how to toast a message if editText is empty by clicking button?

Question

i have 2 edit Text in my application, 1 button to add the input numbers in the edit Text and 1 text view to display the result. I would like to put a toast message if my edit te

Answer 1

Your code will be:

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);

    final EditText editText1 = (EditText)findViewById(R.id.editText1);
    final EditText editText2 = (EditText)findViewById(R.id.editText2);
    Button button1 = (Button)findViewById(R.id.button1);
    final TextView textView1 = (TextView)findViewById(R.id.textView1);
    textView1.setText(" ");

    button1.setOnClickListener(new OnClickListener() {

        @Override
        public void onClick(View v) {        
            if(editText1.getText().toString().trim().length() == 0 || editText2.getText().toString().trim().length() == 0) {
                Toast.makeText(this,"Edittext is null",Toast.LENGTH_SHORT).show();
            }
            else {
                  double edit1 = Double.valueOf(editText1.getText().toString());  
                  double edit2 = Double.valueOf(editText2.getText().toString());
                  double text = edit1 + edit2;
                  textView1.setText(String.valueOf(text));
            }
        });
    }
}