Android Open Source - Go2-Rennes Expandable View

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License

The source code is released under:
GNU General Public License
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Java Source Code

/*******************************************************************************
 * Copyright (c) 2011 Michel DAVID mimah35-at-gmail.com
 * /*from  ww w  . j av a  2s . co  m*/
 * 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;
  }
}
Java Source Code List
