Here’s a link to a blog with a solution. Essentially, you stop using the Orientation Sensor and use the Magnetic Field Sensor and Accelerometer Sensor(s) in tandem to get equivalent functionality. It’s more work but it does allow you to continue to use a callback to handle orientation changes. EDIT: Since the original site is … Read more
I found solution by disassembling one very famous VoIP application. This activity after pressing button1 will disable screen and hardware keys when you close sensors. After pressing button2 this function will be switched off. Also, this function required permission: <uses-permission android:name=”android.permission.WAKE_LOCK” /> Activity. Try it. public class MainActivity extends Activity { private Button button1; private … Read more
http://developer.android.com/reference/android/os/BatteryManager.html public static final String EXTRA_TEMPERATURE Extra for ACTION_BATTERY_CHANGED: integer containing the current battery temperature.
There is no actual “orientation” sensor – this is (was) actually a composite sensor, generated from a combination of the accelerometer and the magnometer. From http://developer.android.com/reference/android/hardware/SensorEvent.html “This sensor type exists for legacy reasons, please use getRotationMatrix() in conjunction with remapCoordinateSystem() and getOrientation() to compute these values instead.” public class OrientationTestActivity extends Activity implements SensorEventListener { … Read more
In my comment on the checked answer on the link you provided above, I referred to my simple answer at calculate acceleration in reference to true north Let me answer here again with more clarification. The answer is the product of the rotation matrix and the magnetic field values. If you read further on the … Read more
By co-incidence I’ve been thinking about this problem for several weeks, because As a mathematician, I haven’t been satisfied by any of the answers that I’ve seen suggested elsewhere; and I need a good answer for an app that I’m working on. So over the last couple of days I’ve come up with my own … Read more
You get position by integrating the linear acceleration twice but the error is horrible. It is useless in practice. Here is an explanation why (Google Tech Talk) at 23:20. I highly recommend this video. Similar questions: track small movements of iphone with no GPS What is the real world accuracy of phone accelerometers when used … Read more
As some of you mentioned you got the equations wrong but that is just a part of the error. Newton – D’Alembert physics for non relativistic speeds dictates this: // init values double ax=0.0,ay=0.0,az=0.0; // acceleration [m/s^2] double vx=0.0,vy=0.0,vz=0.0; // velocity [m/s] double x=0.0, y=0.0, z=0.0; // position [m] // iteration inside some timer (dt … Read more
Best way seems to be the following: final LocationManager manager = (LocationManager) getSystemService( Context.LOCATION_SERVICE ); if ( !manager.isProviderEnabled( LocationManager.GPS_PROVIDER ) ) { buildAlertMessageNoGps(); } private void buildAlertMessageNoGps() { final AlertDialog.Builder builder = new AlertDialog.Builder(this); builder.setMessage(“Your GPS seems to be disabled, do you want to enable it?”) .setCancelable(false) .setPositiveButton(“Yes”, new DialogInterface.OnClickListener() { public void onClick(@SuppressWarnings(“unused”) final … Read more