Android Open Source - android-weather-demo-application View Pager Fade

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License

The source code is released under:

GNU General Public License

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Java Source Code

package org.openweathermap.view;
//from w w  w. j a  v  a2 s . com
import android.content.Context;
import android.support.v4.view.PagerAdapter;
import android.support.v4.view.ViewPager;
import android.util.AttributeSet;
import android.view.animation.AlphaAnimation;
import android.view.animation.Animation;
import android.view.animation.Animation.AnimationListener;

/**
 * An override of the ViewPager that fades the view into the screen when
 * an adapter is set. The pager is not visible until the animation starts.
 * @author samkirton
 */
public class ViewPagerFade extends ViewPager implements AnimationListener {
  private PagerAdapter mPagerAdapter;
  private boolean mFirstLoad = true;
  
  public ViewPagerFade(Context context, AttributeSet attrs) {
    super(context, attrs);
    setVisibility(GONE);
  }

  @Override
  public void setAdapter(PagerAdapter pagerAdapter) {
    mPagerAdapter = pagerAdapter;
    // When the  view is first loaded it just needs to be faded in. All subsequent
    // loads it should fade out and then back in
    if (mFirstLoad) {
      mFirstLoad = false;
      showView();
    } else { 
      hideView();
    }
  }
  
  /**
   * Fade the layout in
   */
  public void showView() {
    super.setAdapter(mPagerAdapter);
    
    AlphaAnimation animation = new AlphaAnimation(0.0f, 1.0f);
    animation.setDuration(500);
    animation.setRepeatCount(0);
    this.startAnimation(animation);
    this.setVisibility(VISIBLE);
  }
  
  /**
   * Hides the view and when the animation ends it shows the view
   */
  public void hideView() {
    AlphaAnimation animation = new AlphaAnimation(1.0f, 0.0f);
    animation.setDuration(500);
    animation.setRepeatCount(0);
    animation.setAnimationListener(this);
    this.startAnimation(animation);
  }

  @Override
  public void onAnimationEnd(Animation animation) {
    showView();
  }

  @Override
  public void onAnimationRepeat(Animation animation) { }

  @Override
  public void onAnimationStart(Animation animation) { }
}

Java Source Code List