用非活动类编写的警报对话框在从调用活动中解除时不显示警报对话框

Question

I crate a class called "Dailog" for building alert dialog which has its own dismiss() method to dismiss the dialog. and then use it's Object in many screens where I need to show alert dialog.

In my calling Activity class I create instance of Dailog class, and then call up method which does some network operation(which is not async task) and then when network task is finished I dismis the dialog object. I need wait on the same screen untill networks operation finishes but with dialog showing something is happening.

While debugging I do see that that dialog object is not null. No exception throughout this execution but alert dialog never shows up

public class Dialog  {

    private AlertDialog dialog  ;
    private AlertDialog.Builder builder;

    public Dialog(Activity activity , String Message , String titleMsg) {
        builder = new AlertDialog.Builder(activity);
        builder.setMessage(Message);
        builder.setTitle(titleMsg);
        builder.setCancelable(false);
        builder.setIcon(R.drawable.logoxl);
        dialog = builder.create();
        dialog.show();
    }
 public void dismiss(){
        this.dialog.dismiss();
    }

}


// my activity method(openMenu) on button click where I am calling this 

public void OpenMenu(View view){
 Dialog progress = new Dialog(this , "We are fetching today's menu...Please Wait" , "Biji's Kitchen");
        try {
            Data fetcheddata = new Data(this);           
            fetcheddata.getMenu();
        }catch(Exception e){
            e.printStackTrace();

        }
 progress.dismiss();
}

Answer 1

Data.getMenu() is network operation and should be executed in the separate thread. Dialog.dismiss() , on the other hand, is UI operation and should be executed in main thread.

So, in Data thread you should wait for network request completion and then post message to UI thread to dismiss the dialog after that.

PS To be more clear: your current implementation does show dialog - and immediately dismisses it as show and dismiss are called one after another in UI thread but data is still loading in another thread.

Answer 2

Try commenting this Line. I hope it should work.

//progress.dismiss();