如何从异步调用返回结果

Question

我在自己的类中拥有所有异步调用，因此我不想将aync’ly设置为全局变量。为此，我想从我的asunc postProcess方法返回对象，例如字符串。

能做到吗？

下面是我类的一般结构，例如，我想从onPostExecute（）返回一个字符串。我看到在其他地方提到了委托，但这似乎很混乱，确定有办法为类或方法提供返回类型吗？

class GetStuffAsyncly extends AsyncTask<String, String, String>
{
    // my vars....

    public myconstructor(String dialogMessage, Context con)
    {
        this.qDialog =  new ProgressDialog(con);
        this.dialogString = dialogMessage;
        this.context = con;
    }

    /**
     * Before starting background thread Show Progress Dialog
     * */
    @Override
    protected void onPreExecute()
    {
        super.onPreExecute();
        do stuff like fire dialog
    }

    @Override
    protected String doInBackground(String... args)
    {
       // do stuff in background...

        return data;
    }

    /**
     * After completing background task Dismiss the progress dialog
     * **/
    protected void onPostExecute(String jsonString)
    {
        // dismiss the dialog after getting all data
        dialog.dismiss();
    }
}

Answer 1

像下面这样

class GetStuffAsyncly extends AsyncTask<String, String, String> {
    String dialogString;
    ProgressDialog dialog;
    Context context;
    AsyncListener listener;
    // my vars....

    public GetStuffAsyncly(String dialogMessage, Context con, AsyncListener listener) {
        this.dialog = new ProgressDialog(con);
        this.dialogString = dialogMessage;
        this.context = con;
        this.listener = listener;
    }

    /**
     * Before starting background thread Show Progress Dialog
     */
    @Override
    protected void onPreExecute() {
        super.onPreExecute();
        listener.onTaskStarted();
    }

    @Override
    protected String doInBackground(String... args) {
        // do stuff in background...

        return data;
    }

    /**
     * After completing background task Dismiss the progress dialog
     **/
    protected void onPostExecute(String jsonString) {
        // dismiss the dialog after getting all data
        dialog.dismiss();
        listener.onTaskFinished(jsonString);
    }
}

和听众课

public interface AsyncListener {
    void onTaskStarted();

    void onTaskFinished(String data);
}

你可以这样打电话

new GetStuffAsyncly(message, this, new AsyncListener() {
            @Override
            public void onTaskStarted() {
                //do your stuff
            }

            @Override
            public void onTaskFinished(String data) {
//Do your stuff;
            }
        }).execute(parameter);