捕获不执行吐司

Question

I want to show a message to the users when they click "Bintro" button and the EditTexts were empty.

I have the next code:

Bintro.setOnClickListener(new View.OnClickListener() {
        String eva;
        double por, not;

        @Override
        public void onClick(View v){

            try{
                eva = edEva.getText().toString();
                por = Double.parseDouble(edPor.getText().toString());
                not = Double.parseDouble(edNot.getText().toString());
            }
            catch (Exception e){
                Toast.makeText(getApplicationContext(), "Faltan datos por introducir", Toast.LENGTH_LONG);
                return;
            }

//The code continues down here but it's irrelevant to solve the question.

My problem is that when I click the button and there is no EditText filled, the 'catch' doesn't execute the Toast message but, however, it returns the app progress out of the onClick method. When they are filled, the app executes the code below 'catch' perfectly.

Hope you can help with my code or with another way to do it. Thanks.

Answer 1

you're not showing your toast. add:

    Toast.makeText(getApplicationContext(), "Faltan datos por introducir", Toast.LENGTH_LONG).show();

Answer 2

Try

  catch (Exception e){
            Toast.makeText(v.getContext(), "Faltan datos por introducir", Toast.LENGTH_LONG).show();
            return;
        }

Answer 3

您未在以下位置使用：

Toast.makeText(class_name.this, "Message_name",Toast.LENGTH_LONG).show();