MusicLibrary-丰富的音频播放SDK.(2)

配置通知栏时，最重要的事情是如何在布局中获取相应的资源文件和相关控件，这是通过Resources#getIdentifier方法获得的:

private Resources res;
private String packageName;
public MediaNotificationManager(){
     packageName = mService.getApplicationContext().getPackageName();
     res = mService.getApplicationContext().getResources();
}
private int getResourceId(String name, String className) {
    return res.getIdentifier(name, className, packageName);
}
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由于您需要能够动态配置它，因此需要在通知栏中命名约定相关资源和ID. 例如，我想得到

将白色背景上的ContentView布局文件分配给RemoteView:

RemoteViews remoteView = new RemoteViews(packageName, 
                                         getResourceId("view_notify_light_play", "layout"));
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只要您的布局文件名为view_notify_light_play.xml，就可以正确获取它.

因此，所有不同的布局和不同的资源都是通过getResourceId方法获得的.

更新用户界面分为以下三个步骤:

续订RemoteView，替换旧的RemoteView，将新的RemoteView分配给Notification.contentView和Notification.bigContentView，更新RemoteView的UI并调用NotificationManager.notify（NOTIFICATION_ID，mNotification）;刷新.

在开始播放时更新播放/暂停按钮的用户界面:

public void updateViewStateAtStart() {
    if (mNotification != null) {
        boolean isDark = NotificationColorUtils.isDarkNotificationBar(mService);
        mRemoteView = createRemoteViews(isDark, false);
        mBigRemoteView = createRemoteViews(isDark, true);
        if (Build.VERSION.SDK_INT >= 16) {
            mNotification.bigContentView = mBigRemoteView;
        }
        mNotification.contentView = mRemoteView;
        if (mRemoteView != null) {
            mRemoteView.setImageViewResource(getResourceId(ID_IMG_NOTIFY_PLAY_OR_PAUSE, "id"),
                    getResourceId(isDark ? DRAWABLE_NOTIFY_BTN_DARK_PAUSE_SELECTOR :
                            DRAWABLE_NOTIFY_BTN_LIGHT_PAUSE_SELECTOR, "drawable"));
            
            if (mBigRemoteView != null) {
                mBigRemoteView.setImageViewResource(getResourceId(ID_IMG_NOTIFY_PLAY_OR_PAUSE, "id"),
                        getResourceId(isDark ? DRAWABLE_NOTIFY_BTN_DARK_PAUSE_SELECTOR :
                                DRAWABLE_NOTIFY_BTN_LIGHT_PAUSE_SELECTOR, "drawable"));
            }
            mNotificationManager.notify(NOTIFICATION_ID, mNotification);
        }
    }
}
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click事件由RemoteView.setOnClickPendingIntent（PendingIntentendingIntent）方法实现.

如果可以动态配置它，关键是配置PendingIntent.

这个想法是: 如果PendingIntent是从外部传入的，则使用传入的PendingIntent，否则使用默认的PendingIntent.

private PendingIntent startOrPauseIntent;
public MediaNotificationManager(){
    setStartOrPausePendingIntent(creater.getStartOrPauseIntent());  
}
 
private RemoteViews createRemoteViews(){
    if (startOrPauseIntent != null) {
         remoteView.setOnClickPendingIntent(getResourceId(ID_IMG_NOTIFY_PLAY_OR_PAUSE, "id"), 
         startOrPauseIntent);
    }
}
private void setStartOrPausePendingIntent(PendingIntent pendingIntent) {
    startOrPauseIntent = pendingIntent == null ? getPendingIntent(ACTION_PLAY_PAUSE) : pendingIntent;
}
private PendingIntent getPendingIntent(String action) {
    Intent intent = new Intent(action);
    intent.setClass(mService, PlayerReceiver.class);
    return PendingIntent.getBroadcast(mService, 0, intent, 0);
}
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如您所见，完整的代码如上所示. 如果creater.getStartOrPauseIntent（）不为空播放器build，请使用creater.getStartOrPauseIntent（）

否则，请使用默认值.

我希望你喜欢它！ ^ _ ^

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