上下键控制音乐的开关

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首先要把android的键盘的上下键开启方法如下:寻找.android\avd\2,2avd\config.ini (用记事本打开)寻找hw.dpad，如果他的值为no，则改为yea。这样android模拟器中的上下键就能使用了。

设计布局文件，在布局文件中添加一个TextView：

activity_main.xml

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"    xmlns:tools="http://schemas.android.com/tools"    android:layout_width="match_parent"    android:layout_height="match_parent"    android:paddingBottom="@dimen/activity_vertical_margin"    android:paddingLeft="@dimen/activity_horizontal_margin"    android:paddingRight="@dimen/activity_horizontal_margin"    android:paddingTop="@dimen/activity_vertical_margin"    tools:context=".MainActivity" >    <TextView        android:id="@+id/textview1"        android:layout_width="wrap_content"        android:layout_height="wrap_content"/></RelativeLayout>

主要的Java代码如下所示：

MainActivity.java

package wang.md.shared_preferences;import android.os.Bundle;import android.app.Activity;import android.content.SharedPreferences;import android.view.KeyEvent;import android.view.Menu;import android.widget.TextView;public class MainActivity extends Activity {private MIDIPlayer mMIDIPlayer=null;private boolean mbMusic=false;private TextView mTextView=null;@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_main);mTextView=(TextView) this.findViewById(R.id.textview1);mMIDIPlayer=new MIDIPlayer(this);SharedPreferences settings=getPreferences(Activity.MODE_PRIVATE);mbMusic=settings.getBoolean("bmusic",false);if(mbMusic){mTextView.setText("当前音乐状态：开");mbMusic=true;mMIDIPlayer.playMusic();}else{mTextView.setText("当前音乐状态：关");}}public boolean onKeyUp(int keyCode,KeyEvent event){switch(keyCode){case KeyEvent.KEYCODE_DPAD_UP:mTextView.setText("当前音乐状态：开");mbMusic=true;mMIDIPlayer.playMusic();break;case KeyEvent.KEYCODE_DPAD_DOWN:mTextView.setText("当前音乐状态：关");mbMusic=false;mMIDIPlayer.freeMusic();break;}return true;}public boolean onKeyDown(int keyCode,KeyEvent event){if(keyCode==KeyEvent.KEYCODE_BACK){SharedPreferences uiState=getPreferences(0);SharedPreferences.Editor editor=uiState.edit();editor.commit();if(mbMusic){mMIDIPlayer.freeMusic();}this.finish();return true;}return super.onKeyDown(keyCode, event);}@Overridepublic boolean onCreateOptionsMenu(Menu menu) {// Inflate the menu; this adds items to the action bar if it is present.getMenuInflater().inflate(R.menu.main, menu);return true;}}

另外还要写一个音乐播放类：

MIDIPlayer.java

package wang.md.shared_preferences;import java.io.IOException;import android.content.Context;import android.media.MediaPlayer;import android.net.Uri;public class MIDIPlayer {public MediaPlayer playerMusic = null;private Context mContext = null;public MIDIPlayer(Context context) {mContext = context;}/* 播放音乐 */public void playMusic() {/* 装载资源中的音乐 */playerMusic = MediaPlayer.create(mContext, R.raw.start);/* 设置是否循环 */playerMusic.setLooping(true);try {playerMusic.prepare();} catch (IllegalStateException e) {e.printStackTrace();} catch (IOException e) {e.printStackTrace();}playerMusic.start();}/* 停止并释放音乐 */public void freeMusic() {if (playerMusic != null) {playerMusic.stop();playerMusic.release();}}}

另外在res目录下创建一个raw文件在里面添加你需要播放的音乐文件

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