方向传感器的应用—指北针（Application of compass direction sensor）.doc

方向传感器的应用—指北针（Application of compass direction sensor） Look at a section of code, which is to be done in activity Package com.zhoujt; Import android.app.Activity; Import android.content.Context; Import android.hardware.Sensor; Import android.hardware.SensorEvent; Import android.hardware.SensorEventListener; Import android.hardware.SensorManager; Import android.os.Bundle; Import android.util.Log; Public, class, main, extends, Activity { / / sensor management object SensorManager manager; Sensor / object Sensor sensor; / / interface OrenView view; A new sensor / event listener, rewrite the method, is mainly to rewrite onSensorChanged SensorEventListener listener = new, SensorEventListener () { Public, void, onSensorChanged (SensorEvent, event) { / / this float elaborate, is floating an array of length three, each element has a different meaning in different sensor. Because the direction sensor is used here, only the first floating-point number is concerned, that is, the angle. Moreover, this angle is relative to the degree of the North (0 in the north, clockwise in the East, 90 in the south, 180 in the West and 270 in the West) Float orentation = event.values[0]; Log.i (####, +orentation); This value is passed to the page will / / View.setDegree (orentation); } Public void onAccuracyChanged (Sensor sensor, int accuracy) {} }; Public, void, onCreate (Bundle, savedInstanceState) { Super.onCreate (savedInstanceState); / / page object View = new, OrenView (this); SetContentView (view); Get / / sensor management object Manager = (SensorManager) this.getSystemService (Context.SENSOR_SERVICE); Get / / sensor object, Sensor.TYPE_ORIENTATION is a static int constant, different sensors Sensor = manager.getDefaultSensor (Sensor.TYPE_ORIENTATION); The registration / sensor, returns a Boolean value is used to determine whether the registration is successful, determine the next step / / the third parameter represents the sensitivity of the sensor or refresh rate //boolean reg = Mana