CustomSwitchPreference.java

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/*
 * Copyright 2017 Intermodalics All Rights Reserved.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package eu.intermodalics.tango_ros_streamer.android;

import android.content.Context;
import android.preference.SwitchPreference;
import android.util.AttributeSet;
import android.view.View;
import android.view.ViewGroup;
import android.widget.Switch;

/*
 * This CustomSwitchPreference is a workaround for the SwitchPreference bug in Android 4.4
 * (version used by the Tango Development Kit device): having multiple SwitchPreference is not
 * working properly in this Android version, i.e. when switching one preference the other one also
 * switches.
 * source:
 * http://stackoverflow.com/questions/17664259/android-switchpreference-not-working-correctly-in-4-2-2
 */
public class CustomSwitchPreference extends SwitchPreference {

    public CustomSwitchPreference(Context context, AttributeSet attrs, int defStyle) {
        super(context, attrs, defStyle);
    }

    public CustomSwitchPreference(Context context, AttributeSet attrs) {
        super(context, attrs);
    }

    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);
    }

    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);
            }
        }
    }

}