[MOBILE-3656] Fix adjustResize when ignoring safe areas (#1243)

* Fix adjustResize when ignoring safe areas

* spots

Author: jyaganeh

urbanairship-layout/src/main/java/com/urbanairship/android/layout/ui/ModalActivity.kt

@@ -28,6 +28,7 @@ import com.urbanairship.android.layout.property.ModalPlacement
 import com.urbanairship.android.layout.property.Orientation
 import com.urbanairship.android.layout.reporting.DisplayTimer
 import com.urbanairship.android.layout.reporting.LayoutData
+import com.urbanairship.android.layout.util.FullScreenAdjustResizeWorkaround.Companion.applyAdjustResizeWorkaround
 import com.urbanairship.android.layout.util.parcelableExtra
 import com.urbanairship.android.layout.view.ModalView
 import kotlinx.coroutines.flow.Flow
@@ -115,6 +116,13 @@ public class ModalActivity : AppCompatActivity() {
             }
 
             setContentView(view)
+
+            if (placement.shouldIgnoreSafeArea()) {
+                // Apply workaround for adjustResize not working with fullscreen activities,
+                // so that the keyboard does not cover the modal when we're ignoring safe areas.
+                // ref: https://issuetracker.google.com/issues/36911528
+                applyAdjustResizeWorkaround()
+            }
         } catch (e: LoadException) {
             Logger.error(e, "Failed to load model!")
             finish()

urbanairship-layout/src/main/java/com/urbanairship/android/layout/util/FullScreenAdjustResizeWorkaround.kt

@@ -0,0 +1,55 @@
+package com.urbanairship.android.layout.util
+
+import android.app.Activity
+import android.graphics.Rect
+import android.view.View
+import android.widget.FrameLayout
+
+/**
+ * Allows a view to be resized when the keyboard is shown, even when the activity is in fullscreen.
+ *
+ * Workaround for this "won't fix" bug: https://issuetracker.google.com/issues/36911528
+ */
+internal class FullScreenAdjustResizeWorkaround private constructor(activity: Activity) {
+
+    private val child: View
+    private var previousUsableHeight: Int = 0
+    private val layoutParams: FrameLayout.LayoutParams
+
+    init {
+        val content = activity.findViewById<FrameLayout>(android.R.id.content)
+        child = content.getChildAt(0)
+        child.viewTreeObserver.addOnGlobalLayoutListener {
+            adjustResizeIfNeeded()
+        }
+        layoutParams = child.layoutParams as FrameLayout.LayoutParams
+    }
+
+    private fun adjustResizeIfNeeded() {
+        val usableHeight = getUsableHeight()
+        if (usableHeight != previousUsableHeight) {
+            val usableHeightMinusKeyboard = child.rootView.height
+            val heightDelta = usableHeightMinusKeyboard - usableHeight
+            if (heightDelta > (usableHeightMinusKeyboard / 4)) {
+                // keyboard probably just became visible
+                layoutParams.height = usableHeightMinusKeyboard - heightDelta
+            } else {
+                // keyboard probably just dismissed
+                layoutParams.height = usableHeightMinusKeyboard
+            }
+            child.requestLayout()
+            previousUsableHeight = usableHeight
+        }
+    }
+
+    private fun getUsableHeight(): Int {
+        val rect = Rect().apply { child.getWindowVisibleDisplayFrame(this) }
+        return rect.bottom - rect.top
+    }
+
+    internal companion object {
+        fun Activity.applyAdjustResizeWorkaround() {
+            FullScreenAdjustResizeWorkaround(this)
+        }
+    }
+}