pull-to-Refresh

package com.zcp.week1;

import java.io.IOException;
import java.util.ArrayList;
import java.util.List;

import org.apache.http.HttpEntity;
import org.apache.http.HttpResponse;
import org.apache.http.client.ClientProtocolException;
import org.apache.http.client.HttpClient;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.impl.client.DefaultHttpClient;
import org.apache.http.util.EntityUtils;

import android.app.Activity;
import android.os.AsyncTask;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.GridView;
import android.widget.Toast;

import com.google.gson.Gson;
import com.handmark.pulltorefresh.library.PullToRefreshBase;
import com.handmark.pulltorefresh.library.PullToRefreshBase.OnRefreshListener2;
import com.handmark.pulltorefresh.library.PullToRefreshGridView;
import com.zcp.bean.Conn;
import com.zcp.bean.Data;

public class MainActivity extends Activity {

private String url="http://m.yunifang.com/yunifang/mobile/goods/getall?random=9949&encole=6c2154232994e7d36ad461e3caa68ca7";
private List<Data> list=new ArrayList<Data>();
private List<Data> list1=new ArrayList<Data>();
private PullToRefreshGridView view_grid;
private GridView grid;
private MyApapter adapter;
private List<Data> d;
private int j=0;
private boolean flag=true;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);

view_grid=(PullToRefreshGridView)findViewById(R.id.pull_refresh_grid);
grid=view_grid.getRefreshableView();
new Ask().execute(url);
view_grid.setOnRefreshListener(new OnRefreshListener2<GridView>() {

@Override
public void onPullDownToRefresh(PullToRefreshBase<GridView> refreshView) {
flag=true;
new Ask().execute(url);

}

@Override
public void onPullUpToRefresh(PullToRefreshBase<GridView> refreshView) {
flag=false;
new Ask().execute(url);
}

});
adapter=new MyApapter(list,MainActivity.this);
grid.setAdapter(adapter);
grid.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {


}
});
}

private class Ask extends AsyncTask<String,Void,String>{

@Override
protected String doInBackground(String... params) {
String s = http(params[0]);
return s;
}

@Override
protected void onPostExecute(String result) {
super.onPostExecute(result);
Gson gson=new Gson();
Conn c=gson.fromJson(result,Conn.class);
d = c.getData();
if(flag){
listTest(d);
}else{
listTest1();
}

adapter.notifyDataSetChanged();
view_grid.onRefreshComplete();
}

}

private String http(String s){
try {
HttpClient client=new DefaultHttpClient();
HttpGet get=new HttpGet(s);
HttpResponse res = client.execute(get);
int i=res.getStatusLine().getStatusCode();
if(i==200){
HttpEntity en = res.getEntity();
String ss=EntityUtils.toString(en,"utf-8");
return ss;
}
} catch (ClientProtocolException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
return null;

};

private void listTest(List<Data> d){
list.clear();
for (int i = 0; i <d.size(); i++) {
if(d.get(i)!=null){
if(i<10){
list.add(d.get(i));
}else{
list1.add(d.get(i));
}
}
}

}
private void listTest1(){

for (int i =j; i <j+5; i++) {
if(i==list1.size()){
Toast.makeText(MainActivity.this,"已经是最后一条了",1).show();
return;
}
if(list1.get(i)!=null){
list.add(list1.get(i));
}
}

j+=5;

}
}

//xml布局

<RelativeLayout 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=".MainActivity" >
<com.handmark.pulltorefresh.library.PullToRefreshGridView
xmlns:ptr="http://schemas.android.com/apk/res-auto"
android:id="@+id/pull_refresh_grid"
android:layout_height="fill_parent"
android:layout_width="fill_parent"
android:numColumns="1"
android:verticalSpacing="1dp"
android:horizontalSpacing="1dp"
android:columnWidth="100dp"
android:stretchMode="columnWidth"
android:gravity="fill"
ptr:ptrMode="both"
ptr:ptrDrawable="@drawable/a" />

</RelativeLayout>