Android下拉刷新组件—PullToRefresh
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介绍
下拉刷新,几乎是每个 Android 应用都会需要的功能。 android-Ultra-Pull-To-Refresh (以下简称 UltraPTR )便是一个强大的 Andriod 下拉刷新框架。
主要特点:
(1).继承于 ViewGroup , Content 可以包含任何 View 。
(2).简洁完善的 Header 抽象,方便进行拓展,构建符合需求的头部。
PullToRefresh是一套实现非常好的下拉刷新库,它支持:
ListView
ExpandableListView
GridView
WebView
ScrollView
HorizontalScrollView
ViewPager
点击查看Github
源码分析
PullToRefreshListView使用
1.下载项目包,将library包导入即可,其他的包暂时不用
2.分析源码,看我们可以设置的有哪些
<?xml version="1.0" encoding="utf-8"?><resources> <declare-styleable name="PullToRefresh"> <!-- 设置刷新view的背景 --> <attr name="ptrRefreshableViewBackground" format="reference|color" /> <!-- 设置头部view的背景 --> <attr name="ptrHeaderBackground" format="reference|color" /> <!-- 设置头部/底部文字的颜色 --> <attr name="ptrHeaderTextColor" format="reference|color" /> <!-- 设置头部/底部副标题的文字颜色 --> <attr name="ptrHeaderSubTextColor" format="reference|color" /> <!-- 设置下拉刷新的模式,有多重方式可选。无刷新功能,从顶部刷新,从底部刷新,二者都有,只允许手动刷新 --> <attr name="ptrMode"> <flag name="disabled" value="0x0" /> <flag name="pullFromStart" value="0x1" /> <flag name="pullFromEnd" value="0x2" /> <flag name="both" value="0x3" /> <flag name="manualOnly" value="0x4" /> <!-- 这两个属性不推荐了,用上面的代替即可 --> <flag name="pullDownFromTop" value="0x1" /> <flag name="pullUpFromBottom" value="0x2" /> </attr> <!-- 是否显示指示箭头 --> <attr name="ptrShowIndicator" format="reference|boolean" /> <!-- 指示箭头的图片 --> <attr name="ptrDrawable" format="reference" /> <!-- 顶部指示箭头的图片,设置后会覆盖ptrDrawable中顶部的设置 --> <attr name="ptrDrawableStart" format="reference" /> <!-- 底部指示箭头的图片,设置后会覆盖ptrDrawable中底部的设置 --> <attr name="ptrDrawableEnd" format="reference" /> <attr name="ptrOverScroll" format="reference|boolean" /> <!-- 设置文字的基本字体 --> <attr name="ptrHeaderTextAppearance" format="reference" /> <!-- 设置副标题的基本字体 --> <attr name="ptrSubHeaderTextAppearance" format="reference" /> <!-- 设置下拉时标识图的动画,默认为rotate --> <attr name="ptrAnimationStyle"> <flag name="rotate" value="0x0" /> <flag name="flip" value="0x1" /> </attr> <!-- 设置刷新时是否允许滚动,一般为true --> <attr name="ptrScrollingWhileRefreshingEnabled" format="reference|boolean" /> <!-- 允许在listview中添加头/尾视图 --> <attr name="ptrListViewExtrasEnabled" format="reference|boolean" /> <!-- 当设置rotate时,可以用这个来设置刷新时旋转的图片 --> <attr name="ptrRotateDrawableWhilePulling" format="reference|boolean" /> <!-- BELOW HERE ARE DEPRECEATED. DO NOT USE. --> <attr name="ptrAdapterViewBackground" format="reference|color" /> <attr name="ptrDrawableTop" format="reference" /> <attr name="ptrDrawableBottom" format="reference" /> </declare-styleable></resources>
设置Mode
PullToRefreshListView mListView = (PullToRefreshListView) findViewById(R.id.list_view); mListView.setMode(Mode.BOTH);
Mode.BOTH:同时支持上拉下拉
Mode.PULL_FROM_START:只支持下拉Pulling Down
Mode.PULL_FROM_END:只支持上拉Pulling Up
3.开始用它建立自己的工程
设置布局文件
就是插入PullToRefreshListView
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent" android:layout_height="match_parent" tools:context="${relativePackage}.${activityClass}" android:background="#000000"><!-- The PullToRefreshListView replaces a standard ListView widget. --> <com.handmark.pulltorefresh.library.PullToRefreshListView xmlns:ptr="http://schemas.android.com/apk/res-auto" android:id="@+id/pull_refresh_list" android:layout_width="fill_parent" android:layout_height="fill_parent" android:cacheColorHint="#000000" android:divider="#19000000" android:dividerHeight="4dp" android:fadingEdge="none" android:fastScrollEnabled="false" android:footerDividersEnabled="false" android:headerDividersEnabled="false" android:smoothScrollbar="true" ptr:ptrAnimationStyle="rotate" ptr:ptrHeaderTextColor="#ffffff" ptr:ptrHeaderSubTextColor="#00ffff" ptr:ptrHeaderBackground="@null" ptr:ptrDrawable="@drawable/ic_launcher"/></RelativeLayout>
开始编写代码
1.找到这个控件,并且设置监听器
这里面用到了一个日期的工具类,其实就是设置上次下拉的时间的。此外在下拉后会触发一个异步任务
package com.kale.ptrlistviewtest;import java.util.Arrays;import java.util.LinkedList;import android.app.Activity;import android.os.Bundle;import android.text.format.DateUtils;import android.widget.ArrayAdapter;import android.widget.ListView;import android.widget.Toast;import com.handmark.pulltorefresh.library.PullToRefreshBase;import com.handmark.pulltorefresh.library.PullToRefreshBase.Mode;import com.handmark.pulltorefresh.library.PullToRefreshBase.OnLastItemVisibleListener;import com.handmark.pulltorefresh.library.PullToRefreshBase.OnRefreshListener;import com.handmark.pulltorefresh.library.PullToRefreshBase.State;import com.handmark.pulltorefresh.library.PullToRefreshListView;import com.handmark.pulltorefresh.library.extras.SoundPullEventListener;public class MainActivity extends Activity { //一个可以下拉刷新的listView对象 private PullToRefreshListView mPullRefreshListView; //普通的listview对象 private ListView actualListView; //添加一个链表数组,来存放string数组,这样就可以动态增加string数组中的内容了 private LinkedList<String> mListItems; //给listview添加一个普通的适配器 private ArrayAdapter<String> mAdapter; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); initView(); //一打开应用就自动刷新,下面语句可以写到刷新按钮里面 mPullRefreshListView.setRefreshing(true); //new GetDataTask(mPullRefreshListView, mAdapter, mListItems).execute(); //mPullRefreshListView.setRefreshing(false); } private void initView() { initPTRListView(); initListView(); } /** * 设置下拉刷新的listview的动作 */ private void initPTRListView() { mPullRefreshListView = (PullToRefreshListView) findViewById(R.id.pull_refresh_list); //设置拉动监听器 mPullRefreshListView.setOnRefreshListener(new OnRefreshListener<ListView>() { @Override public void onRefresh(PullToRefreshBase<ListView> refreshView) { //设置下拉时显示的日期和时间 String label = DateUtils.formatDateTime(getApplicationContext(), System.currentTimeMillis(), DateUtils.FORMAT_SHOW_TIME | DateUtils.FORMAT_SHOW_DATE | DateUtils.FORMAT_ABBREV_ALL); // 更新显示的label refreshView.getLoadingLayoutProxy().setLastUpdatedLabel(label); // 开始执行异步任务,传入适配器来进行数据改变 new GetDataTask(mPullRefreshListView, mAdapter,mListItems).execute(); } }); // 添加滑动到底部的监听器 mPullRefreshListView.setOnLastItemVisibleListener(new OnLastItemVisibleListener() { @Override public void onLastItemVisible() { Toast.makeText(getApplication(), "已经到底了", Toast.LENGTH_SHORT).show(); } }); //mPullRefreshListView.isScrollingWhileRefreshingEnabled();//看刷新时是否允许滑动 //在刷新时允许继续滑动 mPullRefreshListView.setScrollingWhileRefreshingEnabled(true); //mPullRefreshListView.getMode();//得到模式 //上下都可以刷新的模式。这里有两个选择:Mode.PULL_FROM_START,Mode.BOTH,PULL_FROM_END mPullRefreshListView.setMode(Mode.BOTH); /** * 设置反馈音效 */ SoundPullEventListener<ListView> soundListener = new SoundPullEventListener<ListView>(this); soundListener.addSoundEvent(State.PULL_TO_REFRESH, R.raw.pull_event); soundListener.addSoundEvent(State.RESET, R.raw.reset_sound); soundListener.addSoundEvent(State.REFRESHING, R.raw.refreshing_sound); mPullRefreshListView.setOnPullEventListener(soundListener); } /** * 设置listview的适配器 */ private void initListView() { //通过getRefreshableView()来得到一个listview对象 actualListView = mPullRefreshListView.getRefreshableView(); String []data = new String[] {"android","ios","wp","java","c++","c#"}; mListItems = new LinkedList<String>(); //把string数组中的string添加到链表中 mListItems.addAll(Arrays.asList(data)); mAdapter = new ArrayAdapter<>(getApplicationContext(), android.R.layout.simple_list_item_1, mListItems); actualListView.setAdapter(mAdapter); }}
3.写一个异步任务,来模仿从网络加载数据
这里要注意的是,加载完后要出发刷新完成和通知适配器改变的方法
public class GetDataTask extends AsyncTask<Void, Void, Void>{ private PullToRefreshListView mPullRefreshListView; private ArrayAdapter<String> mAdapter; private LinkedList<String> mListItems; public GetDataTask(PullToRefreshListView listView, ArrayAdapter<String> adapter,LinkedList<String> listItems) { // TODO 自动生成的构造函数存根 mPullRefreshListView = listView; mAdapter = adapter; mListItems = listItems; } @Override protected Void doInBackground(Void... params) { //模拟请求 try { Thread.sleep(2000); } catch (InterruptedException e) { } return null; } @Override protected void onPostExecute(Void result) { // TODO 自动生成的方法存根 super.onPostExecute(result); //得到当前的模式 Mode mode = mPullRefreshListView.getCurrentMode(); if(mode == Mode.PULL_FROM_START) { mListItems.addFirst("这是刷新出来的数据"); } else { mListItems.addLast("这是刷新出来的数据"); } // 通知数据改变了 mAdapter.notifyDataSetChanged(); // 加载完成后停止刷新 mPullRefreshListView.onRefreshComplete(); }}
PullToRefreshGridView使用方法
思路:
1.写布局文件,放入可以下拉刷新的控件
2.找到下拉刷新的控件,设置监听器,并且在刷新方法中开启一个异步任务来操作
3.通过这个下拉刷新控件的getRefreshableView()方法来得到GridView对象,按照正常的操作来设置适配器
4.在异步任务中通过LinkedList来给头部或者是尾部添加新的数据
实现:
<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:orientation="vertical" android:layout_width="fill_parent" android:layout_height="fill_parent" ><!-- The PullToRefreshGridView replaces a standard GridView widget. --> <com.handmark.pulltorefresh.library.PullToRefreshGridView xmlns:ptr="http://schemas.android.com/apk/res-auto" android:id="@+id/pull_refresh_grid" android:layout_height="fill_parent" android:layout_width="fill_parent" android:numColumns="auto_fit" android:verticalSpacing="1dp" android:horizontalSpacing="1dp" android:columnWidth="100dp" android:stretchMode="columnWidth" android:gravity="fill" ptr:ptrMode="both" ptr:ptrDrawable="@drawable/ic_launcher" /></LinearLayout>
2.找到这个可以下拉刷新的控件,并且设置监听器
这里的监听器和上篇文章讲的不同,是双向的。所以很方便监听滑动操作!
这里也可以设置适配器中无数据时显示的内容,调用的方法是:setEmptyView()
public class MainActivity extends Activity { //链表数组对象,用来方便添加string对象 private LinkedList<String> mListItems; //用来下拉刷新的控件 private PullToRefreshGridView mPullRefreshGridView; //真正用到的控件,它被隐含到PullToRefreshGridView中,所以需要找出来才能使用 private GridView mGridView; //定义GridView的适配器 private ArrayAdapter<String> mAdapter; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); initView(); } private void initView() { // TODO 自动生成的方法存根 initPTRGrideView(); initGrideView(); } /** *设置下拉刷新的view,设置双向监听器 */ private void initPTRGrideView() { // 得到下拉刷新的GridView mPullRefreshGridView = (PullToRefreshGridView) findViewById(R.id.pull_refresh_grid); // 设置监听器,这个监听器是可以监听双向滑动的,这样可以触发不同的事件 mPullRefreshGridView.setOnRefreshListener(new OnRefreshListener2<GridView>() { @Override public void onPullDownToRefresh(PullToRefreshBase<GridView> refreshView) { Toast.makeText(getApplicationContext(), "下拉", Toast.LENGTH_SHORT).show(); new GetDataTask(mPullRefreshGridView, mAdapter, mListItems).execute(); } @Override public void onPullUpToRefresh(PullToRefreshBase<GridView> refreshView) { Toast.makeText(getApplicationContext(), "上拉", Toast.LENGTH_SHORT).show(); new GetDataTask(mPullRefreshGridView, mAdapter, mListItems).execute(); } }); } /** * 设置GridView,首先找到它,然后设置适配器 */ private void initGrideView() { mGridView = mPullRefreshGridView.getRefreshableView(); //定义String数组,然后把它放到LinkedList中,之后只要在异步任务中用LinkedList就可以添加开头和结尾的数据了 String []data = new String[] {"android","ios","wp","java","c++","c#"}; mListItems = new LinkedList<String>(); mListItems.addAll(Arrays.asList(data)); //当适配器中没有数据的时候显示的东西,这里因为我给适配器中填充了string数组,所以不会显示“这里很空,下拉刷新试试” TextView tv = new TextView(this); tv.setGravity(Gravity.CENTER); tv.setText("这里很空,下拉刷新试试"); //当界面为空的时候显示的视图 mPullRefreshGridView.setEmptyView(tv); //设置适配器 mAdapter = new ArrayAdapter<String>(this, android.R.layout.simple_list_item_1, mListItems); mGridView.setAdapter(mAdapter); }}
public class GetDataTask extends AsyncTask<Void, Void, Void>{ private PullToRefreshGridView mPullRefreshGridView; private ArrayAdapter<String> mAdapter; private LinkedList<String> mListItems; public GetDataTask(PullToRefreshGridView gridView, ArrayAdapter<String> adapter,LinkedList<String> listItems) { // TODO 自动生成的构造函数存根 mPullRefreshGridView = gridView; mAdapter = adapter; mListItems = listItems; } @Override protected Void doInBackground(Void... params) { //模拟请求,舒眠2秒钟 try { Thread.sleep(2000); } catch (InterruptedException e) { } return null; } @Override protected void onPostExecute(Void result) { // TODO 自动生成的方法存根 super.onPostExecute(result); //得到当前的模式,来判断数据应该加载到哪个位置 Mode mode = mPullRefreshGridView.getCurrentMode(); if(mode == Mode.PULL_FROM_START) { mListItems.addFirst("这是刷新出来的数据"); } else { mListItems.addLast("这是刷新出来的数据"); } // 通知数据改变了 mAdapter.notifyDataSetChanged(); // 加载完成后停止刷新 mPullRefreshGridView.onRefreshComplete(); }}
PullToRefreshScrollView 使用
和ScrollView不同的是,这里不用放一个linearLayout来做内容的容器,直接放入要显示的东西就行。
<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="fill_parent" android:layout_height="fill_parent" android:orientation="vertical" > pulltorefresh.library.PullToRefreshScrollView xmlns:ptr="http://schemas.android.com/apk/res-auto" android:id="@+id/pull_refresh_scrollview" android:layout_width="fill_parent" android:layout_height="fill_parent" ptr:ptrAnimationStyle="flip" ptr:ptrMode="both" > <TextView android:layout_width="fill_parent" android:layout_height="fill_parent" android:padding="8dp" android:text="@string/filler_text" android:textSize="16sp" /> </com.handmark.pulltorefresh.library.PullToRefreshScrollView></LinearLayout>
2.找到控件并进行设置
public final class PullToRefreshScrollViewActivity extends Activity { PullToRefreshScrollView mPullRefreshScrollView; ScrollView mScrollView; @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_ptr_scrollview); //找到控件 mPullRefreshScrollView = (PullToRefreshScrollView) findViewById(R.id.pull_refresh_scrollview); //设置监听器,监听器中执行异步任务 mPullRefreshScrollView.setOnRefreshListener(new OnRefreshListener<ScrollView>() { @Override public void onRefresh(PullToRefreshBase<ScrollView> refreshView) { new GetDataTask().execute(); } }); mScrollView = mPullRefreshScrollView.getRefreshableView(); } private class GetDataTask extends AsyncTask<Void, Void, String[]> { @Override protected String[] doInBackground(Void... params) { try { Thread.sleep(4000); } catch (InterruptedException e) { } return null; } @Override protected void onPostExecute(String[] result) { //注意:执行完后通知控件刷新完成 mPullRefreshScrollView.onRefreshComplete(); super.onPostExecute(result); } }}
下面是横向的ScrollView
1.布局文件,就是几个textview
<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="fill_parent" android:layout_height="fill_parent" android:orientation="vertical" > <!-- The PullToRefreshScrollView replaces a standard PullToRefreshScrollView widget. --> <com.handmark.pulltorefresh.library.PullToRefreshHorizontalScrollView xmlns:ptr="http://schemas.android.com/apk/res-auto" android:id="@+id/pull_refresh_horizontalscrollview" android:layout_width="fill_parent" android:layout_height="fill_parent" ptr:ptrAnimationStyle="flip" ptr:ptrMode="both" > <LinearLayout android:layout_width="wrap_content" android:layout_height="fill_parent" android:orientation="horizontal" > <TextView style="@style/HorizScrollViewItem" android:layout_width="wrap_content" android:layout_height="fill_parent" android:background="#ff99cc00" /> <TextView style="@style/HorizScrollViewItem" android:layout_width="wrap_content" android:layout_height="fill_parent" android:background="#ffff4444" /> <TextView style="@style/HorizScrollViewItem" android:layout_width="wrap_content" android:layout_height="fill_parent" android:background="#ff33b5e5" /> <TextView style="@style/HorizScrollViewItem" android:layout_width="wrap_content" android:layout_height="fill_parent" android:background="#ffcc0000" /> </LinearLayout> </com.handmark.pulltorefresh.library.PullToRefreshHorizontalScrollView></LinearLayout>
2.activity中的代码,和上面基本一样
public final class PullToRefreshHorizontalScrollViewActivity extends Activity { PullToRefreshHorizontalScrollView mPullRefreshScrollView; HorizontalScrollView mScrollView; @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_ptr_horizontalscrollview);mPullRefreshScrollView = (PullToRefreshHorizontalScrollView)findViewById(R.id.pull_refresh_horizontalscrollview); mPullRefreshScrollView.setOnRefreshListener(new OnRefreshListener<HorizontalScrollView>() { @Override public void onRefresh(PullToRefreshBase<HorizontalScrollView> refreshView) { new GetDataTask().execute(); } }); mScrollView = mPullRefreshScrollView.getRefreshableView(); } private class GetDataTask extends AsyncTask<Void, Void, String[]> { @Override protected String[] doInBackground(Void... params) { try { Thread.sleep(4000); } catch (InterruptedException e) { } return null; } @Override protected void onPostExecute(String[] result) { mPullRefreshScrollView.onRefreshComplete(); super.onPostExecute(result); } }}
这里我们来注意下这部分
mPullRefreshScrollView = (PullToRefreshHorizontalScrollView) findViewById(R.id.pull_refresh_horizontalscrollview); mPullRefreshScrollView.setOnRefreshListener(new OnRefreshListener<HorizontalScrollView>() { @Override public void onRefresh(PullToRefreshBase<HorizontalScrollView> refreshView) { new GetDataTask().execute(); } });
mPullRefreshScrollView.setOnRefreshListener(new OnRefreshListener<ScrollView>() { @Override public void onRefresh(PullToRefreshBase<ScrollView> refreshView) { new GetDataTask().execute(); } });
ViewPager使用方法
点击查看参考博客
- Android下拉刷新组件—PullToRefresh
- Android下拉刷新组件Android PullToRefresh使用方法
- android pulltorefresh 下拉刷新
- android Android-PullToRefresh 下拉刷新
- android Android-PullToRefresh 下拉刷新
- android控件 下拉刷新pulltorefresh
- android 之 下拉刷新PullToRefresh
- Android——PullToRefresh上拉加载下拉刷新
- android 控件 下拉刷新 Android-PullToRefresh
- android 控件 下拉刷新 android-pulltorefresh
- (4.2.7)【android开源组件】Android PullToRefresh (ListView GridView 下拉刷新) 使用详解
- android ActionBar-PullToRefresh 下拉刷新的使用方法
- Android-PullToRefresh:下拉刷新和加载更多
- Android下拉刷新框架PullToRefresh使用小结
- Android-设置PullToRefresh下拉刷新样式
- Android-设置PullToRefresh下拉刷新样式
- Android PullToRefresh上拉和下拉刷新
- Android-PullToRefresh下拉刷新库基本用法
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