Android: How to set the contents of a Edit text from a Button click?

Question

I am a rookie to android. I am thinking of implementing a simple calculator in android to get a hold of the basics in android. I want to display a keypad with numbers and mathematical operations and when the user presses the keys the corresponding number is displayed in edit text. I tried using gettext() and updating the contents of edit text but it shows just the contents of pressed button. Also how do I read the contents of button so as to do mathematical operations in code? Any help would be much appreciated.

regards,

Primal

Answer 1

To set the contents of an EditText:

EditText text = (EditText) findViewById(R.id.your_text);
text.setText("Display this text");

Instead of trying to pull the text off of your buttons and use it as an integer, I would just add a click listener to each one that "knows" the value of its button:

Button button = (Button) findViewById(R.id.num_1);
button.setOnClickListener(new View.OnClickListener() {
    @Override public void onClick(View v) {
        // Do something with the value of the button
    }
});