how to get android cpu temperature programmatically

Question

Tried this but got 0.0 and on physical device nothing found.. Any way to get cpu temperature in android

SensorManager mySensorManager = (SensorManager) getSystemService(SENSOR_SERVICE);
    Sensor AmbientTemperatureSensor
            = mySensorManager.getDefaultSensor(Sensor.TYPE_AMBIENT_TEMPERATURE);
    if (AmbientTemperatureSensor != null) {
        mySensorManager.registerListener(
                AmbientTemperatureSensorListener,
                AmbientTemperatureSensor,
                SensorManager.SENSOR_DELAY_NORMAL);
    }

private final SensorEventListener AmbientTemperatureSensorListener = new SensorEventListener() {

    @Override
    public void onAccuracyChanged(Sensor sensor, int accuracy) {
        // TODO Auto-generated method stub

    }

    @Override
    public void onSensorChanged(SensorEvent event) {
        if (event.sensor.getType() == Sensor.TYPE_AMBIENT_TEMPERATURE) {
            temperature = event.values[0];
            Messages.sendMessage(getApplicationContext(),Float.toString(temperature));
        }
    }

};

Answer 1

public static float cpuTemperature()
{
    Process process;
    try {
        process = Runtime.getRuntime().exec("cat sys/class/thermal/thermal_zone0/temp");
        process.waitFor();
        BufferedReader reader = new BufferedReader(new InputStreamReader(process.getInputStream()));
        String line = reader.readLine();
        if(line!=null) {
            float temp = Float.parseFloat(line);
            return temp / 1000.0f;
        }else{
            return 51.0f;
        }
    } catch (Exception e) {
        e.printStackTrace();
        return 0.0f;
    }
}

Answer 2

There is a system service for this kind of stuff HardwarePropertiesManager that contain a method getDeviceTemperatures(int type, int source) which is available from Nougat

if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.N) {
    HardwarePropertiesManager hardwarePropertiesManager= (HardwarePropertiesManager) getSystemService(Context.HARDWARE_PROPERTIES_SERVICE);
     float[] temp = hardwarePropertiesManager.getDeviceTemperatures(HardwarePropertiesManager.DEVICE_TEMPERATURE_CPU, HardwarePropertiesManager.TEMPERATURE_CURRENT);
}

Take a look to this : https://developer.android.com/reference/android/os/HardwarePropertiesManager