OkHttp的用法

1.activity_main.xml

  

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
    android:id="@+id/activity_main"
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
    android:paddingBottom="@dimen/activity_vertical_margin"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    tools:context="com.sh.newworktest.MainActivity">


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

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

2.MainActivity.java

  
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.responst_text);
        sendRequest.setOnClickListener(this);
    }

    @Override
    public void onClick(View v) {
           switch (v.getId()){
              case R.id.send_request:
//                   sendRequestWithHttpURLConnection();
                     sendRequestWithOkHttp();
                  break;
               default:
           }
    }

    private void sendRequestWithOkHttp(){
        //开启线程来发起网络的请求
        new Thread(new Runnable() {
            @Override
            public void run() {
                try {
                    //1.先创建一个OkHttpClient的实例
                    OkHttpClient client = new OkHttpClient();
                    // 2.想要发出一条Http请求，就需要创建一个Request的对象
                    Request request = new Request.Builder()
                            .url("http://www.baidu.com")
                            .build();
                    //3.调用OkHttpClient的newCall（）方法来创建一个Call对象，并调用它的execute方法来发送请求服务器返回的数据
                    Response response = client.newCall(request).execute();
                    String responseData = response.body().string();
                    showResponse(responseData);
                } catch (Exception e){
                     e.printStackTrace();
                }
            }
        }).start();
    }
   
}
3.AndroidManifest.xml
<?xml version="1.0" encoding="utf-8"?>
<manifest package="com.sh.newworktest"
          xmlns:android="http://schemas.android.com/apk/res/android">

  ......
   <uses-permission android:name="android.permission.INTERNET"/>
</manifest>