Use of Android phone sensor

Now there are all kinds of sensors in Android phones, such as accelerometers, gyroscopes and the like, I now use a total of nine sensors in the Vivo V3 phone:

Lis3dh-accel : Tri-axis acceleration sensor

Tmd277x-proximity : Near distance sensor

Tmd277x-light : Light sensor

Yas533-orientation : Direction sensor

Yas533-pseudo-gyro : Motion sensor

Yas533-linear-acceleration : Linear acceleration Sensor

Yas533-rotation-vector : rotational vector sensor

Yas533-gravity : Gyroscope

Yas533-mag : Magnetic sensor

The above sensors are self-written by a program measured out.

The operation of the sensor in the phone is nothing more than a few steps:

1. Get sensor Manager
2. Get Sensor Object
3. Registering sensor monitoring
4. Capturing data in sensor monitoring (data change events)

First step: Get the Sensor manager

Sensormanager Sensormanager = (sensormanager) getsystemservice (Context.sensor_service); // Get sensor Manager

There are several important methods in Sensormanager:

• getsensorlist (int type) returns a list collection of all sensor objects (sensors) in the phone set
• Getdefaultsensor (int type) returns the type of the specified sensor object, such as sensors accelsensor = Sensormanager.getdefaultsensor (sensor.type_  ACCELEROMETER); Gets the Accelerometer object
• Registerlistener (sensorlistener Listener, int sensors, int rate) Register Sensor listener Events

Step two: Get the Sensor object

Sensor accelsensor = Sensormanager.getdefaultsensor (Sensor.type_accelerometer); // Get Sensor Object

The sensor object is primarily used to determine what sensor to operate on, in the above example (triaxial) acceleration sensor

• The sensor class has many type_xxxx int-value constants, each of which represents a different sensor, which is primarily used to determine the transducer type when acquiring a sensor object
• GetName () get the sensor name
• Getpower () Gain sensor power, unit unknown
• Getresolution () Get sensor resolution
• GetType () Get sensor type
• Getvendor () Get sensor manufacturer
• GetVersion () Get the sensor version

Step Three: Register Sensor listener Events

Using the Sensormanager in the

/**  *   @param  @param @param */int int Rate

• Create a class to implement the listener's Sensoreventlistener interface, and implement two of these methods: the Onsensorchanged (Sensorevent event) method of the callback when the sensor value changes, the resolution change callback onaccuracychanged (int sensor, int accuracy) method (emphasis)
• The Onsensorchanged (Sensorevent event) method uses Event.values to get the float array, and the value of the array is the measured value, as detailed in the API
• The second parameter passes in the Sensor object
• The third parameter is a sample rate,

  Sensor_delay_normal  200000μs Sampling once

  SENSOR_DELAY_UI 60000μs Sampling Once

  Sensor_delay_game   2000μs Sampling once

  Sensor_delay_fastest   0μs Sampling once (at the fastest CPU sampling rate)

For example:

Sensormanager.registerlistener (new Accellistener (), Accelsensor, sensormanager.sensor_delay_normal); // registering sensor listener Events

    /*** Internal class, implement Sensoreventlistener interface *@authorAdministrator **/    classAccellistenerImplementssensoreventlistener{/** Callback when sensor value changes * @see android.hardware.sensoreventlistener#onsensorchanged (android.hardware.SensorEvent )         */@Override Public voidonsensorchanged (Sensorevent event) {//TODO auto-generated Method Stub            floatI= event.values[0];                        System.out.print (i); } @Override Public voidOnaccuracychanged (sensor sensor,intaccuracy) {            //TODO auto-generated Method Stub                    }            }    

The Android Develop API Android.hardware has a detailed description of the sensor acquisition method and algorithm, and I hope you will read it carefully.

Use of Android phone sensor