Prevent the keyboard from displaying on activity start

Try this -

this.getWindow().setSoftInputMode(WindowManager.LayoutParams.SOFT_INPUT_STATE_ALWAYS_HIDDEN);

Alternatively,

1. you could also declare in your manifest file's activity -

<application android:icon="@drawable/icon" android:label="@string/app_name">
<activity android:name=".Main"
          android:label="@string/app_name"
          android:windowSoftInputMode="stateHidden"
          >

2. If you have already been using android:windowSoftInputMode for a value like adjustResize or adjustPan, you can combine two values like:

<activity
        ...
        android:windowSoftInputMode="stateHidden|adjustPan"
        ...
        >

This will hide the keyboard whenever appropriate but pan the activity view in case the keyboard has to be shown.

I think the following may work

getWindow().setSoftInputMode(WindowManager.LayoutParams.SOFT_INPUT_STATE_HIDDEN);

I've used it for this sort of thing before.