android中的多媒体应用MediaPlayer

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。

迷你音乐播放器

/Chapter11_Media_MiniPlayer/src/com/amaker/test/MainActivity.java

                    代码 
            
            packagecom.amaker.test; 
            
            importandroid.app.Activity; 
            importandroid.app.AlertDialog; 
            importandroid.media.MediaPlayer; 
            importandroid.os.Bundle; 
            importandroid.view.View; 
            importandroid.widget.ImageButton; 
            
            publicclassMainActivityextendsActivityimplementsMediaPlayer.OnCompletionListener{ 
             
            privateImageButtonplay,pause,stop; 
            privateMediaPlayermp; 
             
            @Override
            publicvoidonCreate(BundlesavedInstanceState){ 
            super.onCreate(savedInstanceState); 
            setContentView(R.layout.main); 
             
            play=(ImageButton)findViewById(R.id.play); 
            pause=(ImageButton)findViewById(R.id.pause); 
            stop=(ImageButton)findViewById(R.id.stop); 
             
            play.setOnClickListener(newView.OnClickListener(){ 
            publicvoidonClick(Viewview){ 
            play(); 
            } 
            }); 
             
            pause.setOnClickListener(newView.OnClickListener(){ 
            publicvoidonClick(Viewview){ 
            pause(); 
            } 
            }); 
             
            stop.setOnClickListener(newView.OnClickListener(){ 
            publicvoidonClick(Viewview){ 
            stop(); 
            } 
            }); 
             
            setup(); 
            } 
            
            @Override
            publicvoidonDestroy(){ 
            super.onDestroy(); 
            if(stop.isEnabled()){ 
            stop(); 
            } 
            } 
             
            publicvoidonCompletion(MediaPlayermp){ 
            stop(); 
            } 
             
            privatevoidplay(){ 
            mp.start(); 
             
            play.setEnabled(false); 
            pause.setEnabled(true); 
            stop.setEnabled(true); 
            } 
             
            privatevoidstop(){ 
            mp.stop(); 
            pause.setEnabled(false); 
            stop.setEnabled(false); 
             
            try{ 
            mp.prepare(); 
            mp.seekTo(0); 
            play.setEnabled(true); 
            } 
            catch(Throwablet){ 
            error(t); 
            } 
            } 
             
            privatevoidpause(){ 
            mp.pause(); 
            play.setEnabled(true); 
            pause.setEnabled(false); 
            stop.setEnabled(true); 
            } 
             
            privatevoidloadClip(){ 
            try{ 
            mp=MediaPlayer.create(this,R.raw.test); 
            mp.setOnCompletionListener(this); 
            } 
            catch(Throwablet){ 
            error(t); 
            } 
            } 
             
            privatevoidsetup(){ 
            loadClip(); 
            play.setEnabled(true); 
            pause.setEnabled(false); 
            stop.setEnabled(false); 
            } 
             
            privatevoiderror(Throwablet){ 
            AlertDialog.Builderbuilder=newAlertDialog.Builder(this); 
            builder 
            .setTitle("报错啦!") 
            .setMessage(t.toString()) 
            .setPositiveButton("确定",null) 
            .show(); 
            } 
            }

/Chapter11_Media_MiniPlayer/res/layout/main.xml

                    代码 
            
            <?xmlversion="1.0"encoding="utf-8"?> 
            <LinearLayoutxmlns:android="http://schemas.android.com/apk/res/android"
            android:orientation="vertical"android:layout_width="fill_parent"
            android:layout_height="fill_parent"> 
             
            <TextView 
            android:layout_width="fill_parent"
            android:layout_height="wrap_content" 
            android:text="迷你音乐播放器"/> 
             
            <LinearLayout 
            android:orientation="horizontal"android:layout_width="fill_parent"
            android:layout_height="fill_parent"> 
             
            <ImageButton 
            android:id="@+id/play"
            android:layout_width="wrap_content" 
            android:layout_height="wrap_content"
            android:src="@drawable/play"
            /> 
             
            <ImageButton 
            android:id="@+id/pause"
            android:layout_width="wrap_content" 
            android:layout_height="wrap_content"
            android:src="@drawable/pause"
            /> 
             
            <ImageButton 
            android:id="@+id/stop"
            android:layout_width="wrap_content" 
            android:layout_height="wrap_content"
            android:src="@drawable/stop"
            /> 
            </LinearLayout> 
            </LinearLayout>

/Chapter11_Media_MiniPlayer/AndroidManifest.xml

                    代码 
            
            <?xmlversion="1.0"encoding="utf-8"?>
            <manifestxmlns:android="http://schemas.android.com/apk/res/android"
            package="com.amaker.test"
            android:versionCode="1"
            android:versionName="1.0">
            <applicationandroid:icon="@drawable/icon"android:label="@string/app_name">
            <activityandroid:name=".MainActivity"
            android:label="@string/app_name">
            <intent-filter>
            <actionandroid:name="android.intent.action.MAIN"/>
            <categoryandroid:name="android.intent.category.LAUNCHER"/>
            </intent-filter>
            </activity>
            
            </application>
            <uses-sdkandroid:minSdkVersion="3"/>
            
            </manifest>

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