Wednesday, January 25, 2012

Create AnimationDrawable using Java code

In previous exercises, the AnimationDrawable was created using XML. It can be created using Java code also.

Create AnimationDrawable using Java code

Same as previous exercise, you have to copy some graphic in /res/drawable folder, refer to the post "Create frame animation with AnimationDrawable".

Modify main.xml, add a ImageView with predefined layout_width and android:layout_height.
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:orientation="vertical" >

<TextView
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="@string/hello" />
<TextView
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="Set Alpha" />
<SeekBar
android:id="@+id/setalpha"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:progress="255"
android:max="255" />
<Button
android:id="@+id/startanimation"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="Start Animation" />
<Button
android:id="@+id/stopanimation"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="Stop Animation" />
<ImageView
android:id="@+id/myanimation"
android:layout_width="114dp"
android:layout_height="16dp"
/>
</LinearLayout>


Modify the code of the activity.
package com.exercise.AndroidAnimation;

import android.app.Activity;
import android.graphics.drawable.AnimationDrawable;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.ImageView;
import android.widget.SeekBar;

public class AndroidAnimationActivity extends Activity {
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);

ImageView myAnimation = (ImageView)findViewById(R.id.myanimation);

//Create a new AnimationDrawable
final AnimationDrawable myAnimationDrawable
= createAnimationDrawable();

//apply the new AnimationDrawable
myAnimation.setImageDrawable(myAnimationDrawable);

SeekBar setAnimationAlpha = (SeekBar)findViewById(R.id.setalpha);
Button startAnimation = (Button)findViewById(R.id.startanimation);
Button stopAnimation = (Button)findViewById(R.id.stopanimation);

startAnimation.setOnClickListener(new Button.OnClickListener(){

@Override
public void onClick(View arg0) {
// TODO Auto-generated method stub
if(!myAnimationDrawable.isRunning()){
myAnimationDrawable.start();
}
}});

stopAnimation.setOnClickListener(new Button.OnClickListener(){

@Override
public void onClick(View arg0) {
// TODO Auto-generated method stub
if(myAnimationDrawable.isRunning()){
myAnimationDrawable.stop();
}
}});

setAnimationAlpha.setOnSeekBarChangeListener(new SeekBar.OnSeekBarChangeListener(){

@Override
public void onProgressChanged(SeekBar seekBar, int progress,
boolean fromUser) {
myAnimationDrawable.setAlpha(progress);
}

@Override
public void onStartTrackingTouch(SeekBar seekBar) {
// TODO Auto-generated method stub

}

@Override
public void onStopTrackingTouch(SeekBar seekBar) {
// TODO Auto-generated method stub

}});

}

private AnimationDrawable createAnimationDrawable(){

AnimationDrawable newAnim = new AnimationDrawable();

newAnim.addFrame(getResources().getDrawable(R.drawable.android_1), 500);
newAnim.addFrame(getResources().getDrawable(R.drawable.android_2), 500);
newAnim.addFrame(getResources().getDrawable(R.drawable.android_3), 500);
newAnim.addFrame(getResources().getDrawable(R.drawable.android_4), 500);
newAnim.addFrame(getResources().getDrawable(R.drawable.android_5), 500);
newAnim.addFrame(getResources().getDrawable(R.drawable.android_6), 500);
newAnim.addFrame(getResources().getDrawable(R.drawable.android_7), 500);
newAnim.setOneShot(false);

return newAnim;
}

}


Download the files.

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