Show battery optimization hint

app/src/main/AndroidManifest.xml

@@ -4,6 +4,15 @@
 
     <uses-permission android:name="android.permission.INTERNET" />
     <uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
+    <uses-permission android:name="android.permission.REQUEST_IGNORE_BATTERY_OPTIMIZATIONS" />
+
+    <queries>
+        <intent>
+            <action android:name="android.intent.action.VIEW" />
+
+            <category android:name="android.intent.category.BROWSABLE" />
+        </intent>
+    </queries>
 
     <application
         android:name=".App"

app/src/main/java/org/xtimms/tokusho/sections/settings/SettingsView.kt

@@ -1,20 +1,39 @@
 package org.xtimms.tokusho.sections.settings
 
+import android.annotation.SuppressLint
+import android.content.Context
+import android.content.Intent
+import android.content.pm.PackageManager
+import android.net.Uri
+import android.os.Build
+import android.os.PowerManager
+import android.provider.Settings
+import androidx.activity.compose.rememberLauncherForActivityResult
+import androidx.activity.result.contract.ActivityResultContracts
+import androidx.compose.animation.AnimatedVisibility
+import androidx.compose.animation.fadeOut
+import androidx.compose.animation.shrinkVertically
 import androidx.compose.foundation.layout.padding
 import androidx.compose.foundation.lazy.LazyColumn
 import androidx.compose.material.icons.Icons
+import androidx.compose.material.icons.outlined.BatterySaver
 import androidx.compose.material.icons.outlined.Code
 import androidx.compose.material.icons.outlined.Info
 import androidx.compose.material.icons.outlined.Palette
 import androidx.compose.material.icons.outlined.Storage
 import androidx.compose.runtime.Composable
 import androidx.compose.runtime.getValue
+import androidx.compose.runtime.mutableStateOf
+import androidx.compose.runtime.remember
+import androidx.compose.runtime.setValue
 import androidx.compose.ui.Modifier
 import androidx.compose.ui.platform.LocalContext
 import androidx.compose.ui.res.stringResource
 import androidx.hilt.navigation.compose.hiltViewModel
 import androidx.lifecycle.compose.collectAsStateWithLifecycle
 import org.xtimms.tokusho.R
+import org.xtimms.tokusho.core.components.PreferenceSubtitle
+import org.xtimms.tokusho.core.components.PreferencesHintCard
 import org.xtimms.tokusho.core.components.ScaffoldWithTopAppBar
 import org.xtimms.tokusho.core.components.SettingItem
 import org.xtimms.tokusho.sections.settings.storage.StorageViewModel
@@ -22,6 +41,7 @@ import org.xtimms.tokusho.utils.FileSize
 
 const val SETTINGS_DESTINATION = "settings"
 
+@SuppressLint("BatteryLife")
 @Composable
 fun SettingsView(
     navigateBack: () -> Unit,
@@ -35,6 +55,31 @@ fun SettingsView(
     val viewModel: StorageViewModel = hiltViewModel()
     val uiState by viewModel.uiState.collectAsStateWithLifecycle()
 
+    val pm = context.getSystemService(Context.POWER_SERVICE) as PowerManager
+    var showBatteryHint by remember {
+        mutableStateOf(!pm.isIgnoringBatteryOptimizations(context.packageName))
+    }
+
+    val intent =
+        Intent(Settings.ACTION_REQUEST_IGNORE_BATTERY_OPTIMIZATIONS).apply {
+            data = Uri.parse("package:${context.packageName}")
+        }
+
+    val isActivityAvailable: Boolean =
+        if (Build.VERSION.SDK_INT < 33) context.packageManager.queryIntentActivities(
+            intent,
+            PackageManager.MATCH_ALL
+        ).isNotEmpty()
+        else context.packageManager.queryIntentActivities(
+            intent,
+            PackageManager.ResolveInfoFlags.of(PackageManager.MATCH_SYSTEM_ONLY.toLong())
+        ).isNotEmpty()
+
+    val launcher =
+        rememberLauncherForActivityResult(ActivityResultContracts.StartActivityForResult()) {
+            showBatteryHint = !pm.isIgnoringBatteryOptimizations(context.packageName)
+        }
+
     ScaffoldWithTopAppBar(
         title = stringResource(R.string.settings),
         navigateBack = navigateBack
@@ -43,6 +88,22 @@ fun SettingsView(
             modifier = Modifier
                 .padding(padding)
         ) {
+            item {
+                AnimatedVisibility(
+                    visible = showBatteryHint && isActivityAvailable,
+                    exit = shrinkVertically() + fadeOut()
+                ) {
+                    PreferencesHintCard(
+                        title = stringResource(R.string.disable_battery_optimization),
+                        icon = Icons.Outlined.BatterySaver,
+                        description = stringResource(R.string.disable_battery_optimization_summary),
+                    ) {
+                        launcher.launch(intent)
+                        showBatteryHint =
+                            !pm.isIgnoringBatteryOptimizations(context.packageName)
+                    }
+                }
+            }
             item {
                 SettingItem(
                     title = stringResource(id = R.string.appearance),
@@ -52,13 +113,12 @@ fun SettingsView(
                 )
             }
             item {
-                val allCaches = uiState.availableSpace +
+                val allCaches = uiState.httpCacheSize +
-                        uiState.httpCacheSize +
                         uiState.pagesCache +
                         uiState.thumbnailsCache
                 val desc = buildString {
-                    append((uiState.availableSpace / allCaches) * 100)
+                    append((allCaches / uiState.availableSpace) * 100)
-                    append("% used")
+                    append(context.getString(R.string.space_used))
                     append(" - ")
                     append(
                         FileSize.BYTES.freeFormat(

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

@@ -95,4 +95,8 @@
     <string name="text_file_sizes_free">B free|kB free|MB free|GB free|TB free</string>
     <string name="confirm">Confirm</string>
     <string name="free_up_space_summary">Space can be cleared:</string>
+    <string name="disable_battery_optimization">Disable battery optimization</string>
+    <string name="disable_battery_optimization_summary">Helps with background updates checks</string>
+    <string name="recommended_action">Recommended action</string>
+    <string name="space_used">% used</string>
 </resources>