Android方向传感器

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/** * 传感器指针Demo *  * @description： * @author ldm * @date 2016-4-25 下午5:29:18 */public class SensorHandActivity extends GraphicsActivity {    // 传感器管理对象    private SensorManager mSensorManager;    // 传感器类    private Sensor mSensor;    // 自定义绘制指针View    private MyCompassView mView;    /**     * 方向传感器检测到的感应值 values[0]: Azimuth(方位)，地磁北方向与y轴的角度，围绕z轴旋转(0到359)。0=North,     * 90=East, 180=South, 270=West values[1]: Pitch(俯仰),围绕X轴旋转(-180 to 180),     * 当Z轴向Y轴运动时是正值 values[2]: Roll(滚)，围绕Y轴旋转(-90 to 90)，当X轴向Z轴运动时是正值     */    private float[] mValues;    // 传感监听    private final SensorEventListener mSensorListener = new SensorEventListener() {        public void onSensorChanged(SensorEvent event) {            mValues = event.values;            if (mView != null) {                mView.invalidate();            }        }        public void onAccuracyChanged(Sensor sensor, int accuracy) {        }    };    @SuppressWarnings("deprecation")    @Override    protected void onCreate(Bundle icicle) {        super.onCreate(icicle);        mSensorManager = (SensorManager) getSystemService(Context.SENSOR_SERVICE);        mSensor = mSensorManager.getDefaultSensor(Sensor.TYPE_ORIENTATION);        mView = new MyCompassView(this);        setContentView(mView);    }    @Override    protected void onResume() {        super.onResume();        /**         * 在onResume方法中注册传感器监听 事件         * 第一个参数：监听Sensor事件，第二个参数是Sensor目标种类的值，第三个参数是延迟时间的精度密度。延迟时间的精密度参数 参数         * 延迟时间 SensorManager.SENSOR_DELAY_FASTEST 0ms         * SensorManager.SENSOR_DELAY_GAME 20ms SensorManager.SENSOR_DELAY_UI         * 60ms SensorManager.SENSOR_DELAY_NORMAL 200ms         */        mSensorManager.registerListener(mSensorListener, mSensor,                SensorManager.SENSOR_DELAY_GAME);    }    @Override    protected void onStop() {        // 在onStop方法中取消注册监听        mSensorManager.unregisterListener(mSensorListener);        super.onStop();    }    private class MyCompassView extends View {        // 定义画笔Paint        private Paint mPaint;        // 定义绘制指针的路径Path        private Path mPath;        public MyCompassView(Context context) {            super(context);            initPaintAndPath();        }        private void initPaintAndPath() {            // 初始化画笔            mPaint = new Paint();            mPaint.setAntiAlias(true);            mPaint.setColor(Color.BLACK);            mPaint.setStyle(Paint.Style.FILL);            // 初始化绘制路径            mPath = new Path();            mPath.moveTo(0, -50);// 移动到指点点            mPath.lineTo(-20, 60);// 用线条连接到指定点            mPath.lineTo(0, 50);            mPath.lineTo(20, 60);            mPath.close();// 关闭路径        }        @Override        protected void onDraw(Canvas canvas) {            // 设置画面背景            canvas.drawColor(Color.WHITE);            int w = canvas.getWidth();            int h = canvas.getHeight();            int cx = w / 2;            int cy = h / 2;            canvas.translate(cx, cy);// 移动画面，把指针放到中央            if (mValues != null) {                canvas.rotate(-mValues[0]);            }            canvas.drawPath(mPath, mPaint);        }    }}
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