Android SharedPreferences数据存储

package com.Aina.Android;

import java.io.IOException;

import android.content.Context;
import android.media.MediaPlayer;

/**
 * com.Aina.Android
 * Pro_SharedPreferences
 * @author Aina.huang  E-mail: [e-mail]
 * @version 创建时间：2010 Jun 18, 2010 5:11:14 PM 
 * 类说明 
 */
public class MIDIPlayer {

	private MediaPlayer mMediaPlayer = null;
	private Context mContext = null;
	
	public MIDIPlayer(Context context){
		this.mContext = context;
	}
	//播放音乐
	public void PlayMusic(){
		mMediaPlayer = MediaPlayer.create(mContext, R.raw.start);//装载音乐
		mMediaPlayer.setLooping(true);//设置是否循环播放
		try {
			mMediaPlayer.prepare();
		} catch (IllegalStateException e) {
			e.printStackTrace();
		} catch (IOException e) {
			e.printStackTrace();
		}
		mMediaPlayer.start();
	}
	//停止并是否音乐
	public void FreeMusic(){
		if(mMediaPlayer != null){
			mMediaPlayer.stop();
			mMediaPlayer.release();			
		}
	}
}

package com.Aina.Android;

import android.app.Activity;
import android.content.SharedPreferences;
import android.os.Bundle;
import android.util.Log;
import android.view.KeyEvent;
import android.widget.TextView;

public class Test_SharedPreferences extends Activity {
	/** Called when the activity is first created. */
	private MIDIPlayer mMIDIPlayer = null;
	private Boolean mbMusic = false;
	private TextView tv = null;
	@Override
	public void onCreate(Bundle savedInstanceState) {
		Log.i("TAG-onCreate", "onCreate()");
		super.onCreate(savedInstanceState);
		setContentView(R.layout.main);
		tv = (TextView) this.findViewById(R.id.TextView);
		mMIDIPlayer = new MIDIPlayer(this);
		//取得活动的Preferences对象.
		SharedPreferences settings = this.getPreferences(Activity.MODE_PRIVATE);
		//取得值
		mbMusic = settings.getBoolean("bmusic", false);
		if(mbMusic){
			tv.setText("当前音乐状态:开");
			mbMusic = true;
			mMIDIPlayer.PlayMusic();//播放
		}else{
			tv.setText("当前音乐状态:关");
			mbMusic = false;
		}
	}
	@Override
	public boolean onKeyDown(int keyCode, KeyEvent event) {
		if(keyCode==KeyEvent.KEYCODE_DPAD_UP){
			tv.setText("当前音乐状态:开");
			mbMusic = true;
			mMIDIPlayer.PlayMusic();//播放
		}else if(keyCode==KeyEvent.KEYCODE_DPAD_DOWN){
			tv.setText("当前音乐状态:关");
			mbMusic = false;
			mMIDIPlayer.FreeMusic();
		}
		return super.onKeyDown(keyCode, event);
	}
	@Override
	protected void onPause() {
		Log.i("TAG-onPause", "onPause()");
		//取得活动的Preferences对象.
		SharedPreferences uistate = this.getPreferences(Activity.MODE_PRIVATE);
		//取得编辑对象
		SharedPreferences.Editor e = uistate.edit();
		//设置值
		e.putBoolean("bmusic", mbMusic);
		//提交
		e.commit();
		if(mbMusic){
			mMIDIPlayer.FreeMusic();//停止释放音乐.
		}
		super.onPause();
	}
	
	
}