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>