读取网上gson数据，展示到gridview上，然后上拉加载，下拉刷新
NetWorkUtil.class
package com.example.liangminghui20160425; import java.io.IOException; 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.params.BasicHttpParams; import org.apache.http.params.HttpConnectionParams; import org.apache.http.params.HttpParams; import org.apache.http.util.EntityUtils; public class NetWorkUtil { public static String loginCheck_Get_HttpClient(String url) { // TODO Auto-generated method stub String result = ""; HttpGet get = new HttpGet(url);//创建httpClient的get请求对象 //设置请求参数 HttpParams params = new BasicHttpParams(); HttpConnectionParams.setConnectionTimeout(params, 5*1000); HttpConnectionParams.setSoTimeout(params, 5*1000); HttpClient client = new DefaultHttpClient(params);//创建HttpClient对象 try { HttpResponse res = client.execute(get);//执行请求，获得结果 if(res.getStatusLine().getStatusCode() == 200){ HttpEntity entity = res.getEntity();//获得相应结果，是一个HttpEntity对象 result = EntityUtils.toString(entity, "utf-8");//转换为字符串 } } catch (ClientProtocolException e) { // TODO Auto-generated catch block e.printStackTrace(); } catch (IOException e) { // TODO Auto-generated catch block e.printStackTrace(); } return result; } }
MainActivity.class:
package com.example.liangminghui20160425; import java.util.ArrayList; import java.util.List; import android.app.Activity; import android.os.AsyncTask; import android.os.Bundle; import android.text.format.DateUtils; import android.util.Log; import android.widget.BaseAdapter; import android.widget.GridView; import com.example.adapter.Mybase; import com.example.vo.Data; import com.example.vo.Demo; import com.google.gson.Gson; import com.handmark.pulltorefresh.library.PullToRefreshBase; import com.handmark.pulltorefresh.library.PullToRefreshBase.OnRefreshListener2; import com.handmark.pulltorefresh.library.PullToRefreshGridView; //主页面 public class MainActivity extends Activity { private PullToRefreshGridView mPullRefreshListView; // 网址 private String URL="http://apis.juhe.cn/goodbook/query?key=9d6ef8c31647a206e05fcaff70527182&catalog_id=246&rn=20&pn="; // private String URL = "http://apis.juhe.cn/goodbook/query?key=9d6ef8c31647a206e05fcaff70527182&catalog_id=246&rn=10&rn=10"; private Mybase adapter; //设置初始值 int z = 10; int p = 10; private List<Data> list; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); // 找控件 mPullRefreshListView = (PullToRefreshGridView) findViewById(R.id.pull_refresh_grid); // 刚进入初次加载 new GetDataTask().execute(URL + z); // 监听 mPullRefreshListView .setOnRefreshListener(new OnRefreshListener2<GridView>() { // 下拉刷新加载 @Override public void onPullDownToRefresh( PullToRefreshBase<GridView> refreshView) { Log.e("TAG", "onPullDownToRefresh"); // Do work to // 刷新时间 String label = DateUtils.formatDateTime( getApplicationContext(), System.currentTimeMillis(), DateUtils.FORMAT_SHOW_TIME | DateUtils.FORMAT_SHOW_DATE | DateUtils.FORMAT_ABBREV_ALL); // Update the LastUpdatedLabel refreshView.getLoadingLayoutProxy() .setLastUpdatedLabel(label); // 页数 z = z - 1; // AsyncTask异步交互加载数据 new GetDataTask().execute(URL + z); } // 上拉加载跟多 @Override public void onPullUpToRefresh( PullToRefreshBase<GridView> refreshView) { Log.e("TAG", "onPullUpToRefresh"); // Do work to refresh // 页数 p = p + 1; // AsyncTask异步交互加载数据 new GetDataTask2().execute(URL + p); } }); } // 下拉刷新加载数据 private class GetDataTask extends AsyncTask<String, Integer, String> { private String s; @Override protected String doInBackground(String... params) { String url = params[0]; // 请求数据 s = NetWorkUtil.loginCheck_Get_HttpClient(url); return s; } protected void onPostExecute(String result) { // 解析 Gson gson = new Gson(); Demo demo = gson.fromJson(result, Demo.class); List<Data> data =demo.getResult().getData(); list = data; // 适配 adapter = new Mybase(list, getApplicationContext()); mPullRefreshListView.setAdapter(adapter); // 刷新适配器 adapter.notifyDataSetChanged(); // 关闭刷新下拉 mPullRefreshListView.onRefreshComplete(); } } // 上拉加载更多 private class GetDataTask2 extends AsyncTask<String, Integer, String> { private String s; @Override protected String doInBackground(String... params) { String url = params[0]; // 请求数据 s = NetWorkUtil.loginCheck_Get_HttpClient(url); return s; } @Override protected void onPostExecute(String result) { // 解析 Gson gson = new Gson(); Demo demo = gson.fromJson(result, Demo.class); List<Data> data =demo.getResult().getData(); list.addAll(data); // 刷新适配器 adapter.notifyDataSetChanged(); // Call onRefreshComplete when the list has been refreshed. // 关闭上拉加载 mPullRefreshListView.onRefreshComplete(); } } }
Mybase.class
package com.example.adapter; import java.util.List; import com.example.liangminghui20160425.R; import com.example.vo.Data; import com.loopj.android.image.SmartImageView; import com.nostra13.universalimageloader.core.ImageLoader; import android.content.Context; import android.view.LayoutInflater; import android.view.View; import android.view.ViewGroup; import android.webkit.WebView.FindListener; import android.widget.BaseAdapter; import android.widget.ImageView; import android.widget.TextView; public class Mybase extends BaseAdapter{ private List<Data> data; private Context context; public Mybase(List<Data> data, Context context) { super(); this.data = data; this.context = context; } @Override public int getCount() { // TODO Auto-generated method stub return data.size(); } @Override public Object getItem(int position) { // TODO Auto-generated method stub return data.get(position); } @Override public long getItemId(int position) { // TODO Auto-generated method stub return position; } @Override public View getView(int position, View convertView, ViewGroup parent) { // TODO Auto-generated method stub Viehoder vh; if(convertView==null){ vh=new Viehoder(); convertView=LayoutInflater.from(context).inflate(R.layout.item, null); vh.image_view=(SmartImageView) convertView.findViewById(R.id.image_view); vh.text_view=(TextView) convertView.findViewById(R.id.text_view); vh.text_count=(TextView) convertView.findViewById(R.id.text_count); vh.text_time=(TextView) convertView.findViewById(R.id.text_time); convertView.setTag(vh); }else{ vh=(Viehoder) convertView.getTag(); } vh.text_view.setText(data.get(position).getTitle()); vh.image_view.setImageUrl(data.get(position).getImg()); vh.text_time.setText(data.get(position).getBytime()); vh.text_count.setText(data.get(position).getReading()); return convertView; } class Viehoder{ SmartImageView image_view; TextView text_view,text_time,text_count; } }
activity.xml:
<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_width="match_parent" android:layout_height="match_parent" android:numColumns="2" ptr:ptrDrawable="@drawable/ic_launcher" ptr:ptrMode="both" /> </RelativeLayout>
item.xml:
<?xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="match_parent" android:layout_height="match_parent" android:orientation="vertical" > <com.loopj.android.image.SmartImageView android:id="@+id/image_view" android:layout_width="wrap_content" android:layout_height="wrap_content" android:src="@drawable/ic_launcher" /> <TextView android:id="@+id/text_view" android:layout_width="wrap_content" android:layout_height="wrap_content" /> <LinearLayout android:layout_width="wrap_content" android:layout_height="wrap_content" android:orientation="vertical" > <TextView android:id="@+id/text_time" android:layout_width="wrap_content" android:layout_height="wrap_content" /> <TextView android:id="@+id/text_count" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_marginRight="20dp" /> </LinearLayout> </LinearLayout>
总结：这是项目二的第三次周考题，主要考察的是gridview的上拉加载，下拉刷新，通过集成libary类，获得其自定义的PullToRefreshGridView，然后通过以下方法设置，
