Android 使用MediaPlayer 播放 视频

http://pan.baidu.com/s/1lgKLS

package cn.bgxt.surfaceviewdemo; 
  
import java.io.File; 
  
import android.media.AudioManager; 
import android.media.MediaPlayer; 
import android.media.MediaPlayer.OnCompletionListener; 
import android.media.MediaPlayer.OnErrorListener; 
import android.media.MediaPlayer.OnPreparedListener; 
import android.os.Bundle; 
import android.app.Activity; 
import android.util.Log; 
import android.view.SurfaceHolder; 
import android.view.SurfaceHolder.Callback; 
import android.view.SurfaceView; 
import android.view.View; 
import android.widget.Button; 
import android.widget.EditText; 
import android.widget.SeekBar; 
import android.widget.SeekBar.OnSeekBarChangeListener; 
import android.widget.Toast; 
  
public class MainActivity extends Activity { 
private final String TAG = "main"; 
private EditText et_path; 
private SurfaceView sv; 
private Button btn_play, btn_pause, btn_replay, btn_stop; 
private MediaPlayer mediaPlayer; 
private SeekBar seekBar; 
private int currentPosition = 0; 
private boolean isPlaying; 
  
@Override 
protected void onCreate(Bundle savedInstanceState) { 
super.onCreate(savedInstanceState); 
setContentView(R.layout.activity_main); 
  
seekBar = (SeekBar) findViewById(R.id.seekBar); 
sv = (SurfaceView) findViewById(R.id.sv); 
et_path = (EditText) findViewById(R.id.et_path); 
  
btn_play = (Button) findViewById(R.id.btn_play); 
btn_pause = (Button) findViewById(R.id.btn_pause); 
btn_replay = (Button) findViewById(R.id.btn_replay); 
btn_stop = (Button) findViewById(R.id.btn_stop); 
  
btn_play.setOnClickListener(click); 
btn_pause.setOnClickListener(click); 
btn_replay.setOnClickListener(click); 
btn_stop.setOnClickListener(click); 
  
// 为SurfaceHolder添加回调 
sv.getHolder().addCallback(callback); 
// 4.0版本之下需要设置的属性 
// 设置Surface不维护自己的缓冲区，而是等待屏幕的渲染引擎将内容推送到界面 
// sv.getHolder().setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS); 
// 为进度条添加进度更改事件 
seekBar.setOnSeekBarChangeListener(change); 
} 
  
private Callback callback = new Callback() { 
// SurfaceHolder被修改的时候回调 
@Override 
public void surfaceDestroyed(SurfaceHolder holder) { 
Log.i(TAG, "SurfaceHolder 被销毁"); 
// 销毁SurfaceHolder的时候记录当前的播放位置并停止播放 
if (mediaPlayer != null && mediaPlayer.isPlaying()) { 
currentPosition = mediaPlayer.getCurrentPosition(); 
mediaPlayer.stop(); 
} 
} 
  
@Override 
public void surfaceCreated(SurfaceHolder holder) { 
Log.i(TAG, "SurfaceHolder 被创建"); 
if (currentPosition > 0) { 
// 创建SurfaceHolder的时候，如果存在上次播放的位置，则按照上次播放位置进行播放 
play(currentPosition); 
currentPosition = 0; 
} 
} 
  
@Override 
public void surfaceChanged(SurfaceHolder holder, int format, int width, 
int height) { 
Log.i(TAG, "SurfaceHolder 大小被改变"); 
} 
  
}; 
  
private OnSeekBarChangeListener change = new OnSeekBarChangeListener() { 
  
@Override 
public void onStopTrackingTouch(SeekBar seekBar) { 
// 当进度条停止修改的时候触发 
// 取得当前进度条的刻度 
int progress = seekBar.getProgress(); 
if (mediaPlayer != null && mediaPlayer.isPlaying()) { 
// 设置当前播放的位置 
mediaPlayer.seekTo(progress); 
} 
} 
  
@Override 
public void onStartTrackingTouch(SeekBar seekBar) { 
  
} 
  
@Override 
public void onProgressChanged(SeekBar seekBar, int progress, 
boolean fromUser) { 
  
} 
}; 
  
private View.OnClickListener click = new View.OnClickListener() { 
  
@Override 
public void onClick(View v) { 
  
switch (v.getId()) { 
case R.id.btn_play: 
play(0); 
break; 
case R.id.btn_pause: 
pause(); 
break; 
case R.id.btn_replay: 
replay(); 
break; 
case R.id.btn_stop: 
stop(); 
break; 
default: 
break; 
} 
} 
}; 
  
  
/* 
* 停止播放 
*/ 
protected void stop() { 
if (mediaPlayer != null && mediaPlayer.isPlaying()) { 
mediaPlayer.stop(); 
mediaPlayer.release(); 
mediaPlayer = null; 
btn_play.setEnabled(true); 
isPlaying = false; 
} 
} 
  
/** 
* 开始播放 
* 
* @param msec 播放初始位置 
*/ 
protected void play(final int msec) { 
// 获取视频文件地址 
String path = et_path.getText().toString().trim(); 
File file = new File(path); 
if (!file.exists()) { 
Toast.makeText(this, "视频文件路径错误", 0).show(); 
return; 
} 
try { 
mediaPlayer = new MediaPlayer(); 
mediaPlayer.setAudioStreamType(AudioManager.STREAM_MUSIC); 
// 设置播放的视频源 
mediaPlayer.setDataSource(file.getAbsolutePath()); 
// 设置显示视频的SurfaceHolder 
mediaPlayer.setDisplay(sv.getHolder());

//AssetFileDescriptor fileDescriptor = getAssets().openFd("welcome_video_scene_dark.mp4");
//mediaPlayer.setDataSource(fileDescriptor.getFileDescriptor(),fileDescriptor.getStartOffset(), fileDescriptor.getLength());

Log.i(TAG, "开始装载"); 
mediaPlayer.prepareAsync(); 
mediaPlayer.setOnPreparedListener(new OnPreparedListener() { 
  
@Override 
public void onPrepared(MediaPlayer mp) { 
Log.i(TAG, "装载完成"); 
mediaPlayer.start(); 
// 按照初始位置播放 
mediaPlayer.seekTo(msec); 
// 设置进度条的最大进度为视频流的最大播放时长 
seekBar.setMax(mediaPlayer.getDuration()); 
// 开始线程，更新进度条的刻度 
new Thread() { 
  
@Override 
public void run() { 
try { 
isPlaying = true; 
while (isPlaying) { 
int current = mediaPlayer 
.getCurrentPosition(); 
seekBar.setProgress(current); 
sleep(500); 
} 
} catch (Exception e) { 
e.printStackTrace(); 
} 
} 
}.start(); 
  
btn_play.setEnabled(false); 
} 
}); 
mediaPlayer.setOnCompletionListener(new OnCompletionListener() { 
  
@Override 
public void onCompletion(MediaPlayer mp) { 
// 在播放完毕被回调 
btn_play.setEnabled(true); 
} 
}); 
  
mediaPlayer.setOnErrorListener(new OnErrorListener() { 
  
@Override 
public boolean onError(MediaPlayer mp, int what, int extra) { 
// 发生错误重新播放 
play(0); 
isPlaying = false; 
return false; 
} 
}); 
} catch (Exception e) { 
e.printStackTrace(); 
} 
  
} 
  
/** 
* 重新开始播放 
*/ 
protected void replay() { 
if (mediaPlayer != null && mediaPlayer.isPlaying()) { 
mediaPlayer.seekTo(0); 
Toast.makeText(this, "重新播放", 0).show(); 
btn_pause.setText("暂停"); 
return; 
} 
isPlaying = false; 
play(0); 
  
} 
  
/** 
* 暂停或继续 
*/ 
protected void pause() { 
if (btn_pause.getText().toString().trim().equals("继续")) { 
btn_pause.setText("暂停"); 
mediaPlayer.start(); 
Toast.makeText(this, "继续播放", 0).show(); 
return; 
} 
if (mediaPlayer != null && mediaPlayer.isPlaying()) { 
mediaPlayer.pause(); 
btn_pause.setText("继续"); 
Toast.makeText(this, "暂停播放", 0).show(); 
} 
  
} 
  
} 

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
    android:paddingBottom="@dimen/activity_vertical_margin"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    tools:context=".MainActivity" >

    <EditText
        android:id="@+id/et_path"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="/sdcard/ykzzldx.mp4" />

    <SeekBar
        android:id="@+id/seekBar"
        android:layout_width="match_parent"
        android:layout_height="wrap_content" />

    <LinearLayout
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:orientation="horizontal" >

        <Button
            android:id="@+id/btn_play"
            android:layout_width="0dip"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:text="播放" />

        <Button
            android:id="@+id/btn_pause"
            android:layout_width="0dip"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:text="暂停" />

        <Button
            android:id="@+id/btn_replay"
            android:layout_width="0dip"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:text="重播" />

        <Button
            android:id="@+id/btn_stop"
            android:layout_width="0dip"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:text="停止" />
    </LinearLayout>

    <SurfaceView
        android:id="@+id/sv"
        android:layout_width="fill_parent"
        android:layout_height="fill_parent" />

</LinearLayout>