Android实现仿慕课网下拉加载动画

2020-04-11 11:28:11

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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*/@Overridepublic 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 {@Overrideprotected 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。

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