /dev/null
+++ b/build.gradle
@@ -0,0 +1,42 @@
+// Top-level build file where you can add configuration options common to all sub-projects/modules.
+
+buildscript {
+    repositories {
+        google()
+        jcenter()
+        
+    }
+    dependencies {
+        classpath 'com.android.tools.build:gradle:3.5.0-alpha03'
+        
+        // NOTE: Do not place your application dependencies here; they belong
+        // in the individual module build.gradle files
+    }
+}
+
+allprojects {
+    repositories {
+        google()
+        jcenter()
+        
+    }
+}
+
+task clean(type: Delete) {
+    delete rootProject.buildDir
+}
+
+// Inserted by Trumeet@GitHub: add version info
+def commit = 'git rev-list --count HEAD'.execute([], project.rootDir).text.trim()
+def ver = "$commit"
+
+ext {
+    version = 1 //ver
+}
+
+task exportVersion(type: Exec) {
+    commandLine 'sh'
+    doLast {
+        file("$projectDir/version.txt").text = """$ver"""
+    }
+}
\ No newline at end of file
diff --git a/deploy_repo.sh b/deploy_repo.sh
new file mode 100755
index 0000000..1bcf137
--- /dev/null
+++ b/deploy_repo.sh
@@ -0,0 +1,21 @@
+#!/bin/sh
+
+setup_git() {
+  git config --global user.email "${MAVEN_PUSH_EMAIL}"
+  git config --global user.name "${MAVEN_PUSH_NAME}"
+}
+
+commit_files() {
+  git add .
+  git commit --author "${MAVEN_PUSH_NAME} <${MAVEN_PUSH_EMAIL}>" -m "Upload"
+}
+
+upload_files() {
+  git push https://Trumeet:${MAVEN_PUSH_TOKEN}@github.com/Trumeet/maven.git HEAD:master
+}
+
+cd repo
+setup_git
+commit_files
+upload_files
+cd ..
\ No newline at end of file
diff --git a/gradle.properties b/gradle.properties
new file mode 100644
index 0000000..199d16e
--- /dev/null
+++ b/gradle.properties
@@ -0,0 +1,20 @@
+# Project-wide Gradle settings.
+# IDE (e.g. Android Studio) users:
+# Gradle settings configured through the IDE *will override*
+# any settings specified in this file.
+# For more details on how to configure your build environment visit
+# http://www.gradle.org/docs/current/userguide/build_environment.html
+# Specifies the JVM arguments used for the daemon process.
+# The setting is particularly useful for tweaking memory settings.
+org.gradle.jvmargs=-Xmx1536m
+# When configured, Gradle will run in incubating parallel mode.
+# This option should only be used with decoupled projects. More details, visit
+# http://www.gradle.org/docs/current/userguide/multi_project_builds.html#sec:decoupled_projects
+# org.gradle.parallel=true
+# AndroidX package structure to make it clearer which packages are bundled with the
+# Android operating system, and which are packaged with your app's APK
+# https://developer.android.com/topic/libraries/support-library/androidx-rn
+android.useAndroidX=true
+# Automatically convert third-party libraries to use AndroidX
+android.enableJetifier=true
+
diff --git a/gradle/wrapper/gradle-wrapper.jar b/gradle/wrapper/gradle-wrapper.jar
new file mode 100644
index 0000000..f6b961f
--- /dev/null
+++ b/gradle/wrapper/gradle-wrapper.jar
diff --git a/gradle/wrapper/gradle-wrapper.properties b/gradle/wrapper/gradle-wrapper.properties
new file mode 100644
index 0000000..3d6e3f3
--- /dev/null
+++ b/gradle/wrapper/gradle-wrapper.properties
@@ -0,0 +1,6 @@
+#Thu Apr 18 16:18:11 PDT 2019
+distributionBase=GRADLE_USER_HOME
+distributionPath=wrapper/dists
+zipStoreBase=GRADLE_USER_HOME
+zipStorePath=wrapper/dists
+distributionUrl=https\://services.gradle.org/distributions/gradle-5.1.1-all.zip
diff --git a/gradlew b/gradlew
new file mode 100755
index 0000000..cccdd3d
--- /dev/null
+++ b/gradlew
@@ -0,0 +1,172 @@
+#!/usr/bin/env sh
+
+##############################################################################
+##
+##  Gradle start up script for UN*X
+##
+##############################################################################
+
+# Attempt to set APP_HOME
+# Resolve links: $0 may be a link
+PRG="$0"
+# Need this for relative symlinks.
+while [ -h "$PRG" ] ; do
+    ls=`ls -ld "$PRG"`
+    link=`expr "$ls" : '.*-> \(.*\)$'`
+    if expr "$link" : '/.*' > /dev/null; then
+        PRG="$link"
+    else
+        PRG=`dirname "$PRG"`"/$link"
+    fi
+done
+SAVED="`pwd`"
+cd "`dirname \"$PRG\"`/" >/dev/null
+APP_HOME="`pwd -P`"
+cd "$SAVED" >/dev/null
+
+APP_NAME="Gradle"
+APP_BASE_NAME=`basename "$0"`
+
+# Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script.
+DEFAULT_JVM_OPTS=""
+
+# Use the maximum available, or set MAX_FD != -1 to use that value.
+MAX_FD="maximum"
+
+warn () {
+    echo "$*"
+}
+
+die () {
+    echo
+    echo "$*"
+    echo
+    exit 1
+}
+
+# OS specific support (must be 'true' or 'false').
+cygwin=false
+msys=false
+darwin=false
+nonstop=false
+case "`uname`" in
+  CYGWIN* )
+    cygwin=true
+    ;;
+  Darwin* )
+    darwin=true
+    ;;
+  MINGW* )
+    msys=true
+    ;;
+  NONSTOP* )
+    nonstop=true
+    ;;
+esac
+
+CLASSPATH=$APP_HOME/gradle/wrapper/gradle-wrapper.jar
+
+# Determine the Java command to use to start the JVM.
+if [ -n "$JAVA_HOME" ] ; then
+    if [ -x "$JAVA_HOME/jre/sh/java" ] ; then
+        # IBM's JDK on AIX uses strange locations for the executables
+        JAVACMD="$JAVA_HOME/jre/sh/java"
+    else
+        JAVACMD="$JAVA_HOME/bin/java"
+    fi
+    if [ ! -x "$JAVACMD" ] ; then
+        die "ERROR: JAVA_HOME is set to an invalid directory: $JAVA_HOME
+
+Please set the JAVA_HOME variable in your environment to match the
+location of your Java installation."
+    fi
+else
+    JAVACMD="java"
+    which java >/dev/null 2>&1 || die "ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH.
+
+Please set the JAVA_HOME variable in your environment to match the
+location of your Java installation."
+fi
+
+# Increase the maximum file descriptors if we can.
+if [ "$cygwin" = "false" -a "$darwin" = "false" -a "$nonstop" = "false" ] ; then
+    MAX_FD_LIMIT=`ulimit -H -n`
+    if [ $? -eq 0 ] ; then
+        if [ "$MAX_FD" = "maximum" -o "$MAX_FD" = "max" ] ; then
+            MAX_FD="$MAX_FD_LIMIT"
+        fi
+        ulimit -n $MAX_FD
+        if [ $? -ne 0 ] ; then
+            warn "Could not set maximum file descriptor limit: $MAX_FD"
+        fi
+    else
+        warn "Could not query maximum file descriptor limit: $MAX_FD_LIMIT"
+    fi
+fi
+
+# For Darwin, add options to specify how the application appears in the dock
+if $darwin; then
+    GRADLE_OPTS="$GRADLE_OPTS \"-Xdock:name=$APP_NAME\" \"-Xdock:icon=$APP_HOME/media/gradle.icns\""
+fi
+
+# For Cygwin, switch paths to Windows format before running java
+if $cygwin ; then
+    APP_HOME=`cygpath --path --mixed "$APP_HOME"`
+    CLASSPATH=`cygpath --path --mixed "$CLASSPATH"`
+    JAVACMD=`cygpath --unix "$JAVACMD"`
+
+    # We build the pattern for arguments to be converted via cygpath
+    ROOTDIRSRAW=`find -L / -maxdepth 1 -mindepth 1 -type d 2>/dev/null`
+    SEP=""
+    for dir in $ROOTDIRSRAW ; do
+        ROOTDIRS="$ROOTDIRS$SEP$dir"
+        SEP="|"
+    done
+    OURCYGPATTERN="(^($ROOTDIRS))"
+    # Add a user-defined pattern to the cygpath arguments
+    if [ "$GRADLE_CYGPATTERN" != "" ] ; then
+        OURCYGPATTERN="$OURCYGPATTERN|($GRADLE_CYGPATTERN)"
+    fi
+    # Now convert the arguments - kludge to limit ourselves to /bin/sh
+    i=0
+    for arg in "$@" ; do
+        CHECK=`echo "$arg"|egrep -c "$OURCYGPATTERN" -`
+        CHECK2=`echo "$arg"|egrep -c "^-"`                                 ### Determine if an option
+
+        if [ $CHECK -ne 0 ] && [ $CHECK2 -eq 0 ] ; then                    ### Added a condition
+            eval `echo args$i`=`cygpath --path --ignore --mixed "$arg"`
+        else
+            eval `echo args$i`="\"$arg\""
+        fi
+        i=$((i+1))
+    done
+    case $i in
+        (0) set -- ;;
+        (1) set -- "$args0" ;;
+        (2) set -- "$args0" "$args1" ;;
+        (3) set -- "$args0" "$args1" "$args2" ;;
+        (4) set -- "$args0" "$args1" "$args2" "$args3" ;;
+        (5) set -- "$args0" "$args1" "$args2" "$args3" "$args4" ;;
+        (6) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" ;;
+        (7) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" "$args6" ;;
+        (8) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" "$args6" "$args7" ;;
+        (9) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" "$args6" "$args7" "$args8" ;;
+    esac
+fi
+
+# Escape application args
+save () {
+    for i do printf %s\\n "$i" | sed "s/'/'\\\\''/g;1s/^/'/;\$s/\$/' \\\\/" ; done
+    echo " "
+}
+APP_ARGS=$(save "$@")
+
+# Collect all arguments for the java command, following the shell quoting and substitution rules
+eval set -- $DEFAULT_JVM_OPTS $JAVA_OPTS $GRADLE_OPTS "\"-Dorg.gradle.appname=$APP_BASE_NAME\"" -classpath "\"$CLASSPATH\"" org.gradle.wrapper.GradleWrapperMain "$APP_ARGS"
+
+# by default we should be in the correct project dir, but when run from Finder on Mac, the cwd is wrong
+if [ "$(uname)" = "Darwin" ] && [ "$HOME" = "$PWD" ]; then
+  cd "$(dirname "$0")"
+fi
+
+exec "$JAVACMD" "$@"
diff --git a/gradlew.bat b/gradlew.bat
new file mode 100644
index 0000000..e95643d
--- /dev/null
+++ b/gradlew.bat
@@ -0,0 +1,84 @@
+@if "%DEBUG%" == "" @echo off

+@rem ##########################################################################

+@rem

+@rem  Gradle startup script for Windows

+@rem

+@rem ##########################################################################

+

+@rem Set local scope for the variables with windows NT shell

+if "%OS%"=="Windows_NT" setlocal

+

+set DIRNAME=%~dp0

+if "%DIRNAME%" == "" set DIRNAME=.

+set APP_BASE_NAME=%~n0

+set APP_HOME=%DIRNAME%

+

+@rem Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script.

+set DEFAULT_JVM_OPTS=

+

+@rem Find java.exe

+if defined JAVA_HOME goto findJavaFromJavaHome

+

+set JAVA_EXE=java.exe

+%JAVA_EXE% -version >NUL 2>&1

+if "%ERRORLEVEL%" == "0" goto init

+

+echo.

+echo ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH.

+echo.

+echo Please set the JAVA_HOME variable in your environment to match the

+echo location of your Java installation.

+

+goto fail

+

+:findJavaFromJavaHome

+set JAVA_HOME=%JAVA_HOME:"=%

+set JAVA_EXE=%JAVA_HOME%/bin/java.exe

+

+if exist "%JAVA_EXE%" goto init

+

+echo.

+echo ERROR: JAVA_HOME is set to an invalid directory: %JAVA_HOME%

+echo.

+echo Please set the JAVA_HOME variable in your environment to match the

+echo location of your Java installation.

+

+goto fail

+

+:init

+@rem Get command-line arguments, handling Windows variants

+

+if not "%OS%" == "Windows_NT" goto win9xME_args

+

+:win9xME_args

+@rem Slurp the command line arguments.

+set CMD_LINE_ARGS=

+set _SKIP=2

+

+:win9xME_args_slurp

+if "x%~1" == "x" goto execute

+

+set CMD_LINE_ARGS=%*

+

+:execute

+@rem Setup the command line

+

+set CLASSPATH=%APP_HOME%\gradle\wrapper\gradle-wrapper.jar

+

+@rem Execute Gradle

+"%JAVA_EXE%" %DEFAULT_JVM_OPTS% %JAVA_OPTS% %GRADLE_OPTS% "-Dorg.gradle.appname=%APP_BASE_NAME%" -classpath "%CLASSPATH%" org.gradle.wrapper.GradleWrapperMain %CMD_LINE_ARGS%

+

+:end

+@rem End local scope for the variables with windows NT shell

+if "%ERRORLEVEL%"=="0" goto mainEnd

+

+:fail

+rem Set variable GRADLE_EXIT_CONSOLE if you need the _script_ return code instead of

+rem the _cmd.exe /c_ return code!

+if  not "" == "%GRADLE_EXIT_CONSOLE%" exit 1

+exit /b 1

+

+:mainEnd

+if "%OS%"=="Windows_NT" endlocal

+

+:omega

diff --git a/ohmysaf/.gitignore b/ohmysaf/.gitignore
new file mode 100644
index 0000000..796b96d
--- /dev/null
+++ b/ohmysaf/.gitignore
@@ -0,0 +1 @@
+/build
diff --git a/ohmysaf/build.gradle b/ohmysaf/build.gradle
new file mode 100644
index 0000000..7c421e9
--- /dev/null
+++ b/ohmysaf/build.gradle
@@ -0,0 +1,46 @@
+apply plugin: 'com.android.library'
+
+android {
+    compileSdkVersion 28
+
+
+    defaultConfig {
+        minSdkVersion 14
+        targetSdkVersion 28
+        versionCode rootProject.ext.version
+        versionName "${rootProject.ext.version}"
+
+        testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
+
+    }
+
+    buildTypes {
+        release {
+            minifyEnabled false
+            proguardFiles getDefaultProguardFile('proguard-android-optimize.txt'), 'proguard-rules.pro'
+        }
+    }
+
+    packageBuildConfig false
+}
+
+dependencies {
+    implementation fileTree(dir: 'libs', include: ['*.jar'])
+    testImplementation 'junit:junit:4.12'
+    androidTestImplementation 'com.android.support.test:runner:1.0.2'
+    androidTestImplementation 'com.android.support.test.espresso:espresso-core:3.0.2'
+    implementation 'androidx.documentfile:documentfile:1.0.1'
+    compileOnly 'androidx.annotation:annotation:1.0.2'
+}
+
+
+apply plugin: 'maven'
+group = "moe.yuuta.ohmysaf"
+version = rootProject.ext.version
+uploadArchives {
+    repositories {
+        mavenDeployer {
+            repository(url: uri('../repo'))
+        }
+    }
+}
\ No newline at end of file
diff --git a/ohmysaf/proguard-rules.pro b/ohmysaf/proguard-rules.pro
new file mode 100644
index 0000000..f1b4245
--- /dev/null
+++ b/ohmysaf/proguard-rules.pro
@@ -0,0 +1,21 @@
+# Add project specific ProGuard rules here.
+# You can control the set of applied configuration files using the
+# proguardFiles setting in build.gradle.
+#
+# For more details, see
+#   http://developer.android.com/guide/developing/tools/proguard.html
+
+# If your project uses WebView with JS, uncomment the following
+# and specify the fully qualified class name to the JavaScript interface
+# class:
+#-keepclassmembers class fqcn.of.javascript.interface.for.webview {
+#   public *;
+#}
+
+# Uncomment this to preserve the line number information for
+# debugging stack traces.
+#-keepattributes SourceFile,LineNumberTable
+
+# If you keep the line number information, uncomment this to
+# hide the original source file name.
+#-renamesourcefileattribute SourceFile
diff --git a/ohmysaf/src/androidTest/java/moe/yuuta/ohmysaf/ExampleInstrumentedTest.java b/ohmysaf/src/androidTest/java/moe/yuuta/ohmysaf/ExampleInstrumentedTest.java
new file mode 100644
index 0000000..e9ae8f8
--- /dev/null
+++ b/ohmysaf/src/androidTest/java/moe/yuuta/ohmysaf/ExampleInstrumentedTest.java
@@ -0,0 +1,26 @@
+package moe.yuuta.ohmysaf;
+
+import android.content.Context;
+import android.support.test.InstrumentationRegistry;
+import android.support.test.runner.AndroidJUnit4;
+
+import org.junit.Test;
+import org.junit.runner.RunWith;
+
+import static org.junit.Assert.assertEquals;
+
+/**
+ * Instrumented test, which will execute on an Android device.
+ *
+ * @see <a href="http://d.android.com/tools/testing">Testing documentation</a>
+ */
+@RunWith(AndroidJUnit4.class)
+public class ExampleInstrumentedTest {
+    @Test
+    public void useAppContext() {
+        // Context of the app under test.
+        Context appContext = InstrumentationRegistry.getInstrumentation().getTargetContext();
+
+        assertEquals("moe.yuuta.ohmysaf.test", appContext.getPackageName());
+    }
+}
diff --git a/ohmysaf/src/main/AndroidManifest.xml b/ohmysaf/src/main/AndroidManifest.xml
new file mode 100644
index 0000000..8067758
--- /dev/null
+++ b/ohmysaf/src/main/AndroidManifest.xml
@@ -0,0 +1 @@
+<manifest package="moe.yuuta.ohmysaf" />
diff --git a/ohmysaf/src/main/java/moe/yuuta/ohmysaf/OhMySAF.java b/ohmysaf/src/main/java/moe/yuuta/ohmysaf/OhMySAF.java
new file mode 100644
index 0000000..94175ae
--- /dev/null
+++ b/ohmysaf/src/main/java/moe/yuuta/ohmysaf/OhMySAF.java
@@ -0,0 +1,26 @@
+package moe.yuuta.ohmysaf;
+
+import android.content.Context;
+import android.net.Uri;
+
+import androidx.annotation.NonNull;
+import androidx.annotation.Nullable;
+import androidx.documentfile.provider.DocumentFile;
+
+public class OhMySAF {
+    @Nullable
+    public static SafFile ohMyTree(@NonNull Context context, @NonNull Uri uri) {
+        return ohMyDocument(DocumentFile.fromTreeUri(context, uri));
+    }
+
+    @Nullable
+    public static SafFile ohMyFile(@NonNull Context context, @NonNull Uri uri) {
+        return ohMyDocument(DocumentFile.fromSingleUri(context, uri));
+    }
+
+    @Nullable
+    public static SafFile ohMyDocument(@Nullable DocumentFile file) {
+        if (file == null) return null;
+        return new SafFile(file);
+    }
+}
diff --git a/ohmysaf/src/main/java/moe/yuuta/ohmysaf/SafFile.java b/ohmysaf/src/main/java/moe/yuuta/ohmysaf/SafFile.java
new file mode 100644
index 0000000..3aaee77
--- /dev/null
+++ b/ohmysaf/src/main/java/moe/yuuta/ohmysaf/SafFile.java
@@ -0,0 +1,345 @@
+package moe.yuuta.ohmysaf;
+
+import android.net.Uri;
+
+import androidx.annotation.NonNull;
+import androidx.annotation.Nullable;
+import androidx.annotation.RestrictTo;
+import androidx.documentfile.provider.DocumentFile;
+
+import java.io.File;
+import java.io.FileFilter;
+import java.io.FilenameFilter;
+import java.io.IOException;
+import java.net.MalformedURLException;
+import java.net.URI;
+import java.net.URL;
+import java.nio.file.Path;
+import java.util.ArrayList;
+import java.util.List;
+
+public class SafFile extends File {
+    private final DocumentFile mOrig;
+
+    public SafFile(String pathname) {
+        super(pathname);
+        throw new UnsupportedOperationException("The Java constructor is not supported in SafFile");
+    }
+
+    public SafFile(String parent, String child) {
+        super(parent, child);
+        throw new UnsupportedOperationException("The Java constructor is not supported in SafFile");
+    }
+
+    public SafFile(File parent, String child) {
+        super(parent, child);
+        throw new UnsupportedOperationException("The Java constructor is not supported in SafFile");
+    }
+
+    public SafFile(URI uri) {
+        super(uri);
+        throw new UnsupportedOperationException("The Java constructor is not supported in SafFile");
+    }
+
+    @RestrictTo(RestrictTo.Scope.LIBRARY)
+    SafFile(@NonNull DocumentFile orig) {
+        super(orig.getUri().getPath());
+        mOrig = orig;
+    }
+
+    @Override
+    public String getName() {
+        return mOrig.getName();
+    }
+
+    @Nullable
+    @Override
+    public String getParent() {
+        final File parent = getParentFile();
+        if (parent == null) return null;
+        return parent.getAbsolutePath();
+    }
+
+    @Nullable
+    @Override
+    public File getParentFile() {
+        if (mOrig.getParentFile() == null) return null;
+        return new SafFile(mOrig.getParentFile());
+    }
+
+    @Override
+    public String getPath() {
+        return mOrig.getUri().getPath();
+    }
+
+    @Override
+    public boolean isAbsolute() {
+        return mOrig.getUri().isAbsolute();
+    }
+
+    @Override
+    public String getAbsolutePath() {
+        // TODO: Incorrect?
+        return mOrig.getUri().getPath();
+    }
+
+    @Override
+    public URI toURI() {
+        return URI.create(mOrig.getUri().toString());
+    }
+
+    @Override
+    public boolean canRead() {
+        return mOrig.canRead();
+    }
+
+    @Override
+    public boolean canWrite() {
+        return mOrig.canWrite();
+    }
+
+    @Override
+    public boolean exists() {
+        return mOrig.exists();
+    }
+
+    @Override
+    public boolean isDirectory() {
+        return mOrig.isDirectory();
+    }
+
+    @Override
+    public boolean isFile() {
+        return mOrig.isFile();
+    }
+
+    @Override
+    public boolean isHidden() {
+        // TODO
+        return getName().startsWith(".");
+    }
+
+    @Override
+    public long lastModified() {
+        return mOrig.lastModified();
+    }
+
+    @Override
+    public long length() {
+        return mOrig.length();
+    }
+
+    @Override
+    public boolean createNewFile() throws IOException {
+        // This should never be called.
+        return true;
+    }
+
+    @Override
+    public boolean delete() {
+        return mOrig.delete();
+    }
+
+    @Override
+    public String[] list() {
+        return list(null);
+    }
+
+    @Override
+    public String[] list(FilenameFilter filter) {
+        File[] files = listFiles();
+        List<String> names = new ArrayList<>(files.length);
+        for (File file : files) {
+            if (filter != null && !filter.accept(file.getParentFile(), file.getName())) continue;
+            names.add(file.getName());
+        }
+        return names.toArray(new String[]{});
+    }
+
+    @Override
+    public File[] listFiles() {
+        return listFiles((FilenameFilter) null);
+    }
+
+    @Override
+    public File[] listFiles(@Nullable FilenameFilter filter) {
+        DocumentFile[] origFiles = mOrig.listFiles();
+        if (origFiles.length <= 0) return new File[0];
+        List<File> files = new ArrayList<>(origFiles.length);
+        for (DocumentFile file : origFiles) {
+            final DocumentFile parent = file.getParentFile();
+            if (filter != null && !filter.accept(parent == null ? null : new SafFile(parent),
+                    file.getName())) {
+                continue;
+            }
+            files.add(new SafFile(file));
+        }
+        return files.toArray(new File[]{});
+    }
+
+    @Override
+    public File[] listFiles(FileFilter filter) {
+        DocumentFile[] origFiles = mOrig.listFiles();
+        if (origFiles.length <= 0) return new File[0];
+        List<File> files = new ArrayList<>(origFiles.length);
+        for (DocumentFile file : origFiles) {
+            final File f = new SafFile(file);
+            if (filter != null && !filter.accept(f)) {
+                continue;
+            }
+            files.add(f);
+        }
+        return files.toArray(new File[]{});
+    }
+
+    @Override
+    public boolean mkdir() {
+        // This should never be called because the file will only be gotten if this direction is exists.
+        return true;
+    }
+
+    @Override
+    public boolean mkdirs() {
+        // This should never be called because the file will only be gotten if this direction is exists.
+        return true;
+    }
+
+    @NonNull
+    @Override
+    public String toString() {
+        return mOrig.getUri().toString();
+    }
+
+    @Override
+    public Path toPath() {
+        return super.toPath();
+    }
+
+    @Override
+    public boolean renameTo(File dest) {
+        return mOrig.renameTo(dest.getName());
+    }
+
+    @Nullable
+    public SafFile createChildFile(@NonNull String mimeType, @NonNull String displayName) {
+        final DocumentFile file = mOrig.createFile(mimeType, displayName);
+        if (file == null) return null;
+        return new SafFile(file);
+    }
+
+    @Nullable
+    public SafFile createChildDirectory(@NonNull String displayName) {
+        final DocumentFile file = mOrig.createDirectory(displayName);
+        if (file == null) return null;
+        return new SafFile(file);
+    }
+
+    @Nullable
+    public String getType() {
+        return mOrig.getType();
+    }
+
+    @Nullable
+    public SafFile findFile(@NonNull String displayName) {
+        final DocumentFile file = mOrig.findFile(displayName);
+        if (file == null) return null;
+        return new SafFile(file);
+    }
+
+    @Override
+    public File getAbsoluteFile() {
+        return super.getAbsoluteFile();
+    }
+
+    @Override
+    public boolean setLastModified(long time) {
+        throw new UnsupportedOperationException();
+    }
+
+    @Override
+    public boolean setReadOnly() {
+        throw new UnsupportedOperationException();
+    }
+
+    @Override
+    public boolean setWritable(boolean writable, boolean ownerOnly) {
+        throw new UnsupportedOperationException();
+    }
+
+    @Override
+    public boolean setWritable(boolean writable) {
+        throw new UnsupportedOperationException();
+    }
+
+    @Override
+    public boolean setReadable(boolean readable, boolean ownerOnly) {
+        throw new UnsupportedOperationException();
+    }
+
+    @Override
+    public boolean setReadable(boolean readable) {
+        throw new UnsupportedOperationException();
+    }
+
+    @Override
+    public boolean setExecutable(boolean executable, boolean ownerOnly) {
+        throw new UnsupportedOperationException();
+    }
+
+    @Override
+    public boolean setExecutable(boolean executable) {
+        throw new UnsupportedOperationException();
+    }
+
+    @NonNull
+    public Uri getAndroidUri() {
+        return mOrig.getUri();
+    }
+
+    @Override
+    public boolean canExecute() {
+        // TODO
+        return false;
+    }
+
+    @Override
+    public String getCanonicalPath() throws IOException {
+        // TODO
+        throw new UnsupportedOperationException();
+    }
+
+    @Override
+    public File getCanonicalFile() throws IOException {
+        // TODO
+        throw new UnsupportedOperationException();
+    }
+
+    @Override
+    public long getUsableSpace() {
+        // TODO
+        throw new UnsupportedOperationException();
+    }
+
+    @Override
+    public void deleteOnExit() {
+        // TODO
+        throw new UnsupportedOperationException();
+    }
+
+    @Override
+    public long getTotalSpace() {
+        // TODO
+        throw new UnsupportedOperationException();
+    }
+
+    @Override
+    public long getFreeSpace() {
+        // TODO
+        throw new UnsupportedOperationException();
+    }
+
+    @Override
+    public URL toURL() throws MalformedURLException {
+        return new URL(mOrig.getUri().toString());
+    }
+}
diff --git a/ohmysaf/src/test/java/moe/yuuta/ohmysaf/ExampleUnitTest.java b/ohmysaf/src/test/java/moe/yuuta/ohmysaf/ExampleUnitTest.java
new file mode 100644
index 0000000..591ee89
--- /dev/null
+++ b/ohmysaf/src/test/java/moe/yuuta/ohmysaf/ExampleUnitTest.java
@@ -0,0 +1,17 @@
+package moe.yuuta.ohmysaf;
+
+import org.junit.Test;
+
+import static org.junit.Assert.assertEquals;
+
+/**
+ * Example local unit test, which will execute on the development machine (host).
+ *
+ * @see <a href="http://d.android.com/tools/testing">Testing documentation</a>
+ */
+public class ExampleUnitTest {
+    @Test
+    public void addition_isCorrect() {
+        assertEquals(4, 2 + 2);
+    }
+}
\ No newline at end of file
diff --git a/settings.gradle b/settings.gradle
new file mode 100644
index 0000000..e252cb0
--- /dev/null
+++ b/settings.gradle
@@ -0,0 +1 @@
+include ':app', ':ohmysaf'