Android自定义通知布局错位问题

近期在项目中需要做一个音乐通知栏，需要自定义通知栏布局，

我在xml中编写如下布局：

创建通知代码如下(兼容高低版本)：

private Notification buildNotification(String title, String name, String icon, Bitmap bitmap) {

     

        int playButtonResId = isPlaying() ? R.mipmap.ic_media_pause : R.mipmap.ic_media_play;

        long mNotificationPostTime = System.currentTimeMillis();

        Intent nowPlayingIntent = new Intent(this, MainActivity.class);
        nowPlayingIntent.putExtra("tab", IJumpConsts.JUMP_TAB_RING);
        nowPlayingIntent.putExtra("from", "PlayService");
        PendingIntent clickIntent = PendingIntent.getActivity(this, 0, nowPlayingIntent, PendingIntent.FLAG_UPDATE_CURRENT);

        Intent playNext = new Intent(this, PlayService.class);
        playNext.putExtra("cmd", CMD_NEXT);
        PendingIntent playNextIntent = PendingIntent.getService(this, CMD_NEXT, playNext, PendingIntent.FLAG_UPDATE_CURRENT);


        Intent playPause = new Intent(this, PlayService.class);
        playPause.putExtra("cmd", CMD_PAUSE);
        PendingIntent playPauseIntent = PendingIntent.getService(this, CMD_PAUSE, playPause, PendingIntent.FLAG_UPDATE_CURRENT);


        Intent playPre = new Intent(this, PlayService.class);
        playPre.putExtra("cmd", CMD_PRE);
        PendingIntent playPreIntent = PendingIntent.getService(this, CMD_PRE, playPre, PendingIntent.FLAG_UPDATE_CURRENT);

        RemoteViews contentView = new RemoteViews(getPackageName(),R.layout.view_music_play_remote_view);

        contentView.setTextViewText(R.id.title,title);
        contentView.setTextViewText(R.id.name,name);
        contentView.setImageViewResource(R.id.play,playButtonResId);
        contentView.setImageViewBitmap(R.id.icon,bitmap);

        contentView.setOnClickPendingIntent(R.id.play,playPauseIntent);
        contentView.setOnClickPendingIntent(R.id.pre,playPreIntent);
        contentView.setOnClickPendingIntent(R.id.next,playNextIntent);

        Notification.Builder builder = null;
        builder = new Notification.Builder(this)
                .setDefaults(NotificationCompat.FLAG_ONLY_ALERT_ONCE)
                .setSmallIcon(R.mipmap.ic_launcher)
                .setContentIntent(clickIntent)
                .setContentTitle(title)
                .setContentText(name)
                .setSound(null)
                .setWhen(mNotificationPostTime);
        if (android.os.Build.VERSION.SDK_INT >= android.os.Build.VERSION_CODES.N) {
            builder.setCustomContentView(contentView);
        }else {
            builder.setContent(contentView);
        }

        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
            String channelId = "music_play";
            String channelName = "music_play";
            int importance = NotificationManager.IMPORTANCE_HIGH;
            NotificationManager notificationManager = (NotificationManager) getSystemService(Context.NOTIFICATION_SERVICE);
            NotificationChannel channel = new NotificationChannel(channelId, channelName, importance);
            // 设置通知出现时不震动
            channel.enableVibration(false);
            channel.enableLights(false);
            channel.setVibrationPattern(new long[]{0});
            channel.setSound(null, null);
            notificationManager.createNotificationChannel(channel);
            builder.setChannelId(channelId);
        }

        builder.setShowWhen(false);


        if (android.os.Build.VERSION.SDK_INT >= android.os.Build.VERSION_CODES.LOLLIPOP) {
            builder.setVisibility(Notification.VISIBILITY_PUBLIC);
            Notification.MediaStyle style = new Notification.MediaStyle()
                    .setMediaSession(mSession.getSessionToken());
            builder.setStyle(style);
        }

        return builder.build();
    }

需要注意的地方是setContent和setCustomContentView ，因为后者只能在android7以上使用，因此做了兼容。

在android7以上的机子运行效果如下：

界面是正常的，没有任何问题，但是测试发现在android5~6，会出现按钮不见，或者布局异常如下图：

不仅按钮不见，而且会出现一条横线。有的机型是没有横线但是按钮不见了无法控制播放暂停（按钮是用ImageView实现，remoteViews是支持的）。

 

开始是怀疑布局的问题，但是最终发现不是。

 

因为一开始想用系统的默认布局所以设置了Style,也就是以下的代码。既然自定义的话，也就没有必要设置以下代码了，去掉之后就正常了。

        if (android.os.Build.VERSION.SDK_INT >= android.os.Build.VERSION_CODES.LOLLIPOP) {
            builder.setVisibility(Notification.VISIBILITY_PUBLIC);
            Notification.MediaStyle style = new Notification.MediaStyle()
                    .setMediaSession(mSession.getSessionToken());
            builder.setStyle(style);
        }

修改后高版本正常，安卓5~6运行效果如下：

 

暂时如此解决，具体原因等我有空看看源代码在补充。