Fix virtual keyboard for decimal values on Android

(cherry picked from commit 6f91c000565ed5c273e6ebb978a0d00d75ab6788)

platform/android/java/lib/src/org/godotengine/godot/input/GodotEditText.java

@@ -34,10 +34,13 @@ import org.godotengine.godot.*;
 
 import android.content.Context;
 import android.content.res.Configuration;
+import android.os.Build;
 import android.os.Handler;
 import android.os.Message;
 import android.text.InputFilter;
 import android.text.InputType;
+import android.text.TextUtils;
+import android.text.method.DigitsKeyListener;
 import android.util.AttributeSet;
 import android.view.KeyEvent;
 import android.view.inputmethod.EditorInfo;
@@ -45,6 +48,7 @@ import android.view.inputmethod.InputMethodManager;
 import android.widget.EditText;
 
 import java.lang.ref.WeakReference;
+import java.util.Locale;
 
 public class GodotEditText extends EditText {
 	// ===========================================================
@@ -137,6 +141,7 @@ public class GodotEditText extends EditText {
 					}
 
 					int inputType = InputType.TYPE_CLASS_TEXT;
+					String acceptCharacters = null;
 					switch (edit.getKeyboardType()) {
 						case KEYBOARD_TYPE_DEFAULT:
 							inputType = InputType.TYPE_CLASS_TEXT;
@@ -148,7 +153,8 @@ public class GodotEditText extends EditText {
 							inputType = InputType.TYPE_CLASS_NUMBER;
 							break;
 						case KEYBOARD_TYPE_NUMBER_DECIMAL:
-							inputType = InputType.TYPE_CLASS_NUMBER | InputType.TYPE_NUMBER_FLAG_SIGNED;
+							inputType = InputType.TYPE_CLASS_NUMBER | InputType.TYPE_NUMBER_FLAG_SIGNED | InputType.TYPE_NUMBER_FLAG_DECIMAL;
+							acceptCharacters = "0123456789,.- ";
 							break;
 						case KEYBOARD_TYPE_PHONE:
 							inputType = InputType.TYPE_CLASS_PHONE;
@@ -165,6 +171,14 @@ public class GodotEditText extends EditText {
 					}
 					edit.setInputType(inputType);
 
+					if (!TextUtils.isEmpty(acceptCharacters)) {
+						if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
+							edit.setKeyListener(DigitsKeyListener.getInstance(Locale.getDefault()));
+						} else {
+							edit.setKeyListener(DigitsKeyListener.getInstance(acceptCharacters));
+						}
+					}
+
 					edit.mInputWrapper.setOriginText(text);
 					edit.addTextChangedListener(edit.mInputWrapper);
 					final InputMethodManager imm = (InputMethodManager)mRenderView.getView().getContext().getSystemService(Context.INPUT_METHOD_SERVICE);