android-sensors

I am working with OpenCV , Android and OpenGL for an Augmented Reality project. As far as I know the coordintate system in OpenGL is The OpenCV coordinate system is: When combining these devices with android sensors how can I do the coordinate system conversions and [R|t] matrix conversion? Is there a good tutorial or documentation were all of this conffusing stuff is explained? If you look at the picture, then you see, that the both coordinate systems have the same handednes, but the OpenCV one is rotated by pi around the x axis. This can be represented by the following rotation matrix: 1 0 0

Possible Duplicate: Android accelerometer accuracy (Inertial navigation) I am using the following code to calculate the distance. tnew and anew are arraylists containing timestamps and accelerations respectively. double distance=0; double init_vel=0; long time_prev=tnew.next(); while(anew.hasNext()) { float temp_acc=anew.next(); long temp_time=tnew.next(); interval=(temp_time-time_prev)/1000f; //milliseconds to seconds double fin_vel=init_vel+(temp_acc*interval); distance+=(init_vel*interval)+0.5f*temp_acc*interval*interval; init_vel=fin_vel; time_prev=temp_time; } Is there any logical mistake

My app is a dialer and when user holding the phone near his head I need to turn screen off and prevent clicking on the controls - like native Android dialer behavior. What API level I need and how can I do this in right way? 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

I'm working on a BluetoothLE sensor device, for which I need to form a one-to-many broadcast of data. As per the spec, peripherals may only have a single master, and due to limitations of the chip and stack I'm designing on, a master can only have three slaves. From what I understand, Android cannot become a BLE slave anyway, so having my device as a master is not an option. Both the BT4 spec and manufacturer documentation talk about another mode of operation, referred to as Broadcast mode. In broadcast mode, a connection is never made, and the application data is transmitted as part of the