Android 当我尝试将Display设置为MediaPlayer时,曲面已释放
我的xml文件:Android 当我尝试将Display设置为MediaPlayer时,曲面已释放,android,surfaceview,android-mediaplayer,Android,Surfaceview,Android Mediaplayer,我的xml文件: <SurfaceView android:id="@+id/surfaceView" android:layout_marginTop="50dp" android:layout_width="fill_parent" android:layout_height="300dp" /> 日志如下所示: 04-24 22:19:33.645: W/System.err(16106): java.lang.IllegalArgumentE
<SurfaceView
android:id="@+id/surfaceView"
android:layout_marginTop="50dp"
android:layout_width="fill_parent"
android:layout_height="300dp" />
日志如下所示:
04-24 22:19:33.645: W/System.err(16106): java.lang.IllegalArgumentException: The surface has been released
04-24 22:19:33.645: W/System.err(16106): at android.media.MediaPlayer._setVideoSurface(Native Method)
04-24 22:19:33.645: W/System.err(16106): at android.media.MediaPlayer.setDisplay(MediaPlayer.java:698)
我在这里发现了一些类似的问题,但这些都不适合我。等待你的回答。非常感谢。表面可能会被破坏。这就是为什么需要将a
public void surfaceDestroyed(SurfaceHolder holder)
添加到SurfaceView的实现中,如下所示:
还应添加处理曲面创建的函数:
并通过以下方式修改您自己的函数:
mp.setDataSource("sdcard/test/a.3gp");
SurfaceHolder sh = sv.getHolder();
synchronized (this) {
while (!hasActiveHolder) {
try {
this.wait();
} catch (InterruptedException e) {
//Print something
}
}
mp.setDisplay(sh);
mp.prepare();
}
您还有另一个选择,即Google建议您使用SurfaceView的方式:在一个单独的线程中。这与执行顺序有关,因为在设置MediaPlayer的显示之前,必须先创建曲面,因此,您必须将回调方法
surfaceCreated
重写为以下内容:
@Override
public void surfaceCreated(SurfaceHolder holder) {
mp.setDisplay(sh); // now "mp" is defined as a class variable
}
现在不需要在播放方法中设置Display:
private MediaPlayer mp; // to use it inside surfaceCreated callback method
public void playVideo() {
mp = new MediaPlayer();
SurfaceView sv = (SurfaceView) this.findViewById(R.id.surfaceView);
try {
mp.setDataSource("sdcard/test/a.3gp");
SurfaceHolder sh = sv.getHolder();
mp.prepare();
mp.start();
} catch (IllegalArgumentException e) {
e.printStackTrace();
} catch (SecurityException e) {
e.printStackTrace();
} catch (IllegalStateException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
}
最简单的方法就是在
surfaceCreated
中调用setDisplay
:
@Override
public void surfaceCreated(SurfaceHolder holder) {
mp.setDisplay(holder)
}
不要忘记解开曲面的绑定:
@Override
public void surfaceDestroyed(SurfaceHolder holder) {
mp.setDisplay(null);
}
注意:媒体播放器应该在之前的某个地方初始化,例如在
onCreate
中,对于仍然存在问题的用户,请尝试在活动/fragment/etc中实现SurfaceHolder.Callback,并在onCreate/onCreateView方法中调用addCallback(SurfaceHolder.Callback Callback)方法,使用活动/fragment/etc作为参数回调。使用SurfaceHolder.Callback,如下所示
SurfaceView mSurfaceView = (SurfaceView) findViewById(R.id.surfaceView);
SurfaceHolder holder = mSurfaceView.getHolder();
final MediaPlayer player = new MediaPlayer();
holder.addCallback(new SurfaceHolder.Callback() {
@Override
public void surfaceCreated(SurfaceHolder holder) {
player.setDisplay(holder);
}
@Override
public void surfaceChanged(SurfaceHolder holder, int format, int width,
int height) {
}
@Override
public void surfaceDestroyed(SurfaceHolder holder) {
}
});
String UrlPath="android.resource://"+getActivity().getPackageName()+"/"+R.raw.your_file_name_without_extension;
try {
player.setDataSource(getActivity(),Uri.parse(UrlPath));
player.prepareAsync();
} catch (IOException e) {
e.printStackTrace();
}
player.setOnPreparedListener(new MediaPlayer.OnPreparedListener() {
@Override
public void onPrepared(MediaPlayer mp) {
mp.start();
}
});
我们可以查看VideoView源代码:
SurfaceHolder.Callback mSHCallback = new SurfaceHolder.Callback(){
...
public void surfaceCreated(SurfaceHolder holder)
{
mSurfaceHolder = holder;
openVideo();
}
private void openVideo() {
...
mMediaPlayer = new MediaPlayer();
mMediaPlayer.setDisplay(mSurfaceHolder);
}
}
因此,我们可以了解应该使用
mediaplayer.setDisplay()
在surfaceCreate
中调用方法。我尝试了你所说的,但不起作用,保持屏幕变黑。等待你的更多信息。非常感谢你的回答。我刚刚注意到,在surfaceDestroyed中,我在同一对象的同步块中放置了一个synchronized。删除第二个。看起来it’好像你被困在等待中。我建议,如果这不起作用,你可以附加一个调试器并暂停所有看到的线程,以便找到哪个线程处于等待状态()我尝试了另一种方法来修复它。创建曲面(“surfaceCreated”)时,我将“setDisplay”移到回调中。完成了。非常感谢你的回答!
@Override
public void surfaceDestroyed(SurfaceHolder holder) {
mp.setDisplay(null);
}
SurfaceView mSurfaceView = (SurfaceView) findViewById(R.id.surfaceView);
SurfaceHolder holder = mSurfaceView.getHolder();
final MediaPlayer player = new MediaPlayer();
holder.addCallback(new SurfaceHolder.Callback() {
@Override
public void surfaceCreated(SurfaceHolder holder) {
player.setDisplay(holder);
}
@Override
public void surfaceChanged(SurfaceHolder holder, int format, int width,
int height) {
}
@Override
public void surfaceDestroyed(SurfaceHolder holder) {
}
});
String UrlPath="android.resource://"+getActivity().getPackageName()+"/"+R.raw.your_file_name_without_extension;
try {
player.setDataSource(getActivity(),Uri.parse(UrlPath));
player.prepareAsync();
} catch (IOException e) {
e.printStackTrace();
}
player.setOnPreparedListener(new MediaPlayer.OnPreparedListener() {
@Override
public void onPrepared(MediaPlayer mp) {
mp.start();
}
});
SurfaceHolder.Callback mSHCallback = new SurfaceHolder.Callback(){
...
public void surfaceCreated(SurfaceHolder holder)
{
mSurfaceHolder = holder;
openVideo();
}
private void openVideo() {
...
mMediaPlayer = new MediaPlayer();
mMediaPlayer.setDisplay(mSurfaceHolder);
}
}