通过通知中的按钮播放上一首/下一首歌曲

Question

我有一个播放器，当用户选择一首歌曲时，播放器会通过 3 个按钮发出通知：上一个、播放、下一个。在后台模式下选择歌曲需要此按钮。但是当我点击这个按钮时，什么都没有发生。这是通知的代码：

Intent intentPrev = new Intent(this, NotificationReceiver.class);

        intentPrev.setAction(ACTION_PREV);

        LocalBroadcastManager.getInstance(this).sendBroadcast(intentPrev);

        PendingIntent pendingIntentPrev = PendingIntent.getActivity(this, 0, intentPrev, PendingIntent.FLAG_UPDATE_CURRENT);

        Intent intentPlay = new Intent(this, NotificationReceiver.class);

        intentPlay.setAction(ACTION_PLAY);

        LocalBroadcastManager.getInstance(this).sendBroadcast(intentPlay);

        PendingIntent pendingIntentPlay = PendingIntent.getActivity(this, 0, intentPlay, PendingIntent.FLAG_UPDATE_CURRENT);

        Intent intentNext = new Intent(this, NotificationReceiver.class);

        intentNext.setAction(ACTION_NEXT);

        LocalBroadcastManager.getInstance(this).sendBroadcast(intentNext);

        PendingIntent pendingIntentNext = PendingIntent.getActivity(this, 0, intentNext, PendingIntent.FLAG_UPDATE_CURRENT);

        NotificationCompat.Builder builder = new NotificationCompat.Builder(this).setSmallIcon(R.drawable.notification).

                setContentTitle(songs.get(songPos).getTitle()).setContentText(songs.get(songPos).getArtist()).

                addAction(R.drawable.previous, "Previous", pendingIntentPrev).addAction(R.drawable.pause, "Pause", pendingIntentPlay).

                addAction(R.drawable.next, "Next", pendingIntentNext);

        Notification notification = builder.build();

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

        notificationManager.notify(1, notification);

这是接收器的代码：

package asus.example.com.player;

import android.content.BroadcastReceiver;

import android.content.Context;

import android.content.Intent;

import java.util.Objects;

当我在调试器中观看时，我看到没有使用 Receiver 类，但我不明白为什么

Answer 1

现在，您正在立即发送带有如下语句的广播：LocalBroadcastManager.getInstance(this).sendBroadcast(intentNext);你说你想Activity稍后开始：PendingIntent pendingIntentNext = PendingIntent.getActivity(this, 0, intentNext, PendingIntent.FLAG_UPDATE_CURRENT);（旁注：这无论如何都行不通，因为在intentNext中，您指定了一个从BroadcastReceivernot from扩展的类Activity）getBroadcast()它不应该是getActivity()：Intent intentNext = new Intent(this, NotificationReceiver.class);intentNext.setAction(ACTION_NEXT);PendingIntent pendingIntentNext = PendingIntent.getBroadcast(this, 0, intentNext, PendingIntent.FLAG_UPDATE_CURRENT);另一件事：您在所有PendingIntents. 您必须对请求代码使用不同的值，因为共享相同请求代码的两个Intents 被认为是相同的Intent，因此您最终会得到所有三个 notificationButton触发相同的操作。