在更改方向后重新创建活动时，媒体播放器无法加载
问题描述：
我是新手，现在要使用曲面视图在视频播放器中播放视频，我想保存媒体播放器的实例状态，当重新加载或重新创建视图时方向发生变化时，旧媒体播放器状态从旧位置开始而不是按原始方式加载我在清单中设置了零位置，如屏幕方向，但未调用time oncreate，我想在屏幕方向更改时也要调用oncreate方法，这意味着我要在方向更改时重新加载新活动并保存媒体播放器状态，请确认我卡住了那时我不知道是什么错误.
I am new to play a video in video player using surface view now i want to save instance state of media player when orientation change when view reloaded or recreated then old media player state start at old position not to load on original means at zero position i set in manifest like screen orientation but that time oncreate not called i want to call also oncreate method when screen orientation change means to say i want to reload a new activity when orientation change and also save media player state please acknowledge i am stuck at that time i don't know what mistake.
SurfaceView videoSurface;
MediaPlayer player;
VideoControllerView controller;
private boolean mFullScreen = true;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_video_player);
videoSurface = (SurfaceView) findViewById(R.id.videoSurface);
SurfaceHolder videoHolder = videoSurface.getHolder();
videoHolder.addCallback(this);
player = new MediaPlayer();
controller = new VideoControllerView(this);
try {
player.setAudioStreamType(AudioManager.STREAM_MUSIC);
player.setDataSource(this, Uri.parse("http://clips.vorwaerts-gmbh.de/big_buck_bunny.mp4"));
player.setOnPreparedListener(this);
} catch (IllegalArgumentException e) {
e.printStackTrace();
} catch (SecurityException e) {
e.printStackTrace();
} catch (IllegalStateException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
}
@Override
public boolean onTouchEvent(MotionEvent event) {
controller.show();
return false;
}
// Implement SurfaceHolder.Callback
@Override
public void surfaceChanged(SurfaceHolder holder, int format, int width, int height) {
}
@Override
public void surfaceCreated(SurfaceHolder holder) {
player.setDisplay(holder);
player.prepareAsync();
}
@Override
public void surfaceDestroyed(SurfaceHolder holder) {
}
// End SurfaceHolder.Callback
// Implement MediaPlayer.OnPreparedListener
@Override
public void onPrepared(MediaPlayer mp) {
controller.setMediaPlayer(this);
controller.setAnchorView((FrameLayout) findViewById(R.id.videoSurfaceContainer));
player.start();
}
// End MediaPlayer.OnPreparedListener
// Implement VideoMediaController.MediaPlayerControl
@Override
public boolean canPause() {
return true;
}
@Override
public boolean canSeekBackward() {
return true;
}
@Override
public boolean canSeekForward() {
return true;
}
@Override
public int getBufferPercentage() {
return 0;
}
@Override
public int getCurrentPosition() {
return player.getCurrentPosition();
}
@Override
public int getDuration() {
return player.getDuration();
}
@Override
public boolean isPlaying() {
return player.isPlaying();
}
@Override
public void pause() {
player.pause();
}
@Override
public void seekTo(int i) {
player.seekTo(i);
}
@Override
public void start() {
player.start();
}
@Override
public boolean isFullScreen() {
if(mFullScreen){
Log.w("FullScreen", "--set icon full screen--");
Log.w("curr",player.getCurrentPosition()+"");
/* ImageButton mFullscreenButton=(ImageButton)controller.findViewById(R.id.fullscreen);
mFullscreenButton.setImageResource(R.drawable.ic_media_fullscreen_stretch);
*/ return false;
}else{
Log.w("FullScreen", "--set icon small full screen--");
return true;
}
}
@Override
public void toggleFullScreen() {
Log.w("FullScreen", "-----------------click toggleFullScreen-----------");
setFullScreen(isFullScreen());
}
// End VideoMediaController.MediaPlayerControl
public void setFullScreen(boolean fullScreen){
fullScreen = false;
if (mFullScreen)
{
Log.w("FullScreen", "-----------Set full screen SCREEN_ORIENTATION_LANDSCAPE------------");
setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_LANDSCAPE);
DisplayMetrics displaymetrics = new DisplayMetrics();
getWindowManager().getDefaultDisplay().getMetrics(displaymetrics);
int height = displaymetrics.heightPixels;
int width = displaymetrics.widthPixels;
android.widget.FrameLayout.LayoutParams params = (android.widget.FrameLayout.LayoutParams) videoSurface.getLayoutParams();
params.width = width;
params.height=height;
params.setMargins(0, 0, 0, 0);
//set icon is full screen
mFullScreen = fullScreen;
}
else{
Log.w("FullScreen", "-----------Set small screen SCREEN_ORIENTATION_PORTRAIT------------");
setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_PORTRAIT);
DisplayMetrics displaymetrics = new DisplayMetrics();
getWindowManager().getDefaultDisplay().getMetrics(displaymetrics);
final FrameLayout mFrame = (FrameLayout) findViewById(R.id.videoSurfaceContainer);
// int height = displaymetrics.heightPixels;
int height =225;//get height Frame Container video//mFrame.getHeight()
int width =displaymetrics.widthPixels;
android.widget.FrameLayout.LayoutParams params = (android.widget.FrameLayout.LayoutParams) videoSurface.getLayoutParams();
params.width = width;
params.height= height;
params.setMargins(0, 0, 0, 0);
//set icon is small screen
mFullScreen = !fullScreen;
}
}
@Override
protected void onSaveInstanceState(Bundle estadoguardado){
super.onSaveInstanceState(estadoguardado);
if(player!=null){
int pos=player.getCurrentPosition();
estadoguardado.putInt("posicion", pos);
}
}
@Override
protected void onRestoreInstanceState(Bundle estadoguardado)
{
super.onRestoreInstanceState(estadoguardado);
if(estadoguardado!=null && player!=null){
int pos=estadoguardado.getInt("posicion");
Log.w("position",pos+"");
player.seekTo(pos);
}
}
@Override
public void onResume()
{
super.onResume();
try {
//reinicia
Toast.makeText(this, "onResume2", Toast.LENGTH_SHORT).show();
if (player == null)
player.setDataSource(this, Uri.parse("http://clips.vorwaerts-gmbh.de/big_buck_bunny.mp4"));
player.seekTo(0);
player.setLooping(true);
player.start();
}
catch(Exception e)
{
e.printStackTrace();
}
}
@Override
public void onPause()
{
super.onPause();
Toast.makeText(this, "onPause2", Toast.LENGTH_SHORT).show();
//LIBERA A MEDIA PLAYER
if (player != null)
{
player.release();
player = null;
}
和其他从frameLayout扩展的类
and other class which extend from frameLayout
以及应用程序运行时会崩溃
and some crashes when app going to run
java.lang.IllegalStateException
at android.media.MediaPlayer.prepareAsync(Native Method)
at whizpool.videoplayerexample.VideoPlayerActivity.surfaceCreated(VideoPlayerActivity.java:70)
at android.view.SurfaceView.updateWindow(SurfaceView.java:554)
at android.view.SurfaceView.access$000(SurfaceView.java:81)
at android.view.SurfaceView$3.onPreDraw(SurfaceView.java:169)
at android.view.ViewTreeObserver.dispatchOnPreDraw(ViewTreeObserver.java:693)
at android.view.ViewRootImpl.performTraversals(ViewRootImpl.java:1762)
at android.os.Looper.loop(Looper.java:137)
at android.app.ActivityThread.main(ActivityThread.java:4666)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:511
10-12 10:00:48.726 2268-2268/whizpool.videoplayerexample E/MediaPlayer﹕ Attempt to perform seekTo in wrong state: mPlayer=0x18332b8, mCurrentState=2
10-12 10:00:48.726 2268-2268/whizpool.videoplayerexample E/MediaPlayer﹕ error (-38, 0)
10-12 10:00:48.727 2268-2268/whizpool.videoplayerexample E/MediaPlayer﹕ start called in state 0
10-12 10:00:48.727 2268-2268/whizpool.videoplayerexample E/MediaPlayer﹕ error (-38, 0)
10-12 10:00:48.738 2268-2268/whizpool.videoplayerexample E/MediaPlayer﹕ Error (-38,0)
10-12 10:00:48.738 2268-2268/whizpool.videoplayerexample E/MediaPlayer﹕ Error (-38,0)
10-12 10:00:48.885 2268-2268/whizpool.videoplayerexample E/MediaPlayer﹕ prepareAsync called in state 0
答
您需要在几秒钟后将方向重置为SCREEN_ORIENTATION_SENSOR，以便传感器将再次开始工作.
You need to reset the orientation to SCREEN_ORIENTATION_SENSOR after a few seconds so the sensor will start to work again..
setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_LANDSCAPE);
setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_LANDSCAPE);
new Handler().postDelayed(new Runnable(){
new Handler().postDelayed(new Runnable() {
@Override
public void run() {
setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_SENSOR);
}
}, 2000);