Add warning for MIUI users when trying to restore backups with MIUI Optimization disabled

app/src/main/java/eu/kanade/tachiyomi/util/system/MiuiUtil.kt

@@ -0,0 +1,38 @@
+package eu.kanade.tachiyomi.util.system
+
+import android.annotation.SuppressLint
+import timber.log.Timber
+
+object MiuiUtil {
+
+    fun isMiui(): Boolean {
+        return getSystemProperty("ro.miui.ui.version.name")?.isNotEmpty() ?: false
+    }
+
+    @SuppressLint("PrivateApi")
+    fun isMiuiOptimizationDisabled(): Boolean {
+        if ("0" == getSystemProperty("persist.sys.miui_optimization")) {
+            return true
+        }
+
+        return try {
+            Class.forName("android.miui.AppOpsUtils")
+                .getDeclaredMethod("isXOptMode")
+                .invoke(null) as Boolean
+        } catch (e: Exception) {
+            false
+        }
+    }
+
+    @SuppressLint("PrivateApi")
+    private fun getSystemProperty(key: String?): String? {
+        return try {
+            Class.forName("android.os.SystemProperties")
+                .getDeclaredMethod("get", String::class.java)
+                .invoke(null, key) as String
+        } catch (e: Exception) {
+            Timber.w(e, "Unable to use SystemProperties.get")
+            null
+        }
+    }
+}