[quick_actions] Implementing sharedpreferences approach for killed apps

packages/quick_actions/CHANGELOG.md

@@ -1,3 +1,7 @@
+## 0.3.2
+
+* Fixing the quick actions launch on Android when the app is killed. 
+
 ## 0.3.1
 
 * Added unit tests.

packages/quick_actions/android/src/main/AndroidManifest.xml

@@ -1,7 +1,12 @@
 <manifest xmlns:android="http://schemas.android.com/apk/res/android"
-  package="io.flutter.plugins.quickactions">
+    xmlns:tools="http://schemas.android.com/tools"
+    package="io.flutter.plugins.quickactions">
 
-  <application>
-    <activity android:name=".QuickActionsPlugin$ShortcutHandlerActivity" android:exported="false"/>
-  </application>
+    <application>
+        <activity
+            android:name=".QuickActionsPlugin$ShortcutHandlerActivity"
+            android:exported="false"
+            android:relinquishTaskIdentity="true"
+            tools:targetApi="lollipop" />
+    </application>
 </manifest>

packages/quick_actions/android/src/main/java/io/flutter/plugins/quickactions/QuickActionsPlugin.java

@@ -8,6 +8,7 @@
 import android.app.Activity;
 import android.content.Context;
 import android.content.Intent;
+import android.content.SharedPreferences;
 import android.content.pm.ShortcutInfo;
 import android.content.pm.ShortcutManager;
 import android.graphics.drawable.Icon;
@@ -109,6 +110,10 @@ private List<ShortcutInfo> deserializeShortcuts(List<Map<String, String>> shortc
    */
   public static class ShortcutHandlerActivity extends Activity {
 
+    private final String sharedPreferencesName = "FlutterSharedPreferences";
+    private final String sharedPreferencesKeyPrefix = "flutter.";
+    private final String sharedPreferencesActionKey = "action";
+
     @Override
     protected void onCreate(Bundle savedInstanceState) {
       super.onCreate(savedInstanceState);
@@ -117,8 +122,31 @@ protected void onCreate(Bundle savedInstanceState) {
       String type = intent.getStringExtra("type");
       if (channel != null) {
         channel.invokeMethod("launch", type);
+      } else {
+        setActionToSharedPreferences(type);
+        startActivity(getIntentToOpenMainActivity(this));
       }
       finish();
     }
+
+    /**
+     * Returns Intent to launch the MainActivity. Used to start the app, if one of quick actions was
+     * called from the background.
+     */
+    private Intent getIntentToOpenMainActivity(Context context) {
+      return context
+          .getPackageManager()
+          .getLaunchIntentForPackage(context.getApplicationContext().getPackageName());
+    }
+
+    /**
+     * Saving action name to shared preferences to run requested quick action later, after app
+     * launch
+     */
+    private void setActionToSharedPreferences(String type) {
+      SharedPreferences prefs =
+          this.getSharedPreferences(sharedPreferencesName, Context.MODE_PRIVATE);
+      prefs.edit().putString(sharedPreferencesKeyPrefix + sharedPreferencesActionKey, type).apply();
+    }
   }
 }

packages/quick_actions/lib/quick_actions.dart

@@ -6,10 +6,13 @@ import 'dart:async';
 
 import 'package:flutter/services.dart';
 import 'package:meta/meta.dart';
+import 'package:shared_preferences/shared_preferences.dart';
 
 const MethodChannel _kChannel =
     MethodChannel('plugins.flutter.io/quick_actions');
 
+const String _actionSharedPrefsKey = "action";
+
 /// Handler for a quick action launch event.
 ///
 /// The argument [type] corresponds to the [ShortcutItem]'s field.
@@ -49,11 +52,27 @@ class QuickActions {
   /// Initializes this plugin.
   ///
   /// Call this once before any further interaction with the the plugin.
-  void initialize(QuickActionHandler handler) {
+  void initialize(QuickActionHandler handler) async {
     channel.setMethodCallHandler((MethodCall call) async {
       assert(call.method == 'launch');
       handler(call.arguments);
     });
+
+    final String action = await _getActionFromSharedPreferences();
+    if (action != null) {
+      handler(action);
+      _removeActionFromSharedPreferences();
+    }
+  }
+
+  Future<String> _getActionFromSharedPreferences() async {
+    final SharedPreferences prefs = await SharedPreferences.getInstance();
+    return prefs.getString(_actionSharedPrefsKey);
+  }
+
+  Future<void> _removeActionFromSharedPreferences() async {
+    final SharedPreferences prefs = await SharedPreferences.getInstance();
+    return prefs.setString(_actionSharedPrefsKey, null);
   }
 
   /// Sets the [ShortcutItem]s to become the app's quick actions.

packages/quick_actions/pubspec.yaml

@@ -3,7 +3,7 @@ description: Flutter plugin for creating shortcuts on home screen, also known as
   Quick Actions on iOS and App Shortcuts on Android.
 author: Flutter Team <flutter-dev@googlegroups.com>
 homepage: https://github.com/flutter/plugins/tree/master/packages/quick_actions
-version: 0.3.1
+version: 0.3.2
 
 flutter:
   plugin:
@@ -15,6 +15,7 @@ dependencies:
   flutter:
     sdk: flutter
   meta: ^1.0.5
+  shared_preferences: ^0.5.3+1
 
 dev_dependencies:
   test: ^1.3.0