In this article we are going to learn how to make an blinking image on touch or click.
There are following steps we need to follow to make Blinking Santa.
Step 1: Create a Project using Motodev. The options will look like this.
Step 2: in your res/drwable folder put the image santa.png
Step 3. Open the layout/Main.xml and put following codes
[xml]
[/xml]
Step 4. Open the MainActivity.java and put following codes
[xml]
package com.blinkingsanta;
import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.animation.Animation;
import android.view.animation.Animation.AnimationListener;
import android.widget.ImageView;
public class MainActivity extends Activity implements OnClickListener, AnimationListener {
private ImageView _santaImage;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
_santaImage = (ImageView) findViewById(R.id.image);
_santaImage.setOnClickListener(this);
}
@Override
public void onClick(View view) {
if (view.getId() == R.id.image) {
Animation animation;
if (_santaImage.getVisibility() == View.VISIBLE) {
animation = new VisibilityClass(3, true);
}
else
{
animation = new VisibilityClass(3, false);
}
animation.setDuration(1000L);
animation.setAnimationListener(this);
_santaImage.startAnimation(animation);
}
}
@Override
public void onAnimationEnd(Animation animation) {
_santaImage.setVisibility(View.VISIBLE);
}
@Override
public void onAnimationRepeat(Animation animation) {
}
@Override
public void onAnimationStart(Animation animation) {
}
}
[/xml]
Step 5. Create a new class VisibilityClass.java and put following codes
[xml]
package com.blinkingsanta;
import android.util.FloatMath;
import android.view.animation.Animation;
import android.view.animation.Transformation;
public class VisibilityClass extends Animation {
private int _totalNumber;
private boolean _isAnimFinished;
public VisibilityClass(int _totalNumber, boolean _isAnimFinished) {
this._totalNumber = _totalNumber;
this._isAnimFinished = _isAnimFinished;
}
@Override
protected void applyTransformation(float _interpolatedTime, Transformation _trans) {
float period = _interpolatedTime * _totalNumber * 4.12f + (_isAnimFinished ? 4.12f / 2 : 0);
_trans.setAlpha(Math.abs(FloatMath.cos(period)));
}
}
[/xml]
Step 6. Run the app and Click on Santa . It should look like this 🙂
Tags: alpha effect, An Android application, Android components, Android Game, animation in Android, Apple, Blinking effect, Game Programming, Key Event, Key Event handler, Movement, Timer, Touch, TouchEvent
