Android实现下拉加载动画的效果

具体实现方法就不多介绍了先附上源码，相信大家都容易看的懂：

这里为了让这个动画效果可被复用，于是就继承了imageview 去实现某些方法

 

package com.example.loading_drawable;

import android.content.context;
import android.graphics.drawable.animationdrawable;
import android.util.attributeset;
import android.util.log;
import android.view.view;
import android.view.animation.animation;
import android.widget.imageview;

public class myimgview extends imageview {
// 动画图层类
private animationdrawable bg_anim;

public myimgview(context context) {
super(context, null);
initview();
}

public myimgview(context context, attributeset attrs) {
super(context, attrs, 0);
}

public myimgview(context context, attributeset attrs, int defstyle) {
super(context, attrs, defstyle);

}
　　//初始化
private void initview() {
setbackgroundresource(r.drawable.flash_anim);
bg_anim = (animationdrawable) getbackground();
log.i("aaa", "iniview");
}

/**
* 开启动画效果
*/
public void startanim() {
if (bg_anim != null) {
 bg_anim.start();
}
}

/**
* 停止动画效果
*/
public void stopanim() {
if (bg_anim != null && bg_anim.isrunning()) {
 bg_anim.stop();
}
}

/*
* (non-javadoc)
* 
* @see android.widget.imageview#setvisibility(int) 当控件被显示时就调用 开启动画效果，反之
*/
@override
public void setvisibility(int visibility) {
super.setvisibility(visibility);
if (visibility == view.visible) {
 startanim();
} else {
 stopanim();
}
}

}

 接下来就是：在res文件夹下新建 drawable文件夹，再此文件夹下新建 flash_anim.xml文件，具体如下：

 

<?xml version="1.0" encoding="utf-8"?>
<animation-list xmlns:android="http://schemas.android.com/apk/res/android"
android:oneshot="false">
<item android:drawable="@drawable/a01_02" android:duration="50"/>
<item android:drawable="@drawable/a01_04" android:duration="50"/>
<item android:drawable="@drawable/a01_06" android:duration="50"/>
<item android:drawable="@drawable/a01_08" android:duration="50"/>
<item android:drawable="@drawable/a01_10" android:duration="50"/>
<item android:drawable="@drawable/a01_12" android:duration="50"/>
<item android:drawable="@drawable/a01_14" android:duration="50"/>
<item android:drawable="@drawable/a01_16" android:duration="50"/>
<item android:drawable="@drawable/a01_25" android:duration="50"/>
<item android:drawable="@drawable/a01_26" android:duration="50"/>
<item android:drawable="@drawable/a01_27" android:duration="50"/>
<item android:drawable="@drawable/a01_28" android:duration="50"/>
<item android:drawable="@drawable/a01_30" android:duration="50"/>
<item android:drawable="@drawable/a01_31" android:duration="50"/>
<item android:drawable="@drawable/a01_32" android:duration="50"/>
<item android:drawable="@drawable/a01_41" android:duration="50"/>
<item android:drawable="@drawable/a01_42" android:duration="50"/>
<item android:drawable="@drawable/a01_43" android:duration="50"/>
<item android:drawable="@drawable/a01_44" android:duration="50"/>
<item android:drawable="@drawable/a01_45" android:duration="50"/>
<item android:drawable="@drawable/a01_46" android:duration="50"/>
<item android:drawable="@drawable/a01_47" android:duration="50"/>
<item android:drawable="@drawable/a01_48" android:duration="50"/>
<item android:drawable="@drawable/a01_57" android:duration="50"/>
<item android:drawable="@drawable/a01_58" android:duration="50"/>
<item android:drawable="@drawable/a01_59" android:duration="50"/>
<item android:drawable="@drawable/a01_60" android:duration="50"/>
<item android:drawable="@drawable/a01_61" android:duration="50"/>
<item android:drawable="@drawable/a01_62" android:duration="50"/>
<item android:drawable="@drawable/a01_63" android:duration="50"/>
<item android:drawable="@drawable/a01_64" android:duration="50"/>
</animation-list>

这样就基本搞定了，接下来就要在main中调用自定义的main就可以;如下：

package com.example.loading_drawable;

import android.app.activity;
import android.os.bundle;
import android.view.gravity;
import android.view.view;
import android.view.view.onclicklistener;
import android.widget.button;
import android.widget.linearlayout;
import android.widget.linearlayout.layoutparams;

/**
* @author administrator 慕课网下拉刷新进度显示控件
* 
*/
public class mainactivity extends activity {
@override
protected void oncreate(bundle savedinstancestate) {
 super.oncreate(savedinstancestate);
 linearlayout rootlayout = new linearlayout(this);
 rootlayout.setorientation(linearlayout.vertical);
 rootlayout.setlayoutparams(new linearlayout.layoutparams(
   linearlayout.layoutparams.match_parent,
   linearlayout.layoutparams.match_parent));
 rootlayout.setgravity(gravity.center);

 button btn = new button(this);
 btn.settext("展现动画");

 final myimgview imgview = new myimgview(mainactivity.this);
 imgview.setlayoutparams(new linearlayout.layoutparams(
   linearlayout.layoutparams.wrap_content,
   linearlayout.layoutparams.wrap_content));
 imgview.setvisibility(view.gone);

 rootlayout.addview(btn);
 rootlayout.addview(imgview);

 setcontentview(rootlayout);

 btn.setonclicklistener(new onclicklistener() {

  @override
  public void onclick(view arg0) {
   imgview.setvisibility(view.visible);
  }
 });
}
}

这里是用自定义代码布局文件做的，布局方便，插件代码整合，如上所述，这个动画就完成了，只在需要的地方设置imgview为显示，动画就会开启，隐藏动画就会被关闭。

具体内容到此为止，希望大家能够喜欢。