android 界面刷新功能

  activity_main.xml
1 <android.support.v4.widget.SwipeRefreshLayout
2         android:id="@+id/sr1"
3         android:layout_width="match_parent"
4         android:layout_height="match_parent">
5         <ListView
6             android:id="@+id/lv"
7             android:layout_width="match_parent"
8             android:layout_height="wrap_content"/>
9     </android.support.v4.widget.SwipeRefreshLayout>

　　MainActivity.java
 1 package com.example.add;
 2 
 3 import android.os.Handler;
 4 import android.support.v4.widget.SwipeRefreshLayout;
 5 import android.support.v7.app.AppCompatActivity;
 6 import android.os.Bundle;
 7 import android.widget.ArrayAdapter;
 8 import android.widget.ListView;
 9 
10 import java.util.ArrayList;
11 import java.util.List;
12 
13 public class MainActivity extends AppCompatActivity implements SwipeRefreshLayout.OnRefreshListener {
14     private SwipeRefreshLayout swipeRefreshLayout;
15     private ListView listView;
16     private List<String> list;
17     private ArrayAdapter adapter;
18 
19     @Override
20     protected void onCreate(Bundle savedInstanceState) {
21         super.onCreate(savedInstanceState);
22         setContentView(R.layout.activity_main);
23         swipeRefreshLayout = (SwipeRefreshLayout) findViewById(R.id.sr1);
24         swipeRefreshLayout.setOnRefreshListener(this);
25         list = new ArrayList<>();
26         list.add("ssss");
27         listView = (ListView) findViewById(R.id.lv);
28         adapter = new ArrayAdapter(this
29                 , android.R.layout.simple_list_item_1
30                 , android.R.id.text1
31                 , list);
32         listView.setAdapter(adapter);
33     }
34 
35     @Override
36     public void onRefresh() {
37         new Handler().postDelayed(new Runnable() {
38             @Override
39             public void run() {
40                 swipeRefreshLayout.setRefreshing(false);
41                 adapter.clear();
42                 list.add("1111");
43                 adapter.notifyDataSetChanged();
44             }
45         },1000);
46     }
47 }