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Android仿京东、天猫下拉刷新效果

作者:shineflowers

这篇文章主要为大家详细介绍了Android仿京东、天猫下拉刷新效果,具有一定的参考价值,感兴趣的小伙伴们可以参考一下

说到下拉刷新,相信大家都不陌生,现在基本上每个项目都会用到。我们公司的项目一直都是使用SwipeRefreshLayout,官方的Material Design风格,好用少Bug。现在下拉刷新大概有下面几种实现方式:一种是直接包在ListView或者RecyclerView的头部,有的则是像SwipeRefreshLayout一样,包在视图的最外层,个人建议使用包在最外层的做法,可拓展性比较强。下面用包在最外层的方法实现京东和天猫的下拉刷新。

1.使用框架Android-Ultra-Pull-To-Refresh

https://github.com/liaohuqiu/android-Ultra-Pull-To-Refresh

大家有兴趣的可以去看一下这个下拉刷新框架,可拓展性非常强,兼容各种View的下拉刷新事件。

2.京东下拉刷新

先看看京东的下拉刷新动画:

从上图可以看出,就是一个动画,当然截图有点卡,首先,我们解压手机京东的app,得到上面的图片:

先看看头部刷新的布局怎么实现:
jd_refresh_header_view.xml

<?xml version="1.0" encoding="utf-8"?> 
<RelativeLayout 
 xmlns:android="http://schemas.android.com/apk/res/android" 
 android:layout_width="match_parent" 
 android:layout_height="wrap_content"> 
 
 <FrameLayout 
  android:layout_width="wrap_content" 
  android:layout_height="wrap_content" 
  android:layout_toLeftOf="@+id/layout_tx"> 
 
  <ImageView 
   android:id="@+id/iv_man" 
   android:layout_width="wrap_content" 
   android:layout_height="wrap_content" 
   android:background="@drawable/a2a" /> 
 
  <ImageView 
   android:id="@+id/iv_goods" 
   android:layout_width="wrap_content" 
   android:layout_height="wrap_content" 
   android:layout_gravity="right|center" 
   android:src="@drawable/a29" /> 
 </FrameLayout> 
 
 <LinearLayout 
  android:id="@+id/layout_tx" 
  android:layout_width="wrap_content" 
  android:layout_height="wrap_content" 
  android:layout_centerInParent="true" 
  android:layout_marginLeft="5dp" 
  android:gravity="center_vertical" 
  android:orientation="vertical" 
  android:padding="5dp"> 
 
  <TextView 
   android:layout_width="wrap_content" 
   android:layout_height="wrap_content" 
   android:text="让购物更便捷" 
   android:textSize="14sp" /> 
 
  <TextView 
   android:id="@+id/tv_remain" 
   android:layout_width="wrap_content" 
   android:layout_height="wrap_content" 
   android:layout_marginTop="5dp" 
   android:text="松开刷新" 
   android:textSize="12sp" /> 
 </LinearLayout> 
</RelativeLayout> 


咱们再看看android-Ultra-Pull-To-Refresh这个框架:

package in.srain.cube.views.ptr; 
 
import in.srain.cube.views.ptr.indicator.PtrIndicator; 
 
/** 
 * 
 */ 
public interface PtrUIHandler { 
 
 /** 
  * When the content view has reached top and refresh has been completed, view will be reset. 
  * 
  * @param frame 
  */ 
 public void onUIReset(PtrFrameLayout frame); 
 
 /** 
  * prepare for loading 
  * 
  * @param frame 
  */ 
 public void onUIRefreshPrepare(PtrFrameLayout frame); 
 
 /** 
  * perform refreshing UI 
  */ 
 public void onUIRefreshBegin(PtrFrameLayout frame); 
 
 /** 
  * perform UI after refresh 
  */ 
 public void onUIRefreshComplete(PtrFrameLayout frame); 
 
 public void onUIPositionChange(PtrFrameLayout frame, boolean isUnderTouch, byte status, PtrIndicator ptrIndicator); 
} 

这是一个下拉刷新事件处理接口,包括准备刷新,开始刷新,刷新完成和刷新改变等事件的处理,直接上代码:
JdRefreshHeader.java

package com.jackie.pulltorefresh.jd; 
 
import android.content.Context; 
import android.graphics.drawable.AnimationDrawable; 
import android.util.AttributeSet; 
import android.view.LayoutInflater; 
import android.view.View; 
import android.widget.FrameLayout; 
import android.widget.ImageView; 
import android.widget.TextView; 
 
import com.jackie.pulltorefresh.R; 
 
import in.srain.cube.views.ptr.PtrFrameLayout; 
import in.srain.cube.views.ptr.PtrUIHandler; 
import in.srain.cube.views.ptr.indicator.PtrIndicator; 
 
/** 
 * 下拉刷新HeaderView 
 */ 
public class JdRefreshHeader extends FrameLayout implements PtrUIHandler { 
 /** 
  * 提醒文本 
  */ 
 private TextView mTvRemind; 
 
 /** 
  * 快递员logo 
  */ 
 private ImageView mIvMan; 
 
 /** 
  * 商品logo 
  */ 
 private ImageView mIvGoods; 
 
 /** 
  * 状态识别 
  */ 
 private int mState; 
 
 /** 
  * 重置 
  * 准备刷新 
  * 开始刷新 
  * 结束刷新 
  */ 
 public static final int STATE_RESET = -1; 
 public static final int STATE_PREPARE = 0; 
 public static final int STATE_BEGIN = 1; 
 public static final int STATE_FINISH = 2; 
 
 public static final int MARGIN_RIGHT = 100; 
 
 /** 
  * 动画 
  */ 
 private AnimationDrawable mAnimationDrawable; 
 
 
 public JdRefreshHeader(Context context) { 
  this(context, null); 
 } 
 
 public JdRefreshHeader(Context context, AttributeSet attrs) { 
  this(context, attrs, 0); 
 } 
 
 public JdRefreshHeader(Context context, AttributeSet attrs, int defStyleAttr) { 
  super(context, attrs, defStyleAttr); 
 
  initView(); 
 } 
 
 /** 
  * 初始化view 
  */ 
 private void initView() { 
  View view = LayoutInflater.from(getContext()).inflate(R.layout.jd_refresh_header_view, this, false); 
  mTvRemind = (TextView) view.findViewById(R.id.tv_remain); 
  mIvMan = (ImageView) view.findViewById(R.id.iv_man); 
  mIvGoods = (ImageView) view.findViewById(R.id.iv_goods); 
  addView(view); 
 } 
 
 
 @Override 
 public void onUIReset(PtrFrameLayout frame) { 
  mState = STATE_RESET; 
 } 
 
 @Override 
 public void onUIRefreshPrepare(PtrFrameLayout frame) { 
  mState = STATE_PREPARE; 
 } 
 
 @Override 
 public void onUIRefreshBegin(PtrFrameLayout frame) { 
  mState = STATE_BEGIN; 
  //隐藏商品logo,开启跑步动画 
  mIvGoods.setVisibility(View.GONE); 
  mIvMan.setBackgroundResource(R.drawable.runningman); 
  mAnimationDrawable = (AnimationDrawable) mIvMan.getBackground(); 
  if (!mAnimationDrawable.isRunning()) { 
   mAnimationDrawable.start(); 
  } 
 } 
 
 @Override 
 public void onUIRefreshComplete(PtrFrameLayout frame) { 
  mState = STATE_FINISH; 
  mIvGoods.setVisibility(View.VISIBLE); 
  //停止动画 
  if (mAnimationDrawable.isRunning()) { 
   mAnimationDrawable.stop(); 
  } 
  mIvMan.setBackgroundResource(R.drawable.a2a); 
 } 
 
 @Override 
 public void onUIPositionChange(PtrFrameLayout frame, boolean isUnderTouch, byte status, PtrIndicator ptrIndicator) { 
  //处理提醒字体 
  switch (mState) { 
   case STATE_PREPARE: 
    //logo设置 
    mIvMan.setAlpha(ptrIndicator.getCurrentPercent()); 
    mIvGoods.setAlpha(ptrIndicator.getCurrentPercent()); 
    LayoutParams params = (LayoutParams) mIvMan.getLayoutParams(); 
    if (ptrIndicator.getCurrentPercent() <= 1) { 
     mIvMan.setScaleX(ptrIndicator.getCurrentPercent()); 
     mIvMan.setScaleY(ptrIndicator.getCurrentPercent()); 
     mIvGoods.setScaleX(ptrIndicator.getCurrentPercent()); 
     mIvGoods.setScaleY(ptrIndicator.getCurrentPercent()); 
     int marginRight = (int) (MARGIN_RIGHT - MARGIN_RIGHT * ptrIndicator.getCurrentPercent()); 
     params.setMargins(0, 0, marginRight, 0); 
     mIvMan.setLayoutParams(params); 
    } 
 
    if (ptrIndicator.getCurrentPercent() < 1.2) { 
     mTvRemind.setText("下拉刷新..."); 
    } else { 
     mTvRemind.setText("松开刷新..."); 
    } 
    break; 
   case STATE_BEGIN: 
    mTvRemind.setText("更新中..."); 
    break; 
   case STATE_FINISH: 
    mTvRemind.setText("加载完成..."); 
    break; 
  } 
 } 
} 

创建一个成员变量mState,用于保存下拉刷新的时候,每一个状态,然后根据保存好的状态在UIPositionChange的接口中,对UI进行相应的修改,保存每个状态文本的提示,在下拉的过程中,通过UIPositionChange的回调,获取PtrIndicator中,可以获取下拉的百分比,根据这个百分比我们可以做很多东西,例如京东的快递小哥从远处跑过来拿商品,以及快递小哥与商品之间的大小,都可以根据这个PtrIndicator百分比进行设置其大小的比例,跑过来这个过程我使用的方法是利用marginRight进行设置两者之间的距离,当达到下拉刷新的临界点时,快递小哥跟商品之间的margin为0,达到了快递小哥获取商品的效果,然后当刷新的时候,隐藏商品,使用之前所提供的三张图片进行效应的切换,也就是动画:

<?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/a2b" 
  android:duration="70" /> 
 <item 
  android:drawable="@drawable/a2c" 
  android:duration="70" /> 
 <item 
  android:drawable="@drawable/a2d" 
  android:duration="70" /> 
</animation-list> 

效果图如下:

3.天猫下拉刷新

天猫的更简单,毫无动画可言,说白了就是个GIF,大家可以去下载个apk,解压后能得到其gif。原理跟之前的是一样,但这里我使用的是fresco进行加载gif,方法有很多,大家感兴趣的可以去试试。

TmallRefreshHeader.java

package com.jackie.pulltorefresh.tmall; 
 
import android.content.Context; 
import android.net.Uri; 
import android.util.AttributeSet; 
import android.view.LayoutInflater; 
import android.view.View; 
import android.widget.FrameLayout; 
import android.widget.TextView; 
 
import com.facebook.drawee.backends.pipeline.Fresco; 
import com.facebook.drawee.interfaces.DraweeController; 
import com.facebook.drawee.view.SimpleDraweeView; 
import com.jackie.pulltorefresh.R; 
 
import in.srain.cube.views.ptr.PtrFrameLayout; 
import in.srain.cube.views.ptr.PtrUIHandler; 
import in.srain.cube.views.ptr.indicator.PtrIndicator; 
 
/** 
 * 下拉刷新HeaderView 
 */ 
public class TmallRefreshHeader extends FrameLayout implements PtrUIHandler { 
 
 /** 
  * 提醒文本 
  */ 
 private TextView mTvRemind; 
 
 
 /** 
  * 状态识别 
  */ 
 private int mState; 
 
 /** 
  * 重置 
  * 准备刷新 
  * 开始刷新 
  * 结束刷新 
  */ 
 public static final int STATE_RESET = -1; 
 public static final int STATE_PREPARE = 0; 
 public static final int STATE_BEGIN = 1; 
 public static final int STATE_FINISH = 2; 
 
 
 public TmallRefreshHeader(Context context) { 
  this(context, null); 
 } 
 
 public TmallRefreshHeader(Context context, AttributeSet attrs) { 
  this(context, attrs, 0); 
 } 
 
 public TmallRefreshHeader(Context context, AttributeSet attrs, int defStyleAttr) { 
  super(context, attrs, defStyleAttr); 
 
  initView(); 
 } 
 
 /** 
  * 初始化view 
  */ 
 private void initView() { 
  View view = LayoutInflater.from(getContext()).inflate(R.layout.tmall_refresh_header_view, this, false); 
  mTvRemind = (TextView) view.findViewById(R.id.tv_remind); 
  SimpleDraweeView sdv = (SimpleDraweeView) view.findViewById(R.id.tm_logo); 
  DraweeController draweeController = Fresco.newDraweeControllerBuilder() 
    .setAutoPlayAnimations(true) 
    //设置uri,加载本地的gif资源 
    .setUri(Uri.parse("res://" + getContext().getPackageName() + "/" + R.drawable.tm_mui_bike))//设置uri 
    .build(); 
  sdv.setController(draweeController); 
  addView(view); 
 } 
 
 
 @Override 
 public void onUIReset(PtrFrameLayout frame) { 
  mState = STATE_RESET; 
 } 
 
 @Override 
 public void onUIRefreshPrepare(PtrFrameLayout frame) { 
  mState = STATE_PREPARE; 
 } 
 
 @Override 
 public void onUIRefreshBegin(PtrFrameLayout frame) { 
  mState = STATE_BEGIN; 
 } 
 
 @Override 
 public void onUIRefreshComplete(PtrFrameLayout frame) { 
  mState = STATE_FINISH; 
 } 
 
 @Override 
 public void onUIPositionChange(PtrFrameLayout frame, boolean isUnderTouch, byte status, PtrIndicator ptrIndicator) { 
  //处理提醒字体 
  switch (mState) { 
   case STATE_PREPARE: 
    if (ptrIndicator.getCurrentPercent() < 1) { 
     mTvRemind.setText("下拉刷新"); 
    } else { 
     mTvRemind.setText("松开立即刷新"); 
    } 
    break; 
   case STATE_BEGIN: 
    mTvRemind.setText("正在刷新..."); 
    break; 
   case STATE_FINISH: 
    mTvRemind.setText("加载完成..."); 
    break; 
  } 
 } 
} 

效果图如下:

最后附上github地址:
https://github.com/shineflower/JdTmallPullToRefresh

以上就是本文的全部内容,希望对大家的学习有所帮助,也希望大家多多支持脚本之家。

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