HttpURLConnection 和GSON解析

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//清单文件中的权限

<uses-permission android:name="android.permission.INTERNET"></uses-permission>

//主方法

public class MainActivity extends AppCompatActivity {

private ListView lv1;
private Handler handler=new Handler(){
@Override
public void handleMessage(Message msg) {
super.handleMessage(msg);
if (msg!=null){
String str=msg.obj.toString();
getmessage(str);
}
}

public void getmessage(String str) {
Gson gson=new Gson();
food foOd =gson.fromJson(str,food.class);
ArrayList<food.DataBean> list= (ArrayList<food.DataBean>) foOd.getData();
for (food.DataBean DataBean:list){
List<food.DataBean.CatesBean> cates = DataBean.getCates();
for (food.DataBean.CatesBean CatesBean: cates){

for (int i = 0; i < cates.size(); i++) {
cates.get(i).getCatename();
}
}
}
// for (int i = 0; i < list.size(); i++) {
// Log.e("lcy", "getmessage:%%%%%%%%%%%%%%%%%%% "+list.get(i).getTitle());
// list.get(i).CatesBean
// }
}
};
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
initView();

}

private void initView() {
lv1 = (ListView) findViewById(R.id.lv1);
new Mythread().start();
}
class Mythread extends Thread {
@Override
public void run() {
//获取数据

//URL对象
try {
URL url = new URL("http://app.vmoiver.com/apiv3/post/getPostInCate?cateid=0&p=1");
//通过URL打开网络连接
HttpURLConnection connection = (HttpURLConnection) url.openConnection();
//响应码
if (connection.getResponseCode() == 200) {
//获取数据成功
InputStream is = connection.getInputStream();
//从流中取出数据
byte[] buffer = new byte[1024];
int len = 0;
//水桶
StringBuilder stringBuilder = new StringBuilder();
while ((len = is.read(buffer)) != -1) {
stringBuilder.append(new String(buffer, 0, len));
}
String result = stringBuilder.toString();
Message message=Message.obtain();
message.obj=result;
handler.sendMessage(message);
}

} catch (Exception e) {
e.printStackTrace();
}

}
}
}

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