Android example source code file (CheckableRelativeLayout.java)

This example Android source code file (CheckableRelativeLayout.java) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Android by Example" ^TM.

Java - Android tags/keywords

android, attributeset, checkablerelativelayout, checked_state_set, content, override, ui, util, utilities, utils, widget

The CheckableRelativeLayout.java Android example source code

package com.example.android.rings_extended;

import android.content.Context;
import android.util.AttributeSet;
import android.widget.Checkable;
import android.widget.RelativeLayout;

/**
 * A special variation of RelativeLayout that can be used as a checkable object.
 * This allows it to be used as the top-level view of a list view item, which
 * also supports checking.  Otherwise, it works identically to a RelativeLayout.
 */
public class CheckableRelativeLayout extends RelativeLayout implements Checkable {
    private boolean mChecked;

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

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

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

    public void toggle() {
        setChecked(!mChecked);
    }
    
    public boolean isChecked() {
        return mChecked;
    }

    public void setChecked(boolean checked) {
        if (mChecked != checked) {
            mChecked = checked;
            refreshDrawableState();
        }
    }
}