How do I grant access to my android app to read the CPU temp files in the internal storage files? I have been trying to get this working for quite a while now and have not made any progress. Below I have included the current methods I have for accessing the CPU temp files. I have also included my AndroidManifest.xml file.
Error I am receiving when trying to read the CPU temp:
2023-03-03 23:21:12.178 5266-5266 System.err com.example.racestats W java.io.FileNotFoundException: /sys/devices/virtual/thermal/thermal_zone0/temp: open failed: EACCES (Permission denied)
2023-03-03 23:21:12.179 5266-5266 System.err com.example.racestats W at libcore.io.IoBridge.open(IoBridge.java:574)
2023-03-03 23:21:12.179 5266-5266 System.err com.example.racestats W at java.io.RandomAccessFile.<init>(RandomAccessFile.java:289)
2023-03-03 23:21:12.179 5266-5266 System.err com.example.racestats W at java.io.RandomAccessFile.<init>(RandomAccessFile.java:152)
2023-03-03 23:21:12.179 5266-5266 System.err com.example.racestats W at com.example.racestats.MainActivityKt.getCpuTemperature(MainActivity.kt:171)
2023-03-03 23:21:12.180 5266-5266 System.err com.example.racestats W at com.example.racestats.MainActivityKt.cpuTemperature$lambda$0(MainActivity.kt:157)
2023-03-03 23:21:12.180 5266-5266 System.err com.example.racestats W at com.example.racestats.MainActivityKt.$r8$lambda$vjQE1RADCplWY99vEEfe1Z4FocA(Unknown Source:0)
2023-03-03 23:21:12.180 5266-5266 System.err com.example.racestats W at com.example.racestats.MainActivityKt$$ExternalSyntheticLambda0.onClick(Unknown Source:4)
2023-03-03 23:21:12.180 5266-5266 System.err com.example.racestats W at com.android.internal.app.AlertController$ButtonHandler.handleMessage(AlertController.java:175)
2023-03-03 23:21:12.180 5266-5266 System.err com.example.racestats W at android.os.Handler.dispatchMessage(Handler.java:106)
2023-03-03 23:21:12.180 5266-5266 System.err com.example.racestats W at android.os.Looper.loopOnce(Looper.java:201)
2023-03-03 23:21:12.180 5266-5266 System.err com.example.racestats W at android.os.Looper.loop(Looper.java:288)
2023-03-03 23:21:12.180 5266-5266 System.err com.example.racestats W at android.app.ActivityThread.main(ActivityThread.java:7872)
2023-03-03 23:21:12.180 5266-5266 System.err com.example.racestats W at java.lang.reflect.Method.invoke(Native Method)
2023-03-03 23:21:12.180 5266-5266 System.err com.example.racestats W at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:548)
2023-03-03 23:21:12.180 5266-5266 System.err com.example.racestats W at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:936)
2023-03-03 23:21:12.181 5266-5266 System.err com.example.racestats W Caused by: android.system.ErrnoException: open failed: EACCES (Permission denied)
2023-03-03 23:21:12.181 5266-5266 System.err com.example.racestats W at libcore.io.Linux.open(Native Method)
2023-03-03 23:21:12.181 5266-5266 System.err com.example.racestats W at libcore.io.ForwardingOs.open(ForwardingOs.java:563)
2023-03-03 23:21:12.181 5266-5266 System.err com.example.racestats W at libcore.io.BlockGuardOs.open(BlockGuardOs.java:274)
2023-03-03 23:21:12.181 5266-5266 System.err com.example.racestats W at libcore.io.ForwardingOs.open(ForwardingOs.java:563)
2023-03-03 23:21:12.181 5266-5266 System.err com.example.racestats W at android.app.ActivityThread$AndroidOs.open(ActivityThread.java:7758)
2023-03-03 23:21:12.181 5266-5266 System.err com.example.racestats W at libcore.io.IoBridge.open(IoBridge.java:560)
2023-03-03 23:21:12.181 5266-5266 System.err com.example.racestats W ... 14 more
Kotlin Code:
/**
* This function will set the CPU Temp in are UI and will handles all things associated with the CPU temp.
*/
fun cpuTemperature(activity: Activity, callback: (Float) -> Unit) {
val permissionCheck = ContextCompat.checkSelfPermission(activity, Manifest.permission.MANAGE_EXTERNAL_STORAGE)
if (permissionCheck != PackageManager.PERMISSION_GRANTED) {
if (ActivityCompat.shouldShowRequestPermissionRationale(activity, Manifest.permission.MANAGE_EXTERNAL_STORAGE)) {
Toast.makeText(activity, "This permission is required to access the CPU temperature.", Toast.LENGTH_LONG).show()
}
val alertDialogBuilder = AlertDialog.Builder(activity)
alertDialogBuilder.setTitle("Permission Request")
alertDialogBuilder.setMessage("The app needs access to external storage to read the CPU temperature. Do you allow this permission?")
alertDialogBuilder.setPositiveButton("Allow") { _, _ ->
ActivityCompat.requestPermissions(activity, arrayOf(Manifest.permission.READ_INTERNAL_STORAGE), 1)
ActivityCompat.requestPermissions(activity, arrayOf(Manifest.permission.READ_EXTERNAL_STORAGE), 1)
getCpuTemperature(callback)
}
alertDialogBuilder.setNegativeButton("Deny") { dialog, _ ->
dialog.dismiss()
// set cpu temp to be invisible
}
alertDialogBuilder.show()
} else {
getCpuTemperature(callback)
}
}
fun getCpuTemperature(callback: (Float) -> Unit) {
return try {
val reader = RandomAccessFile("/sys/devices/virtual/thermal/thermal_zone0/temp", "r")
val line: String = reader.readLine()
if (line != null) {
val temp = line.toFloat()
println(temp / 1000.0f)
callback(temp / 1000.0f)
} else {
println(51.0f)
callback(51.0f)
}
} catch (e: Exception) {
println("about to look for temp")
e.printStackTrace()
println("Temp is below")
println(0.0f)
callback(0.0f)
}
}
AndroidManifest.xml:
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools">
<uses-permission android:name="android.permission.MANAGE_EXTERNAL_STORAGE" />
<uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" />
<uses-permission android:name="android.permission.READ_INTERNAL_STORAGE" />
<application
android:allowBackup="true"
android:requestLegacyExternalStorage="true"
android:dataExtractionRules="@xml/data_extraction_rules"
android:fullBackupContent="@xml/backup_rules"
android:icon="@mipmap/ic_launcher"
android:label="@string/app_name"
android:roundIcon="@mipmap/ic_launcher_round"
android:supportsRtl="true"
android:theme="@style/Theme.RaceStats"
tools:targetApi="31">
<activity
android:name=".TopSpeed"
android:exported="false">
<meta-data
android:name="android.app.lib_name"
android:value="" />
</activity>
<activity
android:name=".MainActivity"
android:exported="true">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
<meta-data
android:name="android.app.lib_name"
android:value="" />
</activity>
</application>
</manifest>
