<?xml version="1.0" encoding="utf-8"?><RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:tools="http://schemas.android.com/tools" android:id="@+id/activity_net" android:layout_width="match_parent" android:layout_height="match_parent" android:orientation="vertical" tools:context="com.example.waterlamp.NetActivity"> <Button  android:id="@+id/okhttp"  android:text="okhttp請求"  android:layout_width="150dp"  android:layout_height="37dp"  android:layout_alignBottom="@+id/http"  android:layout_alignParentEnd="true"  android:layout_alignParentTop="true" /> <Button  android:id="@+id/http"  android:text="HTTP請求"  android:layout_width="wrap_content"  android:layout_height="wrap_content"  android:layout_alignParentTop="true"  android:layout_alignParentStart="true" /> <ScrollView android:layout_width="match_parent" android:layout_height="match_parent" android:layout_alignParentStart="true" android:layout_below="@+id/okhttp" android:layout_alignParentBottom="true" android:layout_alignParentEnd="true" >  <TextView   android:id="@+id/stringData"   android:layout_width="match_parent"   android:layout_height="match_parent" /> </ScrollView></RelativeLayout>

public class NetActivity extends AppCompatActivity implements View.OnClickListener{private Button http,okhttp; private TextView stringData; private String web="https://www.baidu.com"; @Override protected void onCreate(Bundle savedInstanceState) {  super.onCreate(savedInstanceState);  setContentView(R.layout.activity_net);  http= (Button) findViewById(R.id.http);  okhttp= (Button) findViewById(R.id.okhttp);  stringData= (TextView) findViewById(R.id.stringData);  http.setOnClickListener(this);  okhttp.setOnClickListener(this); } @Override public void onClick(View v) {  switch (v.getId()){   case R.id.http:    sendRequestWithHttpURLConnection();   break;   case R.id.okhttp:    sendRequestWithokHttp();   break;  } } private void sendRequestWithHttpURLConnection(){  new Thread(new Runnable() {   @Override   public void run() {    HttpURLConnection connection=null;    BufferedReader reader=null;    try {     URL url=new URL(web);     connection= (HttpURLConnection) url.openConnection();     connection.setRequestMethod("GET");     connection.setConnectTimeout(5000);     connection.setReadTimeout(5000);     InputStream in=connection.getInputStream();     reader=new BufferedReader(new InputStreamReader(in));     StringBuffer response=new StringBuffer();     String line;     while ((line=reader.readLine())!=null){      response.append(line);     }     showRespond(response.toString());    } catch (MalformedURLException e) {     e.printStackTrace();    } catch (IOException e) {     e.printStackTrace();    }finally {     if (reader!=null){      try {       reader.close();      } catch (IOException e) {       e.printStackTrace();      }     }    }   }  }).start(); } private void showRespond(final String response) {  runOnUiThread(new Runnable() {   @Override   public void run() {    stringData.setText(response);   }  }); } private void sendRequestWithokHttp(){  new Thread(new Runnable() {   @Override   public void run() {    try {     OkHttpClient client=new OkHttpClient();     Request request=new Request.Builder()       .url(web).build();     Response response=client.newCall(request).execute();     String str=response.body().string();     showRespond(str);    } catch (IOException e) {     e.printStackTrace();    }   }  }).start(); }}

dependencies { compile fileTree(dir: 'libs', include: ['*.jar']) androidTestCompile('com.android.support.test.espresso:espresso-core:2.2.2', {  exclude group: 'com.android.support', module: 'support-annotations' }) compile 'com.android.support:appcompat-v7:24.2.1' compile 'com.android.support:design:24.2.1' compile 'com.squareup.okhttp3:okhttp:3.4.1'//依賴 testCompile 'junit:junit:4.12'}