android: Rework MemoryUtil

Uses string templates and rounds up memory amount for potentially inaccurate checks now

src/android/app/src/main/java/org/yuzu/yuzu_emu/activities/EmulationActivity.kt

@@ -47,6 +47,7 @@ import org.yuzu.yuzu_emu.utils.InputHandler
 import org.yuzu.yuzu_emu.utils.MemoryUtil
 import org.yuzu.yuzu_emu.utils.NfcReader
 import org.yuzu.yuzu_emu.utils.ThemeHelper
+import java.text.NumberFormat
 import kotlin.math.roundToInt
 
 class EmulationActivity : AppCompatActivity(), SensorEventListener {
@@ -106,13 +107,17 @@ class EmulationActivity : AppCompatActivity(), SensorEventListener {
         inputHandler = InputHandler()
         inputHandler.initialize()
 
-        if (MemoryUtil.isLessThan(8, MemoryUtil.Gb)) {
+        if (MemoryUtil.isLessThan(MemoryUtil.REQUIRED_MEMORY, MemoryUtil.Gb)) {
             Toast.makeText(
                 this,
                 getString(
                     R.string.device_memory_inadequate,
                     MemoryUtil.getDeviceRAM(),
-                    "8 ${getString(R.string.memory_gigabyte)}"
+                    getString(
+                        R.string.memory_formatted,
+                        NumberFormat.getInstance().format(MemoryUtil.REQUIRED_MEMORY),
+                        getString(R.string.memory_gigabyte)
+                    )
                 ),
                 Toast.LENGTH_LONG
             ).show()

src/android/app/src/main/java/org/yuzu/yuzu_emu/utils/MemoryUtil.kt

@@ -5,44 +5,101 @@ package org.yuzu.yuzu_emu.utils
 
 import android.app.ActivityManager
 import android.content.Context
+import android.os.Build
 import org.yuzu.yuzu_emu.R
 import org.yuzu.yuzu_emu.YuzuApplication
 import java.util.Locale
+import kotlin.math.ceil
 
 object MemoryUtil {
     private val context get() = YuzuApplication.appContext
 
-    private val Long.floatForm: String
+    private val Float.hundredths: String
-        get() = String.format(Locale.ROOT, "%.2f", this.toDouble())
+        get() = String.format(Locale.ROOT, "%.2f", this)
 
-    const val Kb: Long = 1024
+    // Required total system memory
+    const val REQUIRED_MEMORY = 8
+
+    const val Kb: Float = 1024F
     const val Mb = Kb * 1024
     const val Gb = Mb * 1024
     const val Tb = Gb * 1024
     const val Pb = Tb * 1024
     const val Eb = Pb * 1024
 
-    private fun bytesToSizeUnit(size: Long): String {
+    private fun bytesToSizeUnit(size: Float): String =
-        return when {
+        when {
-            size < Kb -> "${size.floatForm} ${context.getString(R.string.memory_byte)}"
+            size < Kb -> {
-            size < Mb -> "${(size / Kb).floatForm} ${context.getString(R.string.memory_kilobyte)}"
+                context.getString(
-            size < Gb -> "${(size / Mb).floatForm} ${context.getString(R.string.memory_megabyte)}"
+                    R.string.memory_formatted,
-            size < Tb -> "${(size / Gb).floatForm} ${context.getString(R.string.memory_gigabyte)}"
+                    size.hundredths,
-            size < Pb -> "${(size / Tb).floatForm} ${context.getString(R.string.memory_terabyte)}"
+                    context.getString(R.string.memory_byte)
-            size < Eb -> "${(size / Pb).floatForm} ${context.getString(R.string.memory_petabyte)}"
+                )
-            else -> "${(size / Eb).floatForm} ${context.getString(R.string.memory_exabyte)}"
+            }
+            size < Mb -> {
+                context.getString(
+                    R.string.memory_formatted,
+                    (size / Kb).hundredths,
+                    context.getString(R.string.memory_kilobyte)
+                )
+            }
+            size < Gb -> {
+                context.getString(
+                    R.string.memory_formatted,
+                    (size / Mb).hundredths,
+                    context.getString(R.string.memory_megabyte)
+                )
+            }
+            size < Tb -> {
+                context.getString(
+                    R.string.memory_formatted,
+                    (size / Gb).hundredths,
+                    context.getString(R.string.memory_gigabyte)
+                )
+            }
+            size < Pb -> {
+                context.getString(
+                    R.string.memory_formatted,
+                    (size / Tb).hundredths,
+                    context.getString(R.string.memory_terabyte)
+                )
+            }
+            size < Eb -> {
+                context.getString(
+                    R.string.memory_formatted,
+                    (size / Pb).hundredths,
+                    context.getString(R.string.memory_petabyte)
+                )
+            }
+            else -> {
+                context.getString(
+                    R.string.memory_formatted,
+                    (size / Eb).hundredths,
+                    context.getString(R.string.memory_exabyte)
+                )
             }
         }
 
-    private val totalMemory =
+    // Devices are unlikely to have 0.5GB increments of memory so we'll just round up to account for
-        with(context.getSystemService(Context.ACTIVITY_SERVICE) as ActivityManager) {
+    // the potential error created by memInfo.totalMem
+    private val totalMemory: Float
+        get() {
             val memInfo = ActivityManager.MemoryInfo()
+            with(context.getSystemService(Context.ACTIVITY_SERVICE) as ActivityManager) {
                 getMemoryInfo(memInfo)
-            memInfo.totalMem
             }
 
-    fun isLessThan(minimum: Int, size: Long): Boolean {
+            return ceil(
-        return when (size) {
+                if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.UPSIDE_DOWN_CAKE) {
+                    memInfo.advertisedMem.toFloat()
+                } else {
+                    memInfo.totalMem.toFloat()
+                }
+            )
+        }
+
+    fun isLessThan(minimum: Int, size: Float): Boolean =
+        when (size) {
             Kb -> totalMemory < Mb && totalMemory < minimum
             Mb -> totalMemory < Gb && (totalMemory / Mb) < minimum
             Gb -> totalMemory < Tb && (totalMemory / Gb) < minimum
@@ -51,9 +108,6 @@ object MemoryUtil {
             Eb -> totalMemory / Eb < minimum
             else -> totalMemory < Kb && totalMemory < minimum
         }
-    }
 
-    fun getDeviceRAM(): String {
+    fun getDeviceRAM(): String = bytesToSizeUnit(totalMemory)
-        return bytesToSizeUnit(totalMemory)
-    }
 }

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

@@ -273,6 +273,7 @@
     <string name="fatal_error_message">A fatal error occurred. Check the log for details.\nContinuing emulation may result in crashes and bugs.</string>
     <string name="performance_warning">Turning off this setting will significantly reduce emulation performance! For the best experience, it is recommended that you leave this setting enabled.</string>
     <string name="device_memory_inadequate">Device RAM: %1$s\nRecommended: %2$s</string>
+    <string name="memory_formatted">%1$s %2$s</string>
 
     <!-- Region Names -->
     <string name="region_japan">Japan</string>