小弟我的Android进阶之旅->Android之动画之Frame Animation实例

我的Android进阶之旅------>Android之动画之Frame Animation实例

============================首先看看官网上关于Frame animation的介绍================================

地址：http://developer.android.com/guide/topics/resources/animation-resource.html#Frame

Frame animation

An animation defined in XML that shows a sequence of images in order (like a film).

FILE LOCATION:

res/drawable/filename.xml
The filename will be used as the resource ID.

COMPILED RESOURCE DATATYPE:

Resource pointer to an AnimationDrawable.

RESOURCE REFERENCE:

In Java: R.drawable.filename
In XML: @[package:]drawable.filename

SYNTAX:

<?xml version="1.0" encoding="utf-8"?><animation-list xmlns:android="http://schemas.android.com/apk/res/android"    android:oneshot=["true" | "false"] >    <item        android:drawable="@[package:]drawable/drawable_resource_name"        android:duration="integer" /></animation-list>

ELEMENTS:

<animation-list>

Required. This must be the root element. Contains one or more <item> elements.

attributes:

android:oneshot

Boolean. "true" if you want to perform the animation once; "false" to loop the animation.

<item>

A single frame of animation. Must be a child of a <animation-list> element.

attributes:

android:drawable

Drawable resource. The drawable to use for this frame.android:duration

Integer. The duration to show this frame, in milliseconds.

============================下面通过一个小案例来学习Frame animation================================

 step1:新建一个Android项目FrameAnimationDemo

step2:准备好该应用使用的图片，用来做Frame Animation的，并将动画放入drawable目录下

step3:新建一个用来描述Frame动画的xml文件，res/anim/frame.xml

package cn.oyp.frame;import android.app.Activity;import android.graphics.drawable.AnimationDrawable;import android.graphics.drawable.Drawable;import android.os.Bundle;import android.view.View;import android.widget.ImageView;public class FrameActivity extends Activity {// 显示动画的组件private ImageView imgDance;// Frame动画private AnimationDrawable animDance;/** Called when the activity is first created. */@Overridepublic void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.main);// 实例化组件imgDance = (ImageView) super.findViewById(R.id.ImgDance);}/** * 如果在onCreate()中调用AnimationDrawable的start()方法，则它只停留在第一帧，并没有出现我们期望的动画， * 这是因为窗口Window对象还没有完全初始化，AnimationDrawable不能完全追加到窗口Window对象中。 * 而onWindowFocusChanged是在onCreate之后被调用的，当Activity展示给用户时，onWindowFocusChanged方法就会被调用，  * 所以在这儿调用AnimationDrawable的start()方法可以实现动画效果。 */@Overridepublic void onWindowFocusChanged(boolean hasFocus) {super.onWindowFocusChanged(hasFocus);// 将动画资源文件res/anim/frame.xml设置为ImageView的背景imgDance.setBackgroundResource(R.anim.frame);// 获取ImageView背景,此时已被编译成AnimationDrawableanimDance = (AnimationDrawable) imgDance.getBackground();animDance.start();}/** * 按钮：停止‘跳舞’动画 */public void stopFrame(View view) {animDance = (AnimationDrawable) imgDance.getBackground();if (animDance.isRunning()) { // 如果正在运行,就停止animDance.stop();}}/** * 按钮：开始‘跳舞’动画 */public void runFrame(View view) {// 完全编码实现的动画效果animDance = new AnimationDrawable();for (int i = 1; i <= 6; i++) {// 根据资源名称和目录获取R.java中对应的资源IDint id = getResources().getIdentifier("p" + i, "drawable",getPackageName());// 根据资源ID获取到Drawable对象Drawable drawable = getResources().getDrawable(id);// 将此帧添加到AnimationDrawable中animDance.addFrame(drawable, 500);}animDance.setOneShot(false); // 设置为loopimgDance.setBackgroundDrawable(animDance); // 将动画设置为ImageView背景animDance.start(); // 开始动画}}

效果如下： 

                  

                

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  作者：欧阳鹏  欢迎转载，与人分享是进步的源泉！

  转载请保留原文地址：http://blog.csdn.net/ouyang_peng

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