点击“删除”后删除通知

Question

我的应用中有一条通知，其中包含以下代码：

@SuppressLint("RestrictedApi")
    void ShowNotification(String title, String text, int color) {

        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
            channelId = getString(R.string.default_notification_channel_id);
            String description = getString(R.string.channel_description);
            NotificationChannel channel = new NotificationChannel(channelId, "MyNew notification", NotificationManager.IMPORTANCE_DEFAULT);
            channel.setDescription(description);
            // Register the channel with the system; you can't change the importance or other notification behaviors after this
            NotificationManager notificationManager = getSystemService(NotificationManager.class);
            notificationManager.createNotificationChannel(channel);
        }
        Intent deleteIntent = new Intent(this, MainActivity.class);
        deleteIntent.setAction(Intent.ACTION_DELETE);
        deleteIntent.putExtra(EXTRA_NOTIFICATION_ID, 0);
        PendingIntent deletePendingIntent = PendingIntent.getService(this, 0, deleteIntent, 0);

        // Create pending intent, mention the Activity which needs to be
        //triggered when user clicks on notification
        PendingIntent contentIntent = PendingIntent.getActivity(this, 0,
                new Intent(this, MainActivity.class), PendingIntent.FLAG_UPDATE_CURRENT);


        NotificationCompat.Builder mNotify = new NotificationCompat.Builder(this, channelId);
        mNotify.setLights(color, 100 , 200);
        mNotify.setSmallIcon(R.drawable.ic_action_name);
        mNotify.setLargeIcon(BitmapFactory. decodeResource (getResources() , R.drawable.ic_action_name)) ;
        mNotify.setContentTitle(title);
        mNotify.setOngoing(true);

        mNotify.setShowWhen(true);
        mNotify.setContentText(text);
        mNotify.setStyle(new NotificationCompat.BigTextStyle().bigText("Much longer text that cannot fit one line..."));
        mNotify.setDefaults(Notification.DEFAULT_SOUND);

        mNotify.addAction(R.mipmap.shield3_foreground, "Delete", deletePendingIntent);
        mNotify.setContentIntent(contentIntent);//Activity which needs to be triggered when user clicks on notification
        NotificationManager mNotificationManager = (NotificationManager) getSystemService(Context.NOTIFICATION_SERVICE);

        int mId = 1001;
        try {
            mNotificationManager.notify(mId, mNotify.build());

        }
        catch (Exception e) { e.printStackTrace(); }
    }

我的通知工作正常，但问题是，当我在通知中单击“删除”时，它不会删除通知。

我明白，我必须在我的代码中使用 cancel()，但不知道如何在此处使用它以及在何处使用此方法。我应该怎么做才能在我的通知中使用“删除”？谢谢。

Answer 1

使用BroadCastReceiver

1. deleteIntent 由BroadCastReceiver.class 设置
2. deletePendingIntent 由PendingIntent.getBroadCast() 设置
3. cancel(id) 或 cancelAll() 在 BroadCastReceiver

更多细节： android codelabs帮你。

更新

在您的代码中，您的deleteIntent 是为MainActivity 而deletePendingIntent 是来自Service，它不匹配。

如果您不想使用Service 或BroadcastReceiver 而只想使用MainActivity，请更改如下代码

Intent deleteIntent = new Intent(context, MainActivity.class);
deleteIntent.setAction(Intent.ACTION_DELETE);
//getService() -> getActivity()
PendingIntent deletePendingIntent = PendingIntent.getActivity(context, 0, deleteIntent, 0);

你需要处理那个动作

//onCreate() in MainActivity
String action = getIntent().getAction();
if (action != null && action.equals(Intent.ACTION_DELETE)) {
    notificationUtil.deleteNotification(this);
    //if you don't want open app
    finish();
}

//...

//in NotificationUtil
void deleteNotification(Context context) {
    NotificationManager mNotificationManager = (NotificationManager) context.getSystemService(Context.NOTIFICATION_SERVICE);
    mNotificationManager.cancel(mId);
}

这是个坏主意

• 更好地使用BroadCastReceiver
• 阅读android codelabs (java)了解更多详情