First of all sorry to repost the question as I didn't post my code earlier just written some lines now I am failing to explain.So posting the question again with codes. I have written a code that will log the acceleromter data and save the data in a csv file. What I need to do is I have to run the acceleromter in background as a service. So,I m done with writing the codes for 1.running the accelerometer, 2.shown the data in textbox, 3.write the data in a csv file. Things that are left is making it a service. I m giving the code below(Howfar I have done)
@SuppressWarnings("deprecation")
public class AccelerometerVaue extends Activity implements SensorListener {
SensorManager sm = null;
TextView xacc= null;
TextView yacc = null;
TextView zacc = null;
TextView xorient = null;
TextView yorient = null;
TextView zorient = null;
TextView text = null;
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
sm = (SensorManager) getSystemService(SENSOR_SERVICE);
setContentView(R.layout.activity_main);
xacc = (TextView) findViewById(R.id.xvalue);
yacc = (TextView) findViewById(R.id.yvalue);
zacc = (TextView) findViewById(R.id.zvalue);
xorient = (TextView) findViewById(R.id.xvalues);
yorient = (TextView) findViewById(R.id.yvalues);
zorient = (TextView) findViewById(R.id.zvalues);
}
@SuppressLint("SdCardPath")
public void onSensorChanged(int sensor, float[] values) {
synchronized (this) {
if (sensor == SensorManager.SENSOR_ORIENTATION) {
xorient.setText("Orientation X: " + values[0]);
yorient.setText("Orientation Y: " + values[1]);
zorient.setText("Orientation Z: " + values[2]);
}
if (sensor == SensorManager.SENSOR_ACCELEROMETER) {
// Time now = new Time();
// now.setToNow();
SimpleDateFormat sdf = new SimpleDateFormat("HH:mm:ss");
String currentDateandTime = sdf.format(new Date());
Log.d("Time",currentDateandTime);
xacc.setText("Accel X: " + values[0]);
yacc.setText("Accel Y: " + values[1]);
zacc.setText("Accel Z: " + values[2]);
String res=String.valueOf(currentDateandTime+"#"+values[0])+"#"+String.valueOf(values[1])+"#"+String.valueOf(values[2]);
Log.d("test", res);
CSVWriter writer = null;
try
{
//Log.d("check","pasla");
//Environment.getExternalStorageDirectory().getPath();
writer = new CSVWriter(new FileWriter("/sdcard/AccelData.csv",true), ',');
String[] entries = res.split("#"); // array of your values
writer.writeNext(entries);
//FileWriter
writer.close();
}
catch (IOException e)
{
//error
}
}
}
}
public void onAccuracyChanged(int sensor, int accuracy) {
String tag = null;
Log.e(tag,"onAccuracyChanged: " + sensor + ", accuracy: " + accuracy);
}
@Override
protected void onResume() {
super.onResume();
sm.registerListener(this,
SensorManager.SENSOR_ORIENTATION |
SensorManager.SENSOR_ACCELEROMETER,
SensorManager.SENSOR_DELAY_NORMAL);
}
@Override
protected void onStop() {
sm.unregisterListener(this);
super.onStop();
}
}
So, now I need to run a background service which will keep taking accelerometer data in background and also keep saving into that csv file. How can I do this? One more I like to ask is it possible to take the acc data after a certain period of time? Suppose here I m logging all the data continuously which is huge and thew battery drain will be huge. So, I need to implemented the service in such a way so that it will run in background for 15mins and log the data for 10 seconds at the beginning of each minute.
I have just replied to a similar question.
You can use Android's scheduling mechanism, called AlarmManager, to schedule your services.
There is a problem inerent to this approach, though: when the system is in battery-saving sleep state, your service has to acquire a wake lock in order to execute properly, then when finished release the wake lock for the system to go back to sleep state. Implementing this wake lock acquisition/release mechanism is not a trivial task.
I recommend using Commonsware's WakefulIntentService in order to avoid writing your own wake lock acquisition/release mechanism for your service. It's very easy to use. You will basically declare a class that extends the WakefulIntentService class and override its doWakefulWork() method. In that method you will poll for accelerometer data and write it to a file. I'll just let you down in the part of displaying the data in the screen, I don't know how to do that (I suppose you will have to perform a bind to the service though). <:)