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Android 的 MediaPlayer 多媒体播放器
网友分享于:Jan 1, 1970 8:00:00 AM    来源: IT货架   

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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。

标签:MediaPlayer SurfaceView Android SDK

[2].[代码] main.xml 跳至 [1] [2] [3]

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<? xml version = "1.0" encoding = "utf-8" ?>
< LinearLayout android:id = "@+id/LinearLayout01"
    android:layout_width = "fill_parent" android:layout_height = "fill_parent"
    xmlns:android = "http://schemas.android.com/apk/res/android"
    android:orientation = "vertical" >
    < SeekBar android:id = "@+id/SeekBar01" android:layout_height = "wrap_content"
        android:layout_width = "fill_parent" ></ SeekBar >
    < LinearLayout android:id = "@+id/LinearLayout02"
        android:layout_width = "wrap_content" android:layout_height = "wrap_content" >
        < Button android:id = "@+id/Button01" android:layout_width = "wrap_content"
            android:layout_height = "wrap_content" android:text = "播放音频" ></ Button >
        < Button android:id = "@+id/Button02" android:layout_width = "wrap_content"
            android:layout_height = "wrap_content" android:text = "停止播放" ></ Button >
    </ LinearLayout >
    < SeekBar android:id = "@+id/SeekBar02" android:layout_height = "wrap_content"
        android:layout_width = "fill_parent" ></ SeekBar >
    < SurfaceView android:id = "@+id/SurfaceView01"
        android:layout_width = "fill_parent" android:layout_height = "250px" ></ SurfaceView >
    < LinearLayout android:id = "@+id/LinearLayout02"
        android:layout_width = "wrap_content" android:layout_height = "wrap_content" >
        < Button android:layout_width = "wrap_content"
            android:layout_height = "wrap_content" android:id = "@+id/Button03"
            android:text = "播放视频" ></ Button >
        < Button android:layout_width = "wrap_content"
            android:layout_height = "wrap_content" android:text = "停止播放" android:id = "@+id/Button04" ></ Button >
    </ LinearLayout >
</ LinearLayout >

[3].[代码] TestMedia.java 跳至 [1] [2] [3]

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package com.testMedia;
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 ;   
    }
      
  }
}

Android 的 MediaPlayer 多媒体播放器

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