EditText

To show Edittext immediately when open new screen, add this line in AndroidManifest.xml

android:windowSoftInputMode="stateAlwaysVisible"

Otherwise, to prevent Edittext show, change to

android:windowSoftInputMode="stateAlwaysHidden"

To show number phone keyboard, add this line below setContentView.

e.setRawInputType(Configuration.KEYBOARD_QWERTY);

Press Ctrl+Shift+O  to clear red mark errors.

To show text hint inside Edittext, add this line in xml

android:hint="Text to show"

To set max character user can type in EditText, for example 30 characters, add this line.
 android:max="30"