Android SwipeRefreshLayout

首先介绍一下 SwipeRefreshLayout ,由于下拉刷新使用的人比较多,于是谷歌自己就做了一个下拉刷新的控件.

android.support.v4.widget.SwipeRefreshLayout

 

 

具体是使用方法:

//XML
<LinearLayout 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="com.example.swiperefresh.MainActivity" >

    <android.support.v4.widget.SwipeRefreshLayout
        android:id="@+id/srl"
        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" >
        </ListView>
    </android.support.v4.widget.SwipeRefreshLayout>

</LinearLayout>

//Activity
package com.example.swiperefresh;

import java.util.ArrayList;

import android.app.Activity;
import android.os.AsyncTask;
import android.os.Bundle;
import android.support.v4.widget.SwipeRefreshLayout;
import android.support.v4.widget.SwipeRefreshLayout.OnRefreshListener;
import android.widget.ArrayAdapter;
import android.widget.ListView;

public class MainActivity extends Activity {

    private ListView lv;
    private SwipeRefreshLayout srl;
    private ArrayAdapter<String> adapter;
    private ArrayList<String> date;
    private int count = 0;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        date = new ArrayList<String>();
        initUI();

    }

    private void initUI() {
        lv = (ListView) findViewById(R.id.lv);
        srl = (SwipeRefreshLayout) findViewById(R.id.srl);
        srl.setColorSchemeResources(android.R.color.holo_blue_light, android.R.color.holo_red_light, android.R.color.holo_orange_light, android.R.color.holo_green_light);
        srl.setOnRefreshListener(new OnRefreshListener() {

            @SuppressWarnings("unchecked")
            @Override
            public void onRefresh() {
                new listAsyncTask().execute();
            }
        });
        adapter = new ArrayAdapter<>(this, android.R.layout.simple_list_item_1,
                date);
        lv.setAdapter(adapter);
    }

    public class listAsyncTask extends AsyncTask {

        @Override
        protected void onPreExecute() {
            // TODO Auto-generated method stub
            super.onPreExecute();
            srl.setRefreshing(true);
        }

        @Override
        protected Object doInBackground(Object... params) {
            // TODO Auto-generated method stub
            return count++;
        }

        @Override
        protected void onPostExecute(Object result) {
            // TODO Auto-generated method stub
            super.onPostExecute(result);
            date.add(0, "" + result);
            adapter.notifyDataSetChanged();
            srl.setRefreshing(false);
        }
    }

}