okHttp：为什么我的应用程序崩溃没有得到响应

Question

主要活动

公共类MainActivity扩展AppCompatActivity{String response；

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

  try {
      response = example.run();
      Toast.makeText(MainActivity.this, "response is :" + response, Toast.LENGTH_LONG).show();

  } catch (IOException e) {
      Toast.makeText(MainActivity.this, "error" + e, Toast.LENGTH_LONG).show();

   }
  }
 }

公共类GetExample{OkHttpClient客户端；

public String run() throws IOException {
     client = new OkHttpClient();
    Request request = new Request.Builder().url("http://grocit.pe.hu/getcategories.php").build();
    Response response = client.newCall(request).execute();
    return response.body().string();
}
}

Xml文件

<RelativeLayout
  android:layout_height="match_parent"
   android:layout_width="match_parent"
    xmlns:android="http://schemas.android.com/apk/res/android">
<Button
    android:layout_width="300dp"
    android:layout_height="300dp"
    android:onClick="click"
    android:text="click me!"
    />
</RelativeLayout>

Answer 1

对于这样的崩溃问题，您可以添加您的崩溃日志。我认为NetworkonMaintHreadException.当应用程序尝试在其主线程上执行网络操作时，会引发此异常。您的网络操作必须在另一个线程上执行,如：

    Thread thread = new Thread() {
            @Override
            public void run() {
                // your run method
            }
        };
    thread.start();