fix(battery_plus): Improve battery save mode check on Xiaomi devices

packages/battery_plus/battery_plus/android/build.gradle

@@ -38,7 +38,7 @@ android {
     }
 
     defaultConfig {
-        minSdk 19
+        minSdk 21
         testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner"
     }
 

packages/battery_plus/battery_plus/android/src/main/kotlin/dev/fluttercommunity/plus/battery/BatteryPlusPlugin.kt

@@ -20,7 +20,6 @@ import android.os.Build
 import java.util.Locale
 import android.os.PowerManager
 import android.provider.Settings
-import androidx.annotation.RequiresApi
 import androidx.core.content.ContextCompat
 import androidx.core.content.ContextCompat.RECEIVER_NOT_EXPORTED
 
@@ -51,7 +50,8 @@ class BatteryPlusPlugin : MethodCallHandler, EventChannel.StreamHandler, Flutter
     override fun onMethodCall(call: MethodCall, result: MethodChannel.Result) {
         when (call.method) {
             "getBatteryLevel" -> {
-                val currentBatteryLevel = getBatteryLevel()
+                val currentBatteryLevel =
+                    getBatteryProperty(BatteryManager.BATTERY_PROPERTY_CAPACITY)
                 if (currentBatteryLevel != -1) {
                     result.success(currentBatteryLevel)
                 } else {
@@ -103,78 +103,75 @@ class BatteryPlusPlugin : MethodCallHandler, EventChannel.StreamHandler, Flutter
         val status: Int = if (VERSION.SDK_INT >= VERSION_CODES.O) {
             getBatteryProperty(BatteryManager.BATTERY_PROPERTY_STATUS)
         } else {
-            val intent = ContextWrapper(applicationContext).registerReceiver(null, IntentFilter(Intent.ACTION_BATTERY_CHANGED))
+            val intent = ContextWrapper(applicationContext).registerReceiver(
+                null,
+                IntentFilter(Intent.ACTION_BATTERY_CHANGED)
+            )
             intent?.getIntExtra(BatteryManager.EXTRA_STATUS, -1) ?: -1
         }
         return convertBatteryStatus(status)
     }
 
-    private fun getBatteryLevel(): Int {
-        return if (VERSION.SDK_INT >= VERSION_CODES.LOLLIPOP) {
-            getBatteryProperty(BatteryManager.BATTERY_PROPERTY_CAPACITY)
-        } else {
-            val intent = ContextWrapper(applicationContext).registerReceiver(null, IntentFilter(Intent.ACTION_BATTERY_CHANGED))
-            val level = intent!!.getIntExtra(BatteryManager.EXTRA_LEVEL, -1)
-            val scale = intent.getIntExtra(BatteryManager.EXTRA_SCALE, -1)
-            (level * 100 / scale)
-        }
-    }
-
     private fun isInPowerSaveMode(): Boolean? {
         val deviceManufacturer = Build.MANUFACTURER.lowercase(Locale.getDefault())
 
-        return if (VERSION.SDK_INT >= VERSION_CODES.LOLLIPOP) {
-            when (deviceManufacturer) {
-                "xiaomi" -> isXiaomiPowerSaveModeActive()
-                "huawei" -> isHuaweiPowerSaveModeActive()
-                "samsung" -> isSamsungPowerSaveModeActive()
-                else -> checkPowerServiceSaveMode()
-            }
-        } else {
-            null
+        return when (deviceManufacturer) {
+            "xiaomi" -> isXiaomiPowerSaveModeActive()
+            "huawei" -> isHuaweiPowerSaveModeActive()
+            "samsung" -> isSamsungPowerSaveModeActive()
+            else -> checkPowerServiceSaveMode()
         }
     }
 
     private fun isSamsungPowerSaveModeActive(): Boolean {
-        val mode = Settings.System.getString(applicationContext!!.contentResolver, POWER_SAVE_MODE_SAMSUNG_NAME)
-        return if (mode == null && VERSION.SDK_INT >= VERSION_CODES.LOLLIPOP) {
+        val mode = Settings.System.getString(
+            applicationContext!!.contentResolver,
+            POWER_SAVE_MODE_SAMSUNG_NAME
+        )
+        return if (mode == null) {
             checkPowerServiceSaveMode()
         } else {
             mode == POWER_SAVE_MODE_SAMSUNG_VALUE
         }
     }
 
-    @RequiresApi(VERSION_CODES.LOLLIPOP)
     private fun isHuaweiPowerSaveModeActive(): Boolean {
-        val mode = Settings.System.getInt(applicationContext!!.contentResolver, POWER_SAVE_MODE_HUAWEI_NAME, -1)
+        val mode = Settings.System.getInt(
+            applicationContext!!.contentResolver,
+            POWER_SAVE_MODE_HUAWEI_NAME,
+            -1
+        )
         return if (mode != -1) {
             mode == POWER_SAVE_MODE_HUAWEI_VALUE
         } else {
             // On Devices like the P30 lite, we always get an -1 result code.
-            // Stackoverflow issue: https://stackoverflow.com/a/70500770
+            // StackOverflow issue: https://stackoverflow.com/a/70500770
             checkPowerServiceSaveMode()
         }
     }
 
-    private fun isXiaomiPowerSaveModeActive(): Boolean? {
-        val mode = Settings.System.getInt(applicationContext!!.contentResolver, POWER_SAVE_MODE_XIAOMI_NAME, -1)
+    private fun isXiaomiPowerSaveModeActive(): Boolean {
+        val mode = Settings.System.getInt(
+            applicationContext!!.contentResolver,
+            POWER_SAVE_MODE_XIAOMI_NAME,
+            -1
+        )
         return if (mode != -1) {
             mode == POWER_SAVE_MODE_XIAOMI_VALUE
         } else {
-            null
+            checkPowerServiceSaveMode()
         }
     }
 
-    @RequiresApi(api = VERSION_CODES.LOLLIPOP)
     private fun checkPowerServiceSaveMode(): Boolean {
         val powerManager =
             applicationContext!!.getSystemService(Context.POWER_SERVICE) as PowerManager
         return powerManager.isPowerSaveMode
     }
 
-    @RequiresApi(api = VERSION_CODES.LOLLIPOP)
     private fun getBatteryProperty(property: Int): Int {
-        val batteryManager = applicationContext!!.getSystemService(Context.BATTERY_SERVICE) as BatteryManager
+        val batteryManager =
+            applicationContext!!.getSystemService(Context.BATTERY_SERVICE) as BatteryManager
         return batteryManager.getIntProperty(property)
     }