Handler用ListView展示

主页面操作

import android.os.Handler;
import android.os.Message;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.widget.ListView;

import com.google.gson.Gson;

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

public class MainActivity extends AppCompatActivity {
    private String urlString = "http://www.xieast.com/api/news/news.php?page=";
    private ListView listView;
    private List<Bean.DataBean> list = new ArrayList<>();
    private Handler handler = new Handler(){
        @Override
        public void handleMessage(Message msg) {
            super.handleMessage(msg);
            if(msg.what==1){
                String json = (String)msg.obj;
                //获取json
                Gson gson = new Gson();
                Bean bean = gson.fromJson(json, Bean.class);
                List<Bean.DataBean> data = bean.getData();
                list.addAll(data);
                //获取适配器
                adapter = new MyAdapter(list, MainActivity.this);
                listView.setAdapter(adapter);
            }
        }
    };
    private MyAdapter adapter;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        listView = findViewById(R.id.listView);
        newThread();
    }

    private void newThread() {
        new Thread(new Runnable() {
            @Override
            public void run() {
                //创建NetWorkUtils方法
                String netJson = NetWorkUtils.getNetJson(urlString);
                Message message = handler.obtainMessage();
                message.what = 1;
                message.obj = netJson;
                handler.sendMessage(message);
            }
        }).start();
    }
}

创建NetWorkUtils方法

import java.io.BufferedReader;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.net.HttpURLConnection;
import java.net.MalformedURLException;
import java.net.URL;

public class NetWorkUtils {
    public static String getNetJson(String urlString) {
        try {
            //用Url对象分装接口
            URL url = new URL(urlString);
            //打开网络连接
            HttpURLConnection connection = (HttpURLConnection) url.openConnection();
            int responseCode = connection.getResponseCode();
            if(responseCode==200){
                //返回的数据封装在输入流中
                InputStream inputStream = connection.getInputStream();
                BufferedReader bufferedReader = new BufferedReader(new InputStreamReader(inputStream));
                StringBuffer stringBuffer = new StringBuffer();
                String temp;
                while((temp = bufferedReader.readLine())!=null){
                    stringBuffer.append(temp);
                }
                return stringBuffer.toString();
            }
        } catch (Exception e) {
            e.printStackTrace();
        }
        return "";
    }

}

完善适配器