frame Animation 的小例子
frame-by-frame animation 是一个展示一连串图片的简单的动画
实现frame-by-frame animation 的步骤
A将一连串图片存放在drawable文件夹中
B define the list of frames to be animated.? the name of the file is aframe_animation.xml
<animation-list xmlns:android="http://schemas.android.com/apk/res/android"
android:oneshot="false">
<item android:drawable="@drawable/circle1" android:duration="50" />
<item android:drawable="@drawable/circle2" android:duration="50" />
<item android:drawable="@drawable/circle3" android:duration="50" />
</animation-list>
上面这个xml的作用时将这三张图片一次放映，时间间隔是50mill second
create XML Layout File for the Frame Animation Example
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:id = "@+id/textViewId1"
??? android:layout_width="fill_parent"
??? android:layout_height="wrap_content"
??? android:text="Debuge Scrath pad"
??? />
??? <Button
??? android:id = "@+id/startButtonId"
??? android:layout_width="fill_parent"
??? android:layout_height="wrap_content"
??? android:text="start animation"/>
??? <ImageView
??? android:id = "@+id/animationImage"
??? android:layout_width="fill_parent"
??? android:layout_height="wrap_content"
??? />
</LinearLayout>
the main Activity
?
package hust.ophoneclub.FrameAnimation;
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;
public class FrameAnimation extends Activity {
??? /** Called when the activity is first created. */
??? @Override
??? public void onCreate(Bundle savedInstanceState) {
??????? super.onCreate(savedInstanceState);
??????? setContentView(R.layout.main);
??????? setupButton();
??? }
?/**
? *
? */
?private void setupButton() {
??Button btn =(Button)findViewById(R.id.startButtonId);
??btn.setOnClickListener(new Button.OnClickListener(){
???@Override
???public void onClick(View v) {
????startAnimate();
???}
??});
?}
?
?private void startAnimate() {
??ImageView imageView = setBackgroundOfImageView();
??animate(imageView);
?}
?/**
? * @param imageView
? */
?private void animate(ImageView imageView) {
??AnimationDrawable frameAnimation =
???(AnimationDrawable)imageView.getBackground();
??if(frameAnimation.isRunning()){
???frameAnimation.stop();
??}else{
???frameAnimation.stop();
???frameAnimation.start();
??}
?}
?
?private ImageView setBackgroundOfImageView() {
??ImageView imageView =(ImageView)findViewById(R.id.animationImage);
??imageView.setVisibility(ImageView.VISIBLE);
??imageView.setBackgroundResource(R.drawable.frame_animation);
??return imageView;
?}
}
说明：frameAnimation是作为main.xml中的background
imageView.setBackgroundResource(R.drawable.frame_animation);
这句代码的作用是将定义frame Animation 的 xml rescourse 文件转化为一个AnimationDrwable 对象
加到imageView的背景上? 所以我们要取得这个对象来进行相关的操作
??AnimationDrawable frameAnimation =
???(AnimationDrawable)imageView.getBackground();
???这句代码就取得了这个对象；
???
最后的效果是这样的
?
