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Android实践之带加载效果的下拉刷新上拉加载更多

Android   发布时间：2022-04-28  发布网站：大佬教程  code.js-code.com
大佬教程收集整理的这篇文章主要介绍了Android实践之带加载效果的下拉刷新上拉加载更多，大佬教程大佬觉得挺不错的，现在分享给大家，也给大家做个参考。

前言

之前写的一个LoadingBar，这次把LoadingBar加到下拉刷新的头部。从头写一个下拉刷新，附赠上拉加载更多。下面话不多说了，来一起看看详细的介绍吧。

效果图：

@H_502_15@@H_618_15@Android实践之带加载效果的下拉刷新上拉加载更多

实现过程

首先是自定义属性，attrs.xml中定义头部的高度和上下的padding。

####attrs.xml####

<?xml version="1.0" encoding="utf-8"?>
<resources>
 <declare-styleable name="PPrefreshView_header">
 <attr name="header_height" format="dimension"/>
 <attr name="header_padding" format="dimension"/>
 </declare-styleable>
</resources>

然后是头部的文件，里面放了一个TextView和一个图片

header_layout.xml####

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://scheR_950_11845@as.android.com/apk/res/android"
 android:layout_width="match_parent"
 android:layout_height="50dp"
 android:orientation="vertical">
 <ImageView
 android:src="@mipmap/down"
 android:layout_centerVertical="true"
 android:id="@+id/icon"
 android:layout_width="20dp"
 android:layout_height="20dp"
 android:layout_toLeftOf="@+id/text"
 android:layout_marginRight="5dp"/>
 <TextView
 android:id="@+id/text"
 android:layout_width="wrap_content"
 android:layout_height="wrap_content"
 android:layout_centerInParent="true"
 android:text="下拉刷新" />
</RelativeLayout>

然后是布局文件,让PPrefreshView作为父布局，下面可以放AbsListView的子类。

activity_main.xml####

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://scheR_950_11845@as.android.com/apk/res/android" xmlns:pprefreshView="http://scheR_950_11845@as.android.com/apk/res-auto"
 xmlns:tools="http://scheR_950_11845@as.android.com/tools"
 android:layout_width="match_parent"
 android:layout_height="match_parent"
 android:BACkground="@color/white" tools:context="top.greendami.greendami.MainActivity">
 <top.greendami.greendami.PPrefreshView
 pprefreshView:header_height="50dp"
 pprefreshView:header_padding="10dp"
 android:id="@+id/swiperefreshLayout"
 android:layout_width="match_parent"
 android:layout_height="match_parent"
 android:BACkground="#d4d4d4">
 <ListView
 android:BACkground="@color/white"
 android:id="@+id/list" android:layout_width="match_parent" android:layout_height="match_parent"></ListView>
 </top.greendami.greendami.PPrefreshView>
</RelativeLayout>

最后是重点，下拉刷新的控件。

"精心"准备了一张图

@H_502_15@@H_618_15@Android实践之带加载效果的下拉刷新上拉加载更多

####PPrefreshView.java####

package top.greendami.greendami;
package com.allrun.arsmartelevatorfoRMANager.widget;
import android.content.Context;
import android.content.res.TypedArray;
import android.graphics.Canvas;
import android.support.v7.widget.RecyclerView;
import android.util.AttributeSet;
import android.view.LayoutInflater;
import android.view.MotionEvent;
import android.view.View;
import android.view.ViewConfiguration;
import android.view.ViewGroup;
import android.view.animation.Animation;
import android.view.animation.RotateAnimation;
import android.widget.ImageView;
import android.widget.TextView;
import com.allrun.arsmartelevatorfoRMANager.R;
import com.allrun.arsmartelevatorfoRMANager.util.DPUnitUtil;
/**
 * Created by GreendaMI on 2017/3/21.
 */
public class PPrefreshView extends ViewGroup {
 Context context;
 RecyclerView mListView;
 PPView mPPView;
 View header;
 TextView title;
 ImageView mImage;//箭头
 int listTop = 0;
 float headerHeight = 10 + 30 + 10;//header的高度，上留白 + 文字（PPVIew）高度 + 下留白
 float headerpadding = 10;//上留白,下留白
 privatE int mYDown,mLastY;
 //最短滑动距离
 int a = 0;
 RotateAnimation mRotateAnimation;
 int state = 0; //0,正常;1,下拉;2,松开
 public void setPPrefreshViewListener(PPrefreshViewListener mPPrefreshViewListener) {
 this.mPPrefreshViewListener = mPPrefreshViewListener;
 }
 PPrefreshViewListener mPPrefreshViewListener;
 public PPrefreshView(Context context) {
 super(context);
 this.context = context;
 }
 public PPrefreshView(Context context,AttributeSet attrs) {
 super(context,attrs);
 this.context = context;
 //px转dp
 a = DPUnitUtil.px2dip(context,ViewConfiguration.get(context).getScaledDoubleTapSlop());
 TypedArray b = context.obtainStyledAttributes(attrs,R.styleable.PPrefreshView_header);
 headerHeight = b.getDimension(R.styleable.PPrefreshView_header_header_height,100);
 headerpadding = b.getDimension(R.styleable.PPrefreshView_header_header_padding,10);
 b.recycle();
 initAnima();
 }
 private void initAnima() {
 //箭头旋转
 mRotateAnimation = new RotateAnimation(0,180,Animation.RELATIVE_TO_SELF,0.5f,0.5f);
 mRotateAnimation.setFillAfter(true);
 mRotateAnimation.setDuration(200);
 }
 @Override
 protected void onMeasure(int widthMeasureSpec,int heightMeasureSpeC) {
 if (mPPView != null) {
 mPPView.measure(widthMeasureSpec,(@R_674_10185@ (headerHeight- 2 * headerpadding));
 }
 if (header != null) {
 header.measure(widthMeasureSpec,(@R_674_10185@ (headerHeight- 2 * headerpadding));
 }
 super.onMeasure(widthMeasureSpec,heightMeasureSpec);
 }
 @Override
 protected void onLayout(Boolean changed,int l,int t,int r,int b) {
 if (mListView == null && getChildCount() == 1) {
 mListView = (RecyclerView)getChildAt(0);
 mListView.setOnScrollListener(new RecyclerView.onScrollListener() {
 @Override
 public void onScrolled(RecyclerView recyclerView,int dx,int dy) {
  super.onScrolled(recyclerView,dx,dy);
  if(!recyclerView.canScrollVertically(1)){
  //添加外部回调
  if(mPPrefreshViewListener != null){  mPPrefreshViewListener.LoadMore();
  }
  }
 }
 });
 }
 if (mListView != null) {
 mListView.layout(l,listTop,getMeasuredWidth(),b);
 }
 if (mPPView != null) {
 //top：文字（PPVIew）高度 + 下留白
 mPPView.layout(l,(@R_674_10185@(listTop - headerHeight + headerpadding),r,listTop);
 }
 if (header != null) {
 //top：文字（PPView）高度 + 下留白
 header.layout(l,listTop);
 }
 }
 @Override
 protected void dispatchDraw(Canvas canvas) {
 super.dispatchDraw(canvas);
 //松开手指，list回到顶部
 if (state == 2) {
 listTop = listTop - 25;
 if (listTop < headerHeight) {
 listTop = (@R_674_10185@headerHeight;
 }
 requestLayout();
 }
 //刷新完毕，关闭header
 if (state == 0 && listTop > 0) {
 listTop = listTop - 25;
 if (listTop < 0) {
 listTop = 0;
 }
 requestLayout();
 }
 }
 @Override
 public Boolean dispatchTouchEvent(MotionEvent event) {
 final int action = event.getAction();
 switch (action) {
 case MotionEvent.ACTION_DOWN:
 // 按下
 mYDown = (@R_674_10185@ event.getRawY();
 break;
 case MotionEvent.ACTION_MOVE:
 // 移动
 mLastY = (@R_674_10185@ event.getRawY();
 if (!mListView.canScrollVertically(-1) && mLastY > mYDown &&(mLastY - mYDown) > a) {
  state = 1;
  listTop = mLastY - mYDown;
  if (mPPView != null) {
  removeView(mPPView);
  mPPView = null;
  }
  if (header == null) {
  header = LayoutInflater.from(context).inflate(R.layout.header_layout,null,falsE);
  title = ((TextView) header.findViewById(R.id.text));
  mImage = ((ImageView) header.findViewById(R.id.icon));
  addView(header);
  }
  if (title != null && (mLastY - mYDown) > a * 2f) {
  title.setText("松开刷新");
  if (mImage.getAnimation() == null) {
  mImage.startAnimation(mRotateAnimation);
  }
  }
  if (title != null && (mLastY - mYDown) < a * 2f) {
  title.setText("下拉刷新");
  mImage.setImageresource(R.mipmap.down);
  }
  requestLayout();
  //已经判断是下拉刷新，拦截手势
  return false;
 }
 break;
 case MotionEvent.ACTION_UP:
 // 抬起
// if (canLoad()) {
//  loadData();
// }
 //松手的时候，把文字标题去掉
 if (header != null) {
  removeView(header);
  header = null;
 }
 //如果之前是下拉状态，就添加PPVIew
 if (mPPView == null && state == 1) {
  //添加外部回调
  if(mPPrefreshViewListener != null){
  mPPrefreshViewlistener.onrefresh();
  }
  mPPView = new PPView(context);
  addView(mPPView);
  mYDown = 0;
  mLastY = 0;
  state = 2;
  requestLayout();
 }
 break;
 default:
 break;
 }
 return super.dispatchTouchEvent(event);
 }
 /**
 * 收起下拉刷新的header，刷新结束
 */
 public void refreshOver() {
 if (mPPView != null) {
 removeView(mPPView);
 mPPView = null;
 }
 if (header != null) {
 removeView(header);
 header = null;
 title = null;
 mImage = null;
 }
 state = 0;
 }
 public void setrefreshing(Boolean b) {
 if(!b){
 state = 0;
 posTinvalidate();
 }else{
 state = 2;
 posTinvalidate();
 }
 }
 public interface PPrefreshViewListener{
 void onrefresh();
 void LoadMore();
 }
}

主要思路是监听手势的滑动距离，如果ListView已经划到顶部，则ListView跟随手指位置，并添加Header。放开手指后,ListView慢慢回到顶部。

外部回调。监听下拉和上拉。

 mSwiperefreshLayout.setPPrefreshViewListener(new PPrefreshView.PPrefreshViewListener() {
 @Override
 public void onrefresh() {
 Toast.makeText(MainActivity.this,"亲,刷新了",Toast.LENGTH_SHORT).show();
 data.add("测试数据100");
 mAdapter.notifyDataSetChanged();
 }
 @Override
 public void LoadMore() {
 Toast.makeText(MainActivity.this,"加载更多",Toast.LENGTH_SHORT).show();
 }
 });
refreshLayout.setrefreshing(false);;//刷新完毕

差点忘了粘连小球的View。

####PPView.java####
package top.greendami.greendami;
import android.content.Context;
import android.graphics.Canvas;
import android.graphics.Paint;
import android.graphics.Path;
import android.support.Annotation.Nullable;
import android.util.AttributeSet;
import android.view.View;
/**
 * Created by GreendaMi on 2017/3/17.
 */
public class PPView extends View {
 String TAG = "PPView";
 //动画开关
 Boolean isLoading = true;
 Context mContext;
 privatE int mWidth = 100;
 privatE int mheight = 100;
 public int mColor;
 public Paint mPaint = new Paint();
 float time = 0;
 //小球与中间打球的最远距离
 float distance = 100;
 public PPView(Context context) {
 super(context);
 mContext = context;
 mColor = context.getresources().getColor(R.color.colorPriMary);
 init();
 }
 public PPView(Context context,@Nullable AttributeSet attrs) {
 super(context,attrs);
 mContext = context;
 mColor = context.getresources().getColor(R.color.colorPriMary);
 init();
 }
 private void init() {
 mPaint.setAntiAlias(true);
 mPaint.setColor(mColor);
 }
 @Override
 protected void onMeasure(int widthMeasureSpec,int heightMeasureSpeC) {
 super.onMeasure(widthMeasureSpec,heightMeasureSpec);
 int widthSpecSize = MeasureSpec.getSize(widthMeasureSpec);
 int heightSpecSize = MeasureSpec.getSize(heightMeasureSpec);
 //宽度至少是高度的4倍
 if (widthSpecSize < 4 * heightSpecSizE) {
 widthSpecSize = 4 * heightSpecSize;
 }
 mWidth = widthSpecSize;
 mheight = heightSpecSize;
 distance = 1.2f * mheight;
 setMeasuredDimension(widthSpecSize,heightSpecSizE);
 }
 @Override
 protected void onDraw(Canvas canvas) {
 super.onDraw(canvas);
 if (isLoading) {
 //大圆半径
 float bigR = mheight * 0.32f + mheight * 0.03f * Math.abs((float) Math.sin(Math.toradians(timE)));
 float smallR = mheight * 0.17f + mheight * 0.03f * Math.abs((float) Math.cos(Math.toradians(timE)));
 float bigx = (getWidth()) / 2;
 //画中间大圆
 canvas.drawCircle(bigx,mheight / 2,bigR,mPa@R_674_10185@;
 float smalx = getsmallCenterX();
 //画小圆
 canvas.drawCircle(smalx,smallR,mPa@R_674_10185@;
 //画链接
 //小球在右侧
 if (smalx > bigX) {
 Path path = new Path();
 //上面的贝塞尔曲线的第一个点，在大圆身上
 float x1 = bigx + bigR * (float) Math.cos(Math.toradians(timE));
 float y1 = mheight / 2 - bigR * (float) Math.sin(Math.toradians(timE));
 if (y1 > mheight / 2 - smallR) {
  y1 = mheight / 2 - smallR;
  x1 = bigx + (float) (Math.sqrt(bigR * bigR - smallR * smallR));
 }
 //上面的贝塞尔曲线的第三个点，在小圆身上
 float x2 = smalx - smallR * (float) Math.cos(Math.toradians(timE));
 float y2 = mheight / 2 - smallR * (float) Math.sin(Math.toradians(timE));
 if (y2 > mheight / 2 - smallR * 0.8) {
  y2 = mheight / 2 - smallR * 0.8f;
  x2 = smalx - smallR * (float) (Math.sqrt(1-0.64f));
 }
 //下面的贝塞尔曲线的第三个点，在小圆身上
 float x3 = smalx - smallR * (float) Math.cos(Math.toradians(timE));
 float y3 = mheight / 2 + smallR * (float) Math.sin(Math.toradians(timE));
 if (y3 < mheight / 2 + smallR * 0.8) {
  y3 = mheight / 2 + smallR * 0.8f;
  x3 = smalx - smallR * (float) (Math.sqrt(1-0.64f));
 }
 //下面的贝塞尔曲线的第一个点，在大圆身上
 float x4 = bigx + bigR * (float) Math.cos(Math.toradians(timE));
 float y4 = mheight / 2 + bigR * (float) Math.sin(Math.toradians(timE));
 if (y4 < mheight / 2 + smallR) {
  y4 = mheight / 2 + smallR;
  x4 = bigx + (float) (Math.sqrt(bigR * bigR - smallR * smallR));
 }
 path.moveTo(x1,y1);
 path.quadTo((bigx + smalX) / 2,x2,y2);
 // 绘制贝赛尔曲线（Path）
 path.lineTo(x3,y3);
 path.quadTo((bigx + smalX) / 2,x4,y4);
 canvas.drawPath(path,mPa@R_674_10185@;
 }
 //小球在左侧
 if (smalx < bigX) {
 Path path = new Path();
 float x1 = bigx + bigR * (float) Math.cos(Math.toradians(timE));
 float y1 = mheight / 2 - bigR * (float) Math.sin(Math.toradians(timE));
 if (y1 > mheight / 2 - smallR) {
  y1 = mheight / 2 - smallR;
  x1 = bigx - (float) (Math.sqrt(bigR * bigR - smallR * smallR));
 }
 float x2 = smalx - smallR * (float) Math.cos(Math.toradians(timE));
 float y2 = mheight / 2 - smallR * (float) Math.sin(Math.toradians(timE));
 if (y2 > mheight / 2 - smallR * 0.8) {
  y2 = mheight / 2 - smallR * 0.8f;
  x2 = smalx + smallR * (float) (Math.sqrt(1-0.64f));
 }
 float x3 = smalx - smallR * (float) Math.cos(Math.toradians(timE));
 float y3 = mheight / 2 + smallR * (float) Math.sin(Math.toradians(timE));
 if (y3 < mheight / 2 + smallR * 0.8) {
  y3 = mheight / 2 + smallR * 0.8f;
  x3 = smalx + smallR * (float) (Math.sqrt(1-0.64f));
 }
 float x4 = bigx + bigR * (float) Math.cos(Math.toradians(timE));
 float y4 = mheight / 2 + bigR * (float) Math.sin(Math.toradians(timE));
 if (y4 < mheight / 2 + smallR) {
  y4 = mheight / 2 + smallR;
  x4 = bigx - (float) (Math.sqrt(bigR * bigR - smallR * smallR));
 }
 path.moveTo(x1,y2);
 // 绘制贝赛尔曲线（Path）

 path.lineTo(x3,y3);

 path.quadTo((bigx + smalX) / 2,mPa@R_674_10185@;
 }

 posTinvalidate();
 }
 }
 //计算小球的X坐标
 private float getsmallCenterX() {
 //此处控制速度
 time = time + 4f;
 return mWidth / 2 + distance * (float) Math.cos(Math.toradians(timE));
 }
}

两张素材

@H_502_15@@H_618_15@Android实践之带加载效果的下拉刷新上拉加载更多


@H_502_15@@H_618_15@Android实践之带加载效果的下拉刷新上拉加载更多

总结

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大佬总结

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