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:)

嗨，你可以做这样的东西:

Create class which implements AsyncTask // TASK public class SomeClass extends AsyncTask<Void, Void, String>> { private OnTaskExecutionFinished _task_finished_event; public interface OnTaskExecutionFinished { public void OnTaskFihishedEvent(String Reslut); } public void setOnTaskFinishedEvent(OnTaskExecutionFinished _event) { if(_event != null) { this._task_finished_event = _event; } } @Override protected void onPreExecute() { super.onPreExecute(); } @Override protected String doInBackground(Void... params) { // do your background task here ... return "Done!"; } @Override protected void onPostExecute(String result) { super.onPostExecute(result); if(this._task_finished_event != null) { this._task_finished_event.OnTaskFihishedEvent(result); } else { Log.d("SomeClass", "task_finished even is null"); } } } Add in Main Activity // MAIN ACTIVITY public class MyActivity extends ListActivity { ... SomeClass _some_class = new SomeClass(); _someclass.setOnTaskFinishedEvent(new _some_class.OnTaskExecutionFinished() { @Override public void OnTaskFihishedEvent(String result) { Toast.makeText(getApplicationContext(), "Phony thread finished: " + result, Toast.LENGTH_SHORT).show(); } }); _some_class.execute(); ... }

试试这个:

public class SomAsyncTask extends AsyncTask<String, Integer, JSONObject> {

    private CallBack callBack;

    public interface CallBack {
        void async( JSONObject jsonResult );
        void sync( JSONObject jsonResult );
        void progress( Integer... status );
        void cancel();
    }

    public SomAsyncTask(CallBack callBack) {
        this.callBack = callBack;
    }

    @Override
    protected JSONObject doInBackground(String... strings) {

        JSONObject dataJson = null;

        //TODO query, get some dataJson

        if(this.callBack != null)
            this.callBack.async( dataJson );// asynchronize with MAIN LOOP THREAD

        return dataJson;

    }

    @Override
    protected void onProgressUpdate(Integer... values) {
        super.onProgressUpdate(values);

        if(this.callBack != null)
            this.callBack.progress(values);// synchronize with MAIN LOOP THREAD

    }

    @Override
    protected void onPostExecute(JSONObject jsonObject) {
        super.onPostExecute(jsonObject);

        if(this.callBack != null)
            this.callBack.sync(jsonObject);// synchronize with MAIN LOOP THREAD
    }

    @Override
    protected void onCancelled() {
        super.onCancelled();

        if(this.callBack != null)
            this.callBack.cancel();

    }
}

用法示例:

public void onCreate(@Nullable Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);

         final Context _localContext = getContext();
         SomeAsyncTask.CallBack someCallBack = new SomeAsyncTask.CallBack() {

                @Override
                public void async(JSONObject jsonResult) {//async thread
                    //some async process, e.g. send data to server...
                }

                @Override
                public void sync(JSONObject jsonResult) {//sync thread
                    //get result...

                    //get some resource of Activity variable...
                    Resources resources = _localContext.getResources();
                }

                @Override
                public void progress(Integer... status) {//sync thread
                    //e.g. change status progress bar...
                }

                @Override
                public void cancel() {

                }

            };

            new SomeAsyncTask( someCallBack )
                                .execute("someParams0", "someParams1", "someParams2");

    }

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

你可以调用AsyncTask的get()方法(或者重载的get(long, TimeUnit))。此方法将阻塞，直到AsyncTask完成它的工作，此时它将返回Result。

在创建/启动异步任务和调用get方法之间做其他工作是明智的，否则你不能非常有效地利用异步任务。

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 ... }