【FastDev4Android框架開發(fā)】Android 列表下拉刷新組件PullToRefreshListView使用(三)

轉(zhuǎn)載請標(biāo)明出處：

http://www.itdecent.cn/p/1f94411af33d

本文出自:【江清清博客-代號獨(dú)狼】

(一):寫在前面的話

接著上一篇繼續(xù)更新，上一篇文章已經(jīng)把FastDev4Android項(xiàng)目新增圖片自動(dòng)無限輪播，包括項(xiàng)目結(jié)構(gòu)已經(jīng)需要進(jìn)行完善的功能，那么今天我們繼續(xù)完善這個(gè)項(xiàng)目；今天我們會再項(xiàng)目添加下拉刷新組件以及組件實(shí)現(xiàn)講解和使用基本方法;

(二):基本實(shí)現(xiàn)

這邊我們采用繼承Listview控件來擴(kuò)展下拉刷新的功能，主要在listview的頭部添加一個(gè)下拉刷新的view，然后監(jiān)聽OnScrollListener滾動(dòng)接口和實(shí)現(xiàn)onTouchEvent方法來處理。進(jìn)行下拉listview滑動(dòng)到指定的高度，然后接口回調(diào)加載刷新方法即可。

效果如下:

(三):詳細(xì)實(shí)現(xiàn):

這邊主要看幾個(gè)重點(diǎn)地方，詳細(xì)的代碼到項(xiàng)目中查看即可

onTouchEvent處理方法

code-lang

/

touch事件處理

@param event

@return

/

@Override

public boolean onTouchEvent(MotionEvent event) {

final int y = (int) event.getY();

switch (event.getAction()) {

case MotionEvent.ACTIONDOWN:

mLastMotionY = y;

break;

case MotionEvent.ACTIONMOVE:

int offsetY = (int) event.getY();

int deltY = Math.round(offsetY - mLastMotionY);

mLastMotionY = offsetY;

if (getFirstVisiblePosition() == 0 && mRefreshState != REFRESHING) {

deltY = deltY / 2;

mRefreshOriginalTopPadding += deltY;

if (mRefreshOriginalTopPadding < -mRefreshViewHeight) {

mRefreshOriginalTopPadding = -mRefreshViewHeight;

}

resetHeaderPadding();

}

break;

case MotionEvent.ACTIONUP:

//當(dāng)手指抬開得時(shí)候 進(jìn)行判斷下拉的距離 ，如果>=臨界值，那么進(jìn)行刷洗，否則回歸原位

if (!isVerticalScrollBarEnabled()) {

setVerticalScrollBarEnabled(true);

}

if (getFirstVisiblePosition() == 0 && mRefreshState != REFRESHING) {

if (mRefreshView.getBottom() >= mRefreshViewHeight

&& mRefreshState == RELEASETOREFRESH) {

//準(zhǔn)備開始刷新

prepareForRefresh();

} else {

// Abort refresh

resetHeader();

}

}

break;

}

return super.onTouchEvent(event);

}

onScrooll和onScrollStateChanged處理listview滑動(dòng)過程中，實(shí)時(shí)改變頭部view(pull view)上面的數(shù)據(jù)效果顯示：

code-lang

@Override

public void onScroll(AbsListView view, int firstVisibleItem,

int visibleItemCount, int totalItemCount) {

if (mCurrentScrollState == SCROLLSTATETOUCHSCROLL && mRefreshState != REFRESHING) {

if (firstVisibleItem == 0) {

if ((mRefreshView.getBottom() >= mRefreshViewHeight)

&& mRefreshState != RELEASETOREFRESH) {

mRefreshViewText.setText(R.string.pulltorefreshreleaselabelit);

mRefreshViewImage.clearAnimation();

mRefreshViewImage.startAnimation(mFlipAnimation);

mRefreshState = RELEASETOREFRESH;

} else if (mRefreshView.getBottom() < mRefreshViewHeight

&& mRefreshState != PULLTOREFRESH) {

mRefreshViewText.setText(R.string.pulltorefreshpulllabelit);

mRefreshViewImage.clearAnimation();

mRefreshViewImage.startAnimation(mReverseFlipAnimation);

mRefreshState = PULLTOREFRESH;

}

}

}

if (mOnScrollListener != null) {

mOnScrollListener.onScroll(view, firstVisibleItem, visibleItemCount, totalItemCount);

}

}

@Override

public void onScrollStateChanged(AbsListView view, int scrollState) {

mCurrentScrollState = scrollState;

if (mOnScrollListener != null) {

mOnScrollListener.onScrollStateChanged(view, scrollState);

}

}

使用方法如下:

code-lang

package com.chinaztt.fda.test;

import android.os.Bundle;

import android.os.Handler;

import android.os.Message;

import android.text.Layout;

import android.view.LayoutInflater;

import android.view.View;

import android.view.ViewGroup;

import android.widget.AbsListView;

import android.widget.AdapterView;

import android.widget.BaseAdapter;

import android.widget.LinearLayout;

import android.widget.ProgressBar;

import android.widget.TextView;

import com.chinaztt.fda.ui.R;

import com.chinaztt.fda.ui.base.BaseActivity;

import com.chinaztt.fda.utils.UIUtils;

import com.chinaztt.fda.widget.PullToRefreshListView;

import java.util.ArrayList;

import java.util.List;

/

當(dāng)前類注釋:下拉刷新，上拉加載更多組件實(shí)例

項(xiàng)目名：FastDev4Android

包名：com.chinaztt.fda.test

作者：江清清 on 15/10/23 11:25

郵箱：jiangqqlmj@163.com

QQ： 781931404

公司：江蘇中天科技軟件技術(shù)有限公司

/

public class PullListviewActivity extends BaseActivity{

private PullToRefreshListView lvpullitem;

private PullAdapter mPullAdapter;

private LayoutInflater mInflater;

private List mTitles;

private View loadmore;

private TextView loadmoretv; // listview底部加載view 顯示數(shù)據(jù)

private ProgressBar loadmoreprogress; // listview底部加載view 顯示進(jìn)度

private LinearLayout loadnextpagelayout;

private Handler newHandler=new Handler()

{

@Override

public void handleMessage(Message msg) {

super.handleMessage(msg);

if(msg.what==1){

refreshTitles();

UIUtils.savePullToRefreshLastUpdateAt(lvpullitem,UIUtils.DEMOPULLTIMEKEY);

//刷新view

mPullAdapter.notifyDataSetChanged();

}else if(msg.what==2){

moreTitles();

//刷新view

mPullAdapter.notifyDataSetChanged();

showToastMsgShort("加載更多數(shù)據(jù)成功...");

loadmoretv.setText("數(shù)據(jù)加載完成");

}

}

};

@Override

protected void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.pulllistviewlayout);

lvpullitem=(PullToRefreshListView)this.findViewById(R.id.lvpullitem);

mInflater=getLayouInflater();

//特別注意 里邊的view的控件可以根據(jù)當(dāng)前的狀態(tài) 修改字符串信息

loadmore = mInflater.inflate(R.layout.loadmorefootviewlayout,

null);

loadmoretv = (TextView) loadmore

.findViewById(R.id.loadnextpagetext);

loadmoreprogress = (ProgressBar) loadmore

.findViewById(R.id.loadnextpageprogress);

loadnextpagelayout = (LinearLayout) loadmore

.findViewById(R.id.loadnextpagelayout);

//listview添加尾部 上拉加載更多view

lvpullitem.addFooterView(loadmore, null, false);

loadmoretv.setText("上拉加載更多數(shù)據(jù)...");

initTitles();

//初始化 上次下拉刷新的時(shí)間

UIUtils.setPullToRefreshLastUpdated(lvpullitem,UIUtils.DEMOPULLTIMEKEY);

mPullAdapter=new PullAdapter();

lvpullitem.setAdapter(mPullAdapter);

//listview item點(diǎn)擊事件處理

lvpullitem.setOnItemClickListener(new AdapterView.OnItemClickListener() {

@Override

public void onItemClick(AdapterView parent, View view, int position, long id) {

int index = position++;

showToastMsgShort("點(diǎn)擊了第:" + index + "個(gè)item");

}

});

//listview 開始下拉刷新回調(diào)函數(shù)

lvpullitem.setOnRefreshListener(new PullToRefreshListView.OnRefreshListener() {

@Override

public void onRefresh() {

//進(jìn)行加載數(shù)據(jù)

new Thread(new Runnable() {

@Override

public void run() {

try {

Thread.sleep(5000);

newHandler.sendEmptyMessage(1);

} catch (InterruptedException e) {

e.printStackTrace();

}

}

}).start();

}

});

//listview 滑動(dòng) 進(jìn)行上拉加載更多

lvpullitem.setOnScrollListener(new AbsListView.OnScrollListener() {

@Override

public void onScrollStateChanged(AbsListView view, int scrollState) {

if (scrollState == AbsListView.OnScrollListener.SCROLLSTATEIDLE) {

if (lvpullitem.getLastVisiblePosition() == (lvpullitem

.getCount() - 1)) {

loadmoretv.setText("正在加載最新數(shù)據(jù)....");

//進(jìn)行獲取最新數(shù)據(jù)

new Thread(new Runnable() {

@Override

public void run() {

try {

Thread.sleep(5000);

newHandler.sendEmptyMessage(2);

} catch (InterruptedException e) {

e.printStackTrace();

}

}

}).start();

}

}

if (scrollState == AbsListView.OnScrollListener.SCROLLSTATEFLING) {

//正在滑動(dòng)中，當(dāng)前l(fā)istview正在滑動(dòng) 可以暫停圖片加載器或者其他一些耗時(shí)操作

} else {

}

}

@Override

public void onScroll(AbsListView view, int firstVisibleItem, int visibleItemCount, int totalItemCount) {

}

});

}

private void initTitles(){

mTitles=new ArrayList();

for(int i=0;i<20;i++){

int index=i+1;

mTitles.add("當(dāng)前是:"+index+"");

}

}

private void refreshTitles(){

List newTitles=new ArrayList();

for(int i=0;i<5;i++){

int index=i+1;

newTitles.add("新數(shù)據(jù)是:"+index+"");

}

newTitles.addAll(mTitles);

mTitles.removeAll(mTitles);

mTitles.addAll(newTitles);

}

private void moreTitles(){

List newTitles=new ArrayList();

for(int i=0;i<8;i++){

int index=i+1;

newTitles.add("更多數(shù)據(jù)是:"+index+"");

}

mTitles.addAll(newTitles);

}

class PullAdapter extends BaseAdapter{

@Override

public int getCount() {

return mTitles.size();

}

@Override

public Object getItem(int position) {

return mTitles.get(position);

}

@Override

public long getItemId(int position) {

return position;

}

@Override

public View getView(int position, View convertView, ViewGroup parent) {

HondlerHondler=null;

if(convertView==null){

Hondler=new Hondler();

convertView=mInflater.inflate(R.layout.lvmainitem,null);

Hondler.tvitem=(TextView)convertView.findViewById(R.id.tvitem);

convertView.setTag(Hondler);

}else

{

Hondler=(Hondler)convertView.getTag();

}

Hondler.tvitem.setText(mTitles.get(position));

return convertView;

}

}

static class Hondler{

TextView tvitem;

}

}

以上也是PullToRefreshListView的實(shí)現(xiàn)重點(diǎn)代碼和基本使用效果，整個(gè)控件的功能實(shí)現(xiàn)代碼如下:

code-lang

package com.chinaztt.fda.widget;

import android.content.Context;

import android.util.AttributeSet;

import android.view.MotionEvent;

import android.view.View;

import android.view.View.OnClickListener;

import android.view.animation.LinearInterpolator;

import android.view.animation.RotateAnimation;

import android.widget.AbsListView;

import android.widget.AbsListView.OnScrollListener;

import android.widget.ImageView;

import android.widget.LinearLayout;

import android.widget.ListView;

import android.widget.ProgressBar;

import android.widget.TextView;

import com.chinaztt.fda.ui.R;

import com.chinaztt.fda.utils.Log;

/

當(dāng)前類注釋:下拉刷新，上拉加載更多組件

項(xiàng)目名：FastDev4Android

包名：com.chinaztt.fda.widget

作者：江清清 on 15/10/23 13:32

郵箱：jiangqqlmj@163.com

QQ： 781931404

公司：江蘇中天科技軟件技術(shù)有限公司

/

public class PullToRefreshListView extends ListView implements OnScrollListener, OnClickListener {

/

下拉狀態(tài)

/

private static final int PULLTOREFRESH = 1; //下拉-默認(rèn)為初始狀態(tài) 準(zhǔn)備下拉刷新

private static final int RELEASETOREFRESH = 2; //釋放刷新

private static final int REFRESHING = 3; //正在刷新

private static final String TAG = "PullRefreshListView";

private OnRefreshListener mOnRefreshListener;

/

組件滑動(dòng)監(jiān)聽器 scroll 當(dāng)view在進(jìn)行下拉滑動(dòng)的時(shí)候，判斷滑動(dòng)的距離，

如果達(dá)到可以進(jìn)行刷新的臨界點(diǎn)時(shí)候，回調(diào)當(dāng)前接口中的方法

Listener that will receive notifications every time the list scrolls.

/

private OnScrollListener mOnScrollListener;

//下拉刷新的的頭部view

private LinearLayout mRefreshView;

private ImageView mRefreshViewImage;

private ProgressBar mRefreshViewProgress;

private TextView mRefreshViewText;

private TextView mRefreshViewLastUpdated;

private int mRefreshState;

private int mCurrentScrollState;

private RotateAnimation mFlipAnimation;

private RotateAnimation mReverseFlipAnimation;

private int mRefreshViewHeight;

private int mRefreshOriginalTopPadding;

private int mLastMotionY;

public PullToRefreshListView(Context context) {

super(context);

init(context);

}

public PullToRefreshListView(Context context, AttributeSet attrs) {

super(context, attrs);

init(context);

}

private void init(Context context) {

mFlipAnimation = new RotateAnimation(0, -180,

RotateAnimation.RELATIVETOSELF, 0.5f,

RotateAnimation.RELATIVETOSELF, 0.5f);

mFlipAnimation.setInterpolator(new LinearInterpolator());

mFlipAnimation.setDuration(250);

mFlipAnimation.setFillAfter(true);

mReverseFlipAnimation = new RotateAnimation(-180, 0,

RotateAnimation.RELATIVETOSELF, 0.5f,

RotateAnimation.RELATIVETOSELF, 0.5f);

mReverseFlipAnimation.setInterpolator(new LinearInterpolator());

mReverseFlipAnimation.setDuration(250);

mReverseFlipAnimation.setFillAfter(true);

mRefreshView = (LinearLayout) View.inflate(context, R.layout.pulltorefreshheader, null);

mRefreshViewText = (TextView) mRefreshView.findViewById(R.id.pulltorefreshtext);

mRefreshViewImage = (ImageView) mRefreshView.findViewById(R.id.pulltorefreshimage);

mRefreshViewProgress = (ProgressBar) mRefreshView.findViewById(R.id.pulltorefreshprogress);

mRefreshViewLastUpdated = (TextView) mRefreshView.findViewById(R.id.pulltorefreshupdatedat);

mRefreshState = PULLTOREFRESH;

mRefreshViewImage.setMinimumHeight(50); //設(shè)置下拉最小的高度為50

setFadingEdgeLength(0);

setHeaderDividersEnabled(false);

//把refreshview加入到listview的頭部

addHeaderView(mRefreshView);

super.setOnScrollListener(this);

mRefreshView.setOnClickListener(this);

mRefreshView.measure(MeasureSpec.UNSPECIFIED, MeasureSpec.UNSPECIFIED);

mRefreshViewHeight = mRefreshView.getMeasuredHeight();

mRefreshOriginalTopPadding = -mRefreshViewHeight;

resetHeaderPadding();

}

/

Set the listener that will receive notifications every time the list scrolls.

@param l The scroll listener.

/

@Override

public void setOnScrollListener(OnScrollListener l) {

mOnScrollListener = l;

}

/

注冊listview下拉刷新回到接口

Register a callback to be invoked when this list should be refreshed.

@param onRefreshListener The callback to run.

/

public void setOnRefreshListener(OnRefreshListener onRefreshListener) {

mOnRefreshListener = onRefreshListener;

}

/

進(jìn)行設(shè)置設(shè)置上一次更新的時(shí)候

Set a text to represent when the list was last updated.

@param lastUpdated Last updated at.

/

public void setLastUpdated(CharSequence lastUpdated) {

if (lastUpdated != null) {

mRefreshViewLastUpdated.setVisibility(View.VISIBLE);

mRefreshViewLastUpdated.setText(lastUpdated);

} else {

mRefreshViewLastUpdated.setVisibility(View.GONE);

}

}

/

touch事件處理

@param event

@return

/

@Override

public boolean onTouchEvent(MotionEvent event) {

final int y = (int) event.getY();

switch (event.getAction()) {

case MotionEvent.ACTIONDOWN:

mLastMotionY = y;

break;

case MotionEvent.ACTIONMOVE:

int offsetY = (int) event.getY();

int deltY = Math.round(offsetY - mLastMotionY);

mLastMotionY = offsetY;

if (getFirstVisiblePosition() == 0 && mRefreshState != REFRESHING) {

deltY = deltY / 2;

mRefreshOriginalTopPadding += deltY;

if (mRefreshOriginalTopPadding < -mRefreshViewHeight) {

mRefreshOriginalTopPadding = -mRefreshViewHeight;

}

resetHeaderPadding();

}

break;

case MotionEvent.ACTIONUP:

//當(dāng)手指抬開得時(shí)候 進(jìn)行判斷下拉的距離 ，如果>=臨界值，那么進(jìn)行刷洗，否則回歸原位

if (!isVerticalScrollBarEnabled()) {

setVerticalScrollBarEnabled(true);

}

if (getFirstVisiblePosition() == 0 && mRefreshState != REFRESHING) {

if (mRefreshView.getBottom() >= mRefreshViewHeight

&& mRefreshState == RELEASETOREFRESH) {

//準(zhǔn)備開始刷新

prepareForRefresh();

} else {

// Abort refresh

resetHeader();

}

}

break;

}

return super.onTouchEvent(event);

}

@Override

public void onScroll(AbsListView view, int firstVisibleItem,

int visibleItemCount, int totalItemCount) {

if (mCurrentScrollState == SCROLLSTATETOUCHSCROLL && mRefreshState != REFRESHING) {

if (firstVisibleItem == 0) {

if ((mRefreshView.getBottom() >= mRefreshViewHeight)

&& mRefreshState != RELEASETOREFRESH) {

mRefreshViewText.setText(R.string.pulltorefreshreleaselabelit);

mRefreshViewImage.clearAnimation();

mRefreshViewImage.startAnimation(mFlipAnimation);

mRefreshState = RELEASETOREFRESH;

} else if (mRefreshView.getBottom() < mRefreshViewHeight

&& mRefreshState != PULLTOREFRESH) {

mRefreshViewText.setText(R.string.pulltorefreshpulllabelit);

mRefreshViewImage.clearAnimation();

mRefreshViewImage.startAnimation(mReverseFlipAnimation);

mRefreshState = PULLTOREFRESH;

}

}

}

if (mOnScrollListener != null) {

mOnScrollListener.onScroll(view, firstVisibleItem, visibleItemCount, totalItemCount);

}

}

@Override

public void onScrollStateChanged(AbsListView view, int scrollState) {

mCurrentScrollState = scrollState;

if (mOnScrollListener != null) {

mOnScrollListener.onScrollStateChanged(view, scrollState);

}

}

/

Sets the header padding back to original size.

/

private void resetHeaderPadding() {

mRefreshView.setPadding(

mRefreshView.getPaddingLeft(),

mRefreshOriginalTopPadding,

mRefreshView.getPaddingRight(),

mRefreshView.getPaddingBottom());

}

public void prepareForRefresh() {

if (mRefreshState != REFRESHING) {

mRefreshState = REFRESHING;

mRefreshOriginalTopPadding = 0;

resetHeaderPadding();

mRefreshViewImage.clearAnimation();

mRefreshViewImage.setVisibility(View.GONE);

mRefreshViewProgress.setVisibility(View.VISIBLE);

mRefreshViewText.setText(R.string.pulltorefreshrefreshinglabelit);

onRefresh();

}

}

private void resetHeader() {

mRefreshState = PULLTOREFRESH;

mRefreshOriginalTopPadding = -mRefreshViewHeight;

resetHeaderPadding();

mRefreshViewImage.clearAnimation();

mRefreshViewImage.setVisibility(View.VISIBLE);

mRefreshViewProgress.setVisibility(View.GONE);

mRefreshViewText.setText(R.string.pulltorefreshpulllabelit);

}

/

開始回調(diào)刷新

/

public void onRefresh() {

Log.d(TAG, "onRefresh");

if (mOnRefreshListener != null) {

mOnRefreshListener.onRefresh();

}

}

/

Resets the list to a normal state after a refresh.

/

public void onRefreshComplete() {

Log.d(TAG, "onRefreshComplete");

resetHeader();

}

@Override

public void onClick(View v) {

Log.d(TAG, "onClick");

}

/

Interface definition for a callback to be invoked when list should be

refreshed.

/

public interface OnRefreshListener {

/

Called when the list should be refreshed.

A call to {@link PullToRefreshListView #onRefreshComplete()} is

expected to indicate that the refresh has completed.

/

public void onRefresh();

}

}

核心實(shí)現(xiàn)類的代碼就這些，其實(shí)整個(gè)文件讀下來，實(shí)現(xiàn)起來也不難的吧大家可以根據(jù)上面的代碼可以修改定制成自己的控件都沒問題的希望可以幫助到大家，如果需要整個(gè)demo源代碼可以去Github中下載整個(gè)項(xiàng)目:https://github.com/jiangqqlmj/FastDev4Android

同時(shí)歡迎大家star和fork整個(gè)開源快速開發(fā)框架項(xiàng)目如果有什么意見和反饋，歡迎留言，必定第一時(shí)間回復(fù)。也歡迎有同樣興趣的童鞋加入到該項(xiàng)目中來，一起維護(hù)該項(xiàng)目。

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