Question

我是Android的初学者，我尝试制作一个带有偏好活动的简单手电筒应用。所以我的问题是;我想通过复选框使灯光和声音设置可选。

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;
        }
    });

我的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();
    }
}

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);
}

我想通过用户选择将此true或false值设置为onStart循环。并且不知道如何实现此实现。

Answer 1

如果我理解正确，你应该获得onResume（）的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);
}

Answer 2

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);

android复选框首选项获取并设置布尔值

2 个答案: