Android pre-defined Animation Resources

In the last exercise "Implement simple Fade-in Animation" and "Handle Animation event, AnimationListener", we create our own animation (fadein.xml and fadeout.xml). Actually, Android come with some pre-defined Animation Resources include android.R.anim.fade_in and android.R.anim.fade_in. Such that we can omit the creation of /res/anim/fadein.xml and /res/anim/fadeout.xml.

This exercise have the almost same effect as in the last exercise "Handle Animation event, AnimationListener".

main.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
  android:orientation="vertical"
  android:layout_width="fill_parent"
  android:layout_height="fill_parent"
  >
<TextView
  android:layout_width="fill_parent"
  android:layout_height="wrap_content"
  android:text="@string/hello"
  />
<ImageView
  android:id="@+id/image"
  android:layout_width="fill_parent"
  android:layout_height="wrap_content"
  android:src="@drawable/icon"
  />
</LinearLayout>

package com.exercise.AndroidAnimation;

import android.app.Activity;
import android.os.Bundle;
import android.view.animation.Animation;
import android.view.animation.Animation.AnimationListener;
import android.view.animation.AnimationUtils;
import android.widget.ImageView;

public class AndroidAnimationActivity extends Activity {

ImageView image;
Animation animationFadeIn, animationFadeOut;

  /** Called when the activity is first created. */
  @Override
  public void onCreate(Bundle savedInstanceState) {
      super.onCreate(savedInstanceState);
      setContentView(R.layout.main);
      image = (ImageView)findViewById(R.id.image);
    
      animationFadeIn = AnimationUtils.loadAnimation(this,
        android.R.anim.fade_in);
      animationFadeOut = AnimationUtils.loadAnimation(this,
        android.R.anim.fade_out);
      animationFadeIn.setAnimationListener(animationInListener);
      animationFadeOut.setAnimationListener(animationOutListener);
      image.startAnimation(animationFadeIn);
  }

@Override
protected void onPause() {
 // TODO Auto-generated method stub
 super.onPause();
 image.clearAnimation();
}

AnimationListener animationInListener
= new AnimationListener(){

 @Override
 public void onAnimationEnd(Animation animation) {
  // TODO Auto-generated method stub
  image.startAnimation(animationFadeOut);
 }

 @Override
 public void onAnimationRepeat(Animation animation) {
  // TODO Auto-generated method stub
 
 }

 @Override
 public void onAnimationStart(Animation animation) {
  // TODO Auto-generated method stub
 
 }};

AnimationListener animationOutListener
= new AnimationListener(){

 @Override
 public void onAnimationEnd(Animation animation) {
  // TODO Auto-generated method stub
  image.startAnimation(animationFadeIn);
 }

 @Override
 public void onAnimationRepeat(Animation animation) {
  // TODO Auto-generated method stub
 
 }

 @Override
 public void onAnimationStart(Animation animation) {
  // TODO Auto-generated method stub
 
 }};
}

Download the files.

next:
- Implement slide-in and slide-out animation