HttpUrlConnection+Handler 和 HttpClient+AsyncTask 实现页面的基本操作

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package com.example.myzhoukao_one.Activity;import android.os.AsyncTask;import android.os.Handler;import android.os.Message;import android.support.v7.app.AppCompatActivity;import android.os.Bundle;import android.util.Log;import android.widget.ListView;import android.widget.TextView;import com.example.myzhoukao_one.R;import com.google.gson.Gson;import com.google.gson.reflect.TypeToken;import org.apache.http.HttpResponse;import org.apache.http.client.HttpClient;import org.apache.http.client.methods.HttpGet;import org.apache.http.conn.ssl.AllowAllHostnameVerifier;import org.apache.http.conn.ssl.SSLSocketFactory;import org.apache.http.impl.client.DefaultHttpClient;import org.json.JSONArray;import org.json.JSONException;import java.io.BufferedReader;import java.io.InputStream;import java.io.InputStreamReader;import java.lang.reflect.Type;import java.net.HttpURLConnection;import java.net.URL;import java.util.ArrayList;import java.util.List;public class MainActivity extends AppCompatActivity {    private TextView textView;    private ListView listView;    private int index = 0;    private List<String> list = new ArrayList<>();    private Handler handler = new Handler(){        @Override        public void handleMessage(Message msg) {            if(msg.what == 0){               String json = (String) msg.obj;                Log.i("---",json);                Gson gson = new Gson();                Type type = new TypeToken<List<String>>() {}.getType();                List<String> jsonList = gson.fromJson(json,type);                Log.i("----",jsonList.size()+"长度");                try {                    JSONArray jsonArray = new JSONArray(json);                    for (int i=0; i<jsonArray.length();i++){                        String string = jsonArray.getString(i);                        list.add(string);                    }                    textView.setText(list.get(index));                    handler.sendEmptyMessageDelayed(1,3000);              } catch (JSONException e) {                    e.printStackTrace();                }            }else if( msg.what == 1){                index ++;                index = index%list.size();                textView.setText(list.get(index));                handler.sendEmptyMessageDelayed(1,3000);            }        }    };    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        textView = (TextView) findViewById(R.id.text_tou);        listView = (ListView) findViewById(R.id.list_view);        getTouTiao();        getListViewData();    }    private void getListViewData() {        AsyncTask<Void,Void,String> asyncTask = new AsyncTask<Void, Void, String>() {            @Override            protected String doInBackground(Void... voids) {                try {                    SSLSocketFactory.getSocketFactory().setHostnameVerifier(new AllowAllHostnameVerifier());                    HttpClient client = new DefaultHttpClient();                    HttpGet httpGet = new HttpGet("https://api.tianapi.com/wxnew/?key=8d6e3228d25298f13af4fc40ce6c9679&num=10&page=1");                    HttpResponse httpResponse = client.execute(httpGet);                    int statusCode = httpResponse.getStatusLine().getStatusCode();                    if (statusCode == 200){                        InputStream inputStream = httpResponse.getEntity().getContent();                        String json = streamToString(inputStream,"utf-8");                        return json;                    }                } catch (Exception e) {                    e.printStackTrace();                }                return null;            }            @Override            protected void onPostExecute(String s) {                Gson gson = new Gson();                DataDataBean dataDataBean = gson.fromJson(s, DataDataBean.class);                List<DataDataBean.NewslistBean> newslist = dataDataBean.getNewslist();                //设置适配器                MyAdapter myAdapter = new MyAdapter(newslist, MainActivity.this);                listView.setAdapter(myAdapter);            }        };        asyncTask.execute();    }    private void getTouTiao(){         new Thread(){             @Override             public void run(){                 try {                     URL url = new URL("http://www.toutiao.com/hot_words/");                     HttpURLConnection connection = (HttpURLConnection) url.openConnection();                     connection.setRequestMethod("GET");                     connection.setReadTimeout(5000);                     connection.setConnectTimeout(5000);                     int responseCode = connection.getResponseCode();                     if(responseCode == 200){                         InputStream inputStream = connection.getInputStream();                         String json = streamToString(inputStream,"utf-8");                         Message message = Message.obtain();                         message.what = 0;                         message.obj = json;                         handler.sendMessage(message);                     }                 } catch (Exception e) {                     e.printStackTrace();                 }             }         }.start();    }    private String streamToString(InputStream inputstream,String charset){        try {            InputStreamReader inputStreamReader = new InputStreamReader(inputstream,charset);            BufferedReader bufferedreader = new BufferedReader(inputStreamReader);            String s;            StringBuilder builder = new StringBuilder();            while((s=bufferedreader.readLine())!=null){                   builder.append(s);            }            bufferedreader.close();            return builder.toString();        } catch (Exception e) {            e.printStackTrace();        }        return null;    }}
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