Android学习笔记-SharedPreferences

支持多种类型的键值对存储。

1、将数据存储到SharedPreferences中

• 有三种方法可以得到SharedPreferences对象

  1. Context类中的getSharedPreferces()方法
  2. Activity类中的getPreferenes()方法
  3. PreferencesManager类中的getDefaultSharedPreferces(context)方法

• 写入数据

  1. Call edit() to get a SharedPreferences.Editor.
  2. Add values with methods such as putBoolean() and putString().
  3. Commit the new values with commit()
• 读取数据, use SharedPreferences methods such as getBoolean() and getString().

Here is an example that saves a preference for silent keypress mode in a calculator:

public class Calc extends Activity {    public static final String PREFS_NAME = "MyPrefsFile";    @Override    protected void onCreate(Bundle state){       super.onCreate(state);       . . .       // Restore preferences       SharedPreferences settings = getSharedPreferences(PREFS_NAME, 0);       boolean silent = settings.getBoolean("silentMode", false);       setSilent(silent);    }    @Override    protected void onStop(){       super.onStop();      // We need an Editor object to make preference changes.      // All objects are from android.context.Context      SharedPreferences settings = getSharedPreferences(PREFS_NAME, 0);      SharedPreferences.Editor editor = settings.edit();      editor.putBoolean("silentMode", mSilentMode);      // Commit the edits!      editor.commit();    }}

2、记住密码功能