android下拉刷新控件之第三方开源控件的使用实现

本次使用的第三方下拉刷新控件是：Android-Pull-Refresh，下载地址：https://github.com/chrisbanes/Android-PullToRefresh

该控件适用于:

• ViewPager

• HorizontalScrollView

• ScrollView

• WebView

• GridView

• ListView

• ExpandableListView
• ListFragment
  

从github上下载解压后，将library,PullToRefreshListFragment,PullToRefreshViewPager导入项目后，右键自己新建的项目，选择Properties。进入例如以下图的页面后点击Add加入就可以：

加入好后就可以開始编写Demo，详细代码例如以下：

<?
xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:orientation="vertical" >

    <!-- The PullToRefreshListView replaces a standard ListView widget. -->

    <com.handmark.pulltorefresh.library.PullToRefreshListView
        xmlns:ptr="http://schemas.android.com/apk/res-auto"
        android:id="@+id/pull_refresh_list"
        android:layout_width="fill_parent"
        android:layout_height="fill_parent"
        android:cacheColorHint="#00000000"
        android:divider="#19000000"
        android:dividerHeight="4dp"
        android:fadingEdge="none"
        android:fastScrollEnabled="false"
        android:footerDividersEnabled="false"
        android:headerDividersEnabled="false"
        android:smoothScrollbar="true"
        ptr:ptrDrawable="@drawable/ic_launcher"
        ptr:ptrMode="both" />

</LinearLayout>

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

import android.app.Activity;
import android.os.AsyncTask;
import android.os.Bundle;
import android.widget.ArrayAdapter;
import android.widget.ListView;
import android.widget.Toast;

import com.handmark.pulltorefresh.library.PullToRefreshBase;
import com.handmark.pulltorefresh.library.PullToRefreshBase.OnLastItemVisibleListener;
import com.handmark.pulltorefresh.library.PullToRefreshBase.OnRefreshListener;
import com.handmark.pulltorefresh.library.PullToRefreshListView;

/**
 * MainActivity---利用第三方下拉刷新控件实现
 * @author seabear
 *
 */
public class MainActivity extends Activity {

	private PullToRefreshListView mPullToRefreshListView;
	private List<String> mArrayList = new ArrayList<String>();
	private ArrayAdapter<String> mArrayAdapter;
	private int mNums = 0;
	
	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.activity_main);
		
		mPullToRefreshListView = (PullToRefreshListView)this.findViewById(R.id.pull_refresh_list);
		mArrayAdapter = new ArrayAdapter<>(this, android.R.layout.simple_list_item_1, mArrayList);
		mPullToRefreshListView.setAdapter(mArrayAdapter);
		
		mPullToRefreshListView.setOnRefreshListener(new OnRefreshListener<ListView>() {

			@Override
			public void onRefresh(PullToRefreshBase<ListView> refreshView) {
				// TODO Auto-generated method stub
				new GetDataTask().execute();
			}
			
		});
		
		
	}
	private class GetDataTask extends AsyncTask<Void, Void, String>
	{

		@Override
		protected String doInBackground(Void... params) {
			// Simulates a background job.
			mNums++;
			try {
				Thread.sleep(2000);
			} catch (InterruptedException e) {
			}
			return "第" + String.valueOf(mNums) + "行";
		}

		@Override
		protected void onPostExecute(String result) {
			
			mArrayList.add(result);
			
			mArrayAdapter.notifyDataSetChanged();

			// Call onRefreshComplete when the list has been refreshed.
			mPullToRefreshListView.onRefreshComplete();

			super.onPostExecute(result);
		}
		
	}
}