[Share] Support v2 android embedder.

packages/share/android/build.gradle

@@ -45,3 +45,27 @@ android {
         disable 'InvalidPackage'
     }
 }
+
+afterEvaluate {
+    def containsEmbeddingDependencies = false
+    for (def configuration : configurations.all) {
+        for (def dependency : configuration.dependencies) {
+            if (dependency.group == 'io.flutter' &&
+                dependency.name.startsWith('flutter_embedding') &&
+                dependency.isTransitive())
+            {
+                containsEmbeddingDependencies = true
+                break
+            }
+        }
+    }
+    if (!containsEmbeddingDependencies) {
+        android {
+            dependencies {
+                def lifecycle_version = "2.1.0"
+                api "androidx.lifecycle:lifecycle-common-java8:$lifecycle_version"
+                api "androidx.lifecycle:lifecycle-runtime:$lifecycle_version"
+            }
+        }
+    }
+}

packages/share/android/src/main/java/io/flutter/plugins/share/MethodCallHandler.java

@@ -0,0 +1,35 @@
+// Copyright 2019 The Flutter Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+package io.flutter.plugins.share;
+
+import androidx.annotation.NonNull;
+import io.flutter.plugin.common.MethodCall;
+import io.flutter.plugin.common.MethodChannel;
+import java.util.Map;
+
+/** Handles the method calls for the plugin. */
+class MethodCallHandler implements MethodChannel.MethodCallHandler {
+
+  private Share share;
+
+  /** Constructs the MethodChannelHandler */
+  MethodCallHandler(@NonNull Share share) {
+    this.share = share;
+  }
+
+  @Override
+  public void onMethodCall(MethodCall call, MethodChannel.Result result) {
+    if (call.method.equals("share")) {
+      if (!(call.arguments instanceof Map)) {
+        throw new IllegalArgumentException("Map argument expected");
+      }
+      // Android does not support showing the share sheet at a particular point on screen.
+      share.share((String) call.argument("text"), (String) call.argument("subject"));
+      result.success(null);
+    } else {
+      result.notImplemented();
+    }
+  }
+}

packages/share/android/src/main/java/io/flutter/plugins/share/Share.java

@@ -0,0 +1,51 @@
+// Copyright 2019 The Flutter Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+package io.flutter.plugins.share;
+
+import android.app.Activity;
+import android.content.Intent;
+import androidx.annotation.Nullable;
+
+/** Handles share intent. */
+class Share {
+
+  private Activity activity;
+
+  /**
+   * Constructs a Share object. The {@code activity} is used to start the share intent. It might be
+   * null when constructing the {@link Share} object and set to non-null when an activity is
+   * available using {@link #setActivity(Activity)}.
+   */
+  Share(@Nullable Activity activity) {
+    this.activity = activity;
+  }
+
+  /**
+   * Sets the activity when an activity is available. When the activity becomes unavailable, use
+   * this method to set it to null.
+   */
+  void setActivity(@Nullable Activity activity) {
+    this.activity = activity;
+  }
+
+  void share(String text, String subject) {
+    if (text == null || text.isEmpty()) {
+      throw new IllegalArgumentException("Non-empty text expected");
+    }
+
+    Intent shareIntent = new Intent();
+    shareIntent.setAction(Intent.ACTION_SEND);
+    shareIntent.putExtra(Intent.EXTRA_TEXT, text);
+    shareIntent.putExtra(Intent.EXTRA_SUBJECT, subject);
+    shareIntent.setType("text/plain");
+    Intent chooserIntent = Intent.createChooser(shareIntent, null /* dialog title optional */);
+    if (activity != null) {
+      activity.startActivity(chooserIntent);
+    } else {
+      chooserIntent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
+      activity.startActivity(chooserIntent);
+    }
+  }
+}

packages/share/android/src/main/java/io/flutter/plugins/share/SharePlugin.java

@@ -4,59 +4,63 @@
 
 package io.flutter.plugins.share;
 
-import android.content.Intent;
-import io.flutter.plugin.common.MethodCall;
+import android.app.Activity;
+import io.flutter.embedding.engine.plugins.FlutterPlugin;
+import io.flutter.embedding.engine.plugins.activity.ActivityAware;
+import io.flutter.embedding.engine.plugins.activity.ActivityPluginBinding;
+import io.flutter.plugin.common.BinaryMessenger;
 import io.flutter.plugin.common.MethodChannel;
 import io.flutter.plugin.common.PluginRegistry.Registrar;
-import java.util.Map;
 
 /** Plugin method host for presenting a share sheet via Intent */
-public class SharePlugin implements MethodChannel.MethodCallHandler {
+public class SharePlugin implements FlutterPlugin, ActivityAware {
 
   private static final String CHANNEL = "plugins.flutter.io/share";
+  private MethodCallHandler handler;
+  private Activity activity;
+  private Share share;
+  private MethodChannel methodChannel;
 
   public static void registerWith(Registrar registrar) {
-    MethodChannel channel = new MethodChannel(registrar.messenger(), CHANNEL);
-    SharePlugin instance = new SharePlugin(registrar);
-    channel.setMethodCallHandler(instance);
+    SharePlugin plugin = new SharePlugin();
+    plugin.setUpChannel(registrar.messenger());
   }
 
-  private final Registrar mRegistrar;
+  @Override
+  public void onAttachedToEngine(FlutterPluginBinding binding) {
+    setUpChannel(binding.getFlutterEngine().getDartExecutor());
+  }
+
+  @Override
+  public void onDetachedFromEngine(FlutterPluginBinding binding) {}
 
-  private SharePlugin(Registrar registrar) {
-    this.mRegistrar = registrar;
+  @Override
+  public void onAttachedToActivity(ActivityPluginBinding binding) {
+    activity = binding.getActivity();
+    share.setActivity(activity);
+  }
+
+  @Override
+  public void onDetachedFromActivity() {
+    activity = null;
+    share.setActivity(null);
+    methodChannel.setMethodCallHandler(null);
+  }
+
+  @Override
+  public void onReattachedToActivityForConfigChanges(ActivityPluginBinding binding) {
+    onAttachedToActivity(binding);
   }
 
   @Override
-  public void onMethodCall(MethodCall call, MethodChannel.Result result) {
-    if (call.method.equals("share")) {
-      if (!(call.arguments instanceof Map)) {
-        throw new IllegalArgumentException("Map argument expected");
-      }
-      // Android does not support showing the share sheet at a particular point on screen.
-      share((String) call.argument("text"), (String) call.argument("subject"));
-      result.success(null);
-    } else {
-      result.notImplemented();
-    }
+  public void onDetachedFromActivityForConfigChanges() {
+    onDetachedFromActivity();
   }
 
-  private void share(String text, String subject) {
-    if (text == null || text.isEmpty()) {
-      throw new IllegalArgumentException("Non-empty text expected");
-    }
-
-    Intent shareIntent = new Intent();
-    shareIntent.setAction(Intent.ACTION_SEND);
-    shareIntent.putExtra(Intent.EXTRA_TEXT, text);
-    shareIntent.putExtra(Intent.EXTRA_SUBJECT, subject);
-    shareIntent.setType("text/plain");
-    Intent chooserIntent = Intent.createChooser(shareIntent, null /* dialog title optional */);
-    if (mRegistrar.activity() != null) {
-      mRegistrar.activity().startActivity(chooserIntent);
-    } else {
-      chooserIntent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
-      mRegistrar.context().startActivity(chooserIntent);
-    }
+  private void setUpChannel(BinaryMessenger messenger) {
+    methodChannel = new MethodChannel(messenger, CHANNEL);
+    share = new Share(activity);
+    handler = new MethodCallHandler(share);
+    methodChannel.setMethodCallHandler(handler);
   }
 }

packages/share/example/android/app/src/main/AndroidManifest.xml

@@ -4,12 +4,19 @@
     <uses-permission android:name="android.permission.INTERNET"/>
 
     <application android:name="io.flutter.app.FlutterApplication" android:label="share_example" android:icon="@mipmap/ic_launcher">
-        <activity android:name=".MainActivity"
+        <activity android:name=".EmbeddingV1Activity"
                   android:launchMode="singleTop"
                   android:theme="@android:style/Theme.Black.NoTitleBar"
                   android:configChanges="orientation|keyboardHidden|keyboard|screenSize|locale|layoutDirection"
                   android:hardwareAccelerated="true"
                   android:windowSoftInputMode="adjustResize">
+        </activity>
+        <activity android:name=".MainActivity"
+            android:launchMode="singleTop"
+            android:theme="@android:style/Theme.Black.NoTitleBar"
+            android:configChanges="orientation|keyboardHidden|keyboard|screenSize|locale|layoutDirection"
+            android:hardwareAccelerated="true"
+            android:windowSoftInputMode="adjustResize">
             <intent-filter>
                 <action android:name="android.intent.action.MAIN"/>
                 <category android:name="android.intent.category.LAUNCHER"/>

packages/share/example/android/app/src/main/java/io/flutter/plugins/shareexample/EmbeddingV1Activity.java

@@ -0,0 +1,18 @@
+// Copyright 2017 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+package io.flutter.plugins.shareexample;
+
+import android.os.Bundle;
+import io.flutter.app.FlutterActivity;
+import io.flutter.plugins.GeneratedPluginRegistrant;
+
+public class EmbeddingV1Activity extends FlutterActivity {
+
+  @Override
+  protected void onCreate(Bundle savedInstanceState) {
+    super.onCreate(savedInstanceState);
+    GeneratedPluginRegistrant.registerWith(this);
+  }
+}

packages/share/example/android/app/src/main/java/io/flutter/plugins/shareexample/MainActivity.java

@@ -1,18 +1,18 @@
-// Copyright 2017 The Chromium Authors. All rights reserved.
+// Copyright 2019 The Flutter Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 package io.flutter.plugins.shareexample;
 
-import android.os.Bundle;
-import io.flutter.app.FlutterActivity;
-import io.flutter.plugins.GeneratedPluginRegistrant;
+import io.flutter.embedding.android.FlutterActivity;
+import io.flutter.embedding.engine.FlutterEngine;
+import io.flutter.plugins.share.SharePlugin;
 
 public class MainActivity extends FlutterActivity {
 
   @Override
-  protected void onCreate(Bundle savedInstanceState) {
-    super.onCreate(savedInstanceState);
-    GeneratedPluginRegistrant.registerWith(this);
+  public void configureFlutterEngine(FlutterEngine flutterEngine) {
+    super.configureFlutterEngine(flutterEngine);
+    flutterEngine.getPlugins().add(new SharePlugin());
   }
 }

packages/share/example/android/gradle.properties

@@ -1 +1,4 @@
 org.gradle.jvmargs=-Xmx1536M
+android.enableR8=true
+android.useAndroidX=true
+android.enableJetifier=true