android复选框首选项获取并设置布尔值

Question

我是Android的初学者，我尝试使用首选项活动制作简单的手电筒应用程序。所以我的问题是;我想让光线和声音设置可选，并带有复选框。

的settings.xml

<PreferenceCategory 
    android:title="@string/sct_behaviour"> 

    <CheckBoxPreference 
     android:key="pref_light" 
     android:title="@string/st_pref_light" 
     android:summary="@string/ss_pref_light" 
     android:defaultValue="true" 
     /> 
    <CheckBoxPreference 
     android:key="pref_switch_sound" 
     android:title="@string/st_pref_sound" 
     android:summary="@string/ss_pref_sound" 
     android:defaultValue="true" 
     /> 
    <CheckBoxPreference 
     android:key="pref_notification_sound" 
     android:title="@string/st_pref_notification_sound" 
     android:summary="@string/ss_pref_notification_sound" 
     android:defaultValue="true" 
     /> 

settings.java

public class Settings extends PreferenceActivity{ 

@SuppressWarnings("deprecation") 
@Override 
public void onCreate(Bundle savedInstanceState){ 
    super.onCreate(savedInstanceState); 
    addPreferencesFromResource(R.xml.settings); 

    CheckBoxPreference pLight = (CheckBoxPreference)getPreferenceManager().findPreference("pref_light"); 

    pLight.setOnPreferenceChangeListener(new OnPreferenceChangeListener() { 

     @Override 
     public boolean onPreferenceChange(Preference preference, Object newValue) { 

      boolean myValue = (Boolean) newValue; 

      if(myValue){ 
      } 

        //NEED SOME HELP IN THERE 


      return true; 
     } 
    }); 

我turnOnFlash功能;

private void turnOnFlash() { 
    if (!isFlashOn) { 
     if (camera == null || params == null) { 
      return; 
     } 

     params = camera.getParameters(); 
     params.setFlashMode(Parameters.FLASH_MODE_TORCH); 
     camera.setParameters(params); 
     camera.startPreview(); 
     isFlashOn = true; 

     // changing button/switch image 
     toggleButtonImage(); 

    // play sound 
     playSound(); 
    } 
} 

在onStart功能

@Override 
protected void onStart() { 
    super.onStart(); 
    if(VERBOSE) Log.v(TAG, "++ ON START ++"); 
    // on starting the app get the camera params 
    getCamera(); 
turnOnFlash(value); 
} 

我想通过用户的选择来设置此true或false值在onStart周期。并不知道如何做这个实现。

Answer 1

我认为你应该使用; clicklistener

Preference pLight = (Preference)findPreference("pref_light"); 
    Preference pSwitchSound = (Preference)findPreference("pref_switch_sound"); 
    Preference pNotificationSound = (Preference)findPreference("pref_notification_sound"); 

    pLight.setOnPreferenceClickListener(this); 
    pSwitchSound.setOnPreferenceClickListener(this); 
    pNotificationSound.setOnPreferenceClickListener(this); 

Answer 2

如果我理解正确的话，你应该得到优先的onResume（），并采取相应的行动：

protected void onResume() { 
    super.onResume(); 
    if(VERBOSE) Log.v(TAG, "++ ON START ++"); 
    // on starting the app get the camera params 

    SharedPreferences prefs = PreferenceManager.getDefaultSharedPreferences(getApplicationContext()); 
    boolean lightPref = prefs.getBoolean("pref_light", true); 
    getCamera(); 
    turnOnFlash(lightPref); 
}