SurfaceView + MediaPlayer problem

1. The reason for the black screen: it may be because the surfaceView has not been created and played before it is definitely not possible, so it must be played in surfaceViewCreated

2. The second reason for the black screen: activity is The user is forced to close, or the interface, if you save the original state next time you come in, then the screen may be black, the starting point of playback must also be placed in surfaceViewCreate, you can only resume playback from here, and when the activity is forced to exit, you need to In surfaceDestroyed records the position, and if mediaPlayer is playing, it needs to be paused

public void surfaceDestroyed(SurfaceHolder holder){
if(mediaPlayer.isPlaying()){
position = MediaPlayer.getCurrentPosition();
mediaPlayer.stop();

3. Play After finishing, change the background image of surfaceView to sv.setBackgroundResource(R.drawable.bg_finish ); //Change the background image of SurfaceView

4. One of the stuttering problems, stuttering is a super serious problem: if it’s an error reported by prepare, please Put mp. The start(); method is placed in the listener event, that is, in the onPrepare method. This position is that you are not ready yet, how can you play it? Before you are ready, you can set it to continuously load the handle

5. One of the reasons why playback fails or the screen flashes directly: from one video activity or view to another video View playback, if the time is tight, it may immediately fail or crash. The reason for this is that the mediaPlayer has not had time to release, or the surfaceView has not been destroyed. In short, there are two objects, and it must have failed. Someone Speaking of the problem with the original Android device, if the operating system used by the device is modified by a third-party manufacturer, this element may appear. If it is the original ecology, it may not. The solution is to delay the playback of the second video, or A slight delay when jumping, or a pop-up is loading when the video is playing, let the progress bar delay the rotation time of one second, and then play, it should be able to solve this problem [http://doublekj.blog.163.com/blog /static/146818474201272453250354/]

1. privateRunnable runner=newRunnable()
2. {
3. @Override
4. public voidrun()
5. span>
6. handler.sendEmptyMessageDelayed(0,2000); li>

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6. It should be noted that when resetting multiple times, it will consume a part of the time, that is, the mediaPlayer playback time.

7. If mediaPlayer is destroyed many times and created many times, it may also allocate a certain amount of space each time. The cost is quite high, but it’s safe and won’t appear If it is null

8. If the same video is being played at this time, it will also cause the lagging reason

< p>9. Regarding the sound problem, it is better to execute after setting the data source:

put
mPlayer.setAudioStreamType(AudioManager.STREAM_SYSTEM);
replace
mPlayer.setAudioStreamType(AudioManager.STREAM_ALARM);
or
mediaPlayer.setAudioStreamType(AudioManager .STREAM_VOICE_CALL);//Handset mode

mediaPlayer 的方法是：

Valid and invalid states

surfaceView的相关概念：

MediaPlayer主要用于播放音频，它是没有提供输出图像的输出界面，这时我们就用到了SurfaceView控件，将它与MediaPlayer结合起来，就能达到了视频的输出了。首先来了SurfaceView这个控件类

SurfaceView类

构造方法

常用方法

SurfaceHolder

它是一个接口，用于管理SurfaceView。里面有两个常用的内部接口SurfaceHolder.Callback,SurfaceHolder.Callback2而Callback2是实现于Callback的

常用方法

SurfaceHolder.CallBack

在Callback里有三个抽象方法

如何理解这几个类或者接口之间的关系？

这样理解：

SurfaceView它用于显示，SurfaceHolder就是用于用来管理这个显示的SurfaceView对象的，但在SurfaceHolder是怎么样去管理这个对象的呢？这就用到了SurfceHolder.addCallback()方法添加一个SurfaceHolder接口的内部接口的三个抽象方法用于管理或者说是用于监听SurfaceView。这样就达到了管理SurfaceView的目的。

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