open drawer when swiping

src/pandroid/app/src/main/java/com/panda3ds/pandroid/app/GameActivity.java

@@ -2,6 +2,7 @@
 
 import android.content.Intent;
 import android.os.Bundle;
+import android.view.GestureDetector;
 import android.view.KeyEvent;
 import android.view.MotionEvent;
 import android.view.View;
@@ -25,6 +26,7 @@
 public class GameActivity extends BaseActivity {
 	private final DrawerFragment drawerFragment = new DrawerFragment();
 	private final AlberInputListener inputListener = new AlberInputListener(this::onBackPressed);
+	private GestureDetector gestureDetector;
 
 	@Override
 	protected void onCreate(@Nullable Bundle savedInstanceState) {
@@ -58,6 +60,28 @@ protected void onCreate(@Nullable Bundle savedInstanceState) {
 		getSupportFragmentManager().beginTransaction().replace(R.id.drawer_fragment, drawerFragment).commitNow();
 	}
 
+	// Initialize gesture detector
+	@Override
+         public boolean onFling(MotionEvent e1, MotionEvent e2, float velocityX, float velocityY) {
+           float distanceX = e2.getX() - e1.getX();
+           float distanceY = e2.getY() - e1.getY();
+        if (Math.abs(distanceX) > Math.abs(distanceY) && distanceX > 0) {
+        //// Open the drawer when swiping from left to right
+        if (drawerFragment.isOpened()) {
+        } else {
+            drawerFragment.open();
+        }
+        return true;
+    }
+    return false;
+}
+
+	@Override
+        public boolean dispatchTouchEvent(MotionEvent ev) {
+        gestureDetector.onTouchEvent(ev);
+        return super.dispatchTouchEvent(ev);
+    }
+
 	@Override
 	protected void onResume() {
 		super.onResume();