Make settings page more reasonable

app/src/main/java/com/topjohnwu/magisk/ui/base/CompatHelpers.kt

@@ -10,10 +10,14 @@ import me.tatarka.bindingcollectionadapter2.OnItemBind
 
 inline fun <T : ComparableRvItem<*>> diffListOf(
     vararg newItems: T
+) = diffListOf(newItems.toList())
+
+inline fun <T : ComparableRvItem<*>> diffListOf(
+    newItems: List<T>
 ) = DiffObservableList(object : DiffObservableList.Callback<T> {
     override fun areItemsTheSame(oldItem: T, newItem: T) = oldItem.genericItemSameAs(newItem)
     override fun areContentsTheSame(oldItem: T, newItem: T) = oldItem.genericContentSameAs(newItem)
-}).also { it.update(newItems.toList()) }
+}).also { it.update(newItems) }
 
 inline fun <T : ComparableRvItem<*>> filterableListOf(
     vararg newItems: T

app/src/main/java/com/topjohnwu/magisk/ui/settings/SettingsItems.kt

@@ -91,10 +91,6 @@ object Hide : SettingsItem.Input() {
 
     override fun getView(context: Context) = DialogSettingsAppNameBinding
         .inflate(LayoutInflater.from(context)).also { it.data = this }.root
-
-    override fun refresh() {
-        isEnabled = Info.env.isActive
-    }
 }
 
 object Restore : SettingsItem.Blank() {
@@ -183,10 +179,6 @@ object UpdateChecker : SettingsItem.Toggle() {
 object SystemlessHosts : SettingsItem.Blank() {
     override val title = R.string.settings_hosts_title.asTransitive()
     override val description = R.string.settings_hosts_summary.asTransitive()
-
-    override fun refresh() {
-        isEnabled = Info.env.isActive
-    }
 }
 
 object Biometrics : SettingsItem.Toggle() {
@@ -195,7 +187,7 @@ object Biometrics : SettingsItem.Toggle() {
     override var description = R.string.settings_su_biometric_summary.asTransitive()
 
     override fun refresh() {
-        isEnabled = BiometricHelper.isSupported && Utils.showSuperUser()
+        isEnabled = BiometricHelper.isSupported
         if (!isEnabled) {
             value = false
             description = R.string.no_biometric.asTransitive()
@@ -232,10 +224,6 @@ object SafeMode : SettingsItem.Toggle() {
         }
         Utils.toast(R.string.settings_reboot_toast, Toast.LENGTH_LONG)
     }
-
-    override fun refresh() {
-        isEnabled = Info.env.isActive
-    }
 }
 
 object MagiskHide : SettingsItem.Toggle() {
@@ -248,10 +236,6 @@ object MagiskHide : SettingsItem.Toggle() {
             else -> Shell.su("magiskhide --disable").submit()
         }
     }
-
-    override fun refresh() {
-        isEnabled = Info.env.isActive
-    }
 }
 
 // --- Superuser
@@ -268,10 +252,6 @@ object AccessMode : SettingsItem.Selector() {
     override var value by bindableValue(Config.rootMode) {
         Config.rootMode = entryValues[it].toInt()
     }
-
-    override fun refresh() {
-        isEnabled = Utils.showSuperUser()
-    }
 }
 
 object MultiuserMode : SettingsItem.Selector() {
@@ -288,7 +268,7 @@ object MultiuserMode : SettingsItem.Selector() {
         get() = descArray[value].asTransitive()
 
     override fun refresh() {
-        isEnabled = Const.USER_ID <= 0 && Utils.showSuperUser()
+        isEnabled = Const.USER_ID == 0
     }
 }
 
@@ -304,10 +284,6 @@ object MountNamespaceMode : SettingsItem.Selector() {
 
     override val description
         get() = descArray[value].asTransitive()
-
-    override fun refresh() {
-        isEnabled = Utils.showSuperUser()
-    }
 }
 
 object AutomaticResponse : SettingsItem.Selector() {
@@ -318,10 +294,6 @@ object AutomaticResponse : SettingsItem.Selector() {
     override var value by bindableValue(Config.suAutoReponse) {
         Config.suAutoReponse = entryValues[it].toInt()
     }
-
-    override fun refresh() {
-        isEnabled = Utils.showSuperUser()
-    }
 }
 
 object RequestTimeout : SettingsItem.Selector() {
@@ -335,10 +307,6 @@ object RequestTimeout : SettingsItem.Selector() {
 
     private val selected: Int
         get() = entryValues.indexOfFirst { it.toInt() == Config.suDefaultTimeout }
-
-    override fun refresh() {
-        isEnabled = Utils.showSuperUser()
-    }
 }
 
 object SUNotification : SettingsItem.Selector() {
@@ -349,8 +317,4 @@ object SUNotification : SettingsItem.Selector() {
     override var value by bindableValue(Config.suNotification) {
         Config.suNotification = entryValues[it].toInt()
     }
-
-    override fun refresh() {
-        isEnabled = Utils.showSuperUser()
-    }
 }

app/src/main/java/com/topjohnwu/magisk/ui/settings/SettingsViewModel.kt

@@ -1,12 +1,16 @@
 package com.topjohnwu.magisk.ui.settings
 
 import android.Manifest
+import android.os.Build
 import android.view.View
 import android.widget.Toast
 import com.topjohnwu.magisk.BR
 import com.topjohnwu.magisk.R
+import com.topjohnwu.magisk.core.Const
+import com.topjohnwu.magisk.core.Info
 import com.topjohnwu.magisk.core.download.DownloadService
 import com.topjohnwu.magisk.core.utils.PatchAPK
+import com.topjohnwu.magisk.core.utils.Utils
 import com.topjohnwu.magisk.data.database.RepoDao
 import com.topjohnwu.magisk.extensions.subscribeK
 import com.topjohnwu.magisk.model.entity.internal.Configuration
@@ -20,7 +24,6 @@ import com.topjohnwu.magisk.ui.base.BaseViewModel
 import com.topjohnwu.magisk.ui.base.adapterOf
 import com.topjohnwu.magisk.ui.base.diffListOf
 import com.topjohnwu.magisk.ui.base.itemBindingOf
-import com.topjohnwu.magisk.core.utils.Utils
 import com.topjohnwu.superuser.Shell
 import io.reactivex.Completable
 import io.reactivex.subjects.PublishSubject
@@ -32,21 +35,58 @@ class SettingsViewModel(
 
     val adapter = adapterOf<SettingsItem>()
     val itemBinding = itemBindingOf<SettingsItem> { it.bindExtra(BR.callback, this) }
-    val items = diffListOf(
-        Customization,
-        Theme, Language, DownloadPath, GridSize,
+    val items = diffListOf(createItems())
 
-        Manager,
-        UpdateChannel, UpdateChannelUrl, ClearRepoCache, HideOrRestore(), UpdateChecker,
-        Biometrics, Reauthenticate,
+    private fun createItems(): List<SettingsItem> {
+        // Customization
+        val list = mutableListOf(
+            Customization,
+            Theme, Language, GridSize
+        )
+        if (Build.VERSION.SDK_INT < 21) {
+            // Pre 5.0 does not support getting colors from attributes,
+            // making theming a pain in the ass. Just forget about it
+            list.remove(Theme)
+        }
 
-        Magisk,
-        SafeMode, MagiskHide, SystemlessHosts,
+        // Manager
+        list.addAll(listOf(
+            Manager,
+            UpdateChannel, UpdateChannelUrl, UpdateChecker, DownloadPath
+        ))
+        if (Info.env.isActive) {
+            list.add(ClearRepoCache)
+            if (Const.USER_ID == 0 && Info.isConnected.value)
+                list.add(HideOrRestore())
+        }
 
-        Superuser,
-        AccessMode, MultiuserMode, MountNamespaceMode, AutomaticResponse, RequestTimeout,
-        SUNotification
-    )
+        // Magisk
+        if (Info.env.isActive) {
+            list.addAll(listOf(
+                Magisk,
+                MagiskHide, SystemlessHosts, SafeMode
+            ))
+        }
+
+        // Superuser
+        if (Utils.showSuperUser()) {
+            list.addAll(listOf(
+                Superuser,
+                Biometrics, AccessMode, MultiuserMode, MountNamespaceMode,
+                AutomaticResponse, RequestTimeout, SUNotification
+            ))
+            if (Build.VERSION.SDK_INT < 23) {
+                // Biometric is only available on 6.0+
+                list.remove(Biometrics)
+            }
+            if (Build.VERSION.SDK_INT < 26) {
+                // Re-authenticate is not feasible on 8.0+
+                list.add(Reauthenticate)
+            }
+        }
+
+        return list
+    }
 
     override fun onItemPressed(view: View, item: SettingsItem) = when (item) {
         is DownloadPath -> requireRWPermission()