Adds android_using_prebuilt_module to add-to-app samples (flutter#154)

experimental/add_to_app/android_using_prebuilt_module/.gitignore

@@ -0,0 +1,14 @@
+*.iml
+.gradle
+/local.properties
+/.idea/caches
+/.idea/libraries
+/.idea/modules.xml
+/.idea/workspace.xml
+/.idea/navEditor.xml
+/.idea/assetWizardSettings.xml
+.DS_Store
+/build
+/captures
+.externalNativeBuild
+.cxx

experimental/add_to_app/android_using_prebuilt_module/app/.gitignore

@@ -0,0 +1 @@
+/build

experimental/add_to_app/android_using_prebuilt_module/app/build.gradle

@@ -0,0 +1,58 @@
+apply plugin: 'com.android.application'
+
+apply plugin: 'kotlin-android'
+
+apply plugin: 'kotlin-android-extensions'
+
+android {
+    compileSdkVersion 28
+    buildToolsVersion "29.0.2"
+    defaultConfig {
+        applicationId "dev.flutter.example.androidusingprebuiltmodule"
+        minSdkVersion 19
+        targetSdkVersion 28
+        versionCode 1
+        versionName "1.0"
+        testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner"
+    }
+    buildTypes {
+        release {
+            minifyEnabled false
+        }
+    }
+    compileOptions {
+        sourceCompatibility 1.8
+        targetCompatibility 1.8
+    }
+}
+
+repositories {
+    maven {
+        // This maven repo is created when you run `flutter build aar`. It contains compiled code
+        // and resources for flutter_module itself.
+        url '../../flutter_module/build/host/outputs/repo'
+    }
+    maven {
+        // This maven repo contains artifacts for Flutter's Android embedding.
+        url 'http://download.flutter.io'
+    }
+}
+
+dependencies {
+    releaseImplementation ('dev.flutter.example.flutter_module:flutter_release:1.0@aar') {
+        transitive = true
+    }
+
+    debugImplementation ('dev.flutter.example.flutter_module:flutter_debug:1.0@aar') {
+        transitive = true
+    }
+
+    implementation fileTree(dir: 'libs', include: ['*.jar'])
+    implementation "org.jetbrains.kotlin:kotlin-stdlib-jdk7:$kotlin_version"
+    implementation 'androidx.appcompat:appcompat:1.1.0'
+    implementation 'androidx.core:core-ktx:1.1.0'
+    implementation 'androidx.constraintlayout:constraintlayout:1.1.3'
+    testImplementation 'junit:junit:4.12'
+    androidTestImplementation 'androidx.test.ext:junit:1.1.1'
+    androidTestImplementation 'androidx.test.espresso:espresso-core:3.2.0'
+}

experimental/add_to_app/android_using_prebuilt_module/app/src/androidTest/java/dev/flutter/example/androidusingprebuiltmodule/ExampleInstrumentedTest.kt

@@ -0,0 +1,24 @@
+package dev.flutter.example.androidusingprebuiltmodule
+
+import androidx.test.platform.app.InstrumentationRegistry
+import androidx.test.ext.junit.runners.AndroidJUnit4
+
+import org.junit.Test
+import org.junit.runner.RunWith
+
+import org.junit.Assert.*
+
+/**
+ * Instrumented test, which will execute on an Android device.
+ *
+ * See [testing documentation](http://d.android.com/tools/testing).
+ */
+@RunWith(AndroidJUnit4::class)
+class ExampleInstrumentedTest {
+    @Test
+    fun useAppContext() {
+        // Context of the app under test.
+        val appContext = InstrumentationRegistry.getInstrumentation().targetContext
+        assertEquals("dev.flutter.example.androidusingprebuiltmodule", appContext.packageName)
+    }
+}

experimental/add_to_app/android_using_prebuilt_module/app/src/main/AndroidManifest.xml

@@ -0,0 +1,29 @@
+<?xml version="1.0" encoding="utf-8"?>
+<manifest xmlns:android="http://schemas.android.com/apk/res/android"
+    package="dev.flutter.example.androidusingprebuiltmodule">
+
+    <application
+        android:name=".MyApplication"
+        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">
+        <activity android:name=".MainActivity">
+            <intent-filter>
+                <action android:name="android.intent.action.MAIN" />
+
+                <category android:name="android.intent.category.LAUNCHER" />
+            </intent-filter>
+        </activity>
+        <activity
+            android:name="io.flutter.embedding.android.FlutterActivity"
+            android:configChanges="orientation|keyboardHidden|keyboard|screenSize|locale|layoutDirection|fontScale|screenLayout|density"
+            android:hardwareAccelerated="true"
+            android:windowSoftInputMode="adjustResize"
+            android:exported="true"
+            />
+    </application>
+
+</manifest>

experimental/add_to_app/android_using_prebuilt_module/app/src/main/java/dev/flutter/example/androidusingprebuiltmodule/MainActivity.kt

@@ -0,0 +1,37 @@
+// Copyright 2019 The Flutter team. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+package dev.flutter.example.androidusingprebuiltmodule
+
+import android.os.Bundle
+import android.widget.Button
+import android.widget.TextView
+import androidx.appcompat.app.AppCompatActivity
+import io.flutter.embedding.android.FlutterActivity
+
+class MainActivity : AppCompatActivity() {
+    private var counterLabel: TextView? = null
+
+    override fun onCreate(savedInstanceState: Bundle?) {
+        super.onCreate(savedInstanceState)
+        setContentView(R.layout.activity_main)
+
+        counterLabel = findViewById(R.id.counter_label)
+
+        val button = findViewById<Button>(R.id.launch_button)
+
+        button.setOnClickListener {
+            val intent = FlutterActivity
+                .withCachedEngine(ENGINE_ID)
+                .build(this)
+            startActivity(intent)
+        }
+    }
+
+    override fun onResume() {
+        super.onResume()
+        val app = application as MyApplication
+        counterLabel?.text = "Current count: ${app.count}"
+    }
+}

experimental/add_to_app/android_using_prebuilt_module/app/src/main/java/dev/flutter/example/androidusingprebuiltmodule/MyApplication.kt

@@ -0,0 +1,50 @@
+// Copyright 2019 The Flutter team. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+package dev.flutter.example.androidusingprebuiltmodule
+
+import android.app.Application
+import io.flutter.embedding.engine.FlutterEngine
+import io.flutter.embedding.engine.FlutterEngineCache
+import io.flutter.embedding.engine.dart.DartExecutor
+import io.flutter.plugin.common.MethodChannel
+
+const val ENGINE_ID = "1"
+
+class MyApplication : Application() {
+    var count = 0
+
+    private var channel: MethodChannel? = null
+
+    override fun onCreate() {
+        super.onCreate()
+
+        val flutterEngine = FlutterEngine(this)
+        flutterEngine
+            .dartExecutor
+            .executeDartEntrypoint(
+                DartExecutor.DartEntrypoint.createDefault()
+            )
+
+        FlutterEngineCache.getInstance().put(ENGINE_ID, flutterEngine)
+
+        channel = MethodChannel(flutterEngine.dartExecutor, "dev.flutter.example/counter")
+
+        channel?.setMethodCallHandler { call, _ ->
+            when (call.method) {
+                "incrementCounter" -> {
+                    count++
+                    reportCounter()
+                }
+                "requestCounter" -> {
+                    reportCounter()
+                }
+            }
+        }
+    }
+
+    private fun reportCounter() {
+        channel?.invokeMethod("reportCounter", count)
+    }
+}

experimental/add_to_app/android_using_prebuilt_module/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>