Android通知：点击按钮开始活动

Question

我想在记录器服务运行时显示通知。用户应该能够在通知中直接暂停或停止记录器。所以我在通知中添加了两个按钮，并实现了一个BroadcastReceiver来处理按钮点击。

它几乎像我想要的那样工作，但有一个问题我无法解决。当用户单击按钮时，我想显示活动。这是我的代码：

private void showNotification() {
    int requestID = (int) System.currentTimeMillis();

    IntentFilter filter = new IntentFilter();
    filter.addAction("STOP_RECORDING");
    filter.addAction("PAUSE_RECORDING");
    filter.addAction("SHOW_ACTIVITY");

    this.broadcastReceiver = new BroadcastReceiver() {
        @Override
        public void onReceive(Context context, Intent intent) {
            switch (intent.getAction()) {
                case "STOP_RECORDING": onStopClick(); break;
                case "PAUSE_RECORDING": onPauseClick(); break;
                case "SHOW_ACTITIVY": break;
                default: Log.i(T, "UNKNOWN ACTION IN NOTIFICATION INTENT");
            }
        }
    };

    Intent stdIntent = new Intent(getApplicationContext(), MyActivityClass.class);
    stdIntent.setFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP | Intent.FLAG_ACTIVITY_SINGLE_TOP | Intent.FLAG_ACTIVITY_REORDER_TO_FRONT);
    PendingIntent pendingIntent = PendingIntent.getActivity(getApplicationContext(), requestID, stdIntent, PendingIntent.FLAG_UPDATE_CURRENT);

    Intent intent1 = new Intent();
    intent1.setAction("STOP_RECORDING");
    PendingIntent stopIntent = PendingIntent.getBroadcast(getApplicationContext(), requestID, intent1, PendingIntent.FLAG_UPDATE_CURRENT);

    Intent intent2 = new Intent();
    intent2.setAction("PAUSE_RECORDING");
    PendingIntent pauseIntent = PendingIntent.getBroadcast(getApplicationContext(), requestID, intent2, PendingIntent.FLAG_UPDATE_CURRENT);



    NotificationCompat.Builder notificationBuilder;

    notificationBuilder = new NotificationCompat.Builder(this);
    // ... configure notification (title, text, icon)
    notificationBuilder.addAction(R.drawable.ic_pause_white_48dp, "Pause", pauseIntent);
    notificationBuilder.addAction(R.drawable.ic_stop_white_48dp, "Stop", stopIntent);

    registerReceiver(this.broadcastReceiver, filter);
    ((NotificationManager) getSystemService(NOTIFICATION_SERVICE)).notify(this.notificationID, notificationBuilder.build());
}

目前执行每个按钮的正确操作，但如果用户单击时应用程序不可见，则不显示该应用程序。如何实现这一点？

有必要在这里实现BroadcastRecencer吗？是否有可能使用getActivity而不是getBroadcast并确定以另一种方式单击了哪个按钮？

Answer 1

好的，我找到了一个更简单、更有效的解决方案。不需要BroadcastRecencer，我只是在我的意图中添加额外的信息并在NewIntent中阅读它们。

我的代码如下所示：

public void onNewIntent(Intent intent) {
    String action = intent.getStringExtra("_ACTION_");

    if(action != null) {
        switch (action) {
            case "STOP_RECORDING": onStopClick(); break;
            case "PAUSE_RECORDING": onPauseClick(); break;
            default: Log.i(T, "UNKNOWN ACTION IN NOTIFICATION INTENT");
        }
    }
}

private void showNotification() {
    int requestID = (int) System.currentTimeMillis();

    Intent stdIntent = new Intent(getApplicationContext(), MyActivity.class);
    stdIntent.putExtra("_ACTION_", "test_dummy_value");
    stdIntent.setFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP | Intent.FLAG_ACTIVITY_SINGLE_TOP | Intent.FLAG_ACTIVITY_REORDER_TO_FRONT);
    PendingIntent pendingIntent = PendingIntent.getActivity(getApplicationContext(), requestID, stdIntent, PendingIntent.FLAG_UPDATE_CURRENT);

    Intent intent1 = new Intent(getApplicationContext(), MyActivity.class);
    intent1.setAction("STOP_RECORDING");
    intent1.putExtra("_ACTION_", "STOP_RECORDING");
    intent1.setFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP | Intent.FLAG_ACTIVITY_SINGLE_TOP | Intent.FLAG_ACTIVITY_REORDER_TO_FRONT);
    PendingIntent stopIntent = PendingIntent.getActivity(getApplicationContext(), requestID, intent1, PendingIntent.FLAG_UPDATE_CURRENT);

    Intent intent2 = new Intent(getApplicationContext(), MyActivity.class);
    intent2.putExtra("_ACTION_", "PAUSE_RECORDING");
    intent2.setAction("PAUSE_RECORDING");
    intent2.setFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP | Intent.FLAG_ACTIVITY_SINGLE_TOP | Intent.FLAG_ACTIVITY_REORDER_TO_FRONT);
    PendingIntent pauseIntent = PendingIntent.getActivity(getApplicationContext(), requestID, intent2, PendingIntent.FLAG_UPDATE_CURRENT);

    NotificationCompat.Builder notificationBuilder;

    notificationBuilder = new NotificationCompat.Builder(this);
    // ... irrelevant code
    notificationBuilder.addAction(R.drawable.ic_pause_white_48dp, "Pause", pauseIntent);
    notificationBuilder.addAction(R.drawable.ic_stop_white_48dp, "Stop", stopIntent);

    ((NotificationManager) getSystemService(NOTIFICATION_SERVICE)).notify(this.notificationID, notificationBuilder.build());
}

有人能告诉我这是实现我目标的最好方式吗？我是Android编程新手，希望正确地学习它：-）