Android实现仿慕课网下拉加载动画

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。