android SwipeRefreshLayout下拉刷新实现

hello，大家好，首先祝各位程序猿新年快乐，今天研究了一下android 的下拉刷新功能，发现很多的博客都是使用在头部添加一个head.xml文件来实现的，这样的做法相对来说还是比较复杂的，网上搜索了相关的资料后发现Google自己的android-support-v4.jar包中有一个自带的组件SwipeRefreshLayout，于是在前人的基础上做了一些修改，写了个Demo，效果还是很不错的。

感谢原文作者：http://www.stormzhang.com/android/2014/03/29/android-swiperefreshlayout/

API doc：http://developer.android.com/reference/android/support/v4/widget/SwipeRefreshLayout.html

效果如下：

使用方法如下：

activity_main.xml：
<?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" >


    <android.support.v4.widget.SwipeRefreshLayout
        android:id="@+id/id_swipe_ly"
        android:layout_width="match_parent"
        android:layout_height="match_parent" >


        <LinearLayout
            android:orientation="vertical"
            android:layout_width="match_parent"
            android:layout_height="match_parent" >


            <ProgressBar 
                android:id="@+id/id_progressbar"
                android:layout_width="wrap_content"
                android:layout_gravity="center"
                android:layout_height="wrap_content"
                android:visibility="gone"/>
            
            <TextView 
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:text="我所学过的语言："
                android:textSize="20sp"/>
            


            <ListView
                android:id="@+id/id_listview"
                android:layout_width="match_parent"
                android:layout_height="match_parent" >
            </ListView>
            
        </LinearLayout>
    </android.support.v4.widget.SwipeRefreshLayout>


</RelativeLayout>

MainActivity.class：

package com.amos.app.ui;


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


import android.annotation.SuppressLint;
import android.app.Activity;
import android.os.Bundle;
import android.os.Handler;
import android.support.v4.widget.SwipeRefreshLayout;
import android.view.View;
import android.widget.ArrayAdapter;
import android.widget.ListView;
import android.widget.ProgressBar;
import android.widget.Toast;


import com.example.pulltorefreshdemo.R;


public class MainActivity extends Activity implements
SwipeRefreshLayout.OnRefreshListener {


private static final int REFRESH_COMPLETE = 0X110;
private SwipeRefreshLayout mSwipeRefreshLayout;
private ListView mListView;
private ProgressBar mProgressBar;
private ArrayAdapter<String> mAdapter;
private List<String> mDatas = new ArrayList<String>(Arrays.asList("java",
"js", "android", "ios", "c++", "json"));


private Handler mHandler = new Handler() {
public void handleMessage(android.os.Message msg) {
switch (msg.what) {
case REFRESH_COMPLETE:
mDatas.addAll(Arrays.asList("html", "css", "jquery mobile"));
mAdapter.notifyDataSetChanged();
mSwipeRefreshLayout.setRefreshing(false);
//这里不能直接用Toast，通过showInfo函数调用toast
showInfo("刷新成功!");
mProgressBar.setVisibility(View.GONE);
break;


default:
break;
}
}
};


@SuppressLint("InlinedApi")
@SuppressWarnings("deprecation")
@Override
protected void onCreate(Bundle savedInstanceState) {
// TODO Auto-generated method stub
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
mProgressBar=(ProgressBar) findViewById(R.id.id_progressbar);
mListView = (ListView) findViewById(R.id.id_listview);
mSwipeRefreshLayout = (SwipeRefreshLayout) findViewById(R.id.id_swipe_ly);
mSwipeRefreshLayout.setColorSchemeResources(android.R.color.holo_blue_bright, android.R.color.holo_green_light,  
                android.R.color.holo_orange_light, android.R.color.holo_red_light);
mSwipeRefreshLayout.setOnRefreshListener(this);
mAdapter = new ArrayAdapter<String>(this,
android.R.layout.simple_list_item_1, mDatas);
mListView.setAdapter(mAdapter);
}


@Override
//下拉时所执行的操作，刷新了2S
public void onRefresh() {
// TODO Auto-generated method stub
mProgressBar.setVisibility(View.VISIBLE);
mHandler.sendEmptyMessageDelayed(REFRESH_COMPLETE, 2000);
}

private void showInfo(String info){
Toast.makeText(this, info, Toast.LENGTH_SHORT).show();
}


}

Demo下载地址：http://pan.baidu.com/s/1c0EmjlQ

希望大家会喜欢。