ExpandableView.java

/*******************************************************************************
 * Copyright (c) 2011 Michel DAVID mimah35-at-gmail.com
 * 
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License.
 * 
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 * 
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 ******************************************************************************/
package fr.gotorennes.view;

import android.app.Activity;
import android.content.Context;
import android.content.Intent;
import android.os.Handler;
import android.os.Message;
import android.util.AttributeSet;
import android.view.View;
import android.view.animation.AlphaAnimation;
import android.view.animation.Animation;
import android.view.animation.Animation.AnimationListener;
import android.widget.ImageView;
import android.widget.LinearLayout;
import android.widget.TextView;
import fr.gotorennes.R;
import fr.gotorennes.util.BackgroundTask;

public class ExpandableView extends LinearLayout {

	private boolean executed = false;
	private boolean showing = false;
	private ImageView expandIcon;

	private BackgroundTask<?> backgroundTask;
	private Intent intent;

	public ExpandableView(final Context context, AttributeSet attrs) {
		super(context, attrs);
		setOrientation(VERTICAL);

		final View view = inflate(context, R.layout.expandableview_title, null);

		ImageView imageView = (ImageView) view.findViewById(R.id.icon);
		imageView.setImageResource(attrs.getAttributeResourceValue(null, "icon", 0));

		TextView textView = (TextView) view.findViewById(R.id.title);
		textView.setText(attrs.getAttributeResourceValue(null, "title", 0));

		expandIcon = (ImageView) view.findViewById(R.id.expand);
		final boolean link = attrs.getAttributeBooleanValue(null, "link", false);
		if(link) {
			expandIcon.setImageResource(R.drawable.arrow_right_float);
		}
		addView(view);

		view.setOnClickListener(new OnClickListener() {

			@Override
			public void onClick(View paramView) {

				if(link) {
					context.startActivity(intent);
				}
				else {
					final View innerView = getChildAt(1);
	
					if (!executed && backgroundTask != null) {
							backgroundTask.addHandler(new Handler() {
								@Override
								public void handleMessage(Message message) {
									executed = true;
									showing = true;
									expandIcon.setImageResource(android.R.drawable.arrow_up_float);
									show(innerView);
								}
							});
						backgroundTask.start((Activity) getContext());
					} else {
						if (showing) {
							expandIcon.setImageResource(android.R.drawable.arrow_down_float);
							hide(innerView);
						} else {
							expandIcon.setImageResource(android.R.drawable.arrow_up_float);
							show(innerView);
						}
						showing = !showing;
					}
				}
			}
		});

	}

	protected void show(final View view) {
		AlphaAnimation showing = new AlphaAnimation(0, 1);
		showing.setDuration(500);
		showing.setAnimationListener(new AnimationListener() {

			@Override
			public void onAnimationEnd(Animation animation) {
			}

			@Override
			public void onAnimationRepeat(Animation animation) {
			}

			@Override
			public void onAnimationStart(Animation animation) {
				view.setVisibility(VISIBLE);
			}

		});
		view.setAnimation(showing);
	}

	protected void hide(final View view) {
		AlphaAnimation hiding = new AlphaAnimation(1, 0);
		hiding.setDuration(500);
		hiding.setAnimationListener(new AnimationListener() {

			@Override
			public void onAnimationEnd(Animation animation) {
				view.setVisibility(GONE);
			}

			@Override
			public void onAnimationRepeat(Animation animation) {
			}

			@Override
			public void onAnimationStart(Animation animation) {
			}

		});
		view.setAnimation(hiding);
	}

	public void reset() {

		executed = false;
		showing = false;

		getChildAt(1).setVisibility(GONE);

		expandIcon.setImageResource(android.R.drawable.arrow_down_float);
	}

	public void setBackgroundTask(BackgroundTask<?> backgroundTask) {
		this.backgroundTask = backgroundTask;
	}
	
	public void setIntent(Intent intent) {
		this.intent = intent;
	}
}