Virtual keyboard size adjustment fixes

1. Disable virtual keyboard focus adjustment on Android
The default adjustment setting was causing the view to pan down in order
to adjust the focus on the text content.
We don't need any focus adjustment since we're using a fixed size window
for our application.
Documentation:
https://developer.android.com/reference/android/view/WindowManager.LayoutParams#SOFT_INPUT_ADJUST_NOTHING

2. Fix virtual keyboard height regression
Disabling virtual keyboard focus adjustement caused get_keyboard_height
to always return 0 because it was calculated when the view is resized.
In order to fix it, a PopupWindow is now created on top of the main view
and is set for focus adjustments so the keyboard size can be calculated
based on this popup without affecting the main view.

platform/android/java/lib/src/org/godotengine/godot/Godot.java

@@ -69,6 +69,7 @@ import android.os.VibrationEffect;
 import android.os.Vibrator;
 import android.provider.Settings.Secure;
 import android.view.Display;
+import android.view.Gravity;
 import android.view.KeyEvent;
 import android.view.MotionEvent;
 import android.view.Surface;
@@ -80,6 +81,7 @@ import android.view.Window;
 import android.view.WindowManager;
 import android.widget.Button;
 import android.widget.FrameLayout;
+import android.widget.PopupWindow;
 import android.widget.ProgressBar;
 import android.widget.TextView;
 
@@ -248,6 +250,8 @@ public abstract class Godot extends FragmentActivity implements SensorEventListe
 	public GodotView mView;
 	private boolean godot_initialized = false;
 
+	private PopupWindow mKeyboardWindow;
+
 	private SensorManager mSensorManager;
 	private Sensor mAccelerometer;
 	private Sensor mGravity;
@@ -316,24 +320,36 @@ public abstract class Godot extends FragmentActivity implements SensorEventListe
 		layout.setLayoutParams(new LayoutParams(LayoutParams.MATCH_PARENT, LayoutParams.MATCH_PARENT));
 		setContentView(layout);
 
+		// Create a popup window with an invisible layout for the virtual keyboard,
+		// so the view can be resized to get the vk height without resizing the main godot view.
+		final FrameLayout keyboardLayout = new FrameLayout(this);
+		keyboardLayout.setLayoutParams(new LayoutParams(LayoutParams.MATCH_PARENT, LayoutParams.MATCH_PARENT));
+		keyboardLayout.setVisibility(View.INVISIBLE);
+		mKeyboardWindow = new PopupWindow(keyboardLayout, LayoutParams.MATCH_PARENT, LayoutParams.MATCH_PARENT);
+		mKeyboardWindow.setSoftInputMode(WindowManager.LayoutParams.SOFT_INPUT_ADJUST_RESIZE);
+		mKeyboardWindow.setInputMethodMode(PopupWindow.INPUT_METHOD_NEEDED);
+		mKeyboardWindow.setFocusable(true); // for the text edit to work
+		mKeyboardWindow.setTouchable(false); // inputs need to go through
+
 		// GodotEditText layout
 		GodotEditText edittext = new GodotEditText(this);
-		edittext.setLayoutParams(new ViewGroup.LayoutParams(LayoutParams.MATCH_PARENT, LayoutParams.WRAP_CONTENT));
+		edittext.setLayoutParams(new LayoutParams(LayoutParams.MATCH_PARENT, LayoutParams.WRAP_CONTENT));
-		// ...add to FrameLayout
+		edittext.setKeyboardView(keyboardLayout);
-		layout.addView(edittext);
+		// ...add to keyboard layout
+		keyboardLayout.addView(edittext);
 
 		mView = new GodotView(this, xrMode, use_gl3, use_32_bits, use_debug_opengl);
 		layout.addView(mView, new LayoutParams(LayoutParams.MATCH_PARENT, LayoutParams.MATCH_PARENT));
 		edittext.setView(mView);
 		io.setEdit(edittext);
 
-		mView.getViewTreeObserver().addOnGlobalLayoutListener(new ViewTreeObserver.OnGlobalLayoutListener() {
+		keyboardLayout.getViewTreeObserver().addOnGlobalLayoutListener(new ViewTreeObserver.OnGlobalLayoutListener() {
 			@Override
 			public void onGlobalLayout() {
 				Point fullSize = new Point();
 				getWindowManager().getDefaultDisplay().getSize(fullSize);
 				Rect gameSize = new Rect();
-				mView.getWindowVisibleDisplayFrame(gameSize);
+				mKeyboardWindow.getContentView().getWindowVisibleDisplayFrame(gameSize);
 
 				final int keyboardHeight = fullSize.y - gameSize.bottom;
 				GodotLib.setVirtualKeyboardHeight(keyboardHeight);
@@ -571,6 +587,7 @@ public abstract class Godot extends FragmentActivity implements SensorEventListe
 		super.onCreate(icicle);
 		Window window = getWindow();
 		window.addFlags(WindowManager.LayoutParams.FLAG_TURN_SCREEN_ON);
+		window.setSoftInputMode(WindowManager.LayoutParams.SOFT_INPUT_ADJUST_NOTHING);
 		mClipboard = (ClipboardManager)getSystemService(Context.CLIPBOARD_SERVICE);
 		pluginRegistry = GodotPluginRegistry.initializePluginRegistry(this);
 
@@ -709,8 +726,21 @@ public abstract class Godot extends FragmentActivity implements SensorEventListe
 		initializeGodot();
 	}
 
+	@Override
+	protected void onStart() {
+		super.onStart();
+
+		mView.post(new Runnable() {
+			@Override
+			public void run() {
+				mKeyboardWindow.showAtLocation(getWindow().getDecorView(), Gravity.NO_GRAVITY, 0, 0);
+			}
+		});
+	}
+
 	@Override
 	protected void onDestroy() {
+		mKeyboardWindow.dismiss();
 
 		for (int i = 0; i < singleton_count; i++) {
 			singletons[i].onMainDestroy();

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

@@ -38,6 +38,7 @@ import android.os.Message;
 import android.text.InputFilter;
 import android.util.AttributeSet;
 import android.view.KeyEvent;
+import android.view.View;
 import android.view.inputmethod.EditorInfo;
 import android.view.inputmethod.InputMethodManager;
 import android.widget.EditText;
@@ -55,6 +56,7 @@ public class GodotEditText extends EditText {
 	// Fields
 	// ===========================================================
 	private GodotView mView;
+	private View mKeyboardView;
 	private GodotTextInputWrapper mInputWrapper;
 	private EditHandler sHandler = new EditHandler(this);
 	private String mOriginText;
@@ -117,7 +119,7 @@ public class GodotEditText extends EditText {
 
 					edit.mInputWrapper.setOriginText(text);
 					edit.addTextChangedListener(edit.mInputWrapper);
-					final InputMethodManager imm = (InputMethodManager)mView.getContext().getSystemService(Context.INPUT_METHOD_SERVICE);
+					final InputMethodManager imm = (InputMethodManager)mKeyboardView.getContext().getSystemService(Context.INPUT_METHOD_SERVICE);
 					imm.showSoftInput(edit, 0);
 				}
 			} break;
@@ -126,7 +128,7 @@ public class GodotEditText extends EditText {
 				GodotEditText edit = (GodotEditText)msg.obj;
 
 				edit.removeTextChangedListener(mInputWrapper);
-				final InputMethodManager imm = (InputMethodManager)mView.getContext().getSystemService(Context.INPUT_METHOD_SERVICE);
+				final InputMethodManager imm = (InputMethodManager)mKeyboardView.getContext().getSystemService(Context.INPUT_METHOD_SERVICE);
 				imm.hideSoftInputFromWindow(edit.getWindowToken(), 0);
 				edit.mView.requestFocus();
 			} break;
@@ -150,6 +152,10 @@ public class GodotEditText extends EditText {
 		view.requestFocus();
 	}
 
+	public void setKeyboardView(final View keyboardView) {
+		this.mKeyboardView = keyboardView;
+	}
+
 	// ===========================================================
 	// Methods for/from SuperClass/Interfaces
 	// ===========================================================