android讀寫Preference：

android讀寫Preference：

package df.util.android;import android.app.Activity;import android.content.SharedPreferences;import android.preference.PreferenceManager;import android.util.Log;/** * Created by IntelliJ IDEA. * User: david * Date: 11-11-2 * Time: 上午10:44 * To change this template use File | Settings | File Templates. */public class PreferenceUtil {    public static final String TAG = "df.util.PreferenceUtil";    public static void saveRecord(Activity activity, final String key, String value ) {        SharedPreferences prefs = PreferenceManager.getDefaultSharedPreferences(activity);        prefs.edit().putString(key, value).commit();        Log.d(TAG, "saveRecord, " + key + " = " + value);    }    public static void saveRecord(Activity activity, final String key, int value ) {        SharedPreferences prefs = PreferenceManager.getDefaultSharedPreferences(activity);        prefs.edit().putInt(key, value).commit();        Log.d(TAG, "saveRecord, " + key + " = " + value);    }    public static void saveRecord(Activity activity, final String key, long value ) {        SharedPreferences prefs = PreferenceManager.getDefaultSharedPreferences(activity);        prefs.edit().putLong(key, value).commit();        Log.d(TAG, "saveRecord, " + key + " = " + value);    }    public static void saveRecord(Activity activity, final String key, boolean value ) {        SharedPreferences prefs = PreferenceManager.getDefaultSharedPreferences(activity);        prefs.edit().putBoolean(key, value).commit();        Log.d(TAG, "saveRecord, " + key + " = " + value);    }    public static String readRecord(Activity activity, final String key, final String defaultValue ) {        SharedPreferences prefs = PreferenceManager.getDefaultSharedPreferences(activity);        String value  = prefs.getString(key, defaultValue);        Log.d(TAG, "readRecord, " + key + " = " + value );        return value;    }    public static int readRecord(Activity activity, final String key, final int defaultValue ) {        SharedPreferences prefs = PreferenceManager.getDefaultSharedPreferences(activity);        int value  = prefs.getInt(key, defaultValue);        Log.d(TAG, "readRecord, " + key + " = " + value );        return value;    }    public static boolean readRecord(Activity activity, final String key, final boolean defaultValue ) {        SharedPreferences prefs = PreferenceManager.getDefaultSharedPreferences(activity);        boolean value  = prefs.getBoolean(key, defaultValue);        Log.d(TAG, "readRecord, " + key + " = " + value);        return value;    }}使用如下：    private boolean getPayDatabase() {        //讀取不到"this_is_my_key"時，flag為defaultValue，flag = false        boolean flag = PreferenceUtil.readRecord(this, "this_is_my_key", false);        Log.v(TAG,"getPayDatabase:" + flag);        return flag;    }    boolean createPayDatabase() {        PreferenceUtil.saveRecord(this, "this_is_my_key", true);        return true;    }