从通知中启动的活动按返回/主页退出应用程序

我有一个从通知启动的活动。我使用 TaskStackBuilder 包含一个后退堆栈，以便当用户点击主页按钮（操作栏标题按钮）或使用后退键时，它将返回到应用程序。但是，它不是以这种方式工作的，而是回击或操作栏标题按钮总是导致应用程序关闭。

就其价值而言，我的项目结构的组织方式使得所有 UI 组件都位于 Android 库 (com.be.commotion) 中，并且外部“包装器”项目使用该库。

以下是我构建通知的方法：

// This is the activity that will be launched when tapping the notification
Intent intentNotification = new Intent(this, NowPlaying.class);
intentNotification.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK | Intent.FLAG_ACTIVITY_CLEAR_TASK);

// Create the back stack so the user can get back to the main activity when pressing the back button
TaskStackBuilder stackBuilder = TaskStackBuilder.create(this);
stackBuilder.addParentStack(NowPlaying.class);
stackBuilder.addNextIntent(intentNotification);
PendingIntent pendingNowPlayingIntent = stackBuilder.getPendingIntent(0, PendingIntent.FLAG_UPDATE_CURRENT);

// Setup the custom notification view
RemoteViews notificationContent = new RemoteViews(getPackageName(), R.layout.notification_now_playing);
....

// Setup the intent that will play/stop music when the stop button is tapped
Intent musicControlIntent = new Intent(this, CommotionMediaPlayer.class);

PendingIntent musicPendingIntent = PendingIntent.getService(this, 0, musicControlIntent, PendingIntent.FLAG_UPDATE_CURRENT);

notificationContent.setOnClickPendingIntent(R.id.ibMediaControl, musicPendingIntent);

// Update the notification with this info
NotificationCompat.Builder builder = new NotificationCompat.Builder(this)
                    .setSmallIcon(R.drawable.ic_launcher)
                    .setContentTitle(song.text)
                    .setContentText(song.artist)
                    .setContentIntent(pendingNowPlayingIntent)
                    .setLargeIcon(artwork)
                    .setContent(notificationContent)
                    .setOngoing(true);

NotificationManager mNotificationManager = (NotificationManager) getSystemService(Context.NOTIFICATION_SERVICE);

// Using the nowPlayingNotificationId allows the notification to be updated with later calls instead of causing a new notification to show up
mNotificationManager.notify(nowPlayingNotificationId, builder.build());

以下是我的 AndroidManifest.xml 中的适用定义（对于包装器项目）：

    <activity android:name="com.be.commotion.ui.StartupActivity"
            android:label="@string/app_name"
            android:noHistory="true"
            android:screenOrientation="portrait"
            android:theme="@android:style/Theme.Holo.NoActionBar" >
        <intent-filter>
            <action android:name="android.intent.action.MAIN" />
            <category android:name="android.intent.category.LAUNCHER" />
            <action android:name="android.intent.action.VIEW" />
            <category android:name="android.intent.category.DEFAULT" />
        </intent-filter>
    </activity>

    <activity android:name="com.be.commotion.ui.NowPlaying"
              android:label="Now Playing"
              android:parentActivityName="com.be.commotion.ui.StartupActivity"
              android:screenOrientation="portrait">

        <meta-data
                android:name="android.support.PARENT_ACTIVITY"
                android:value="com.be.commotion.ui.StartupActivity" />

    </activity>

您可以通过 2 步骤来完成，而无需使用TaskStackBuilder
1/为您的意图设置标志

intent.setFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP|Intent.FLAG_ACTIVITY_NEW_TASK);

2/为您的 PendingIntent 设置标志

pendingIntent = PendingIntent.getActivity(MainActivity.this,0,intent,PendingIntent.FLAG_CANCEL_CURRENT);

这对我有用，祝大家好运