java - android 复选框首选项获取和设置 boolean 值

Question

我是 android 的初学者，我尝试制作一个带有首选项 Activity 的简单手电筒应用程序。所以我的问题是；我想让灯光和声音设置成为可选的复选框。

设置.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"
       />

设置.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;
        }
    });

我的turnOnFlash函数；

 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();
    }
}

onStart函数

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

我想由用户选择将这个 true 或 false 值设置为 onStart 周期。并且不知道如何实现。

Answer 1

如果我理解正确，你应该在 Resume() 上获得偏好并采取相应的行动:

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);
}