java - 单击时更改通知按钮图标

Question

我为我的通知做了一个自定义布局，它有两个按钮，一个用于播放，一个用于暂停音乐。当我单击每个按钮时，会向相应的类(class)发送广播。



现在我只想保留一个按钮并(切换)当用户点击按钮从播放到暂停时更改按钮的图标，反之亦然，我尝试了几件事 更改图标 (我真正的问题)但到目前为止失败了。

在 PlayerActivity.java 中，我通过调用此行来显示通知。

NotificationGenerator.customBigNotification(getApplicationContext());

这是 NotifcationGenerator 的代码:

package com.example.user.musicplayer;

import android.app.NotificationChannel;
import android.app.NotificationManager;
import android.app.PendingIntent;
import android.content.Context;
import android.content.Intent;
import android.graphics.Color;
import android.support.v4.app.NotificationCompat;
import android.widget.RemoteViews;

public class NotificationGenerator {
    private static final int NOTIFICATION_ID_OPEN_ACTIVITY = 1;
    private static final int NOTIFICATION_ID_CUSTOM_BIG = 1;

    public static void customBigNotification(Context context){
        RemoteViews expandedView = new RemoteViews(context.getPackageName(), R.layout.big_notification);
        NotificationCompat.Builder nc = new NotificationCompat.Builder(context);
        NotificationManager nm = (NotificationManager) context.getSystemService(Context.NOTIFICATION_SERVICE);
        Intent notifyIntent = new Intent(context, PlayerActivity.class);
        notifyIntent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
        notifyIntent.addFlags(Intent.FLAG_ACTIVITY_SINGLE_TOP);
        PendingIntent pendingIntent = PendingIntent.getActivity(context, 0, notifyIntent, PendingIntent.FLAG_UPDATE_CURRENT);


        String id = "mymusicplayer";
        CharSequence name = "player";
        String description = "player";
        int importance = NotificationManager.IMPORTANCE_LOW;

        NotificationChannel mChannel = null;
        if (android.os.Build.VERSION.SDK_INT >= android.os.Build.VERSION_CODES.O) {
            mChannel = new NotificationChannel(id, name, importance);
            mChannel.setDescription(description);

            mChannel.enableLights(true);
            mChannel.setLightColor(Color.RED);

            mChannel.enableVibration(true);
            mChannel.setVibrationPattern(new long[]{100, 200, 300, 400, 500, 400, 300, 200, 400});

            nm.createNotificationChannel(mChannel);
        }



        nc.setContentIntent(pendingIntent);
        nc.setSmallIcon(R.drawable.ic_action_play);
        nc.setAutoCancel(true);
        nc.setCustomBigContentView(expandedView);
        nc.setContentTitle("Music Player");
        nc.setContentText("Control Audio");
        nc.getBigContentView().setTextViewText(R.id.textSongName, "Lorem Ipsum Dolor");

        setRemoteViews(expandedView, context);
        nm.notify(NOTIFICATION_ID_CUSTOM_BIG, nc.setChannelId(id).build());
    }

    private static void setRemoteViews(RemoteViews remoteViews, Context c) {

        // call broadcast when any control of notification is clicked.
        Intent playIntent = new Intent(c, PlayBroadcast.class);

        PendingIntent playPendingIntent = PendingIntent.getBroadcast(c, 0, playIntent, 0);

        // Using RemoteViews to bind custom layouts into Notification
        remoteViews.setOnClickPendingIntent(R.id.btnPlay, playPendingIntent);

        // call broadcast when any control of notification is clicked.
        Intent pauseIntent = new Intent(c, PauseBroadcast.class);

        PendingIntent pausePendingIntent = PendingIntent.getBroadcast(c, 0, pauseIntent, 0);

        // Using RemoteViews to bind custom layouts into Notification
        remoteViews.setOnClickPendingIntent(R.id.btnPause, pausePendingIntent);
    }

}

这是 PlayBroadCast.java 的代码:(从播放按钮接收广播的地方):

package com.example.user.musicplayer;

import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.media.MediaPlayer;

public class PlayBroadcast extends BroadcastReceiver {
    @Override
    public void onReceive(Context context, Intent intent) {
        MediaPlayer mP = PlayerActivity.mediaPlayer;
        if(!mP.isPlaying()){
            mP.start();

        }
    }
}

如果解释不清楚，请原谅我，因为如果我可能有正确的话来解释它。我会用谷歌搜索它。提前致谢。

Answer 1

尝试这个:

expandedLayout.setInt(R.id.notif_button_play, "setImageResource", R.drawable.ic_play)

在我的情况下， View 是 ImageButton，所以我通过“setImageResource”更改了图标。您可以设置 View 的函数名称。