Fixed missing imports in SDLActivity (thanks @guusw!)
diff --git a/android-project/app/src/main/java/org/libsdl/app/SDLActivity.java b/android-project/app/src/main/java/org/libsdl/app/SDLActivity.java
index 3f0752f..d982943 100644
--- a/android-project/app/src/main/java/org/libsdl/app/SDLActivity.java
+++ b/android-project/app/src/main/java/org/libsdl/app/SDLActivity.java
@@ -27,7 +27,9 @@ import android.os.Build;
import android.os.Bundle;
import android.os.Handler;
import android.os.Message;
+import android.text.Editable;
import android.text.InputType;
+import android.text.Selection;
import android.util.DisplayMetrics;
import android.util.Log;
import android.util.SparseArray;