title: OkHttp, Android - download a html page and display this content in a view
body: <p>I would like download a html page in order to display some information in a TextView. Everytime, my program displays "error" in the TextView. Why doesn't my program  work ?</p>
  
  <p>I add in the AndroidManifest.xml file, this line:</p>
  
  <pre><code>&lt;uses-permission android:name="android.permission.INTERNET" /&gt;
  </code></pre>
  
  <p>Here my activity_main.xml file:</p>
  
  <pre><code>      &lt;?xml version="1.0" encoding="utf-8"?&gt;
        &lt;relativelayout 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: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="blabla.test.mainactivity"&gt;
  
            &lt;textview
                android:id="@+id/aff"
                android:layout_width="100dp"
                android:layout_height="100dp"
                android:text="error" /&gt;
        &lt;/relativelayout&gt;
  </code></pre>
  
  <p>And here my MainActivity.java:</p>
  
  <pre><code>    package blabla.test;
  
      import android.support.v7.app.AppCompatActivity;
      import android.os.Bundle;
      import android.util.Log;
      import android.widget.TextView;
  
      import java.io.IOException;
  
      import okhttp3.Call;
      import okhttp3.Callback;
      import okhttp3.OkHttpClient;
      import okhttp3.Request;
      import okhttp3.Response;
  
  
      public class MainActivity extends AppCompatActivity {
  
          public static String test = "error";
  
          @Override
          protected void onCreate(Bundle savedInstanceState)  {
              super.onCreate(savedInstanceState);
              setContentView(R.layout.activity_main);
  
              String url = "http://square.github.io/okhttp/";
              OkHttpClient client = new OkHttpClient();
              Request request = new Request.Builder()
                      .url(url)
                      .build();
  
              client.newCall(request).enqueue(new Callback() {
                  @Override
                  public void onFailure(Call call, IOException e) {
                      Log.e("APp", e.toString());
                  }
                  @Override
                  public void onResponse(Call call, Response response) throws IOException {
                      if (response.isSuccessful()) {
  
                         MainActivity.test = response.body().string();
                          }else{
                              Log.e("APp", "Error");
                          }
                      }
                  });
  
              TextView aff = (TextView) findViewById(R.id.aff);
              aff.setText(MainActivity.test);
              }
          }
  </code></pre>
  
  <p>I thank you in advance for your help :)</p>