Android PreferenceActivity實例

Question

如何查找由框架創建的PreferenceActivity實例？

* * *

我的第一課。

/** This is MyAppSettings class, The instance of this class will be created by a framework **/ 

public class MyAppSettings extends PreferenceActivity { 
    protected MySeekBarPreference mSeekBarPref; 

    @Override 
    protected void onCreate(Bundle icicle) { 
     super.onCreate(icicle); 
     addPreferencesFromResource(R.xml.prefs); 

     mSeekBarPref = (MySeekBarPreference)super.findPreference("my_key"); 
    } 
} 

* * *

我的第二類。

public class MySeekBarPreference extends DialogPreference implements SeekBar.OnSeekBarChangeListener { 

     // in whis code I need to get the instance of the MyAppSettings, which was 
     // created by Android framework. (I paste a hypothetical func getTheInstanceOfMyAppSettings() :)) 
    private MyAppSettings mAppSettings = getTheInstanceOfMyAppSettings(); 

我可以通過ID或其他東西找到它嗎？

Answer 1

我猜你正在尋找getPreferenceScreen()

你可以用它來修改在XML中定義的PreferenceScreen。

例如：

private void disableHardKeyboardOptions() { 
    Preference pref = getPreferenceScreen().findPreference("pref_hardkeyboard_option"); 
    pref.setEnabled(false); 
    pref.setSummary(custom.getString(R.string.pref_no_hardkeyboard)); 
}