Get Current Temperature CPU android

Question

I made code to read cpu temperature in android. But there is an error like this

java.io.FileNotFoundException: /sys/devices/virtual/thermal/thermal_zone0/temp: open failed: EACCES (Permission denied)

private double getCurrentCPUTemperature() throws IOException, InterruptedException { ArrayList <Float> suhu = new ArrayList<>(); Process process; String line; BufferedReader reader; RandomAccessFile reader1; for (int i = 0; i <= 30 ; i ++ ) { process = Runtime.getRuntime().exec("cat /sys/devices/virtual/thermal/thermal_zone" + i + "/temp"); process.waitFor(); reader = new BufferedReader(new InputStreamReader(process.getInputStream())); line = reader.readLine(); System.out.println("Line = " + line); if(line != null){ Float temp = Float.parseFloat(line); suhu.add(temp); } if(line == null){ reader1 = new RandomAccessFile("/sys/devices/virtual/thermal/thermal_zone" + i +"/temp", "r"); line = reader.readLine(); if (line != null){ System.out.println(line + " RAM"); Float temp1 = Float.parseFloat(line); suhu.add(temp1); } } if (i == 30){ reader.close(); process.destroy(); } } double temp = 0.0; for (int i = 0; i < suhu.size() ; i++){ if (suhu.get(i) > temp){ temp = (double) suhu.get(i); } } System.out.println(suhu); return temp; }

i have make request permission for read and write external storage. Manifest :

<manifest xmlns:android="http://schemas.android.com/apk/res/android" xmlns:tools="http://schemas.android.com/tools" package="com.example.gpc1"> <uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION"/> <uses-permission android:name="android.permission.ACCESS_FINE_LOCATION"/> <uses-permission android:name="android.permission.INTERNET"/> <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/> <uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE"/> <application android:icon="@mipmap/ic_launcher" android:label="@string/app_name" android:roundIcon="@mipmap/ic_launcher_round"

And in activity

protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_sensor); BottomNavigationView bottomNavigationView = findViewById(R.id.bottom_navigation); bottomNavigationView.setSelectedItemId(R.id.page_2); bottomNavigationView.setOnNavigationItemSelectedListener(this); requestPermissionStorage(); @Override public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions, @NonNull int[] grantResults) { super.onRequestPermissionsResult(requestCode, permissions, grantResults); if(requestCode == STORAGE_PERMISSION_CODE){ if (grantResults.length > 0 && grantResults[0] == PackageManager.PERMISSION_GRANTED) { requestPermissionStorage(); } else { Toast.makeText(this, "Permission DENIED", Toast.LENGTH_SHORT).show(); } } } private void requestPermissionStorage() { if (ActivityCompat.checkSelfPermission(this, Manifest.permission.READ_EXTERNAL_STORAGE) != PackageManager.PERMISSION_GRANTED) { ActivityCompat.requestPermissions(this, new String[] {Manifest.permission.READ_EXTERNAL_STORAGE, Manifest.permission.WRITE_EXTERNAL_STORAGE}, 1); } else { System.out.println("Request External Storage"); } }

Thanks and i appreciate your help

no need to say sorry for your bad english, we're all here from different backgrounds :) — a_local_nobody
– a_local_nobody, Commented Feb 17, 2021 at 9:07

Ryoichiro Oka · Accepted Answer · 2024-01-15 06:25:43Z

I too couldn't get hold of TYPE_AMBIENT_TEMPERATURE with my phones, so instead decided to monitor the battery temperature:

var batteryReceiver = new BroadcastReceiver() { @Override public void onReceive(Context context, Intent intent) { var temperature = intent.getIntExtra(BatteryManager.EXTRA_TEMPERATURE, 0); var celsius = temperature / 10.0f; // Battery temperature in Celsius Log.i(TAG, String.format("temperature: %f", celsius)); } }; registerReceiver(batteryReceiver, new IntentFilter(Intent.ACTION_BATTERY_CHANGED));

Works the way you would expect. Close enough for my use case.

Hope that helps, cheers

George Sepetadelis · Accepted Answer · 2021-02-17 09:40:07Z

You can use TYPE_AMBIENT_TEMPERATURE for battery or CPU temperature. TYPE_TEMPERATURE is the depcrecated constant.

The modified version of code available at documentation should be like this:

import android.app.Activity; import android.hardware.Sensor; import android.hardware.SensorEvent; import android.hardware.SensorEventListener; import android.hardware.SensorManager; public class TempSensorActivity extends Activity, implements SensorEventListener { private final SensorManager mSensorManager; private final Sensor mTempSensor; public TempSensorActivity() { mSensorManager = (SensorManager)getSystemService(SENSOR_SERVICE); mTempSensor = mSensorManager.getDefaultSensor(Sensor.TYPE_AMBIENT_TEMPERATURE); } protected void onResume() { super.onResume(); mSensorManager.registerListener(this, mTempSensor, SensorManager.SENSOR_DELAY_NORMAL); } protected void onPause() { super.onPause(); mSensorManager.unregisterListener(this); } public void onAccuracyChanged(Sensor sensor, int accuracy) { } public void onSensorChanged(SensorEvent event) { } }

Look at sensor documentation for more

Thanks sir for answer. I had used TYPE_AMBIENT_TEMPERATURE and TYPE_TEMPERATURE, but they give result null.. I want to read CPU temperature from file like this source link
Depending of model, you may or may not have access to /sys/devices/virtual/thermal directory. In your case, you can't have access because the constructor blocked it. The only official way to get the temperature is the solution using TYPE_AMBIENT_TEMPERATURE , even if not implemented by all constructors
Thank you Sir for the Answer @dgp. i tried with different android. The different android can give value for temperature...
This looks very much like a rip off of this answer, without properly linking it, not nice

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