Android-PullToRefresh下拉刷新库基本用法
ListView
ExpandableListView
GridView
WebView
ScrollView
HorizontalScrollView
ViewPager
等多种常用的需要刷新的View类型,而且使用起来也十分方便。
(下载地址:https://github.com/chrisbanes/Android-PullToRefresh)
PullToRefresh基本用法:
1、在布局文件中添加PullToRefresh控件,比如PullToRefreshListView;
2、在Activity中,设置监听器OnRefreshListener以响应用户下拉操作;
3、在监听器的onRefresh()方法中执行数据刷新操作,可以通过AsyncTask来实现;
4、在AsyncTask中获取到数据后,记得调用onRefreshComplete()方法通知PullToRefresh控件数据已获取完毕,可以结束刷新操作。
实例:PullToRefreshDemo
运行效果:
视图结构
代码清单:
布局文件:activity_main.xml
<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" android:paddingBottom="@dimen/activity_vertical_margin" android:paddingLeft="@dimen/activity_horizontal_margin" android:paddingRight="@dimen/activity_horizontal_margin" android:paddingTop="@dimen/activity_vertical_margin" tools:context=".MainActivity" > <com.handmark.pulltorefresh.library.PullToRefreshListView android:id="@+id/pull_to_refresh_listview" android:layout_height="fill_parent" android:layout_width="fill_parent" /> </RelativeLayout>
Java源代码文件:MainActivity.java
package com.rainsong.pulltorefreshdemo; import java.util.Arrays; import java.util.LinkedList; import android.app.Activity; import android.os.AsyncTask; import android.os.Bundle; import android.text.format.DateUtils; import android.view.Menu; import android.widget.ArrayAdapter; import android.widget.ListView; import com.handmark.pulltorefresh.library.PullToRefreshBase; import com.handmark.pulltorefresh.library.PullToRefreshBase.OnRefreshListener; import com.handmark.pulltorefresh.library.PullToRefreshListView; public class MainActivity extends Activity { private PullToRefreshListView mPullToRefreshListView; private LinkedList<String> mListItems; private ArrayAdapter<String> mAdapter; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); // Set a listener to be invoked when the list should be refreshed. mPullToRefreshListView = (PullToRefreshListView) findViewById(R.id.pull_to_refresh_listview); mPullToRefreshListView.setOnRefreshListener(new OnRefreshListener<ListView>() { @Override public void onRefresh(PullToRefreshBase<ListView> refreshView) { String label = DateUtils.formatDateTime(getApplicationContext(), System.currentTimeMillis(), DateUtils.FORMAT_SHOW_TIME | DateUtils.FORMAT_SHOW_DATE | DateUtils.FORMAT_ABBREV_ALL); // Update the LastUpdatedLabel refreshView.getLoadingLayoutProxy().setLastUpdatedLabel(label); // Do work to refresh the list here. new GetDataTask().execute(); } }); ListView actualListView = mPullToRefreshListView.getRefreshableView(); mListItems = new LinkedList<String>(); mListItems.addAll(Arrays.asList(mStrings)); mAdapter = new ArrayAdapter<String>(this, android.R.layout.simple_list_item_1, mListItems); actualListView.setAdapter(mAdapter); } private class GetDataTask extends AsyncTask<Void, Void, String[]> { @Override protected String[] doInBackground(Void... params) { // Simulates a background job. try { Thread.sleep(4000); } catch (InterruptedException e) { } return mStrings; } @Override protected void onPostExecute(String[] result) { mListItems.addFirst("Added after refresh..."); mAdapter.notifyDataSetChanged(); // Call onRefreshComplete when the list has been refreshed. mPullToRefreshListView.onRefreshComplete(); super.onPostExecute(result); } } @Override public boolean onCreateOptionsMenu(Menu menu) { // Inflate the menu; this adds items to the action bar if it is present. getMenuInflater().inflate(R.menu.main, menu); return true; } private String[] mStrings = { "John", "Michelle", "Amy", "Kim", "Mary", "David", "Sunny", "James", "Maria", "Michael", "Sarah", "Robert", "Lily", "William", "Jessica", "Paul", "Crystal", "Peter", "Jennifer", "George", "Rachel", "Thomas", "Lisa", "Daniel", "Elizabeth", "Kevin" }; }
实例源代码下载 http://download.csdn.net/detail/hantangsongming/8336075
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