Android 的 MediaPlayer 多媒体播放器

fmms 7年前
     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。    <div class="code_img">     <img alt="Android 的 MediaPlayer 多媒体播放器" src="https://simg.open-open.com/show/eb74438a149ac760196284947e9e444b.jpg" width="333" height="491" />     <br /> main.xml     <pre class="brush:xml; toolbar: true; auto-links: false;"><?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></pre>     <pre class="brush:java; toolbar: true; auto-links: false;">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;   }       }  }</pre>     <br />    </div>