How I get CPU usage and temperature information into an android app?

Question

I\'m developing an application and I don\'t know how can I get CPU usage and temperature, example in a textview. I try with TYPE_AMBIENT_TEMPERATURE to get temp

Answer 1

for the CPU frequency you can use

public static int[] getCPUFrequencyCurrent() throws Exception {
    int[] output = new int[getNumCores()];
    for(int i=0;i

you might want to use this one too:

public static int getNumCores() {
    //Private Class to display only CPU devices in the directory listing
    class CpuFilter implements FileFilter {
        @Override
        public boolean accept(File pathname) {
            //Check if filename is "cpu", followed by a single digit number
            if(Pattern.matches("cpu[0-9]+", pathname.getName())) {
                return true;
            }
            return false;
        }
    }

    try {
        //Get directory containing CPU info
        File dir = new File("/sys/devices/system/cpu/");
        //Filter to only list the devices we care about
        File[] files = dir.listFiles(new CpuFilter());
        //Return the number of cores (virtual CPU devices)
        return files.length;
    } catch(Exception e) {
        //Default to return 1 core
        return 1;
    }
}

for the temperature (https://stackoverflow.com/a/11931903/1031297)

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) {
 }

PS. You first need to check if the sensor is present...If it isn't, there's nothing that can be done. I guess some of the apps lie.

PS2. You can always reverse engineer an app to see how they display the temperature ;)