Implement simple Fade-in Animation

Create /res/anim/fadein.xml to define the fade-in animation

<?xml version="1.0" encoding="utf-8"?>
<set xmlns:android="http://schemas.android.com/apk/res/android"
android:shareInterpolator="false">
<alpha android:fromAlpha="0.0"
  android:toAlpha="1.0"
  android:duration="5000">
</alpha>
</set>

main.xml layout

<?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="fill_parent"
   android:scaleType="centerCrop"
   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.AnimationUtils;
import android.widget.ImageView;

public class AndroidAnimationActivity extends Activity {

ImageView image;

   /** 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);
      
       Animation animationFadeIn = AnimationUtils.loadAnimation(this, R.anim.fadein);
       image.startAnimation(animationFadeIn);
   }

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

Download the files.



next:
- Handle Animation event, AnimationListener.
- Android pre-defined Animation Resources