package com.example.day02_http_listview01;
import android.annotation.SuppressLint;
import android.os.Handler;
import android.os.Message;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.widget.ListView;
import android.widget.Toast;
import com.google.gson.Gson;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.net.HttpURLConnection;
import java.net.MalformedURLException;
import java.net.URL;
import java.net.URLConnection;
import java.util.List;
public class MainActivity extends AppCompatActivity {
private ListView listView;
private final int UPDATE_UI = 1;
@SuppressLint("HandlerLeak")
private Handler handler = new Handler(){
@Override
public void handleMessage(Message msg) {
switch (msg.what){
case UPDATE_UI:
List<ContentResponseBean.DataBean> datas = (List<ContentResponseBean.DataBean>) msg.obj;
mAdaper.setmDatas(datas);
break;
}
}
};
private ContentAdaper mAdaper;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
//获取资源id
listView = findViewById(R.id.lv_view);
mAdaper = new ContentAdaper(this);
listView.setAdapter(mAdaper);
if(!NetWork.hasNetWork(MainActivity.this)){
Toast.makeText(MainActivity.this,"当前网络不可用",Toast.LENGTH_SHORT).show();
}
new Thread(new Runnable() {
@Override
public void run() {
requestData();
}
}).start();
}
private String urlSrt = "http://apis.juhe.cn/cook/query?key=b0d2db4c246d037654adb1d5080ea06d&menu=%E8%A5%BF%E7%BA%A2%E6%9F%BF&rn=10&pn=3";
private void requestData() {
try {
//定义url地址
URL url = new URL(urlSrt);
//打开连接
HttpURLConnection urlConnection = (HttpURLConnection) url.openConnection();
//设置请求类型
urlConnection.setRequestMethod("GET");
//设置超时
urlConnection.setReadTimeout(5000);
urlConnection.setReadTimeout(5000);
//得到请求值
int responseCode = urlConnection.getResponseCode();
if(responseCode == 200){
String json = strim2String(urlConnection.getInputStream());
//得到gson
Gson gson = new Gson();
ContentResponseBean contentResponseBean = gson.fromJson(json, ContentResponseBean.class);
handler.sendMessage(handler.obtainMessage(UPDATE_UI,contentResponseBean.getResult().getData()));
}
} catch (Exception e) {
e.printStackTrace();
}
}
private String strim2String(InputStream is) throws IOException {
InputStreamReader isr = new InputStreamReader(is);
BufferedReader br = new BufferedReader(isr);
StringBuilder builder = new StringBuilder();
for (String tem = br.readLine();tem!=null;tem = br.readLine()){
builder.append(tem);
}
return builder.toString();
}
}
package com.example.day02_http_listview01;
import java.util.List;
public class ContentResponseBean {
public Result result;
public Result getResult() {
return result;
}
public void setResult(Result result) {
this.result = result;
}
public class Result{
public List<DataBean> data;
public List<DataBean> getData() {
return data;
}
public void setData(List<DataBean> data) {
this.data = data;
}
}
public class DataBean{
public String id;
public String title;
public String getId() {
return id;
}
public void setId(String id) {
this.id = id;
}
public String getTitle() {
return title;
}
public void setTitle(String title) {
this.title = title;
}
}
}
package com.example.day02_http_listview01;
import android.content.Context;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.ImageView;
import android.widget.TextView;
import android.widget.VideoView;
import java.util.ArrayList;
import java.util.List;
public class ContentAdaper extends BaseAdapter {
private List<ContentResponseBean.DataBean> mDatas;
private Context mContext;
public ContentAdaper(Context mContext) {
this.mContext = mContext;
//出始化
mDatas = new ArrayList<>();
}
public void setmDatas(List<ContentResponseBean.DataBean> mDatas){
this.mDatas = mDatas;
notifyDataSetChanged();
}
@Override
public int getCount() {
return mDatas.size();
}
@Override
public ContentResponseBean.DataBean getItem(int position) {
return mDatas.get(position);
}
@Override
public long getItemId(int position) {
return position;
}
@Override
public View getView(int position, View convertView, ViewGroup parent) {
ViewHolder holder;
if(convertView == null){
convertView = LayoutInflater.from(mContext).inflate(R.layout.item,parent,false);
holder = new ViewHolder();
holder.mImage = convertView.findViewById(R.id.image);
holder.mText = convertView.findViewById(R.id.text);
convertView.setTag(holder);
}else{
holder = (ViewHolder) convertView.getTag();
}
holder.mText.setText(getItem(position).getTitle());
return convertView;
}
//创建寄存器
class ViewHolder{
private ImageView mImage;
private TextView mText;
}
}