有以下几种选择:

Nest the AsyncTask class within your Activity class. Assuming you don't use the same task in multiple activities, this is the easiest way. All your code stays the same, you just move the existing task class to be a nested class inside your activity's class. public class MyActivity extends Activity { // existing Activity code ... private class MyAsyncTask extends AsyncTask<String, Void, String> { // existing AsyncTask code ... } } Create a custom constructor for your AsyncTask that takes a reference to your Activity. You would instantiate the task with something like new MyAsyncTask(this).execute(param1, param2). public class MyAsyncTask extends AsyncTask<String, Void, String> { private Activity activity; public MyAsyncTask(Activity activity) { this.activity = activity; } // existing AsyncTask code ... }

您可以在Main类中尝试此代码。 这对我来说很有效，但我已经用其他方式实现了方法

try {
    String receivedData = new AsyncTask().execute("http://yourdomain.com/yourscript.php").get();
} 
catch (ExecutionException | InterruptedException ei) {
    ei.printStackTrace();
}

希望你已经读过了，如果没有，请阅读。

https://developer.android.com/reference/android/os/AsyncTask

根据结果数据的性质，您应该选择您能想到的最佳选项。

使用接口是一个很好的选择

其他的选择是…

If the AsyncTask class is defined inside the very class you want to use the result in.Use a static global variable or get() , use it from outer class (volatile variable if necessary). but should be aware of the AsyncTask progress or should at least make sure that it have finished the task and result is available through global variable / get() method. you may use polling, onProgressUpdate(Progress...), synchronization or interfaces (Which ever suits best for you) If the Result is compatible to be a sharedPreference entry or it is okay to be saved as a file in the memory you could save it even from the background task itself and could use the onPostExecute() method to get notified when the result is available in the memory. If the string is small enough, and is to be used with start of an activity. it is possible to use intents (putExtra()) within onPostExecute() , but remember that static contexts aren't that safe to deal with. If possible, you can call a static method from the onPostExecute() method, with the result being your parameter

在Activity类中创建一个静态成员。然后在onPostExecute期间分配该值

例如，如果你的AsyncTask的结果是一个字符串，在你的Activity中创建一个公共静态字符串

datfromasynctask;

然后，在AsyncTask的onPostExecute中，简单地对主类进行静态调用并设置值。

MainActivity。dataFromAsyncTask = "result blah";

你可以在几行中完成，只是在调用AsyncTask时覆盖onPostExecute。这里有一个例子:

new AasyncTask()
{
    @Override public void onPostExecute(String result)
    {
       // do whatever you want with result 
    }
}.execute(a.targetServer);

我希望这对你有帮助，编码快乐:)

可能有点过分了，但我为执行代码和结果都提供了回调。显然，为了线程安全，你要小心你在执行回调中访问的内容。

AsyncTask实现:

public class AsyncDbCall<ExecuteType,ResultType> extends AsyncTask<ExecuteType, Void,  
ResultType>
{
    public interface ExecuteCallback<E, R>
    {
        public R execute(E executeInput);
    }
    public interface PostExecuteCallback<R>
    {
        public void finish(R result);
    }

    private PostExecuteCallback<ResultType> _resultCallback = null;
    private ExecuteCallback<ExecuteType,ResultType> _executeCallback = null;


    AsyncDbCall(ExecuteCallback<ExecuteType,ResultType> executeCallback, PostExecuteCallback<ResultType> postExecuteCallback)
    {
        _resultCallback = postExecuteCallback;
        _executeCallback = executeCallback;
    }

    AsyncDbCall(ExecuteCallback<ExecuteType,ResultType> executeCallback)
    {
        _executeCallback = executeCallback;
    }

    @Override
    protected ResultType doInBackground(final ExecuteType... params)
    {
        return  _executeCallback.execute(params[0]);
    }

    @Override
    protected void onPostExecute(ResultType result)
    {
        if(_resultCallback != null)
            _resultCallback.finish(result);
    }
}

一个回调:

 AsyncDbCall.ExecuteCallback<Device, Device> updateDeviceCallback = new 
 AsyncDbCall.ExecuteCallback<Device, Device>()
    {
        @Override
        public Device execute(Device device)
        {
            deviceDao.updateDevice(device);
            return device;
        }
    };

最后执行异步任务:

 new AsyncDbCall<>(addDeviceCallback, resultCallback).execute(device);