SharedPreferences如何與UpdateUI？

我是開發android應用程序的noob。我想問一下。我的PreferenceActivity如何更新而無需返回MainActivity並再次轉到PreferenceActivity。在這裏，我給了一些功能來改變PreferenceActivity的主題。這是我的PreferenceActivity：SharedPreferences如何與UpdateUI？

公共類SettingsPreference擴展PreferenceActivity {

SwitchPreference themeSwitch; 
String myPref = "preferences"; 
SharedPreferences.Editor editor; 
String summary; 
int theme; 

@Override 
public void onCreate(Bundle savedInstanceState) 
{ 
    // TODO: Implement this method 
    final SharedPreferences.Editor editor = getSharedPreferences(myPref, MODE_PRIVATE).edit(); 

    final SharedPreferences prefs = getSharedPreferences(myPref, MODE_PRIVATE); 
    final String summary = prefs.getString("stringSummary", "Default theme"); 
    final int theme = prefs.getInt("intTheme", (android.R.style.Theme_DeviceDefault_Light)); 

    setTheme(theme); 

    super.onCreate(savedInstanceState); 
    addPreferencesFromResource(R.xml.settings_preference); 

    themeSwitch = (SwitchPreference) findPreference("switchTheme"); 
    themeSwitch.setSummary(summary); 

    if (themeSwitch != null) { 
     themeSwitch.setOnPreferenceChangeListener(new Preference.OnPreferenceChangeListener() { 
       @Override 
       public boolean onPreferenceChange(Preference arg0, Object isOnObject) { 
        boolean isThemeOn = (Boolean) isOnObject; 
        if (isThemeOn) { 
         Toast.makeText(SettingsPreference.this, "Theme Dark ON", Toast.LENGTH_SHORT).show(); 
         editor.putString("stringSummary", "Theme Dark ON"); 
         editor.putInt("intTheme", (android.R.style.Theme_DeviceDefault)); 
         editor.apply(); 
         themeSwitch.setSummary(summary); 

        } else { 
         Toast.makeText(SettingsPreference.this, "Theme Dark OFF", Toast.LENGTH_SHORT).show(); 
         editor.putString("stringSummary", "Theme Dark OFF"); 
         editor.putInt("intTheme", (android.R.style.Theme_DeviceDefault_Light)); 
         editor.apply(); 
         themeSwitch.setSummary(summary); 

        } 
        return true; 
       } 
      }); 
    } 
}

}

來源

2016-11-04 M. Bagus Prasetyo

如果你有每20秒例如更新，這是代碼：

import android.os.Handler; 

    Handler handler = new Handler(); 
    handler.postDelayed(new Runnable() { 
     @Override 
     public void run() { 
      //update UI 
     } 
    },2000);

認沽這在一個函數中並在運行中重新調用。

來源

2016-11-04 19:16:42

如果更改活動佈局，您只需重新啓動即可。嘗試在onPreferenceChange（）的末尾添加此項。

如果您在API11 +中，請在活動中調用。

this.recreate();

否則，我們只需要完成活動並以相同的意圖重新開始。

Intent intent = getIntent(); 
finish(); 
startActivity(intent);

來源

2016-11-04 19:53:02

SharedPreferences如何與UpdateUI？

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