Android Drawable Animation 学习

Drawable Animation（Frame Animation） Drawable Animation（Frame Animation）：帧动画，就像GIF图片，通过一系列Drawable依次显示来模拟动画的效果。在XML中的定义方式如下：

<?xml version="1.0" encoding="utf-8"?><animation-list android:oneshot="false"  xmlns:android="http://schemas.android.com/apk/res/android">    <item android:duration="400" android:drawable="@drawable/send_loading1" />    <item android:duration="400" android:drawable="@drawable/send_loading2" />    <item android:duration="400" android:drawable="@drawable/send_loading3" />    <item android:duration="400" android:drawable="@drawable/send_loading4" />    <item android:duration="400" android:drawable="@drawable/send_loading5" />    <item android:duration="400" android:drawable="@drawable/send_loading1" /></animation-list>

下面通过一个例子演示其作用

目录结构

common_loading_animation.xml

<?xml version="1.0" encoding="utf-8"?><animation-list android:oneshot="false"  xmlns:android="http://schemas.android.com/apk/res/android">    <item android:duration="400" android:drawable="@drawable/send_loading1" />    <item android:duration="400" android:drawable="@drawable/send_loading2" />    <item android:duration="400" android:drawable="@drawable/send_loading3" />    <item android:duration="400" android:drawable="@drawable/send_loading4" />    <item android:duration="400" android:drawable="@drawable/send_loading5" />    <item android:duration="400" android:drawable="@drawable/send_loading1" /></animation-list>

horizontal_loading_animation.xml

<?xml version="1.0" encoding="utf-8"?><animation-list android:oneshot="false"  xmlns:android="http://schemas.android.com/apk/res/android">    <item android:duration="400" android:drawable="@drawable/progressbar_indeterminate_holo1" />    <item android:duration="400" android:drawable="@drawable/progressbar_indeterminate_holo2" />    <item android:duration="400" android:drawable="@drawable/progressbar_indeterminate_holo3" />    <item android:duration="400" android:drawable="@drawable/progressbar_indeterminate_holo4" />    <item android:duration="400" android:drawable="@drawable/progressbar_indeterminate_holo4" />    <item android:duration="400" android:drawable="@drawable/progressbar_indeterminate_holo5" />    <item android:duration="400" android:drawable="@drawable/progressbar_indeterminate_holo6" />    <item android:duration="400" android:drawable="@drawable/progressbar_indeterminate_holo7" />    <item android:duration="400" android:drawable="@drawable/progressbar_indeterminate_holo8" />    <item android:duration="400" android:drawable="@drawable/progressbar_indeterminate_holo9" />    <item android:duration="400" android:drawable="@drawable/progressbar_indeterminate_holo10" />    <item android:duration="400" android:drawable="@drawable/progressbar_indeterminate_holo11" />    <item android:duration="400" android:drawable="@drawable/progressbar_indeterminate_holo12" />    <item android:duration="400" android:drawable="@drawable/progressbar_indeterminate_holo13" />    <item android:duration="400" android:drawable="@drawable/progressbar_indeterminate_holo14" />    <item android:duration="400" android:drawable="@drawable/progressbar_indeterminate_holo15" />    <item android:duration="400" android:drawable="@drawable/progressbar_indeterminate_holo16" />    <item android:duration="400" android:drawable="@drawable/progressbar_indeterminate_holo17" />    <item android:duration="400" android:drawable="@drawable/progressbar_indeterminate_holo18" />    <item android:duration="400" android:drawable="@drawable/progressbar_indeterminate_holo19" />    <item android:duration="400" android:drawable="@drawable/progressbar_indeterminate_holo20" />    <item android:duration="400" android:drawable="@drawable/progressbar_indeterminate_holo21" /></animation-list>

activity_main.xml

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"    xmlns:tools="http://schemas.android.com/tools"    android:layout_width="match_parent"    android:layout_height="match_parent"    android:orientation="vertical"    tools:context=".MainActivity" >    <RelativeLayout        android:layout_width="match_parent"        android:layout_height="wrap_content"        android:layout_marginTop="20dp" >        <ProgressBar            android:layout_width="match_parent"            android:layout_height="2dp"            android:indeterminateDrawable="@drawable/horizontal_loading_animation" />    </RelativeLayout>    <LinearLayout        android:layout_width="match_parent"        android:layout_height="wrap_content"        android:layout_marginTop="20dp"        android:orientation="vertical" >        <ImageView            android:id="@+id/iv"            android:layout_width="wrap_content"            android:layout_height="wrap_content"             android:contentDescription="@string/app_name"            />                <Button             android:id="@+id/bt_start"            android:layout_marginTop="10dp"            android:layout_width="wrap_content"            android:layout_height="wrap_content"            android:text="开始"            />            </LinearLayout></LinearLayout>

MainActivity.java

package com.example.loadingview;import android.app.Activity;import android.graphics.drawable.AnimationDrawable;import android.os.Bundle;import android.view.View;import android.view.View.OnClickListener;import android.widget.Button;import android.widget.ImageView;public class MainActivity extends Activity {@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_main);findView();}private void findView() {ImageView rocketImage = (ImageView) findViewById(R.id.iv);rocketImage.setBackgroundResource(R.drawable.common_loading_animation);final AnimationDrawable rocketAnimation = (AnimationDrawable) rocketImage.getBackground();Button bt_start = (Button) findViewById(R.id.bt_start);bt_start.setOnClickListener(new OnClickListener() {@Overridepublic void onClick(View v) {rocketAnimation.start();//rocketAnimation.stop();//停止}});}}

详细可参考：http://developer.android.com/guide/topics/graphics/drawable-animation.html