Go语言视频零基础入门到精通

yweii

今天要和大家介绍MediaPlayer的使用。MediaPlayer可以播放音频和视频，另外也可以通过VideoView来播放视频，虽然VideoView比MediaPlayer简单易用，但定制性不如用 MediaPlayer，要视情况选择了。MediaPlayer 播放音频比较简单，但是要播放视频就需要SurfaceView。SurfaceView 比普通的自定义 View 更有绘图上的优势，它支持完全的OpenGL ES 库。

java代码：

package eoe.demo;



import java.io.IOException;



import java.util.Timer;



import java.util.TimerTask;



import android.app.Activity;



import android.media.AudioManager;



import android.media.MediaPlayer;



import android.os.Bundle;



import android.view.SurfaceHolder;



import android.view.SurfaceView;



import android.view.View;



import android.widget.Button;



import android.widget.SeekBar;



import android.widget.Toast;



public class testMedia extends Activity {



/** Called when the activity is first created. */



private SeekBar skb_audio=null;



private Button btn_start_audio = null;



private Button btn_stop_audio = null;



private SeekBar skb_video=null;



private Button btn_start_video = null;



private Button btn_stop_video = null;



private SurfaceView surfaceView;



private SurfaceHolder surfaceHolder;



private MediaPlayer m = null;



private Timer mTimer;



private TimerTask mTimerTask;



private boolean isChanging=false;



//互斥变量，防止定时器与SeekBar 拖动时进度冲突



@Override



public void onCreate(Bundle savedInstanceState) {



super.onCreate(savedInstanceState);



setContentView(R.layout.main);



//‐‐‐‐‐‐‐‐‐‐Media 控件设置‐‐‐‐‐‐‐‐‐//



m=new MediaPlayer();



//播放结束之后弹出提示



m.setOnCompletionListener(new MediaPlayer.OnCompletionListener(){



@Override



public void onCompletion(MediaPlayer arg0) {



Toast.makeText(testMedia.this, “结束”, 1000).show();



m.release();



}



});



//‐‐‐‐‐‐‐‐‐‐定时器记录播放进度‐‐‐‐‐‐‐‐‐//



mTimer = new Timer();



mTimerTask = new TimerTask() {

@Override



public void run() {



if(isChanging==true)



return;



if(m.getVideoHeight()==0)



skb_audio.setProgress(m.getCurrentPosition());



else



skb_video.setProgress(m.getCurrentPosition());



}



};



mTimer.schedule(mTimerTask, 0, 10);



btn_start_audio = (Button) this.findViewById(R.id.Button01);



btn_stop_audio = (Button) this.findViewById(R.id.Button02);



btn_start_audio.setOnClickListener(new ClickEvent());



btn_stop_audio.setOnClickListener(new ClickEvent());



skb_audio=(SeekBar)this.findViewById(R.id.SeekBar01);



skb_audio.setOnSeekBarChangeListener(new SeekBarChangeEvent());



btn_start_video = (Button) this.findViewById(R.id.Button03);



btn_stop_video = (Button) this.findViewById(R.id.Button04);



btn_start_video.setOnClickListener(new ClickEvent());



btn_stop_video.setOnClickListener(new ClickEvent());



skb_video=(SeekBar)this.findViewById(R.id.SeekBar02);



skb_video.setOnSeekBarChangeListener(new SeekBarChangeEvent());



surfaceView = (SurfaceView) findViewById(R.id.SurfaceView01);



surfaceHolder = surfaceView.getHolder();



surfaceHolder.setFixedSize(100, 100);



surfaceHolder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);



}

/*



* 按键事件处理



*/



class ClickEvent implements View.OnClickListener{



@Override



public void onClick(View v) {



if(v==btn_start_audio)



{



m.reset();//恢复到未初始化的状态



m=MediaPlayer.create(testMedia.this, R.raw.big);//读取音频



skb_audio.setMax(m.getDuration());//设置SeekBar 的长度



try {



m.prepare(); //准备



} catch (IllegalStateException e) {



// TODO Auto‐generated catch block



e.printStackTrace();



} catch (IOException e) {



// TODO Auto‐generated catch block



e.printStackTrace();



}



m.start(); //播放



}



else if(v==btn_stop_audio || v==btn_stop_video)



{



m.stop();



}



else if(v==btn_start_video)



{



m.reset();//恢复到未初始化的状态



m=MediaPlayer.create(testMedia.this, R.raw.test);//读取视频



skb_video.setMax(m.getDuration());//设置SeekBar 的长度



m.setAudioStreamType(AudioManager.STREAM_MUSIC);



m.setDisplay(surfaceHolder);//设置屏幕



try {



m.prepare();



} catch (IllegalArgumentException e) {



// TODO Auto‐generated catch block



e.printStackTrace();



} catch (IllegalStateException e) {



// TODO Auto‐generated catch block



e.printStackTrace();



} catch (IOException e) {



// TODO Auto‐generated catch block



e.printStackTrace();



}



m.start();



}



}



}



/*



* SeekBar 进度改变事件



*/



class SeekBarChangeEvent implements SeekBar.OnSeekBarChangeListener{



@Override



public void onProgressChanged(SeekBar seekBar, int progress,boolean fromUser) {



// TODO Auto‐generated method stub



}



@Override



public void onStartTrackingTouch(SeekBar seekBar) {



isChanging=true;



}



@Override



public void onStopTrackingTouch(SeekBar seekBar) {



m.seekTo(seekBar.getProgress());



isChanging=false;



}



}

}


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