Android:Hide keyboard after button click

You could instead set it to your layout, ie:

LinearLayout mainLayout;

// Get your layout set up, this is just an example
mainLayout = (LinearLayout)findViewById(R.id.myLinearLayout);

// Then just use the following:
InputMethodManager imm = (InputMethodManager)getSystemService(Context.INPUT_METHOD_SERVICE);
imm.hideSoftInputFromWindow(mainLayout.getWindowToken(), 0);

This is an example assuming that your layout will be created regardless of how many EditText objects (or other objects) are placed on it.

Edit: Also, something I find very useful is to make sure that the keyboard is hidden when an activity first launches (ie: if an EditText is the first thing focused). To do that, I put this in onCreate() method of Activity:

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

Dont forget to use try catch blog because in case when your keyboard not open and if you use key key board hide code app will crash

try {
    InputMethodManager imm = (InputMethodManager)getSystemService(INPUT_METHOD_SERVICE);
    imm.hideSoftInputFromWindow(getCurrentFocus().getWindowToken(), 0);
} catch (Exception e) {
    // TODO: handle exception
}

You can hide the keyboard using the following code, probably on the Button click Event :

//================ Hide Virtual Key Board When  Clicking==================//

InputMethodManager imm = (InputMethodManager)getSystemService(Context.INPUT_METHOD_SERVICE);
imm.hideSoftInputFromWindow("Your Button/EditText Object".getWindowToken(), InputMethodManager.RESULT_UNCHANGED_SHOWN);

//======== Hide Virtual Keyboard =====================//