android 界面刷新功能

  activity_main.xml
1 <android.support.v4.widget.SwipeRefreshLayout
        android:id="@+id/sr1"
        android:layout_width="match_parent"
        android:layout_height="match_parent">
        <ListView
            android:id="@+id/lv"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"/>
    </android.support.v4.widget.SwipeRefreshLayout>

　　MainActivity.java
 1 package com.example.add;

import android.os.Handler;
import android.support.v4.widget.SwipeRefreshLayout;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.widget.ArrayAdapter;
import android.widget.ListView;

import java.util.ArrayList;
import java.util.List;

public class MainActivity extends AppCompatActivity implements SwipeRefreshLayout.OnRefreshListener {
    private SwipeRefreshLayout swipeRefreshLayout;
    private ListView listView;
    private List<String> list;
    private ArrayAdapter adapter;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        swipeRefreshLayout = (SwipeRefreshLayout) findViewById(R.id.sr1);
        swipeRefreshLayout.setOnRefreshListener(this);
        list = new ArrayList<>();
        list.add("ssss");
        listView = (ListView) findViewById(R.id.lv);
        adapter = new ArrayAdapter(this
                , android.R.layout.simple_list_item_1
                , android.R.id.text1
                , list);
        listView.setAdapter(adapter);
    }

    @Override
    public void onRefresh() {
        new Handler().postDelayed(new Runnable() {
            @Override
            public void run() {
                swipeRefreshLayout.setRefreshing(false);
                adapter.clear();
                list.add("1111");
                adapter.notifyDataSetChanged();
            }
        },1000);
    }
}