android: can't compare strings with == in Java

Change-Id: I5cf4d5db42f32b7c073e5899a6c90a3354dcb3c5

android/experimental/LOAndroid3/src/java/org/libreoffice/LOKitThread.java

@@ -212,7 +212,7 @@ public class LOKitThread extends Thread implements TileProvider.TileInvalidation
         if (mTileProvider == null) {
             return;
         }
-        if (keyEventType == "KeyPress") {
+        if (keyEventType.equals("KeyPress")) {
             mTileProvider.keyPress(keyEvent);
         } else if (keyEventType.equals("KeyRelease")) {
             mTileProvider.keyRelease(keyEvent);