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

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;
}
}