Andorid数据存储----Shared Preferences 就像QQ的安全设置、系统设置

SPActivityMIDIPlayer

import android.app.Activity;import android.content.SharedPreferences;import android.os.Bundle;import android.view.KeyEvent;import android.widget.TextView;public class SPActivity extends Activity {    private MIDIPlayer mMIDIPlayer = null;    private boolean mbMusic = false;    private TextView mTextView = null;        @Override    public void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.main);                mTextView = (TextView)this.findViewById(R.id.TextView01);                mMIDIPlayer = new MIDIPlayer(this);        /* 装载数据 */        // 取得活动的preferences对象.        SharedPreferences settings = getPreferences(Activity.MODE_PRIVATE);                //取得值        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 = true;mMIDIPlayer.FreeMusic();break;}    return true;    }        public boolean onKeyDown(int keyCode, KeyEvent event){    if(keyCode == KeyEvent.KEYCODE_BACK){    /* 这里我们在推出应用程序时保存数据 */    // 取得活动的preferences对象.    SharedPreferences uiStata = getPreferences(0);        // 取得编辑对象    SharedPreferences.Editor editor = uiStata.edit();    // 添加值    editor.putBoolean("bmusic", mbMusic);        //提交保存    editor.commit();    if(mbMusic){    mMIDIPlayer.FreeMusic();    }    this.finish();    return true;    }    return super.onKeyDown(keyCode, event);    }}

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);//资源文件 raw文件夹中 start文件    mid格式/* 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();//停止playerMusic.release();//释放}}}