Question

*************问题未解决，请检查以下解决方案*************

近半天我一直在努力。无法使其正常工作。我有私有方法的AsyncTask，所以我可以在CustomLvAdapter中传递boolean和String值

  private void changeJobStatus(final boolean isAppliedforAJob, final String jobID){
    class ChangeJobStatus extends AsyncTask<Void,Void,String> {
        //private Delegates del = null;

        ProgressDialog loading;

        @Override
        protected void onPreExecute() {
            super.onPreExecute();
            if(isAppliedforAJob) {
                loading = ProgressDialog.show(context, "","Canceling application", false);
            }
            else {
                loading = ProgressDialog.show(context, "","Applying for position", false);
            }
        }

        @Override
        protected void onPostExecute(String s) {
            super.onPostExecute(s);
            //del.asyncCompleteOnCustomJob(true);
            loading.dismiss();
        }

        @Override
        protected String doInBackground(Void... v) {
            String res;
            HashMap<String,String> params = new HashMap<>();
            params.put(Config.KEY_USER_ID, studentID);
            params.put(Config.KEY_JOB_ID, jobID);

            RequestHandler rh = new RequestHandler();
            if(isAppliedforAJob)
                res = rh.sendPostRequest(Config.URL_CANCEL_APPLICATION, params);
            else
                res = rh.sendPostRequest(Config.URL_APPLY_FOR_A_JOB, params);
            Log.d("Stringas", "CustomListViewBackground " + res);
            return res;
        }
    }

    ChangeJobStatus cjs = new ChangeJobStatus();
    cjs.execute();
}

并在onPostExcecute（）中我想将notifyOnDataSetChanged（）调用到我的另一个活动lvAdapters。据我所知，我必须实现委托接口，但我没有成功。我在主类中初始化委托时失败了，因为changeJobStatus方法是私有的，它在customLvAdapter类中调用。

如果我在ChangeJobStatus类中创建一个构造函数

      public ChangeJobStatus(Delegates delegate)
        {
             this.del = delegate;
        }

我必须在参数中传递一些东西。如果我传递新的委托，则不会触发我的另一个活动中的委托实现。

 ChangeJobStatus cjs = new ChangeJobStatus(new Delegates() {
        @Override
        public void asyncCompleteOnCustomJob(boolean success) {
            //whatever
        }
    });
    cjs.execute();

我希望你能帮助我找出正确的实施方案，干杯

*********** SOLUTION ***********

可悲的是，我无法实现用户给我的内容，但我很高兴听到你们其中一个人可以使用广播接收器。它奏效了。这就是我所做的

在主课程中创建广播接收器

 private final BroadcastReceiver broadcastJobList = new BroadcastReceiver() {
    @Override
    public void onReceive(Context context, Intent intent) {
       //what will happen, when event triggers
    }
};

注册自定义意图并将其注册到主类onCreate方法中的广播接收器或您感觉舒适的地方：）

    IntentFilter filter = new IntentFilter();

    filter.addAction("jobListChanged");
    registerReceiver(broadcastJobList, filter);

我们要做的就是发送意图，它将触发广播接收器。我的场景中的以下代码转到自定义适配器中的onPostExcecute方法（在自定义适配器的开始时为Context初始化了上下文）

 Intent intent = new Intent();
            intent.setAction("jobListChanged");
            context.sendBroadcast(intent);

希望我会帮助有这个问题的人。干杯！

Answer 1

//你的asynctask类

 public class ChangeJobStatus extends AsyncTask<String, Void, String> {


        private ProgressDialog loading;
        private OnResponseListener responseListener;
        private boolean isAppliedforAJob;
        private Context con;

        public ChangeJobStatus(Context con,boolean state) {
            super();
            // TODO Auto-generated constructor stub
            this.con=con;
            isAppliedforAJob = state;
        }

        public void setOnResponseListener(OnResponseListener onLoadMoreListener) {
            this.responseListener = onLoadMoreListener;
        }

        public interface OnResponseListener {
            public void onResponse(String responsecode);
        }

        @Override
        protected void onPreExecute() {
            super.onPreExecute();
            if (isAppliedforAJob) {
                loading = ProgressDialog.show(con, "", "Canceling application", false);
            } else {
                loading = ProgressDialog.show(con, "", "Applying for position", false);
            }
        }

        @Override
        protected void onPostExecute(String s) {
            super.onPostExecute(s);
            // del.asyncCompleteOnCustomJob(true);
            loading.dismiss();

            responseListener.onResponse(s);
        }

        @Override
        protected String doInBackground(String... param) {

            String res="";
            HashMap<String, String> params = new HashMap<>();
            params.put(Config.KEY_JOB_ID, param[0]);// job id
            params.put(Config.KEY_USER_ID, param[1]);// student id


            RequestHandler rh = new RequestHandler();
            if (isAppliedforAJob)
                res = rh.sendPostRequest(Config.URL_CANCEL_APPLICATION, params);
            else
                res = rh.sendPostRequest(Config.URL_APPLY_FOR_A_JOB, params);

            return res;
        }
    }

在您的活动类

中

public class MainActivity extends Activity implements OnResponseListener {

    String jobId="1",studId="1";
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        ChangeJobStatus cbs=new ChangeJobStatus(this, true);
        cbs.setOnResponseListener(this);
        cbs.execute(jobId,studId);
    }


    @Override
    public void onResponse(String responsecode) {
        // TODO Auto-generated method stub
        //here u can do ur stuff with the string
    }
}

在AsyncTask中调用notifyOnDataSetChanged（不在类中）

1 个答案: