Android 的 MediaPlayer 多媒体播放器

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。

片] 程序截图

[代码] main.xml

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<?xml version="1.0" encoding="utf-8"?> 

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<LinearLayout android:id="@+id/LinearLayout01"

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android:layout_width="fill_parent" android:layout_height="fill_parent"

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xmlns:android="http://schemas.android.com/apk/res/android"

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android:orientation="vertical"> 

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<SeekBar android:id="@+id/SeekBar01" android:layout_height="wrap_content"

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android:layout_width="fill_parent"></SeekBar> 

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<LinearLayout android:id="@+id/LinearLayout02"

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android:layout_width="wrap_content" android:layout_height="wrap_content"> 

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<Button android:id="@+id/Button01" android:layout_width="wrap_content"

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android:layout_height="wrap_content" android:text="播放音频"></Button> 

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<Button android:id="@+id/Button02" android:layout_width="wrap_content"

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android:layout_height="wrap_content" android:text="停止播放"></Button> 

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</LinearLayout> 

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<SeekBar android:id="@+id/SeekBar02" android:layout_height="wrap_content"

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android:layout_width="fill_parent"></SeekBar> 

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<SurfaceView android:id="@+id/SurfaceView01"

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android:layout_width="fill_parent" android:layout_height="250px"></SurfaceView> 

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<LinearLayout android:id="@+id/LinearLayout02"

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android:layout_width="wrap_content" android:layout_height="wrap_content"> 

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<Button android:layout_width="wrap_content"

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android:layout_height="wrap_content" android:id="@+id/Button03"

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android:text="播放视频"></Button> 

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<Button android:layout_width="wrap_content"

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android:layout_height="wrap_content" android:text="停止播放" android:id="@+id/Button04"></Button> 

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</LinearLayout> 

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</LinearLayout>

[代码] TestMedia.java

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package com.testMedia; 

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import java.io.IOException; 

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import java.util.Timer; 

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import java.util.TimerTask; 

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import android.app.Activity; 

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import android.media.AudioManager; 

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import android.media.MediaPlayer; 

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import android.os.Bundle; 

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import android.view.SurfaceHolder; 

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import android.view.SurfaceView; 

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import android.view.View; 

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import android.widget.Button; 

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import android.widget.SeekBar; 

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import android.widget.Toast; 

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public class TestMedia extends Activity { 

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

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private SeekBar skb_audio=null; 

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private Button btn_start_audio = null; 

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private Button btn_stop_audio = null; 

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private SeekBar skb_video=null; 

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private Button btn_start_video = null; 

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private Button btn_stop_video = null; 

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private SurfaceView surfaceView; 

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private SurfaceHolder surfaceHolder; 

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private MediaPlayer m = null; 

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private Timer mTimer; 

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private TimerTask mTimerTask; 

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private boolean isChanging=false;//互斥变量，防止定时器与SeekBar拖动时进度冲突 

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@Override 

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public void onCreate(Bundle savedInstanceState) { 

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super.onCreate(savedInstanceState); 

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setContentView(R.layout.main); 

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//----------Media控件设置---------// 

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m=new MediaPlayer(); 

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//播放结束之后弹出提示 

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m.setOnCompletionListener(new MediaPlayer.OnCompletionListener(){ 

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@Override

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public void onCompletion(MediaPlayer arg0) { 

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

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m.release(); 

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} 

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}); 

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//----------定时器记录播放进度---------// 

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mTimer = new Timer(); 

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mTimerTask = new TimerTask() { 

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@Override

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public void run() { 

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if(isChanging==true) 

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return; 

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if(m.getVideoHeight()==0) 

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skb_audio.setProgress(m.getCurrentPosition()); 

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else 

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skb_video.setProgress(m.getCurrentPosition()); 

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} 

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}; 

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mTimer.schedule(mTimerTask, 0, 10); 

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

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

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btn_start_audio.setOnClickListener(new ClickEvent()); 

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btn_stop_audio.setOnClickListener(new ClickEvent()); 

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

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skb_audio.setOnSeekBarChangeListener(new SeekBarChangeEvent()); 

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

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

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btn_start_video.setOnClickListener(new ClickEvent()); 

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btn_stop_video.setOnClickListener(new ClickEvent()); 

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

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skb_video.setOnSeekBarChangeListener(new SeekBarChangeEvent()); 

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

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surfaceHolder = surfaceView.getHolder(); 

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surfaceHolder.setFixedSize(100, 100); 

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surfaceHolder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS); 

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} 

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/** 

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* 按键事件处理 

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*/

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class ClickEvent implements View.OnClickListener{ 

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@Override

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public void onClick(View v) { 

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if(v==btn_start_audio) 

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{ 

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m.reset();//恢复到未初始化的状态 

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

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

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try { 

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m.prepare(); //准备 

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} catch (IllegalStateException e) { 

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// TODO Auto-generated catch block 

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e.printStackTrace(); 

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} catch (IOException e) { 

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// TODO Auto-generated catch block 

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e.printStackTrace(); 

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} 

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m.start(); //播放 

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} 

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

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{ 

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m.stop(); 

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} 

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else if(v==btn_start_video) 

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{ 

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m.reset();//恢复到未初始化的状态 

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

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

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m.setAudioStreamType(AudioManager.STREAM_MUSIC); 

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m.setDisplay(surfaceHolder);//设置屏幕 

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try { 

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m.prepare(); 

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} catch (IllegalArgumentException e) { 

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// TODO Auto-generated catch block 

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e.printStackTrace(); 

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} catch (IllegalStateException e) { 

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// TODO Auto-generated catch block 

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e.printStackTrace(); 

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} catch (IOException e) { 

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// TODO Auto-generated catch block 

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e.printStackTrace(); 

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} 

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m.start(); 

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} 

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} 

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} 

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/** 

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* SeekBar进度改变事件 

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*/

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class SeekBarChangeEvent implements SeekBar.OnSeekBarChangeListener{ 

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@Override

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public void onProgressChanged(SeekBar seekBar, int progress, 

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boolean fromUser) { 

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// TODO Auto-generated method stub 

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} 

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@Override

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public void onStartTrackingTouch(SeekBar seekBar) { 

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isChanging=true; 

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} 

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@Override

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public void onStopTrackingTouch(SeekBar seekBar) { 

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m.seekTo(seekBar.getProgress()); 

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isChanging=false; 

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} 

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} 

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}