Android 下拉刷新控件 SwipeRefreshLayout
2014-04-25 14:01
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上个月,google发布了自己的下拉刷新控件------SwipeRefreshLayout,该控件封装在android-support-v4.jar包中,依靠监听OnRefreshListener实现刷新操作。该控件用法十分简单,setEnable()方法控制刷新是否可用,setRefreshing()方法控制刷新进度条动画是否可用,由于是要实现下拉刷新,官方文档明确指出该控件所含有的一个直接子View必须是能够滚动的,如ListView、ScrollView等等。
要使用该控件,需要现在布局文件定义SwipeRefreshLayout控件,布局文件如下:
listView 的item布局文件:
主activity代码如下:
Demo下载地址:点击打开链接
要使用该控件,需要现在布局文件定义SwipeRefreshLayout控件,布局文件如下:
<android.support.v4.widget.SwipeRefreshLayout xmlns:android="http://schemas.android.com/apk/res/android" android:id="@+id/swipe" android:layout_width="match_parent" android:layout_height="match_parent" > <ListView android:id="@+id/list" android:layout_width="match_parent" android:layout_height="match_parent" > </ListView> </android.support.v4.widget.SwipeRefreshLayout>
listView 的item布局文件:
<?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="match_parent" > <TextView android:id="@+id/textView1" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_marginTop="10dp" android:layout_marginBottom="10dp" android:textSize="20sp" android:text="TextView" /> </RelativeLayout>
主activity代码如下:
package com.example.android_test_swiperefreshlayout; import java.util.ArrayList; import android.os.Bundle; import android.os.Handler; import android.R.integer; import android.app.Activity; import android.support.v4.widget.SwipeRefreshLayout; import android.support.v4.widget.SwipeRefreshLayout.OnRefreshListener; import android.view.LayoutInflater; import android.view.View; import android.view.ViewGroup; import android.widget.BaseAdapter; import android.widget.ListView; import android.widget.TextView; import android.widget.Toast; public class MainActivity extends Activity implements OnRefreshListener { private SwipeRefreshLayout swipeLayout; private ListView listView; private ArrayList<String> list; private MyAdapter adapter; private int count = 0; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); initData(); swipeLayout = (SwipeRefreshLayout) findViewById(R.id.swipe); swipeLayout.setColorScheme(android.R.color.holo_blue_bright, android.R.color.holo_green_light, android.R.color.holo_orange_light, android.R.color.holo_red_light); listView = (ListView) findViewById(R.id.list); adapter = new MyAdapter(); listView.setAdapter(adapter); swipeLayout.setOnRefreshListener(this); } public void initData() { list = new ArrayList<String>(); for (int i = 0; i < 24; i++) { list.add("北京" + i); } count = 24; } class MyAdapter extends BaseAdapter { @Override public int getCount() { // TODO Auto-generated method stub return list.size(); } @Override public Object getItem(int position) { // TODO Auto-generated method stub return list.get(position); } @Override public long getItemId(int position) { // TODO Auto-generated method stub return position; } @Override public View getView(int position, View convertView, ViewGroup parent) { // TODO Auto-generated method stub if (convertView == null) { convertView = LayoutInflater.from(getApplicationContext()).inflate(R.layout.item, null); } TextView textView = (TextView) convertView.findViewById(R.id.textView1); textView.setText(list.get(position)); return convertView; } } @Override public void onRefresh() { // TODO Auto-generated method stub new Handler().postDelayed(new Runnable() { @Override public void run() { // TODO Auto-generated method stub swipeLayout.setRefreshing(true); list.add("新增北京"+count); count++; adapter.notifyDataSetChanged(); } }, 3000); } }
Demo下载地址:点击打开链接
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