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

@@ -70,6 +70,7 @@ 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.LayoutInflater;
 import android.view.MotionEvent;
@@ -82,6 +83,7 @@ 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;
 
@@ -163,6 +165,8 @@ public class Godot extends Fragment implements SensorEventListener, IDownloaderC
 	public GodotRenderView mRenderView;
 	private boolean godot_initialized = false;
 
+	private PopupWindow mKeyboardWindow;
+
 	private SensorManager mSensorManager;
 	private Sensor mAccelerometer;
 	private Sensor mGravity;
@@ -219,11 +223,23 @@ public class Godot extends Fragment implements SensorEventListener, IDownloaderC
 		containerLayout = new FrameLayout(activity);
 		containerLayout.setLayoutParams(new LayoutParams(LayoutParams.MATCH_PARENT, LayoutParams.MATCH_PARENT));
 
+		// 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(activity);
+		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(activity);
-		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);
-		containerLayout.addView(editText);
+		// ...add to keyboard layout
+		keyboardLayout.addView(editText);
 
 		GodotLib.setup(command_line);
 
@@ -240,13 +256,13 @@ public class Godot extends Fragment implements SensorEventListener, IDownloaderC
 		editText.setView(mRenderView);
 		io.setEdit(editText);
 
-		view.getViewTreeObserver().addOnGlobalLayoutListener(new ViewTreeObserver.OnGlobalLayoutListener() {
+		keyboardLayout.getViewTreeObserver().addOnGlobalLayoutListener(new ViewTreeObserver.OnGlobalLayoutListener() {
 			@Override
 			public void onGlobalLayout() {
 				Point fullSize = new Point();
 				activity.getWindowManager().getDefaultDisplay().getSize(fullSize);
 				Rect gameSize = new Rect();
-				mRenderView.getView().getWindowVisibleDisplayFrame(gameSize);
+				mKeyboardWindow.getContentView().getWindowVisibleDisplayFrame(gameSize);
 
 				final int keyboardHeight = fullSize.y - gameSize.bottom;
 				GodotLib.setVirtualKeyboardHeight(keyboardHeight);
@@ -603,8 +619,22 @@ public class Godot extends Fragment implements SensorEventListener, IDownloaderC
 		return containerLayout;
 	}
 
+	@Override
+	public void onStart() {
+		super.onStart();
+
+		mRenderView.getView().post(new Runnable() {
+			@Override
+			public void run() {
+				mKeyboardWindow.showAtLocation(getActivity().getWindow().getDecorView(), Gravity.NO_GRAVITY, 0, 0);
+			}
+		});
+	}
+
 	@Override
 	public void onDestroy() {
+		mKeyboardWindow.dismiss();
+
 		for (GodotPlugin plugin : pluginRegistry.getAllPlugins()) {
 			plugin.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 GodotRenderView mRenderView;
+	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)mRenderView.getView().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)mRenderView.getView().getContext().getSystemService(Context.INPUT_METHOD_SERVICE);
+				final InputMethodManager imm = (InputMethodManager)mKeyboardView.getContext().getSystemService(Context.INPUT_METHOD_SERVICE);
 				imm.hideSoftInputFromWindow(edit.getWindowToken(), 0);
 				edit.mRenderView.getView().requestFocus();
 			} break;
@@ -150,6 +152,10 @@ public class GodotEditText extends EditText {
 		view.getView().requestFocus();
 	}
 
+	public void setKeyboardView(final View keyboardView) {
+		mKeyboardView = keyboardView;
+	}
+
 	// ===========================================================
 	// Methods for/from SuperClass/Interfaces
 	// ===========================================================