feat(android): present pageSheet/formSheet as a partial custom tab (bottom sheet)

android/src/main/java/com/nitroinappbrowser/NitroInAppBrowserImpl.kt

@@ -8,6 +8,7 @@ import androidx.browser.customtabs.CustomTabsIntent
 import com.facebook.react.bridge.ReactApplicationContext
 import com.margelo.nitro.core.Promise
 import com.margelo.nitro.nitroinappbrowser.NitroInAppBrowserOptions
+import com.margelo.nitro.nitroinappbrowser.NitroInAppBrowserPresentationStyle
 import androidx.core.graphics.toColorInt
 import androidx.core.net.toUri
 
@@ -33,22 +34,45 @@ class NitroInAppBrowserImpl(private val reactContext: ReactApplicationContext?)
             customTabParams.setNavigationBarColor(getColor(options.barColor))
         }
 
+        val currentActivity = reactContext?.currentActivity ?: throw Error("No Activity")
+
         val customTabIntent = CustomTabsIntent.Builder()
         customTabIntent.setShowTitle(false)
         customTabIntent.setInstantAppsEnabled(false)
         customTabIntent.setDefaultColorSchemeParams(customTabParams.build())
         customTabIntent.setShareState(CustomTabsIntent.SHARE_STATE_ON)
 
-        val intent = customTabIntent.build()
-        intent.apply {
-            if (!isPackageInstalled()){
-                Log.d(TAG, "Chrome not installed")
-            } else {
-                intent.intent.setPackage(chromePackageName)
+        // pageSheet/formSheet -> partial custom tab (bottom sheet), like iOS;
+        // fullScreen/unset stay full-screen. Height = display minus a fixed top-gap
+        // peek; Chrome clamps the minimum to 50% and the user can drag to full.
+        when (options?.presentationStyle) {
+            NitroInAppBrowserPresentationStyle.PAGESHEET,
+            NitroInAppBrowserPresentationStyle.FORMSHEET -> {
+                val metrics = currentActivity.resources.displayMetrics
+                val topGapPx = (TOP_GAP_DP * metrics.density).toInt()
+                customTabIntent.setInitialActivityHeightPx(
+                    metrics.heightPixels - topGapPx,
+                    CustomTabsIntent.ACTIVITY_HEIGHT_ADJUSTABLE,
+                )
+                customTabIntent.setToolbarCornerRadiusDp(TOOLBAR_CORNER_RADIUS_DP)
             }
+            else -> Unit
         }
-        val currentActivity = reactContext?.currentActivity ?: throw Error("No Activity")
-        intent.launchUrl(currentActivity, url.toUri())
+
+        val intent = customTabIntent.build()
+        if (!isPackageInstalled()) {
+            Log.d(TAG, "Chrome not installed")
+        } else {
+            intent.intent.setPackage(chromePackageName)
+        }
+        // Partial tabs are only honored when launched via startActivityForResult
+        // (or a CustomTabsSession); launchUrl() silently ignores the height.
+        intent.intent.data = url.toUri()
+        currentActivity.startActivityForResult(
+            intent.intent,
+            IN_APP_BROWSER_REQUEST_CODE,
+            intent.startAnimationBundle,
+        )
         return Promise.resolved(Unit)
     }
 
@@ -76,5 +100,13 @@ class NitroInAppBrowserImpl(private val reactContext: ReactApplicationContext?)
 
     companion object {
         const val TAG = "NitroInAppBrowserImpl"
+        // Fixed top peek (dp) subtracted from the display height for the sheet's
+        // initial height — a constant gap across screen sizes, like iOS pageSheet.
+        private const val TOP_GAP_DP = 80f
+        // Arbitrary request code: startActivityForResult is required for Chrome to
+        // honor the partial-tab height; we don't consume the result.
+        private const val IN_APP_BROWSER_REQUEST_CODE = 0x1A0B
+        // System clamps the toolbar corner radius at 16dp.
+        private const val TOOLBAR_CORNER_RADIUS_DP = 16
     }
 }