android-sensors

问题 I want to detect a metal using magnetic sensor values. i am getting values continuously like x=30.00 ,y=-20.00 ,z=-13.00 now i want to know how to use these values for detecting any metal(mathameticalcalu,formulas) code is sensorManager = (SensorManager) getSystemService(SENSOR_SERVICE); // get compass sensor (ie magnetic field) myCompassSensor = sensorManager.getDefaultSensor(Sensor.TYPE_MAGNETIC_FIELD); float azimuth = Math.round(event.values[0]); float pitch = Math.round(event.values[1]);

问题 This is a followup to my question here: Android thread runnable performance I'm having some difficulty wrapping my head around synchronized methods for my app I'm polling the sensors and storing the sensor values into arrays whenever they change float[] accelerometerMatrix = new float[3]; float[] accelerometerWorldMatrix = new float[3]; float[] gyroscopeMatrix = new float[3]; float[] gravityMatrix = new float[3]; float[] magneticMatrix = new float[3]; float[] rotationMatrix = new float[9];

问题 I have developed application for two different sensors. They are working fine separately but when I try to use them togather and create two diffent buses than Alljoyn gives this exception. org.alljoyn.services.common.BusAlreadyExistException: The object has been set previously with a BusAttachment. Below is my source code for connection. Can anyone tell me why I'm having this issue. private void connect() { org.alljoyn.bus.alljoyn.DaemonInit.PrepareDaemon(getApplicationContext()); bus = new

问题 I have written a small code to convert the device co-ordinates into world co-ordinates by multiplying the Rotation matrix(using getRotationMatrix) and the vector (Ax,Ay,Az) which are the accelerometer values. When I run this, and the phone is static, I get a very fluctuating value for the Z axis(from 9.3 to 10.3) and the other two are 0. However when I give the phone some acceleration in any direction , it still doesn't show any change to those values and they remain zero. This is the part of

问题 I am trying to get the phone angles by using TYPE_ACCELEROMETER sensor. My goal is to get the angle values only after the phone is tilted. It works, but the problem is when I put my phone facing up on the table, it still says isLandscape = true; private boolean isLandscape; mSensorManager = (SensorManager)getSystemService(SENSOR_SERVICE); mSensorManager.registerListener(mSensorListener, mSensorManager.getDefaultSensor( Sensor.TYPE_ACCELEROMETER),1000000); private final SensorEventListener

问题 I'm creating an app that starts a service when "Start" button pressed and stops it when "Stop" button is pressed. in the service, I register a listener for sensor ACCELEROMETER so that I get the accelerometer values of x,y,z axes.. but when I stop my application and unregister the listener from the sensor, even then I get my accelerometer values. Here's the code: // Service public class Accel extends Service { private static Context CONTEXT; private static Sensor sensor; private static

问题 I am working on an application to draw in the air with an android phone. As my phone is moving, thanks to the acceletometer, i retrieve the acceleration on each axis ax, ay, az. What I am interested in is: x,y,z. From what I read in forums and in some tutorials, integrating the accelaration twice gives huge errors. So what is the best solution for me to get information on the deplacement of the phone? Thanks for your help. 回答1: Not exactly what you are looking for: Store orientation to an

问题 I have application using Android 2.1 which utilize LocationManager to get the altitude. But now, I need to obtain the altitude using SensorManager which requires API Level 9 (2.3). How can I put the SensorManager.getAltitude(float, float) in my 2.1 android application by putting a condition and calling it by a function name (possible in normal Java)? Thank you in advance UPDATE 1 If you have noticed that my application need to be compiled using Android 2.1. That's why I'm looking for a way to

问题 I developed an app and some people complains that it takes too much battery, it is the second most consuming process after the screen. However, in some devices it does not consumes that much battery. All the work my app do is in a service. The service is sticky and is running all the time (the android system may kill it when has low resources or pause it when device go to sleep), it has listener to the accelerometer as long as the screen is on, it is not foreground service and does not hold

问题 I developed an app and some people complains that it takes too much battery, it is the second most consuming process after the screen. However, in some devices it does not consumes that much battery. All the work my app do is in a service. The service is sticky and is running all the time (the android system may kill it when has low resources or pause it when device go to sleep), it has listener to the accelerometer as long as the screen is on, it is not foreground service and does not hold