这里做了一个指南针,主要用到了Android里的
加速度传感器和地磁传感器Github源码
1.数据初始化
private USensor(Context context) {if (sorMgr == null) {//传感器管理sorMgr = (SensorManager) context.getSystemService(Context.SENSOR_SERVICE);//加速度传感器Sensor accelerometer = sorMgr.getDefaultSensor(Sensor.TYPE_ACCELEROMETER);//地磁传感器Sensor magnetic = sorMgr.getDefaultSensor(Sensor.TYPE_MAGNETIC_FIELD);//注册监听sorMgr.registerListener(this, accelerometer, SensorManager.SENSOR_DELAY_GAME);sorMgr.registerListener(this, magnetic, SensorManager.SENSOR_DELAY_GAME);}}
2.实时系统监听回调并计算
public class USensor implements SensorEventListenerprivate static final int sensitivity = 6;//变化灵敏度，数值越小，变化月灵敏....@Overridepublic void onSensorChanged(SensorEvent event) {if (event.sensor.getType() == Sensor.TYPE_ACCELEROMETER) {accelerometerValues = event.values;}if (event.sensor.getType() == Sensor.TYPE_MAGNETIC_FIELD) {magneticFieldValues = event.values;}float degree = calculateOrientation();if (Math.abs(degree - olDegree) > sensitivity) {if (listener != null) {monD(" --> " + degree);listener.onDegree(olDegree, degree);}}olDegree = degree;}/*** @return 计算偏移量*/private float calculateOrientation() {float[] values = new float[3];float[] R = new float[9];SensorManager.getRotationMatrix(R, null, accelerometerValues, magneticFieldValues);SensorManager.getOrientation(R, values);values[0] = (float) Math.toDegrees(values[0]);return -values[0];}
3.使用示例
这里注意不要把
new动画对象丢到传感器监听里
private USensor sensor;//传感器管理类@Overrideprotected void onResume() {sensor = USensor.instance(this);//使用属性动画旋转指针ViewValueAnimator valueAnimator = new ValueAnimator();valueAnimator.addUpdateListener(animation -> {float degree = (float) animation.getAnimatedValue();VCompass.setRotation(degree);});//传感器处理后的旋转度数sensor.setDegreeListener((olDegree, degree) -> {valueAnimator.setFloatValues(olDegree, degree);valueAnimator.setDuration(100).start();});super.onResume();}@Overrideprotected void onPause() {if (sensor != null) {sensor.clear();}super.onPause();}
