[android help] Showing a message dialog in Android

Showing a message dialog in Android

Today I've started to build my first android app, I'm used to work with Java but there are something that I don't know how to do in my android app. It's a simple calculator, and I'm trying to show a message dialog if the user inputs an invalid number.

Here's my code:

public void calculate(View v) {
    EditText theNumber = (EditText) findViewById(R.id.number);
    int num;
    try {
        num = Integer.parseInt(theNumber.getText().toString());
    } catch (NumberFormatException e) {
        //missing code here
    }
}

In Java SE I'd just do this:

public void calculate(View v) {
    EditText theNumber = (EditText) findViewById(R.id.number);
    int num;
    try {
        num = Integer.parseInt(theNumber.getText().toString());
    } catch (NumberFormatException e) {
        JOptionPane.showMessageDialog("Invalid input");
    }
}

How can I do that in android?

.

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