Add guard to prevent possible IllegalStateException

Bug: 5227682
Change-Id: Iff93b425f52981b5e2c65e309b07bcfe4485eeb1

java/src/com/android/inputmethod/keyboard/LatinKeyboardView.java

@@ -495,6 +495,9 @@ public class LatinKeyboardView extends KeyboardView implements PointerTracker.Ke
 
     @Override
     public boolean onTouchEvent(MotionEvent me) {
+        if (getKeyboard() == null) {
+            return false;
+        }
         return mTouchScreenRegulator.onTouchEvent(me);
     }
 

java/src/com/android/inputmethod/keyboard/PointerTracker.java

@@ -283,7 +283,7 @@ public class PointerTracker {
         mListener.onCancelInput();
     }
 
-    public void setKeyDetectorInner(KeyDetector keyDetector) {
+    private void setKeyDetectorInner(KeyDetector keyDetector) {
         mKeyDetector = keyDetector;
         mKeyboard = keyDetector.getKeyboard();
         mKeys = mKeyboard.mKeys;