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Android 的 MediaPlayer 多媒体播放器

2024-10-19 02:48:02   214人阅读

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：MediaPlayerSurfaceView Android SDK

[1].[图片] 程序截图 跳至[1][2][3]

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[2].[代码] main.xml 跳至[1][2][3]

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<?xmlversion="1.0"encoding="utf-8"?>
<LinearLayoutandroid: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">
    <SeekBarandroid:id="@+id/SeekBar01"android:layout_height="wrap_content"
        android:layout_width="fill_parent"></SeekBar>
    <LinearLayoutandroid:id="@+id/LinearLayout02"
        android:layout_width="wrap_content"android:layout_height="wrap_content">
        <Buttonandroid:id="@+id/Button01"android:layout_width="wrap_content"
            android:layout_height="wrap_content"android:text="播放音频"></Button>
        <Buttonandroid:id="@+id/Button02"android:layout_width="wrap_content"
            android:layout_height="wrap_content"android:text="停止播放"></Button>
    </LinearLayout>
    <SeekBarandroid:id="@+id/SeekBar02"android:layout_height="wrap_content"
        android:layout_width="fill_parent"></SeekBar>
    <SurfaceViewandroid:id="@+id/SurfaceView01"
        android:layout_width="fill_parent"android:layout_height="250px"></SurfaceView>
    <LinearLayoutandroid:id="@+id/LinearLayout02"
        android:layout_width="wrap_content"android:layout_height="wrap_content">
        <Buttonandroid:layout_width="wrap_content"
            android:layout_height="wrap_content"android:id="@+id/Button03"
            android:text="播放视频"></Button>
        <Buttonandroid: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;
importjava.io.IOException;   importjava.util.Timer; importjava.util.TimerTask; importandroid.app.Activity;   importandroid.media.AudioManager; importandroid.media.MediaPlayer; importandroid.os.Bundle;   importandroid.view.SurfaceHolder; importandroid.view.SurfaceView; importandroid.view.View;   importandroid.widget.Button;   importandroid.widget.SeekBar; importandroid.widget.Toast;  
publicclass TestMedia extends Activity {
    /** Called when the activity is first created. */
    privateSeekBar skb_audio=null;
    privateButton btn_start_audio = null;  
    privateButton btn_stop_audio = null;
    privateSeekBar skb_video=null;
    privateButton btn_start_video = null;  
    privateButton btn_stop_video = null;
    privateSurfaceView surfaceView; 
    privateSurfaceHolder surfaceHolder; 
    
    privateMediaPlayer m = null;  
    privateTimer mTimer;
    privateTimerTask mTimerTask;
    
    privateboolean isChanging=false;//互斥变量，防止定时器与SeekBar拖动时进度冲突     @Override 
    publicvoid 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 = newTimer();
        mTimerTask = newTimerTask() {
            @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(newClickEvent());
        btn_stop_audio.setOnClickListener(newClickEvent());
        skb_audio=(SeekBar)this.findViewById(R.id.SeekBar01);
        skb_audio.setOnSeekBarChangeListener(newSeekBarChangeEvent());
        
        btn_start_video = (Button) this.findViewById(R.id.Button03);  
        btn_stop_video = (Button) this.findViewById(R.id.Button04);  
        btn_start_video.setOnClickListener(newClickEvent());
        btn_stop_video.setOnClickListener(newClickEvent());
        skb_video=(SeekBar)this.findViewById(R.id.SeekBar02);
        skb_video.setOnSeekBarChangeListener(newSeekBarChangeEvent());
        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
   */
  classClickEvent implementsView.OnClickListener{
    @Override
    publicvoid 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
   */
  classSeekBarChangeEvent implementsSeekBar.OnSeekBarChangeListener{
    @Override
    publicvoid onProgressChanged(SeekBar seekBar,int progress,
            boolean fromUser) {
        // TODO Auto-generated method stub        
    }
    @Override
    publicvoid onStartTrackingTouch(SeekBar seekBar) {
        isChanging=true;
    }
    @Override
    publicvoid onStopTrackingTouch(SeekBar seekBar) {
        m.seekTo(seekBar.getProgress());
        isChanging=false;   
    }
      
  }
}

Android 的 MediaPlayer 多媒体播放器


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