CheckableLinearLayout.java

package com.circlegate.liban.view;

import android.content.Context;
import android.os.Build.VERSION;
import android.os.Build.VERSION_CODES;
import android.util.AttributeSet;
import android.view.View;
import android.view.accessibility.AccessibilityEvent;
import android.view.accessibility.AccessibilityNodeInfo;
import android.widget.Checkable;
import android.widget.LinearLayout;

public class CheckableLinearLayout extends LinearLayout implements Checkable {
    private boolean checked;

    public CheckableLinearLayout(Context context) {
        super(context);
    }

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

    @Override
    public void setChecked(boolean checked) {
        this.checked = checked;
        for (int i = 0; i < this.getChildCount(); i++) {
            View v = this.getChildAt(i);
            if (v instanceof Checkable) {
                ((Checkable)v).setChecked(checked);
            }
        }
        refreshDrawableState();
    }

    @Override
    public boolean isChecked() {
        return checked;
    }

    @Override
    public void toggle() {
        setChecked(!checked);
    }

    @Override
    protected int[] onCreateDrawableState(int extraSpace) {
        final int[] drawableState = super.onCreateDrawableState(extraSpace + 1);
        if (isChecked()) {
            mergeDrawableStates(drawableState, CheckedStateSet);
        }
        return drawableState;
    }

    private static final int[] CheckedStateSet = {
            android.R.attr.state_checked
    };


    @Override
    public void onInitializeAccessibilityEvent(AccessibilityEvent event) {
        super.onInitializeAccessibilityEvent(event);
        event.setChecked(isChecked());
    }

    @Override
    public void onInitializeAccessibilityNodeInfo(AccessibilityNodeInfo info) {
        super.onInitializeAccessibilityNodeInfo(info);
        if (VERSION.SDK_INT >= VERSION_CODES.ICE_CREAM_SANDWICH) {
            info.setCheckable(true);
            info.setChecked(isChecked());
        }
    }
}