Checkable Linear Layout

CheckableLinearLayout.java

import android.content.Context;
import android.util.AttributeSet;
import android.view.View;
import android.widget.Checkable;
import android.widget.LinearLayout;

import java.util.HashSet;
import java.util.Set;

public class CheckableLinearLayout extends LinearLayout implements Checkable {
    private static final int[] CHECKED_STATE_SET = {android.R.attr.state_checked};
    private OnCheckedChangeListener onCheckedChangeListener;
    private final Set<Checkable> checkableSet = new HashSet<>();
    private boolean checked;

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

    public CheckableLinearLayout(Context context) {
        this(context, null);
    }

    @Override
    protected void onFinishInflate() {
        super.onFinishInflate();
        final int childCount = getChildCount();
        for (int i = 0; i < childCount; ++i) {
            final View v = getChildAt(i);
            if (v instanceof Checkable) {
                checkableSet.add((Checkable) v);
            }
        }
    }

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

    @Override
    public void setChecked(boolean checked) {
        if (checked == this.checked) {
            return;
        }

        this.checked = checked;
        for (Checkable checkable : checkableSet) {
            checkable.setChecked(checked);
        }

        refreshDrawableState();

        if (onCheckedChangeListener != null) {
            onCheckedChangeListener.onCheckedChanged(this, checked);
        }
    }

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

    @Override
    public boolean performClick() {
        toggle();
        return super.performClick();
    }

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

    public void setOnCheckedChangeListener(OnCheckedChangeListener onCheckedChangeListener) {
        this.onCheckedChangeListener = onCheckedChangeListener;
    }

    public interface OnCheckedChangeListener {
        void onCheckedChanged(CheckableLinearLayout currentView, boolean isChecked);
    }
}