Android Open Source - ParallaxScroll Parallaxed View

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Back to project page ParallaxScroll.

License

The source code is released under:

MIT License

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Java Source Code

package com.nirhart.parallaxscroll.views;
// w  w  w .  j av a  2s. c o  m
import java.lang.ref.WeakReference;
import java.util.ArrayList;
import java.util.List;

import android.annotation.SuppressLint;
import android.os.Build;
import android.view.View;
import android.view.animation.AlphaAnimation;
import android.view.animation.Animation;
import android.view.animation.AnimationSet;

public abstract class ParallaxedView {
  static public boolean isAPI11 = Build.VERSION.SDK_INT >= Build.VERSION_CODES.HONEYCOMB;
  protected WeakReference<View> view;
  protected int lastOffset;
  protected List<Animation> animations;

  abstract protected void translatePreICS(View view, float offset);
  
  public ParallaxedView(View view) {
    this.lastOffset = 0;
    this.animations = new ArrayList<Animation>();
    this.view = new WeakReference<View>(view);
  }

  public boolean is(View v) {
    return (v != null && view != null && view.get() != null && view.get().equals(v));
  }

  @SuppressLint("NewApi")
  public void setOffset(float offset) {
    View view = this.view.get();
    if (view != null)
      if (isAPI11) {
        view.setTranslationY(offset);
      } else {
        translatePreICS(view, offset);
      }
  }

  public void setAlpha(float alpha) {
    View view = this.view.get();
    if (view != null)
      if (isAPI11) {
        view.setAlpha(alpha);
      } else {
        alphaPreICS(view, alpha);
      }
  }
  
  protected synchronized void addAnimation(Animation animation) {
    animations.add(animation);
  }
  
  protected void alphaPreICS(View view, float alpha) {
    addAnimation(new AlphaAnimation(alpha, alpha));
  }
  
  protected synchronized void animateNow() {
    View view = this.view.get();
    if (view != null) {
      AnimationSet set = new AnimationSet(true);
      for (Animation animation : animations)
        if (animation != null)
          set.addAnimation(animation);
      set.setDuration(0);
      set.setFillAfter(true);
      view.setAnimation(set);
      set.start();
      animations.clear();
    }
  }
  
  public void setView(View view) {
    this.view = new WeakReference<View>(view);
  }
}

Java Source Code List