android网络实验

在MainActivity中
package com.example.administrator.myapplication;

import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.webkit.WebView;
import android.webkit.WebViewClient;
import android.widget.Button;
import android.widget.TextView;

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

public class MainActivity extends AppCompatActivity implements View.OnClickListener {

TextView responseText;

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);

Button sendRequest = (Button)findViewById(R.id.send_request);
responseText = (TextView)findViewById(R.id.response_text);
sendRequest.setOnClickListener(this);

}

public void onClick(View v){
if(v.getId()  == R.id.send_request){
sendRequestWithHttpURLConnection();
}
}

private void sendRequestWithHttpURLConnection(){
new Thread(new Runnable() {
@Override
public void run() {
HttpURLConnection connection = null;
BufferedReader reader = null;
try{
URL url = new URL("https://www.baidu.com");
connection = (HttpURLConnection)url.openConnection();
connection.setRequestMethod("GET");
connection.setConnectTimeout(80000);
connection.setReadTimeout(80000);
InputStream in = connection.getInputStream();
reader = new BufferedReader(new InputStreamReader(in));
StringBuilder response = new StringBuilder();
String line;
while ((line = reader.readLine()) != null){
response.append(line);
}
showResponse(response.toString());
}catch (Exception e){
e.printStackTrace();
}finally {
if(reader != null){
try{
reader.close();
}catch (IOException e){
e.printStackTrace();
}
}
if(connection != null){
connection.disconnect();
}
}
}
}).start();
}

private void showResponse(final String response){
runOnUiThread(new Runnable() {
@Override
public void run() {
responseText.setText(response);
}
});
}

}

在activity_main中

<?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.ConstraintLayout
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context="com.example.administrator.myapplication.MainActivity">

<LinearLayout
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:orientation="vertical">

<Button
android:id="@+id/send_request"
android:text="Send Request"
android:layout_width="match_parent"
android:layout_height="wrap_content" />

<ScrollView
android:layout_width="match_parent"
android:layout_height="match_parent">
<TextView
android:id="@+id/response_text"
android:layout_width="match_parent"
android:layout_height="wrap_content" />
</ScrollView>

</LinearLayout>
</android.support.constraint.ConstraintLayout>