android的动画实例

package src.com;

import android.graphics.Canvas;

import android.graphics.ColorFilter;

import android.graphics.PixelFormat;

import android.graphics.drawable.Drawable;

public class ProxyDrawable extends Drawable {

private Drawable mProxy;//画图对象

public ProxyDrawable(Drawable target){//构造函数

mProxy = target;

}

public Drawable getProxy(){//获取新对象

return mProxy;

}

public void setProxy(Drawable proxy){//设置画图对象

if( proxy != this ){

mProxy = proxy;

}

}

@Override

public void draw(Canvas canvas) {//画图

if( mProxy != null ){

mProxy.draw(canvas);

}

}

@Override

public void setAlpha(int alpha) {//设置透明度

if( mProxy != null ){

mProxy.setAlpha(alpha);

}

}

@Override

public void setColorFilter(ColorFilter cf) {//设置颜色过滤

if( mProxy != null ){

mProxy.setColorFilter(cf);

}

}

@Override

public int getOpacity() {//获取透明度

//return 0;

return mProxy != null ? mProxy.getOpacity() : PixelFormat.TRANSPARENT;

}

@Override

public int getIntrinsicWidth() {//返回固有的宽度

//return super.getIntrinsicWidth();

return mProxy != null ? mProxy.getIntrinsicWidth() : -1;

}

@Override

public int getIntrinsicHeight() {//返回固有的高度

//return super.getIntrinsicHeight();

return mProxy != null ? mProxy.getIntrinsicHeight() : -1;

}

@Override

public void setDither(boolean dither) {//设置抖动

//super.setDither(dither);

if( mProxy != null ){

mProxy.setDither(dither);

}

}

@Override

public void setFilterBitmap(boolean filter) {

//super.setFilterBitmap(filter);

if( mProxy != null ){

mProxy.setDither(filter);

}

}

}

package src.com;

import android.graphics.Canvas;

import android.graphics.drawable.Drawable;

import android.view.animation.Animation;

import android.view.animation.AnimationUtils;

import android.view.animation.Transformation;

public class AnimateDrawable extends ProxyDrawable {

private Animation mAnimation;

private Transformation mTransformation = new Transformation();

public AnimateDrawable(Drawable target) {

super(target);

}

public AnimateDrawable(Drawable target, Animation animation){

super(target);

mAnimation = animation;

}

public Animation getAnimation() {

return mAnimation;

}

public void setAnimation(Animation anim){

mAnimation = anim;

}

public boolean hasStarted(){

return mAnimation != null && mAnimation.hasStarted();

}

public boolean hasEnded(){

return mAnimation != null && mAnimation.hasEnded();

}

@Override

public void draw(Canvas canvas) {

//super.draw(canvas);

Drawable dr = getProxy();

if( dr != null ){

int sc = canvas.save();

Animation anim = mAnimation;

if( anim != null ){

anim.getTransformation(

AnimationUtils.currentAnimationTimeMillis(),

mTransformation);

canvas.concat(mTransformation.getMatrix());

}

dr.draw(canvas);

canvas.restoreToCount(sc);

}

}

}

package src.com;

import android.app.Activity;

import android.content.Context;

import android.graphics.Canvas;

import android.graphics.Color;

import android.graphics.drawable.Drawable;

import android.os.Bundle;

import android.view.View;

import android.view.animation.Animation;

import android.view.animation.TranslateAnimation;

public class AnimationActivity extends Activity {

@Override

protected void onCreate(Bundle savedInstanceState) {

// TODO Auto-generated method stub

super.onCreate(savedInstanceState);

setContentView(new AnimationView(this));

}

private static class AnimationView extends View{

private AnimateDrawable mDrawable;

public AnimationView(Context context){

super(context);

Drawable pic = context.getResources().getDrawable(R.drawable.mountain);

pic.setBounds(0, 0, pic.getIntrinsicWidth(), pic.getIntrinsicHeight());

Animation move = new TranslateAnimation(0, 150, 0, 300);

move.setDuration(5000);

move.setRepeatCount(-1);

move.initialize(0, 0, 0, 0);

mDrawable = new AnimateDrawable(pic, move);

move.startNow();

}

@Override

protected void onDraw(Canvas canvas) {

//super.onDraw(canvas);

canvas.drawColor(Color.GREEN);

mDrawable.draw(canvas);

invalidate();

}

}

}