Question

任何想法为什么在PreferenceScreen中有多个SwitchPreferences会产生一个问题，如果你选择任何一个框，它会导致其他框改变？在运行4.2.2的Nexus 4上进行测试但在运行4.0.4的Galaxy S3上进行测试时会出现此问题。感谢您提供的任何帮助。

<?xml version="1.0" encoding="utf-8"?>

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

    <SwitchPreference
            android:key="use_gallery"
            android:title="@string/title_use_gallery_preference"
            android:summaryOff="@string/summary_dont_use_gallery_as_photo_source"
            android:summaryOn="@string/summary_use_gallery_as_photo_source"
            android:defaultValue="true"
   />

    <SwitchPreference
            android:key="use_camera"
            android:title="@string/title_use_camera_preference"
            android:summaryOff="@string/summary_dont_use_camera_as_photo_source"
            android:summaryOn="@string/summary_use_camera_as_photo_source"
            android:defaultValue="true"
  />
  <SwitchPreference
            android:key="show_last_vin"
            android:title="@string/pref_string"
            android:summaryOff="@string/pref_display__false"
            android:summaryOn="@string/pref_display_true"
            android:defaultValue="true"
  />
 </PreferenceCategory>
<PreferenceCategory android:title="@string/description_photo_quality_settings">
    <ListPreference
        android:key="prefPhotoQuality"
        android:entries="@array/photo_quality_settings"
        android:summary="@string/pref_user_photo_quality_settings"
        android:entryValues="@array/photo_quality_settings_values"
        android:title="@string/description_photo_quality_settings" />
</PreferenceCategory>

Answer 1

这似乎是this SO post报告的已知问题。

有一种解决方法，可以找到here。

以下是解决方法代码：

public class CustomSwitchPreference extends SwitchPreference {

    /**
     * Construct a new SwitchPreference with the given style options.
     *
     * @param context The Context that will style this preference
     * @param attrs Style attributes that differ from the default
     * @param defStyle Theme attribute defining the default style options
     */
    public CustomSwitchPreference(Context context, AttributeSet attrs, int defStyle) {
        super(context, attrs, defStyle);
    }

    /**
     * Construct a new SwitchPreference with the given style options.
     *
     * @param context The Context that will style this preference
     * @param attrs Style attributes that differ from the default
     */
    public CustomSwitchPreference(Context context, AttributeSet attrs) {
        super(context, attrs);
    }

    /**
     * Construct a new SwitchPreference with default style options.
     *
     * @param context The Context that will style this preference
     */
    public CustomSwitchPreference(Context context) {
        super(context, null);
    }

    @Override
    protected void onBindView(View view) {
        // Clean listener before invoke SwitchPreference.onBindView
        ViewGroup viewGroup= (ViewGroup)view;
        clearListenerInViewGroup(viewGroup);
        super.onBindView(view);
    }

    /**
     * Clear listener in Switch for specify ViewGroup.
     *
     * @param viewGroup The ViewGroup that will need to clear the listener.
     */
    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);
            }
        }
    }

}

Android SwitchPreference在4.2.2中无法正常工作

1 个答案: