Android(安卓)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>

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