android Multimedia实战（一）详解SurfaceView，TextureView之播放视频的四种方式

android Multimedia实战系列将聚焦于Android Multimedia模块，结合Android5.X到Android7.X或者到后来8.x 9.x最新Multimedia相关的API等，实现录制音视频，播放音视频，截图，录屏，编解码等实用功能！

下面不废话直接入正文：

github完整demo，欢迎star:https://github.com/WangShuo1143368701/VideoView

在Android中，我们有四种方式来实现视频的播放：

1、使用其自带的播放器。指定Action为ACTION_VIEW,Data为Uri，Type为其MIME类型。

2、使用VideoView来播放。在布局文件中使用VideoView结合MediaController来实现对其控制。

3、使用MediaPlayer类和SurfaceView来实现，这种方式很灵活。

4、使用MediaPlayer类和TextureView来实现，这种方式更灵活。

下面看代码示例：

1、调用其自带的播放器：

Uri uri = Uri.parse(Environment.getExternalStorageDirectory().getPath()+"/Test_Movie.m4v");
//调用系统自带的播放器
Intent intent = new Intent(Intent.ACTION_VIEW);
Log.v("URI:::::::::", uri.toString());
intent.setDataAndType(uri, "video/mp4");
startActivity(intent);

2、使用VideoView来实现：

Uri uri = Uri.parse(Environment.getExternalStorageDirectory().getPath()+"/Test_Movie.m4v");
VideoView videoView = (VideoView)this.findViewById(R.id.video_view);
videoView.setMediaController(new MediaController(this));
videoView.setVideoURI(uri);
videoView.start();
videoView.requestFocus();

在介绍三四中方式之前我们先比较一下SurfaceView及TextureView

SurfaceView优点及缺点：

优点：可以在一个独立的线程中进行绘制，不会影响主线程

使用双缓冲机制，播放视频时画面更流畅

缺点：Surface不在View hierachy中，它的显示也不受View的属性控制，所以不能进行平移，缩放等变换，也不能放在其它ViewGroup中。SurfaceView 不能嵌套使用

TextureView优点及缺点：

优点：支持移动、旋转、缩放等动画，支持截图

缺点：必须在硬件加速的窗口中使用，占用内存比SurfaceView高，在5.0以前在主线程渲染，5.0以后有单独的渲染线程。

小结：

从性能和安全性角度出发，使用播放器优先选SurfaceView。

1、在android 7.0上系统surfaceview的性能比TextureView更有优势，支持对象的内容位置和包含的应用内容同步更新，平移、缩放不会产生黑边。 在7.0以下系统如果使用场景有动画效果，可以选择性使用TextureView

2、由于失效(invalidation)和缓冲的特性，TextureView增加了额外1~3帧的延迟显示画面更新

3、TextureView总是使用GL合成，而SurfaceView可以使用硬件overlay后端，可以占用更少的内存带宽，消耗更少的能量

4、TextureView的内部缓冲队列导致比SurfaceView使用更多的内存

5、SurfaceView： 内部自己持有surface，surface 创建、销毁、大小改变时系统来处理的，通过surfaceHolder 的callback回调通知。当画布创建好时，可以将surface绑定到MediaPlayer中。SurfaceView如果为用户可见的时候，创建SurfaceView的SurfaceHolder用于显示视频流解析的帧图片，如果发现SurfaceView变为用户不可见的时候，则立即销毁SurfaceView的SurfaceHolder，以达到节约系统资源的目的

3、使用MediaPlayer类和SurfaceView来实现

package com.ws.videoview.videoview.view;

import android.content.Context;
import android.graphics.PixelFormat;
import android.media.AudioManager;
import android.media.MediaPlayer;
import android.media.MediaPlayer.OnInfoListener;
import android.media.MediaPlayer.OnVideoSizeChangedListener;
import android.net.Uri;
import android.os.Build;
import android.os.Handler;
import android.os.Message;
import android.text.TextUtils;
import android.util.AttributeSet;
import android.util.Log;
import android.view.KeyEvent;
import android.view.SurfaceHolder;
import android.view.SurfaceHolder.Callback;
import android.view.SurfaceView;

import java.io.IOException;

/**
* Created by Shuo.Wang on 2017/4/25.
*/

public class SurfaceVideoView extends SurfaceView implements Callback {

/** 定时暂停 */
private static final int HANDLER_MESSAGE_PARSE = 0;
/** 定时循环 */
private static final int HANDLER_MESSAGE_LOOP = 1;

private MediaPlayer.OnCompletionListener mOnCompletionListener;
private MediaPlayer.OnPreparedListener mOnPreparedListener;
private MediaPlayer.OnErrorListener mOnErrorListener;
private MediaPlayer.OnSeekCompleteListener mOnSeekCompleteListener;
private OnInfoListener mOnInfoListener;
private OnVideoSizeChangedListener mOnVideoSizeChangedListener;
private OnPlayStateListener mOnPlayStateListener;
private MediaPlayer mMediaPlayer = null;
private SurfaceHolder mSurfaceHolder = null;

private static final int STATE_ERROR = -1;
private static final int STATE_IDLE = 0;
private static final int STATE_PREPARING = 1;
private static final int STATE_PREPARED = 2;
private static final int STATE_PLAYING = 3;
private static final int STATE_PAUSED = 4;
/**
* PlaybackCompleted状态：文件正常播放完毕，而又没有设置循环播放的话就进入该状态，
* 并会触发OnCompletionListener的onCompletion
* ()方法。此时可以调用start()方法重新从头播放文件，也可以stop()停止MediaPlayer，或者也可以seekTo()来重新定位播放位置。
*/
private static final int STATE_PLAYBACK_COMPLETED = 5;
/** Released/End状态：通过release()方法可以进入End状态 */
private static final int STATE_RELEASED = 5;

private int mCurrentState = STATE_IDLE;
private int mTargetState = STATE_IDLE;

private int mVideoWidth;
private int mVideoHeight;
//  private int mSurfaceWidth;
//  private int mSurfaceHeight;

//  private float mSystemVolumn = -1;
private int mDuration;
private Uri mUri;

//  SurfaceTextureAvailable

public SurfaceVideoView(Context context, AttributeSet attrs, int defStyle) {
super(context, attrs, defStyle);
initVideoView();
}

public SurfaceVideoView(Context context) {
super(context);
initVideoView();
}

public SurfaceVideoView(Context context, AttributeSet attrs) {
super(context, attrs);
initVideoView();
}

@SuppressWarnings("deprecation")
protected void initVideoView() {
//      mTryCount = 0;
mVideoWidth = 0;
mVideoHeight = 0;

getHolder().setFormat(PixelFormat.RGBA_8888); // PixelFormat.RGB_565
getHolder().addCallback(this);
if (Build.VERSION.SDK_INT < Build.VERSION_CODES.HONEYCOMB) {
getHolder().setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);
}

setFocusable(true);
setFocusableInTouchMode(true);
requestFocus();

mCurrentState = STATE_IDLE;
mTargetState = STATE_IDLE;
}

/** 更新音量 */
public static float getSystemVolumn(Context context) {
if (context != null) {
try {
AudioManager mAudioManager = (AudioManager) context.getSystemService(Context.AUDIO_SERVICE);
int maxVolumn = mAudioManager.getStreamMaxVolume(AudioManager.STREAM_MUSIC);
return mAudioManager.getStreamVolume(AudioManager.STREAM_MUSIC) * 1.0F / maxVolumn;
} catch (UnsupportedOperationException e) {

}
}
return 0.5F;
}

public void setOnInfoListener(OnInfoListener l) {
mOnInfoListener = l;
}

public void setOnVideoSizeChangedListener(OnVideoSizeChangedListener l) {
mOnVideoSizeChangedListener = l;
}

public void setOnPreparedListener(MediaPlayer.OnPreparedListener l) {
mOnPreparedListener = l;
}

public void setOnErrorListener(MediaPlayer.OnErrorListener l) {
mOnErrorListener = l;
}

public void setOnPlayStateListener(OnPlayStateListener l) {
mOnPlayStateListener = l;
}

public void setOnSeekCompleteListener(MediaPlayer.OnSeekCompleteListener l) {
mOnSeekCompleteListener = l;
}

public static interface OnPlayStateListener {
public void onStateChanged(boolean isPlaying);
}

public void setOnCompletionListener(MediaPlayer.OnCompletionListener l) {
mOnCompletionListener = l;
}

public void setVideoPath(String path) {
// && MediaUtils.isNative(path)
if (!TextUtils.isEmpty(path)) {
mTargetState = STATE_PREPARED;
openVideo(Uri.parse(path));
}
}

public int getVideoWidth() {
return mVideoWidth;
}

public int getVideoHeight() {
return mVideoHeight;
}

public void reOpen() {
mTargetState = STATE_PREPARED;
openVideo(mUri);
}

public int getDuration() {
return mDuration;
}

/** 重试 */
private void tryAgain(Exception e) {
mCurrentState = STATE_ERROR;
openVideo(mUri);
}

public void start() {
mTargetState = STATE_PLAYING;
//可用状态{Prepared, Started, Paused, PlaybackCompleted}
if (mMediaPlayer != null && (mCurrentState == STATE_PREPARED || mCurrentState == STATE_PAUSED || mCurrentState == STATE_PLAYING || mCurrentState == STATE_PLAYBACK_COMPLETED)) {
try {
if (!isPlaying())
mMediaPlayer.start();
mCurrentState = STATE_PLAYING;
if (mOnPlayStateListener != null)
mOnPlayStateListener.onStateChanged(true);
} catch (IllegalStateException e) {
tryAgain(e);
} catch (Exception e) {
tryAgain(e);
}
}
}

public void pause() {
mTargetState = STATE_PAUSED;
//可用状态{Started, Paused}
if (mMediaPlayer != null && (mCurrentState == STATE_PLAYING)) {
try {
mMediaPlayer.pause();
mCurrentState = STATE_PAUSED;
if (mOnPlayStateListener != null)
mOnPlayStateListener.onStateChanged(false);
} catch (IllegalStateException e) {
tryAgain(e);
} catch (Exception e) {
tryAgain(e);
}
}
}

/** 处理音量键 */
public void dispatchKeyEvent(Context context, KeyEvent event) {
switch (event.getKeyCode()) {
case KeyEvent.KEYCODE_VOLUME_DOWN:
case KeyEvent.KEYCODE_VOLUME_UP:
setVolume(getSystemVolumn(context));
break;
}
}

public void setVolume(float volume) {
//可用状态{Idle, Initialized, Stopped, Prepared, Started, Paused, PlaybackCompleted}
if (mMediaPlayer != null && (mCurrentState == STATE_PREPARED || mCurrentState == STATE_PLAYING || mCurrentState == STATE_PAUSED || mCurrentState == STATE_PLAYBACK_COMPLETED)) {
try {
mMediaPlayer.setVolume(volume, volume);
} catch (Exception e) {

}
}
}

//  public float getSystemVolume() {
//      return mSystemVolumn;
//  }

public void setLooping(boolean looping) {
//可用状态{Idle, Initialized, Stopped, Prepared, Started, Paused, PlaybackCompleted}
if (mMediaPlayer != null && (mCurrentState == STATE_PREPARED || mCurrentState == STATE_PLAYING || mCurrentState == STATE_PAUSED || mCurrentState == STATE_PLAYBACK_COMPLETED)) {
try {
mMediaPlayer.setLooping(looping);
} catch (Exception e) {
}
}
}

public void seekTo(int msec) {
//可用状态{Prepared, Started, Paused, PlaybackCompleted}
if (mMediaPlayer != null && (mCurrentState == STATE_PREPARED || mCurrentState == STATE_PLAYING || mCurrentState == STATE_PAUSED || mCurrentState == STATE_PLAYBACK_COMPLETED)) {
try {
if (msec < 0)
msec = 0;
mMediaPlayer.seekTo(msec);
} catch (IllegalStateException e) {
} catch (Exception e) {
}
}
}

/** 获取当前播放位置 */
public int getCurrentPosition() {
int position = 0;
//可用状态{Idle, Initialized, Prepared, Started, Paused, Stopped, PlaybackCompleted}
if (mMediaPlayer != null) {
switch (mCurrentState) {
case STATE_PLAYBACK_COMPLETED:
position = getDuration();
break;
case STATE_PLAYING:
case STATE_PAUSED:
try {
position = mMediaPlayer.getCurrentPosition();
} catch (IllegalStateException e) {
} catch (Exception e) {
}
break;
}
}
return position;
}

public boolean isPlaying() {
//可用状态{Idle, Initialized, Prepared, Started, Paused, Stopped, PlaybackCompleted}
if (mMediaPlayer != null && mCurrentState == STATE_PLAYING) {
try {
return mMediaPlayer.isPlaying();
} catch (IllegalStateException e) {
} catch (Exception e) {
}
}
return false;
}

/** 调用release方法以后MediaPlayer无法再恢复使用 */
public void release() {
mTargetState = STATE_RELEASED;
mCurrentState = STATE_RELEASED;
if (mMediaPlayer != null) {
try {
mMediaPlayer.release();
} catch (IllegalStateException e) {
} catch (Exception e) {
}
mMediaPlayer = null;
}
}

public SurfaceHolder getSurfaceHolder() {
return mSurfaceHolder;
}

public void openVideo(Uri uri) {
if (uri == null || mSurfaceHolder == null || getContext() == null) {
// not ready for playback just yet, will try again later
if (mSurfaceHolder == null && uri != null) {
mUri = uri;
}
Log.e("openVideo ws--->","openVideo return");
return;
}

mUri = uri;
mDuration = 0;

//Idle 状态：当使用new()方法创建一个MediaPlayer对象或者调用了其reset()方法时，该MediaPlayer对象处于idle状态。
//End 状态：通过release()方法可以进入End状态，只要MediaPlayer对象不再被使用，就应当尽快将其通过release()方法释放掉
//Initialized 状态：这个状态比较简单，MediaPlayer调用setDataSource()方法就进入Initialized状态，表示此时要播放的文件已经设置好了。
//Prepared 状态：初始化完成之后还需要通过调用prepare()或prepareAsync()方法，这两个方法一个是同步的一个是异步的，只有进入Prepared状态，才表明MediaPlayer到目前为止都没有错误，可以进行文件播放。

Exception exception = null;
try {
if (mMediaPlayer == null) {
mMediaPlayer = new MediaPlayer();
mMediaPlayer.setOnPreparedListener(mPreparedListener);
mMediaPlayer.setOnCompletionListener(mCompletionListener);
mMediaPlayer.setOnErrorListener(mErrorListener);
mMediaPlayer.setOnVideoSizeChangedListener(mVideoSizeChangedListener);
mMediaPlayer.setAudioStreamType(AudioManager.STREAM_MUSIC);
mMediaPlayer.setOnSeekCompleteListener(mSeekCompleteListener);
mMediaPlayer.setOnInfoListener(mInfoListener);
//          mMediaPlayer.setScreenOnWhilePlaying(true);
//              mMediaPlayer.setVolume(mSystemVolumn, mSystemVolumn);
mMediaPlayer.setDisplay(mSurfaceHolder);
} else {
mMediaPlayer.reset();
}
mMediaPlayer.setDataSource(getContext(), uri);

//          if (mLooping)
//              mMediaPlayer.setLooping(true);//循环播放
mMediaPlayer.prepareAsync();
// we don't set the target state here either, but preserve the
// target state that was there before.
mCurrentState = STATE_PREPARING;
} catch (IOException ex) {
exception = ex;
} catch (IllegalArgumentException ex) {
exception = ex;
} catch (Exception ex) {
exception = ex;
}
if (exception != null) {
mCurrentState = STATE_ERROR;
if (mErrorListener != null)
mErrorListener.onError(mMediaPlayer, MediaPlayer.MEDIA_ERROR_UNKNOWN, 0);
}
}

private MediaPlayer.OnCompletionListener mCompletionListener = new MediaPlayer.OnCompletionListener() {
@Override
public void onCompletion(MediaPlayer mp) {
mCurrentState = STATE_PLAYBACK_COMPLETED;
//          mTargetState = STATE_PLAYBACK_COMPLETED;
if (mOnCompletionListener != null)
mOnCompletionListener.onCompletion(mp);
}
};

MediaPlayer.OnPreparedListener mPreparedListener = new MediaPlayer.OnPreparedListener() {
@Override
public void onPrepared(MediaPlayer mp) {
//必须是正常状态
if (mCurrentState == STATE_PREPARING) {
mCurrentState = STATE_PREPARED;
try {
mDuration = mp.getDuration();
} catch (IllegalStateException e) {
}

try {
mVideoWidth = mp.getVideoWidth();
mVideoHeight = mp.getVideoHeight();
} catch (IllegalStateException e) {
}

switch (mTargetState) {
case STATE_PREPARED:
if (mOnPreparedListener != null)
mOnPreparedListener.onPrepared(mMediaPlayer);
break;
case STATE_PLAYING:
start();
break;
}
}
}
};

OnVideoSizeChangedListener mVideoSizeChangedListener = new OnVideoSizeChangedListener() {

@Override
public void onVideoSizeChanged(MediaPlayer mp, int width, int height) {
mVideoWidth = width;
mVideoHeight = height;
if (mOnVideoSizeChangedListener != null)
mOnVideoSizeChangedListener.onVideoSizeChanged(mp, width, height);
}

};

OnInfoListener mInfoListener = new OnInfoListener() {

@Override
public boolean onInfo(MediaPlayer mp, int what, int extra) {
if (mOnInfoListener != null)
mOnInfoListener.onInfo(mp, what, extra);
return false;
}
};

private MediaPlayer.OnSeekCompleteListener mSeekCompleteListener = new MediaPlayer.OnSeekCompleteListener() {

@Override
public void onSeekComplete(MediaPlayer mp) {
if (mOnSeekCompleteListener != null)
mOnSeekCompleteListener.onSeekComplete(mp);
}
};

private MediaPlayer.OnErrorListener mErrorListener = new MediaPlayer.OnErrorListener() {
@Override
public boolean onError(MediaPlayer mp, int framework_err, int impl_err) {
mCurrentState = STATE_ERROR;
//          mTargetState = STATE_ERROR;
//FIX，可以考虑出错以后重新开始
if (mOnErrorListener != null)
mOnErrorListener.onError(mp, framework_err, impl_err);

return true;
}
};

/** 是否可用 */
public boolean isPrepared() {
return mMediaPlayer != null && (mCurrentState == STATE_PREPARED);
}

public boolean isComplate(){
return mMediaPlayer != null && (mCurrentState == STATE_PLAYBACK_COMPLETED);
}

/** 是否已经释放 */
public boolean isRelease() {
return mMediaPlayer == null || mCurrentState == STATE_IDLE || mCurrentState == STATE_ERROR || mCurrentState == STATE_RELEASED;
}

private Handler mVideoHandler = new Handler() {
@Override
public void handleMessage(Message msg) {
switch (msg.what) {
case HANDLER_MESSAGE_PARSE:
pause();
break;
case HANDLER_MESSAGE_LOOP:
if (isPlaying()) {
seekTo(msg.arg1);
sendMessageDelayed(mVideoHandler.obtainMessage(HANDLER_MESSAGE_LOOP, msg.arg1, msg.arg2), msg.arg2);
}
break;
default:
break;
}
super.handleMessage(msg);
}
};

/** 定时暂停 */
public void pauseDelayed(int delayMillis) {
if (mVideoHandler.hasMessages(HANDLER_MESSAGE_PARSE))
mVideoHandler.removeMessages(HANDLER_MESSAGE_PARSE);
mVideoHandler.sendEmptyMessageDelayed(HANDLER_MESSAGE_PARSE, delayMillis);
}

/** 暂停并且清除定时任务 */
public void pauseClearDelayed() {
pause();
if (mVideoHandler.hasMessages(HANDLER_MESSAGE_PARSE))
mVideoHandler.removeMessages(HANDLER_MESSAGE_PARSE);
if (mVideoHandler.hasMessages(HANDLER_MESSAGE_LOOP))
mVideoHandler.removeMessages(HANDLER_MESSAGE_LOOP);
}

/** 区域内循环播放 */
public void loopDelayed(int startTime, int endTime) {
if (mVideoHandler.hasMessages(HANDLER_MESSAGE_PARSE))
mVideoHandler.removeMessages(HANDLER_MESSAGE_PARSE);
if (mVideoHandler.hasMessages(HANDLER_MESSAGE_LOOP))
mVideoHandler.removeMessages(HANDLER_MESSAGE_LOOP);
int delayMillis = endTime - startTime;
seekTo(startTime);
if (!isPlaying())
start();
if (mVideoHandler.hasMessages(HANDLER_MESSAGE_LOOP))
mVideoHandler.removeMessages(HANDLER_MESSAGE_LOOP);
mVideoHandler.sendMessageDelayed(mVideoHandler.obtainMessage(HANDLER_MESSAGE_LOOP, getCurrentPosition(), delayMillis), delayMillis);
}

@Override
public void surfaceCreated(SurfaceHolder holder) {
boolean needReOpen = (mSurfaceHolder == null);
mSurfaceHolder = holder;
if (needReOpen) {
reOpen();
}
}

@Override
public void surfaceChanged(SurfaceHolder holder, int format, int width, int height) {
mSurfaceHolder = holder;
}

@Override
public void surfaceDestroyed(SurfaceHolder holder) {
mSurfaceHolder = null;
release();
}

@Override
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
super.onMeasure(widthMeasureSpec, heightMeasureSpec);
}
}

4、使用MediaPlayer类和TextureView来实现，这种方式更灵活。



TextureView特有API

1 getSurfaceTexture()

This method returns the SurfaceTexture used by this view.

2 getBitmap(int width, int height)

This method returns Returns a Bitmap representation of the content of the associated surface texture.

3 getTransform(Matrix transform)

This method returns the transform associated with this texture view.

4 isOpaque()

This method indicates whether this View is opaque.

5 lockCanvas()

This method start editing the pixels in the surface

6 setOpaque(boolean opaque)

This method indicates whether the content of this TextureView is opaque.

7 setTransform(Matrix transform)

This method sets the transform to associate with this texture view.

8 unlockCanvasAndPost(Canvas canvas)

This method finish editing pixels in the surface.

9 setAlpha和setRotation

package com.ws.videoview.videoview.view;

/**
* Created by Shuo.Wang on 2017/4/25.
*/

import android.content.Context;
import android.graphics.SurfaceTexture;
import android.media.AudioManager;
import android.media.MediaPlayer;
import android.net.Uri;
import android.os.Handler;
import android.os.Message;
import android.util.AttributeSet;
import android.view.Surface;
import android.view.TextureView;

import java.io.IOException;

public class TextureVideoView extends TextureView implements TextureView.SurfaceTextureListener {

private MediaPlayer.OnCompletionListener mOnCompletionListener;
private MediaPlayer.OnPreparedListener mOnPreparedListener;
private MediaPlayer.OnErrorListener mOnErrorListener;
private MediaPlayer.OnSeekCompleteListener mOnSeekCompleteListener;
private OnPlayStateListener mOnPlayStateListener;
private MediaPlayer mMediaPlayer = null;
private SurfaceTexture mSurfaceHolder = null;

private static final int STATE_ERROR = -1;
private static final int STATE_IDLE = 0;
private static final int STATE_PREPARING = 1;
private static final int STATE_PREPARED = 2;
private static final int STATE_PLAYING = 3;
private static final int STATE_PAUSED = 4;
private static final int STATE_STOP = 5;
/**
* PlaybackCompleted状态：文件正常播放完毕，而又没有设置循环播放的话就进入该状态，
* 并会触发OnCompletionListener的onCompletion
* ()方法。此时可以调用start()方法重新从头播放文件，也可以stop()停止MediaPlayer，或者也可以seekTo()来重新定位播放位置。
*/
private static final int STATE_PLAYBACK_COMPLETED = 5;
/** Released/End状态：通过release()方法可以进入End状态 */
private static final int STATE_RELEASED = 5;

private int mCurrentState = STATE_IDLE;
private int mTargetState = STATE_IDLE;

private int mVideoWidth;
private int mVideoHeight;
//  private int mSurfaceWidth;
//  private int mSurfaceHeight;

private float mVolumn = -1;
private int mDuration;
private Uri mUri;

//  SurfaceTextureAvailable

public TextureVideoView(Context context, AttributeSet attrs, int defStyle) {
super(context, attrs, defStyle);
initVideoView();
}

public TextureVideoView(Context context) {
super(context);
initVideoView();
}

public TextureVideoView(Context context, AttributeSet attrs) {
super(context, attrs);
initVideoView();
}

public MediaPlayer getMediaPlayer(){
return mMediaPlayer;
}

protected void initVideoView() {
try {
AudioManager mAudioManager = (AudioManager) getContext().getSystemService(Context.AUDIO_SERVICE);
mVolumn = mAudioManager.getStreamVolume(AudioManager.STREAM_MUSIC);
} catch (UnsupportedOperationException e) {

}
//      mTryCount = 0;
mVideoWidth = 0;
mVideoHeight = 0;
setSurfaceTextureListener(this);
//      setFocusable(true);
//      setFocusableInTouchMode(true);
//      requestFocus();
mCurrentState = STATE_IDLE;
mTargetState = STATE_IDLE;
}

public void setOnPreparedListener(MediaPlayer.OnPreparedListener l) {
mOnPreparedListener = l;
}

public void setOnErrorListener(MediaPlayer.OnErrorListener l) {
mOnErrorListener = l;
}

public void setOnPlayStateListener(OnPlayStateListener l) {
mOnPlayStateListener = l;
}

public void setOnSeekCompleteListener(MediaPlayer.OnSeekCompleteListener l) {
mOnSeekCompleteListener = l;
}

public static interface OnPlayStateListener {
public void onStateChanged(boolean isPlaying);
}

public void setOnCompletionListener(MediaPlayer.OnCompletionListener l) {
mOnCompletionListener = l;
}

public void setVideoPath(String path) {
//      if (StringUtils.isNotEmpty(path) && MediaUtils.isNative(path)) {
mTargetState = STATE_PREPARED;
openVideo(Uri.parse(path));
//      }
}

public int getVideoWidth() {
return mVideoWidth;
}

public int getVideoHeight() {
return mVideoHeight;
}

public void reOpen() {
mTargetState = STATE_PREPARED;
openVideo(mUri);
}

public int getDuration() {
return mDuration;
}

/** 重试 */
private void tryAgain(Exception e) {
e.printStackTrace();
mCurrentState = STATE_ERROR;
openVideo(mUri);
}

public void start() {
mTargetState = STATE_PLAYING;
//可用状态{Prepared, Started, Paused, PlaybackCompleted}
if (mMediaPlayer != null && (mCurrentState == STATE_PREPARED || mCurrentState == STATE_PAUSED || mCurrentState == STATE_PLAYING || mCurrentState == STATE_PLAYBACK_COMPLETED)) {
try {
if (!isPlaying())
mMediaPlayer.start();
mCurrentState = STATE_PLAYING;
if (mOnPlayStateListener != null)
mOnPlayStateListener.onStateChanged(true);
} catch (IllegalStateException e) {
tryAgain(e);
} catch (Exception e) {
tryAgain(e);
}
}
}

public void pause() {
mTargetState = STATE_PAUSED;
//可用状态{Started, Paused}
if (mMediaPlayer != null && (mCurrentState == STATE_PLAYING || mCurrentState == STATE_PAUSED)) {
try {
mMediaPlayer.pause();
mCurrentState = STATE_PAUSED;
if (mOnPlayStateListener != null)
mOnPlayStateListener.onStateChanged(false);
} catch (IllegalStateException e) {
tryAgain(e);
} catch (Exception e) {
tryAgain(e);
}
}
}

public void stop(){
mTargetState = STATE_STOP;
if (mMediaPlayer != null && (mCurrentState == STATE_PLAYING || mCurrentState == STATE_PAUSED)) {
try {
mMediaPlayer.stop();
mCurrentState = STATE_STOP;
if (mOnPlayStateListener != null)
mOnPlayStateListener.onStateChanged(false);
} catch (IllegalStateException e) {
tryAgain(e);
} catch (Exception e) {
tryAgain(e);
}
}
}

public void setVolume(float volume) {
//可用状态{Idle, Initialized, Stopped, Prepared, Started, Paused, PlaybackCompleted}
if (mMediaPlayer != null && (mCurrentState == STATE_PREPARED || mCurrentState == STATE_PLAYING || mCurrentState == STATE_PAUSED || mCurrentState == STATE_PLAYBACK_COMPLETED)) {
try {
mMediaPlayer.setVolume(volume, volume);
} catch (Exception e) {
e.printStackTrace();
}
}
}

public void setLooping(boolean looping) {
//可用状态{Idle, Initialized, Stopped, Prepared, Started, Paused, PlaybackCompleted}
if (mMediaPlayer != null && (mCurrentState == STATE_PREPARED || mCurrentState == STATE_PLAYING || mCurrentState == STATE_PAUSED || mCurrentState == STATE_PLAYBACK_COMPLETED)) {
try {
mMediaPlayer.setLooping(looping);
} catch (Exception e) {
e.printStackTrace();
}
}
}

public void seekTo(int msec) {
//可用状态{Prepared, Started, Paused, PlaybackCompleted}
if (mMediaPlayer != null && (mCurrentState == STATE_PREPARED || mCurrentState == STATE_PLAYING || mCurrentState == STATE_PAUSED || mCurrentState == STATE_PLAYBACK_COMPLETED)) {
try {
if (msec < 0)
msec = 0;
mMediaPlayer.seekTo(msec);
} catch (IllegalStateException e) {
e.printStackTrace();
} catch (Exception e) {
e.printStackTrace();
}
}
}

/** 获取当前播放位置 */
public int getCurrentPosition() {
int position = 0;
//可用状态{Idle, Initialized, Prepared, Started, Paused, Stopped, PlaybackCompleted}
if (mMediaPlayer != null) {
switch (mCurrentState) {
case STATE_PLAYBACK_COMPLETED:
position = getDuration();
break;
case STATE_PLAYING:
case STATE_PAUSED:
try {
position = mMediaPlayer.getCurrentPosition();
} catch (IllegalStateException e) {
e.printStackTrace();
} catch (Exception e) {
e.printStackTrace();
}
break;
}
}
return position;
}

public boolean isPlaying() {
//可用状态{Idle, Initialized, Prepared, Started, Paused, Stopped, PlaybackCompleted}
if (mMediaPlayer != null && mCurrentState == STATE_PLAYING) {
try {
return mMediaPlayer.isPlaying();
} catch (IllegalStateException e) {
e.printStackTrace();
} catch (Exception e) {
e.printStackTrace();
}
}
return false;
}

/** 调用release方法以后MediaPlayer无法再恢复使用 */
public void release() {
mTargetState = STATE_RELEASED;
mCurrentState = STATE_RELEASED;
if (mMediaPlayer != null) {
try {
mMediaPlayer.release();
} catch (IllegalStateException e) {
e.printStackTrace();
} catch (Exception e) {
e.printStackTrace();
}
mMediaPlayer = null;
}
}

public void openVideo(Uri uri) {
if (uri == null || mSurfaceHolder == null || getContext() == null) {
// not ready for playback just yet, will try again later
if (mSurfaceHolder == null && uri != null) {
mUri = uri;
}
return;
}

mUri = uri;
mDuration = 0;

//Idle 状态：当使用new()方法创建一个MediaPlayer对象或者调用了其reset()方法时，该MediaPlayer对象处于idle状态。
//End 状态：通过release()方法可以进入End状态，只要MediaPlayer对象不再被使用，就应当尽快将其通过release()方法释放掉
//Initialized 状态：这个状态比较简单，MediaPlayer调用setDataSource()方法就进入Initialized状态，表示此时要播放的文件已经设置好了。
//Prepared 状态：初始化完成之后还需要通过调用prepare()或prepareAsync()方法，这两个方法一个是同步的一个是异步的，只有进入Prepared状态，才表明MediaPlayer到目前为止都没有错误，可以进行文件播放。

Exception exception = null;
try {
if (mMediaPlayer == null) {
mMediaPlayer = new MediaPlayer();
mMediaPlayer.setOnPreparedListener(mPreparedListener);
mMediaPlayer.setOnCompletionListener(mCompletionListener);
mMediaPlayer.setOnErrorListener(mErrorListener);
mMediaPlayer.setAudioStreamType(AudioManager.STREAM_MUSIC);
mMediaPlayer.setOnSeekCompleteListener(mSeekCompleteListener);
//          mMediaPlayer.setScreenOnWhilePlaying(true);
mMediaPlayer.setVolume(mVolumn, mVolumn);
mMediaPlayer.setSurface(new Surface(mSurfaceHolder));
} else {
mMediaPlayer.reset();
}
mMediaPlayer.setDataSource(getContext(), uri);

//          if (mLooping)
//              mMediaPlayer.setLooping(true);//循环播放
mMediaPlayer.prepareAsync();
// we don't set the target state here either, but preserve the
// target state that was there before.
mCurrentState = STATE_PREPARING;
} catch (IOException ex) {
exception = ex;
} catch (IllegalArgumentException ex) {
exception = ex;
} catch (Exception ex) {
exception = ex;
}
if (exception != null) {
exception.printStackTrace();
mCurrentState = STATE_ERROR;
if (mErrorListener != null)
mErrorListener.onError(mMediaPlayer, MediaPlayer.MEDIA_ERROR_UNKNOWN, 0);
}
}

private MediaPlayer.OnCompletionListener mCompletionListener = new MediaPlayer.OnCompletionListener() {
@Override
public void onCompletion(MediaPlayer mp) {
mCurrentState = STATE_PLAYBACK_COMPLETED;
//          mTargetState = STATE_PLAYBACK_COMPLETED;
if (mOnCompletionListener != null)
mOnCompletionListener.onCompletion(mp);
}
};

MediaPlayer.OnPreparedListener mPreparedListener = new MediaPlayer.OnPreparedListener() {
@Override
public void onPrepared(MediaPlayer mp) {
//必须是正常状态
if (mCurrentState == STATE_PREPARING) {
mCurrentState = STATE_PREPARED;
try {
mDuration = mp.getDuration();
} catch (IllegalStateException e) {
e.printStackTrace();
}

try {
mVideoWidth = mp.getVideoWidth();
mVideoHeight = mp.getVideoHeight();
} catch (IllegalStateException e) {
e.printStackTrace();
}

switch (mTargetState) {
case STATE_PREPARED:
if (mOnPreparedListener != null)
mOnPreparedListener.onPrepared(mMediaPlayer);
break;
case STATE_PLAYING:
start();
break;
}
}
}
};

private MediaPlayer.OnSeekCompleteListener mSeekCompleteListener = new MediaPlayer.OnSeekCompleteListener() {

@Override
public void onSeekComplete(MediaPlayer mp) {
if (mOnSeekCompleteListener != null)
mOnSeekCompleteListener.onSeekComplete(mp);
}
};

private MediaPlayer.OnErrorListener mErrorListener = new MediaPlayer.OnErrorListener() {
@Override
public boolean onError(MediaPlayer mp, int framework_err, int impl_err) {
mCurrentState = STATE_ERROR;
//          mTargetState = STATE_ERROR;
//FIX，可以考虑出错以后重新开始
if (mOnErrorListener != null)
mOnErrorListener.onError(mp, framework_err, impl_err);

return true;
}
};

@Override
public void onSurfaceTextureAvailable(SurfaceTexture surface, int width, int height) {
boolean needReOpen = (mSurfaceHolder == null);
mSurfaceHolder = surface;
if (needReOpen) {
reOpen();
}
}

@Override
public void onSurfaceTextureSizeChanged(SurfaceTexture surface, int width, int height) {

}

@Override
public boolean onSurfaceTextureDestroyed(SurfaceTexture surface) {
//画布失效
mSurfaceHolder = null;
release();
return true;
}

@Override
public void onSurfaceTextureUpdated(SurfaceTexture surface) {

}

/** 是否可用 */
public boolean isPrepared() {
//|| mCurrentState == STATE_PAUSED || mCurrentState == STATE_PLAYING
return mMediaPlayer != null && (mCurrentState == STATE_PREPARED);
}

//  /** 是否能即可播放 */
//  public boolean canStart() {
//      return mMediaPlayer != null && (mCurrentState == STATE_PREPARED || mCurrentState == STATE_PAUSED);
//  }

private static final int HANDLER_MESSAGE_PARSE = 0;
private static final int HANDLER_MESSAGE_LOOP = 1;

private Handler mVideoHandler = new Handler() {
@Override
public void handleMessage(Message msg) {
switch (msg.what) {
case HANDLER_MESSAGE_PARSE:
pause();
break;
case HANDLER_MESSAGE_LOOP:
if (isPlaying()) {
seekTo(msg.arg1);
sendMessageDelayed(mVideoHandler.obtainMessage(HANDLER_MESSAGE_LOOP, msg.arg1, msg.arg2), msg.arg2);
}
break;
default:
break;
}
super.handleMessage(msg);
}
};

/** 定时暂停 */
public void pauseDelayed(int delayMillis) {
if (mVideoHandler.hasMessages(HANDLER_MESSAGE_PARSE))
mVideoHandler.removeMessages(HANDLER_MESSAGE_PARSE);
mVideoHandler.sendEmptyMessageDelayed(HANDLER_MESSAGE_PARSE, delayMillis);
}

/** 暂停并且清除定时任务 */
public void pauseClearDelayed() {
pause();
if (mVideoHandler.hasMessages(HANDLER_MESSAGE_PARSE))
mVideoHandler.removeMessages(HANDLER_MESSAGE_PARSE);
if (mVideoHandler.hasMessages(HANDLER_MESSAGE_LOOP))
mVideoHandler.removeMessages(HANDLER_MESSAGE_LOOP);
}

/** 区域内循环播放 */
public void loopDelayed(int startTime, int endTime) {
int delayMillis = endTime - startTime;
seekTo(startTime);
if (!isPlaying())
start();
if (mVideoHandler.hasMessages(HANDLER_MESSAGE_LOOP))
mVideoHandler.removeMessages(HANDLER_MESSAGE_LOOP);
mVideoHandler.sendMessageDelayed(mVideoHandler.obtainMessage(HANDLER_MESSAGE_LOOP, getCurrentPosition(), delayMillis), delayMillis);
}
}