Rename top level directories

mobile/android/.gitignore

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+gradle-wrapper.jar
+/.gradle
+/gradle
+/captures/
+/gradlew
+/gradlew.bat
+/local.properties
+GeneratedPluginRegistrant.java

mobile/android/app/build.gradle

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+def localProperties = new Properties()
+def localPropertiesFile = rootProject.file('local.properties')
+if (localPropertiesFile.exists()) {
+    localPropertiesFile.withReader('UTF-8') { reader ->
+        localProperties.load(reader)
+    }
+}
+
+def flutterRoot = localProperties.getProperty('flutter.sdk')
+if (flutterRoot == null) {
+    throw new GradleException("Flutter SDK not found. Define location with flutter.sdk in the local.properties file.")
+}
+
+def flutterVersionCode = localProperties.getProperty('flutter.versionCode')
+if (flutterVersionCode == null) {
+    flutterVersionCode = '1'
+}
+
+def flutterVersionName = localProperties.getProperty('flutter.versionName')
+if (flutterVersionName == null) {
+    flutterVersionName = '1.0'
+}
+
+apply plugin: 'com.android.application'
+apply plugin: 'kotlin-android'
+apply from: "$flutterRoot/packages/flutter_tools/gradle/flutter.gradle"
+
+android {
+    compileSdkVersion 29
+
+    sourceSets {
+        main.java.srcDirs += 'src/main/kotlin'
+    }
+
+    lintOptions {
+        disable 'InvalidPackage'
+    }
+
+    defaultConfig {
+        applicationId "de.johrpan.musicus"
+        minSdkVersion 21
+        targetSdkVersion 29
+        versionCode flutterVersionCode.toInteger()
+        versionName flutterVersionName
+        testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner"
+    }
+
+    buildTypes {
+        release {
+            // TODO: Add your own signing config for the release build.
+            // Signing with the debug keys for now, so `flutter run --release` works.
+            signingConfig signingConfigs.debug
+            // See https://github.com/ryanheise/audio_service/blob/master/README.md#android-setup
+            shrinkResources false
+        }
+    }
+}
+
+flutter {
+    source '../..'
+}
+
+dependencies {
+    implementation "org.jetbrains.kotlin:kotlin-stdlib-jdk7:$kotlin_version"
+    testImplementation 'junit:junit:4.12'
+    androidTestImplementation 'androidx.test:runner:1.1.1'
+    androidTestImplementation 'androidx.test.espresso:espresso-core:3.1.1'
+}

mobile/android/app/src/debug/AndroidManifest.xml

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+<manifest xmlns:android="http://schemas.android.com/apk/res/android"
+    package="de.johrpan.musicus">
+    <!-- Flutter needs it to communicate with the running application
+         to allow setting breakpoints, to provide hot reload, etc.
+    -->
+    <uses-permission android:name="android.permission.INTERNET"/>
+</manifest>

mobile/android/app/src/main/AndroidManifest.xml

@@ -0,0 +1,43 @@
+<manifest xmlns:android="http://schemas.android.com/apk/res/android"
+    package="de.johrpan.musicus">
+
+    <uses-permission android:name="android.permission.FOREGROUND_SERVICE" />
+    <uses-permission android:name="android.permission.WAKE_LOCK" />
+
+    <application
+        android:name="io.flutter.app.FlutterApplication"
+        android:label="Musicus"
+        android:icon="@mipmap/ic_launcher"
+        android:roundIcon="@mipmap/ic_launcher_round">
+
+        <activity
+            android:name=".MainActivity"
+            android:launchMode="singleTop"
+            android:theme="@style/LaunchTheme"
+            android:configChanges="orientation|keyboardHidden|keyboard|screenSize|smallestScreenSize|locale|layoutDirection|fontScale|screenLayout|density|uiMode"
+            android:hardwareAccelerated="true"
+            android:windowSoftInputMode="adjustResize">
+
+            <intent-filter>
+                <action android:name="android.intent.action.MAIN" />
+                <category android:name="android.intent.category.LAUNCHER" />
+            </intent-filter>
+        </activity>
+
+        <service android:name="com.ryanheise.audioservice.AudioService">
+            <intent-filter>
+               <action android:name="android.media.browse.MediaBrowserService" />
+            </intent-filter>
+        </service>
+
+        <receiver android:name="androidx.media.session.MediaButtonReceiver" >
+            <intent-filter>
+               <action android:name="android.intent.action.MEDIA_BUTTON" />
+            </intent-filter>
+        </receiver>
+
+        <meta-data
+            android:name="flutterEmbedding"
+            android:value="2" />
+    </application>
+</manifest>

mobile/android/app/src/main/kotlin/de/johrpan/musicus/MainActivity.kt

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+package de.johrpan.musicus
+
+import android.app.Activity
+import android.content.Intent
+import android.net.Uri
+import android.provider.DocumentsContract
+import androidx.annotation.NonNull
+import io.flutter.embedding.android.FlutterActivity
+import io.flutter.embedding.engine.FlutterEngine
+import io.flutter.plugin.common.MethodChannel
+import io.flutter.plugins.GeneratedPluginRegistrant
+
+class Document(private val id: String, private val name: String, private val parentId: String?, private val isDirectory: Boolean) {
+    fun toMap(): Map<String, Any?> {
+        return mapOf(
+                "id" to id,
+                "name" to name,
+                "parentId" to parentId,
+                "isDirectory" to isDirectory
+        )
+    }
+}
+
+class MainActivity : FlutterActivity() {
+    private val CHANNEL = "de.johrpan.musicus/platform"
+    private val AODT_REQUEST = 0
+
+    private var aodtResult: MethodChannel.Result? = null
+
+    override fun configureFlutterEngine(@NonNull flutterEngine: FlutterEngine) {
+        GeneratedPluginRegistrant.registerWith(flutterEngine)
+
+        MethodChannel(flutterEngine.dartExecutor.binaryMessenger, CHANNEL).setMethodCallHandler { call, result ->
+            if (call.method == "openTree") {
+                aodtResult = result
+                // We will get the result within onActivityResult
+                openTree()
+            } else if (call.method == "getChildren") {
+                val treeUri = Uri.parse(call.argument<String>("treeUri"))
+                val parentId = call.argument<String>("parentId")
+                val children = getChildren(treeUri, parentId)
+                result.success(children.map { it.toMap() })
+            } else if (call.method == "readFile") {
+                val treeUri = Uri.parse(call.argument<String>("treeUri"))
+                val id = call.argument<String>("id")!!
+                result.success(readFile(treeUri, id))
+            } else if (call.method == "getUriByName") {
+                val treeUri = Uri.parse(call.argument<String>("treeUri"))
+                val parentId = call.argument<String>("parentId")!!
+                val fileName = call.argument<String>("fileName")!!
+                result.success(getUriByName(treeUri, parentId, fileName).toString())
+            } else if (call.method == "readFileByName") {
+                val treeUri = Uri.parse(call.argument<String>("treeUri"))
+                val parentId = call.argument<String>("parentId")!!
+                val fileName = call.argument<String>("fileName")!!
+                result.success(readFileByName(treeUri, parentId, fileName))
+            } else if (call.method == "writeFileByName") {
+                val treeUri = Uri.parse(call.argument<String>("treeUri"))
+                val parentId = call.argument<String>("parentId")!!
+                val fileName = call.argument<String>("fileName")!!
+                val content = call.argument<String>("content")!!
+                writeFileByName(treeUri, parentId, fileName, content)
+                result.success(null)
+            } else {
+                result.notImplemented()
+            }
+        }
+    }
+
+    override fun onActivityResult(requestCode: Int, resultCode: Int, data: Intent?) {
+        super.onActivityResult(requestCode, resultCode, data)
+
+        if (requestCode == AODT_REQUEST) {
+            if (resultCode == Activity.RESULT_OK && data?.data != null) {
+                // Drop all old URIs
+                contentResolver.persistedUriPermissions.forEach {
+                    contentResolver.releasePersistableUriPermission(it.uri, Intent.FLAG_GRANT_WRITE_URI_PERMISSION)
+                }
+
+                // We already checked for null
+                val uri = data.data!!
+                contentResolver.takePersistableUriPermission(uri, Intent.FLAG_GRANT_WRITE_URI_PERMISSION)
+
+                aodtResult?.success(uri.toString())
+            } else {
+                aodtResult?.success(null)
+            }
+        }
+    }
+
+    /**
+     * Open a document tree using the storage access framework
+     *
+     * The result is handled within [onActivityResult]
+     */
+    private fun openTree() {
+        val intent = Intent(Intent.ACTION_OPEN_DOCUMENT_TREE)
+        intent.addFlags(Intent.FLAG_GRANT_WRITE_URI_PERMISSION)
+        intent.addFlags(Intent.FLAG_GRANT_PERSISTABLE_URI_PERMISSION)
+
+        startActivityForResult(intent, AODT_REQUEST)
+    }
+
+    /**
+     * List children of a directory
+     *
+     * @param treeUri The treeUri from the ACTION_OPEN_DOCUMENT_TREE request
+     * @param parentId Document ID of the parent directory or null for the top level directory
+     * @return List of directories and files within the directory
+     */
+    private fun getChildren(treeUri: Uri, parentId: String?): List<Document> {
+        val realParentId = parentId ?: DocumentsContract.getTreeDocumentId(treeUri)
+        val children = ArrayList<Document>()
+        val childrenUri = DocumentsContract.buildChildDocumentsUriUsingTree(treeUri, realParentId)
+
+        val cursor = contentResolver.query(
+                childrenUri,
+                arrayOf(DocumentsContract.Document.COLUMN_DOCUMENT_ID,
+                        DocumentsContract.Document.COLUMN_DISPLAY_NAME,
+                        DocumentsContract.Document.COLUMN_MIME_TYPE),
+                null, null, null)
+
+        if (cursor != null) {
+            while (cursor.moveToNext()) {
+                val id = cursor.getString(0)
+                val name = cursor.getString(1)
+                val isDirectory = cursor.getString(2) == DocumentsContract.Document.MIME_TYPE_DIR
+
+                // Use parentId here to let the consumer know that we are at the top level.
+                children.add(Document(id, name, parentId, isDirectory))
+            }
+
+            cursor.close()
+        }
+
+        return children
+    }
+
+    /**
+     * Look for a file by name
+     *
+     * @param treeUri The treeUri from the ACTION_OPEN_DOCUMENT_TREE request
+     * @param parentId The directory in which the file is searched for
+     * @param fileName Name of the file
+     * @return The URI of the file or null
+     */
+    private fun getUriByName(treeUri: Uri, parentId: String, fileName: String): Uri? {
+        var uri: Uri? = null
+
+        val childrenUri = DocumentsContract.buildChildDocumentsUriUsingTree(treeUri, parentId)
+        val projection = arrayOf(DocumentsContract.Document.COLUMN_DOCUMENT_ID, DocumentsContract.Document.COLUMN_DISPLAY_NAME)
+        
+        // The file system provider doesn't support a select clause.
+        val cursor = contentResolver.query(childrenUri, projection, null, null, null)
+
+        if (cursor != null) {
+            while (cursor.moveToNext()) {
+                val id = cursor.getString(0)
+                val name = cursor.getString(1)
+
+                if (name == fileName) {
+                    uri = DocumentsContract.buildDocumentUriUsingTree(treeUri, id)
+                    break
+                }
+            }
+
+            cursor.close()
+        }
+
+        return uri
+    }
+
+    /**
+     * Read content of a file
+     *
+     * @param treeUri The URI from ACTION_OPEN_DOCUMENT_TREE
+     * @param id The document ID of the file
+     * @return File content or null
+     */
+    private fun readFile(treeUri: Uri, id: String): String? {
+        val uri = DocumentsContract.buildDocumentUriUsingTree(treeUri, id)
+
+        // TODO: Handle errors.
+        val input = contentResolver.openInputStream(uri)!!
+        val result = input.reader().readText()
+        input.close()
+
+        return result
+    }
+
+    /**
+     * Read content of a file by name
+     *
+     * @param treeUri The URI from ACTION_OPEN_DOCUMENT_TREE
+     * @param parentId Document ID of the parent directory
+     * @param fileName Name of the file
+     * @return File content or null
+     */
+    private fun readFileByName(treeUri: Uri, parentId: String, fileName: String): String? {
+        var uri = getUriByName(treeUri, parentId, fileName)
+
+        return if (uri != null) {
+            // TODO: Handle errors.
+            val input = contentResolver.openInputStream(uri)!!
+            val result = input.reader().readText()
+            input.close()
+
+            return result
+        } else {
+            null
+        }
+    }
+
+    /**
+     * Write to file by name
+     * 
+     * The file will always have the MIME type application/json.
+     *
+     * @param treeUri The URI from ACTION_OPEN_DOCUMENT_TREE
+     * @param parentId Document ID of the parent directory
+     * @param fileName Name of the file
+     * @param content Content to write
+     * @return File content or null
+     */
+    private fun writeFileByName(treeUri: Uri, parentId: String, fileName: String, content: String) {
+        var uri = getUriByName(treeUri, parentId, fileName);
+
+        if (uri == null) {
+            val parentUri = DocumentsContract.buildDocumentUriUsingTree(treeUri, parentId)
+            uri = DocumentsContract.createDocument(contentResolver, parentUri, "application/json", fileName)
+        }
+
+        // TODO: Handle errors.
+        val output = contentResolver.openOutputStream(uri!!)!!;
+        val writer = output.writer()
+        writer.write(content)
+        writer.close()
+        output.close()
+    }
+}

mobile/android/app/src/main/res/drawable/ic_launcher_foreground.xml

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+<vector xmlns:android="http://schemas.android.com/apk/res/android"
+    android:width="108dp"
+    android:height="108dp"
+    android:viewportWidth="108"
+    android:viewportHeight="108">
+
+  <path
+      android:pathData="m45.993,37.589c-1.147,6.587 -2.628,14.34 -4.415,23.149 -1.222,-1.066 -2.952,-1.735 -4.877,-1.735 -3.701,0 -6.701,2.462 -6.701,5.498s3,5.498 6.701,5.498 6.101,-1.669 6.701,-5.498c0.858,-6.02 1.602,-10.357 2.94,-18.602h0.195c2.249,4.725 4.562,9.879 6.941,15.456l2.43,-4.965c-2.647,-5.62 -5.452,-11.86 -8.432,-18.802zM68.7,37.589c-4.441,9.091 -9.305,19.012 -13.563,27.716 0.495,1.106 0.494,1.094 1.631,1.863 3.214,-7.358 6.516,-14.404 9.904,-21.137l0.175,0.022c1.149,8.652 1.97,15.734 2.464,21.246 0.451,-0.087 1.185,-0.131 2.203,-0.131 1.207,0 2.036,0.043 2.486,0.131 -1.629,-9.772 -3.023,-19.675 -4.187,-29.709z"
+      android:strokeWidth=".80618"
+      android:fillColor="#ffc107" />
+</vector>

mobile/android/app/src/main/res/mipmap-anydpi-v26/ic_launcher.xml

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+<?xml version="1.0" encoding="UTF-8"?>
+<adaptive-icon xmlns:android="http://schemas.android.com/apk/res/android">
+    <background android:drawable="@color/background" />
+    <foreground android:drawable="@drawable/ic_launcher_foreground" />
+</adaptive-icon>

mobile/android/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="@color/background" />
+    <foreground android:drawable="@drawable/ic_launcher_foreground" />
+</adaptive-icon>

mobile/android/app/src/main/res/values/colors.xml

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+<?xml version="1.0" encoding="UTF-8"?>
+<resources>
+    <color name="background">#303030</color>
+</resources>

mobile/android/app/src/main/res/values/styles.xml

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+<?xml version="1.0" encoding="UTF-8"?>
+<resources>
+    <style name="LaunchTheme" parent="@android:style/Theme.Black.NoTitleBar">
+        <item name="android:windowBackground">@color/background</item>
+    </style>
+</resources>

mobile/android/app/src/profile/AndroidManifest.xml

@@ -0,0 +1,7 @@
+<manifest xmlns:android="http://schemas.android.com/apk/res/android"
+    package="de.johrpan.musicus">
+    <!-- Flutter needs it to communicate with the running application
+         to allow setting breakpoints, to provide hot reload, etc.
+    -->
+    <uses-permission android:name="android.permission.INTERNET"/>
+</manifest>

mobile/android/build.gradle

@@ -0,0 +1,31 @@
+buildscript {
+    ext.kotlin_version = '1.3.50'
+    repositories {
+        google()
+        jcenter()
+    }
+
+    dependencies {
+        classpath 'com.android.tools.build:gradle:3.5.0'
+        classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlin_version"
+    }
+}
+
+allprojects {
+    repositories {
+        google()
+        jcenter()
+    }
+}
+
+rootProject.buildDir = '../build'
+subprojects {
+    project.buildDir = "${rootProject.buildDir}/${project.name}"
+}
+subprojects {
+    project.evaluationDependsOn(':app')
+}
+
+task clean(type: Delete) {
+    delete rootProject.buildDir
+}

mobile/android/gradle.properties

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+org.gradle.jvmargs=-Xmx1536M
+android.enableR8=true
+android.useAndroidX=true
+android.enableJetifier=true

mobile/android/settings.gradle

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+include ':app'
+
+def flutterProjectRoot = rootProject.projectDir.parentFile.toPath()
+
+def plugins = new Properties()
+def pluginsFile = new File(flutterProjectRoot.toFile(), '.flutter-plugins')
+if (pluginsFile.exists()) {
+    pluginsFile.withReader('UTF-8') { reader -> plugins.load(reader) }
+}
+
+plugins.each { name, path ->
+    def pluginDirectory = flutterProjectRoot.resolve(path).resolve('android').toFile()
+    include ":$name"
+    project(":$name").projectDir = pluginDirectory
+}