具有自定义布局的SwitchPreference监听器

Question

我正在尝试在"设置"页面中使用SwitchPreference,但我无法让侦听器工作.我正在使用自定义小部件布局来设置切换样式,因为我找不到如何使用主题来实现这一点.在我的settings.xml中,我有以下内容:

<SwitchPreference
            android:key="uitestmode"
            android:summary="Enable to display test data in fragments"
            android:title="UI Test Mode"
            android:widgetLayout="@layout/widget_custom_switch_on_off" >
</SwitchPreference>

我的SettingsFragment看起来像:

SwitchPreference uiTestModePref = (SwitchPreference) findPreference("uitestmode");
uiTestModePref.setOnPreferenceChangeListener(new OnPreferenceChangeListener() {

    @Override
    public boolean onPreferenceChange(Preference preference, Object newValue) {
        Log.d(preference.getKey(), newValue.toString());
        return false;
    }
});

和我的交换机的自定义布局:

<?xml version="1.0" encoding="utf-8"?>
<Switch xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@+id/custom_switch_item"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:gravity="center_vertical"
    android:textColor="@android:color/white"
    android:textIsSelectable="false"
    android:textSize="18sp"
    android:textOn="On"
    android:textOff="Off"
    android:textStyle="bold"
    android:thumb="@drawable/carcast_switch_inner_holo_dark"
    android:track="@drawable/carcast_switch_track_holo_dark" />

我遇到的问题是,当我单击开关时,不会调用侦听器.有谁知道为什么以及如何解决它？

Answer 1

我遇到了同样的问题,我的解决方案类似于以下内容:

1. 在自定义开关布局中,添加以下代码.这"揭示"了偏好,并使整个块可以点击.这就是听众根本没有被触发的原因.

   android:clickable ="false"android:focusable ="false"

2. 扩展"SwitchPreference",在"onBindView"类中,从SharedPreferences获取状态,并在那里处理开关状态的变化.

   public class MySwitchPreference extends SwitchPreference {
   
       public MySwitchPreference(Context context) {
           super(context, null);
       }
   
       public MySwitchPreference(Context context, AttributeSet attrs) {
           super(context, attrs);
       }
       public MySwitchPreference(Context context, AttributeSet attrs, int defStyle) {
           super(context, attrs, defStyle);
       }
   
       protected void onBindView(View view) {
           // Clean listener before invoke SwitchPreference.onBindView
           ViewGroup viewGroup= (ViewGroup)view;
           clearListenerInViewGroup(viewGroup);
           super.onBindView(view);
   
           final Switch mySwitch = (Switch) view.findViewById(R.id.custom_switch_item);
           Boolean initVal = this.getPersistedBoolean(false);
           if (initVal) {
               mySwitch.setChecked(true);
           }
           this.setOnPreferenceChangeListener(new OnPreferenceChangeListener() {
               @Override
               public boolean onPreferenceChange(Preference preference, Object newValue) {
                   //Do your things here, toggling the switch and so on
                   return true;
               }
           });
       }
   
       private void clearListenerInViewGroup(ViewGroup viewGroup) {
           if (null == viewGroup) {
               return;
           }
   
           int count = viewGroup.getChildCount();
           for(int n = 0; n < count; ++n) {
               View childView = viewGroup.getChildAt(n);
               if(childView instanceof Switch) {
                   final Switch switchView = (Switch) childView;
                   switchView.setOnCheckedChangeListener(null);
                   return;
               } else if (childView instanceof ViewGroup){
                   ViewGroup childGroup = (ViewGroup)childView;
                   clearListenerInViewGroup(childGroup);
               }
           }
       }
   }
   

希望这可以帮助你.在我用这种方式解决之前,我无法为我的案例找到任何解决方案.