CheckableTextView.java

package com.rafali.flickruploader.ui.widget;

/*******************************************************************************
 * Copyright 2013 Chris Banes.
 *
 * 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.    
 *******************************************************************************/

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

import com.rafali.flickruploader2.R;

public class CheckableTextView extends TextView implements Checkable, View.OnClickListener {

	/**
	 * Interface definition for a callback to be invoked when the checked state
	 * of this View is changed.
	 */
	public static interface OnCheckedChangeListener {

		/**
		 * Called when the checked state of a compound button has changed.
		 * 
		 * @param checkableView
		 *            The view whose state has changed.
		 * @param isChecked
		 *            The new checked state of checkableView.
		 */
		void onCheckedChanged(View checkableView, boolean isChecked);
	}

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

	private boolean mChecked = false;

	private OnCheckedChangeListener mOnCheckedChangeListener;

	private OnClickListener onClickListener;

	public CheckableTextView(Context context, AttributeSet attrs) {
		super(context, attrs);
		super.setOnClickListener(this);
		setCompoundDrawablesWithIntrinsicBounds(R.drawable.checkbox_off, 0, 0, 0);
	}

	public boolean isChecked() {
		return mChecked;
	}

	public void setChecked(boolean b) {
		if (b != mChecked) {
			mChecked = b;
			setCompoundDrawablesWithIntrinsicBounds(b ? R.drawable.checkbox_on : R.drawable.checkbox_off, 0, 0, 0);
			refreshDrawableState();

			if (mOnCheckedChangeListener != null) {
				mOnCheckedChangeListener.onCheckedChanged(this, mChecked);
			}
		}
	}

	@Override
	public void setOnClickListener(OnClickListener onClickListener) {
		this.onClickListener = onClickListener;
	}

	public void toggle() {
		setChecked(!mChecked);
	}

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

	/**
	 * Register a callback to be invoked when the checked state of this view
	 * changes.
	 * 
	 * @param listener
	 *            the callback to call on checked state change
	 */
	public void setOnCheckedChangeListener(OnCheckedChangeListener listener) {
		mOnCheckedChangeListener = listener;
	}

	@Override
	public void onClick(View v) {
		toggle();
		if (onClickListener != null) {
			onClickListener.onClick(v);
		}
	}

}