How to open Keyboard on Button click in android?

Question

How can I open Keyboard on Button click in android?

What I want to be like this:

Answer 1

InputMethodManager imm = (InputMethodManager) activity.getSystemService(Context.INPUT_METHOD_SERVICE);

imm.showSoftInput(view, flags)

an example may be:

InputMethodManager imm = (InputMethodManager) RouteMapActivity.this
    .getSystemService(Context.INPUT_METHOD_SERVICE);
imm.showSoftInput(mapView, InputMethodManager.SHOW_IMPLICIT);