Do not use InputType.TYPE_NULL, instead set the password field as non focusable, non clickable. Props @tonyr59h

Author: daniloercoli

library/res/layout/app_passcode_keyboard.xml

@@ -48,6 +48,8 @@
             android:layout_height="wrap_content"
             android:layout_marginRight="38dp"
             android:hint="@string/passcodelock_hint"
+            android:focusable="false"
+            android:clickable="false"
             android:maxLength="4"
             android:inputType="numberPassword"
             android:background="@color/white" />

library/src/org/wordpress/passcodelock/AbstractPasscodeKeyboardActivity.java

@@ -6,7 +6,6 @@
 import android.support.v4.hardware.fingerprint.FingerprintManagerCompat;
 import android.support.v4.os.CancellationSignal;
 import android.text.InputFilter;
-import android.text.InputType;
 import android.text.Spanned;
 import android.view.Gravity;
 import android.view.View;
@@ -52,8 +51,7 @@ protected void onCreate(Bundle savedInstanceState) {
         filters[1] = onlyNumber;
 
         mPinCodeField = (EditText)findViewById(R.id.pin_field);
-        mPinCodeField.setInputType(InputType.TYPE_NULL);
-        
+
         //setup the keyboard
         findViewById(R.id.button0).setOnClickListener(defaultButtonListener);
         findViewById(R.id.button1).setOnClickListener(defaultButtonListener);