Android共享偏好设置

Question

我必须使用android中的sharedpreferences类来共享首选项,并且首选项必须在两个活动之间共享.如何将这些偏好从一个活动传递到另一个活动？可以使用静态变量,但它们对我不起作用.

//code for setting shared preferences
SharedPreferences settings = getSharedPreferences(PREFS_NAME, 0);
SharedPreferences.Editor editor = settings.edit();
editor.putString("login_session_key",response.getLogin_Session_Key());
editor.putString("user_name", username.getText().toString());
editor.commit();

//code for getting shared preferences
SharedPreferences settings = getSharedPreferences(SignIn.PREFS_NAME,
                Activity.MODE_PRIVATE);
username = (TextView) findViewById(R.id.username);
String uname = settings.getString("user_name", null);
username.setText(uname);

Answer 1

您应该通过意向调用将它们传递给活动,或者您应该阅读新活动中需要的活动.

创建一个帮助程序类,处理所有活动的所有共享首选项调用.然后在需要存储/获取首选项的任何活动上实例化它的实例.

public class AppPreferences {
     public static final String KEY_PREFS_SMS_BODY = "sms_body";
     private static final String APP_SHARED_PREFS = AppPreferences.class.getSimpleName(); //  Name of the file -.xml
     private SharedPreferences _sharedPrefs;
     private Editor _prefsEditor;

     public AppPreferences(Context context) {
         this._sharedPrefs = context.getSharedPreferences(APP_SHARED_PREFS, Activity.MODE_PRIVATE);
         this._prefsEditor = _sharedPrefs.edit();
     }

     public String getSmsBody() {
         return _sharedPrefs.getString(KEY_PREFS_SMS_BODY, "");
     }

     public void saveSmsBody(String text) {
         _prefsEditor.putString(KEY_PREFS_SMS_BODY, text);
         _prefsEditor.commit();
     }
}

然后在你的活动......

public class MyActivity extends Activity {

    private AppPreferences _appPrefs;

    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        _appPrefs = new AppPreferences(getApplicationContext());
        // ...
    }
}

和

String someString = _appPrefs.getSmsBody();

要么

_appPrefs.saveSmsBody(someString);