Question

I am trying to get a message to appear when a button is clicked to tell the user to fill in the blank field. Currently, if the field is blank, it crashes/force closes the app. I tried to do the following code and had zero success. Originally I didn’t have the if/else in there, I just ran the calculator(); method and the following imm code.

Could someone point me into the right direction?

  public void onClick(View  v) 
  { 
     if ((EditText)findViewById(R.id.amount1)== null)
     {
          Context context = getApplicationContext();
          CharSequence text = "Enter a number";
          int duration = Toast.LENGTH_SHORT;

          Toast toast = Toast.makeText(context, text, duration);
          toast.show();
     }
     else
     {
      calculator();
      InputMethodManager imm = (InputMethodManager) getSystemService(INPUT_METHOD_SERVICE);
      imm.hideSoftInputFromWindow(getCurrentFocus().getWindowToken(), 0);
     }
  }

Im pretty sure this is the bad code:

if ((EditText)findViewById(R.id.amount1)== null)

Just dont know how to word it the way I want.

Answer 1

Try checking the length of the text in the EditText widget

EditText e = (EditText)findViewById(R.id.amount1));
if(e.getText().length == 0){
//Show Toast
}else{
//continue your code
}