Hide keyboard when touch outside EditText

You can put this up in a utility class, or if you are defining it within an activity, avoid the activity parameter, or call hideSoftKeyboard(this). The trickiest part is when to call it. You can write a method that iterates through every View in your activity, and check if it is an instanceof EditText if it is not register a setOnTouchListener to that component and everything will fall in place. In case you are wondering how to do that, it is in fact quite simple. Here is what you do, you write a recursive method like the following, in fact you can use this to do anything, like setup custom typefaces etc... Here is the method.

1.activity_main.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical" android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:padding="5dp"
    android:background="#cacaca"
    android:id="@+id/activity_main">

    <EditText
        android:layout_width="match_parent"
        android:layout_height="50dp"
        android:inputType="text"
        android:background="#fff"/>
</LinearLayout>

2.MainActivity.java

import android.app.Activity;
import android.content.Context;
import android.os.Bundle;
import android.view.MotionEvent;
import android.view.View;
import android.view.ViewGroup;
import android.view.inputmethod.InputMethodManager;
import android.widget.EditText;
import android.widget.ScrollView;

public class MainActivity extends Activity {
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        setHideKeyboardOnTouch(this, findViewById(R.id.activity_main));
    }

    public static void setHideKeyboardOnTouch(final Context context, View view) {
        //Set up touch listener for non-text box views to hide keyboard.
        try {
            //Set up touch listener for non-text box views to hide keyboard.
            if (!(view instanceof EditText || view instanceof ScrollView)) {

                view.setOnTouchListener(new View.OnTouchListener() {

                    public boolean onTouch(View v, MotionEvent event) {
                        InputMethodManager in = (InputMethodManager) context.getSystemService(Context.INPUT_METHOD_SERVICE);
                        in.hideSoftInputFromWindow(v.getWindowToken(), InputMethodManager.HIDE_NOT_ALWAYS);
                        return false;
                    }

                });
            }
            //If a layout container, iterate over children and seed recursion.
            if (view instanceof ViewGroup) {

                for (int i = 0; i < ((ViewGroup) view).getChildCount(); i++) {

                    View innerView = ((ViewGroup) view).getChildAt(i);

                    setHideKeyboardOnTouch(context, innerView);
                }
            }
        }catch (Exception e){
            e.printStackTrace();
        }
    }
}