Android: Use OpenDocument for NFC figures and fix crash (Fixes #13956)

- Switch from ActivityResultContracts.GetContent() to OpenDocument()
  which restores ACTION_OPEN_DOCUMENT behavior, granting write access
  to file descriptors opened in C++ via ContentHandler.openFd().
- Replace unsafe force-unwraps (!!) in EmulationActivity with null checks.

Source/Android/app/src/main/java/org/dolphinemu/dolphinemu/activities/EmulationActivity.kt

@@ -43,6 +43,7 @@ import org.dolphinemu.dolphinemu.features.infinitybase.ui.FigureSlotAdapter
 import org.dolphinemu.dolphinemu.features.input.model.ControllerInterface
 import org.dolphinemu.dolphinemu.features.input.model.DolphinSensorEventListener
 import org.dolphinemu.dolphinemu.features.settings.model.BooleanSetting
+import org.dolphinemu.dolphinemu.utils.ContentHandler
 import org.dolphinemu.dolphinemu.features.settings.model.IntSetting
 import org.dolphinemu.dolphinemu.features.settings.model.Settings
 import org.dolphinemu.dolphinemu.features.settings.model.StringSetting
@@ -104,17 +105,21 @@ class EmulationActivity : AppCompatActivity(), ThemeProvider {
     }
 
     val requestSkylanderFile = registerForActivityResult(
-        ActivityResultContracts.GetContent()
+        ActivityResultContracts.OpenDocument()
     ) { uri: Uri? ->
         if (uri != null) {
             val slot = SkylanderConfig.loadSkylander(
                 skylanderSlots[skylanderSlot].portalSlot,
                 uri.toString()
-            )!!
-            clearSkylander(skylanderSlot)
-            skylanderSlots[skylanderSlot].portalSlot = slot.first!!
-            skylanderSlots[skylanderSlot].label = slot.second!!
-            skylandersBinding.figureManager.adapter!!.notifyItemChanged(skylanderSlot)
+            )
+            if (slot != null && slot.first != null && slot.second != null) {
+                clearSkylander(skylanderSlot)
+                skylanderSlots[skylanderSlot].portalSlot = slot.first!!
+                skylanderSlots[skylanderSlot].label = slot.second!!
+                skylandersBinding.figureManager.adapter?.notifyItemChanged(skylanderSlot)
+            } else {
+                Toast.makeText(this, R.string.skylander_load_failed, Toast.LENGTH_SHORT).show()
+            }
             skylanderSlot = -1
             skylanderData = Skylander.BLANK_SKYLANDER
         }
@@ -131,10 +136,12 @@ class EmulationActivity : AppCompatActivity(), ThemeProvider {
                     uri.toString(),
                     skylanderSlots[skylanderSlot].portalSlot
                 )
-                clearSkylander(skylanderSlot)
-                skylanderSlots[skylanderSlot].portalSlot = slot.first
-                skylanderSlots[skylanderSlot].label = slot.second
-                skylandersBinding.figureManager.adapter?.notifyItemChanged(skylanderSlot)
+                if (slot.first != -1) {
+                    clearSkylander(skylanderSlot)
+                    skylanderSlots[skylanderSlot].portalSlot = slot.first
+                    skylanderSlots[skylanderSlot].label = slot.second
+                    skylandersBinding.figureManager.adapter?.notifyItemChanged(skylanderSlot)
+                }
                 skylanderSlot = -1
                 skylanderData = Skylander.BLANK_SKYLANDER
             }
@@ -142,7 +149,7 @@ class EmulationActivity : AppCompatActivity(), ThemeProvider {
     }
 
     val requestInfinityFigureFile = registerForActivityResult(
-        ActivityResultContracts.GetContent()
+        ActivityResultContracts.OpenDocument()
     ) { uri: Uri? ->
         if (uri != null) {
             val label = InfinityConfig.loadFigure(infinityPosition, uri.toString())

Source/Android/app/src/main/java/org/dolphinemu/dolphinemu/features/infinitybase/ui/FigureSlotAdapter.kt

@@ -51,7 +51,7 @@ class FigureSlotAdapter(
 
         holder.binding.buttonLoadFigure.setOnClickListener {
             activity.setInfinityFigureData(0, "", figure.position, position)
-            activity.requestInfinityFigureFile.launch("*/*")
+            activity.requestInfinityFigureFile.launch(arrayOf("*/*"))
         }
 
         val inflater = LayoutInflater.from(activity)

Source/Android/app/src/main/java/org/dolphinemu/dolphinemu/features/skylanders/ui/SkylanderSlotAdapter.kt

@@ -47,7 +47,7 @@ class SkylanderSlotAdapter(
 
         holder.binding.buttonLoadFigure.setOnClickListener {
             activity.setSkylanderData(0, 0, "", position)
-            activity.requestSkylanderFile.launch("*/*")
+            activity.requestSkylanderFile.launch(arrayOf("*/*"))
         }
 
         val inflater = LayoutInflater.from(activity)

Source/Android/app/src/main/res/values/strings.xml

@@ -956,6 +956,7 @@ It can efficiently compress both junk data and encrypted Wii data.
     <string name="skylander_id">ID</string>
     <string name="skylander_variant">Variant</string>
     <string name="invalid_skylander">Invalid Skylander Selection</string>
+    <string name="skylander_load_failed">Failed to load Skylander figure</string>
 
     <string name="emulate_infinity_base">Infinity Base</string>
     <string name="infinity_manager">Infinity Manager</string>