Android Open Source - blokish Busy Indicator

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License

The source code is released under:

GNU General Public License

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Java Source Code

package org.scoutant.blokish;
//  w  w  w . j  a va 2 s.c  om
import org.scoutant.blokish.R;

import android.content.Context;
import android.graphics.drawable.Drawable;
import android.os.Handler;
import android.view.View;
import android.view.animation.Animation;
import android.view.animation.Interpolator;
import android.view.animation.RotateAnimation;

/** 
 * An adaptation from OsmAnd project, credits to http://wiki.openstreetmap.org/wiki/OsmAnd, license GPL.
 * And I do publish present adaptation with same license, at http://github.com/scoutant.  
 */
public class BusyIndicator {
  private View view;
  private Handler uiHandler;
  private boolean visible=false;
  private Drawable drawable;
  private RotateAnimation animation;
  
  public BusyIndicator(Context ctx, View view){
    this.view = view;
    view.setVisibility(View.INVISIBLE);
    uiHandler = new Handler();
    this.drawable =  ctx.getResources().getDrawable(R.drawable.spinner_blue_76);  
    animation = new RotateAnimation(0, 360, RotateAnimation.RELATIVE_TO_SELF, 0.5f, RotateAnimation.RELATIVE_TO_SELF, 0.5f);
    animation.setRepeatCount(Animation.INFINITE);
    final int cycles = 12;
    animation.setInterpolator(new Interpolator(){
      public float getInterpolation(float input) {
        return ((int)(input * cycles)) / (float) cycles;
      }
    });
    animation.setDuration(1800);
    animation.setStartTime(RotateAnimation.START_ON_FIRST_FRAME);
    animation.setStartOffset(0);
  }
  
  public void show(){
    this.visible = true;
    uiHandler.post(new Runnable(){
      public void run() {
        view.setVisibility( View.VISIBLE);
        if(BusyIndicator.this.visible){
          view.setBackgroundDrawable(drawable);
          if(view.getAnimation() == null){
            view.startAnimation(animation);
          }
        }
      }
    });
  }
  
  public void hide(){
    this.visible = false;
    uiHandler.post(new Runnable(){
      public void run() {
        view.setVisibility(View.INVISIBLE);
        if(view.getAnimation() != null){
          view.clearAnimation();
        }
      }
    });
  }
}

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