传感器：方向 、重力、磁场、温度、近距离、压力、光线、加速度

下面是如何使用方向传感器（指南针）：

使用自定义view画出指南针

public class MainActivity extends Activity{    private SensorManager manager;    private Sensor mSensor;    float[] mValues;    private SampleView mView;    @SuppressWarnings("deprecation")    @Override    protected void onCreate(Bundle savedInstanceState)    {        super.onCreate(savedInstanceState);        mView = new SampleView(this);//使用自定义view        setContentView(mView);    //得到传感器管理器        manager = (SensorManager)                         getSystemService(Context.SENSOR_SERVICE);    //得到方向传感器        mSensor = manager.getDefaultSensor(Sensor.TYPE_ORIENTATION);    }    SensorEventListener mListener = new SensorEventListener()    {        @Override        public void onSensorChanged(SensorEvent event)        {            mValues = event.values;            if (mView != null)            {                mView.invalidate();//event发生改变时，重绘            }        }        @Override        public void onAccuracyChanged(Sensor sensor, int accuracy)        {        //精确改变，适用游戏        }    };    @Override    protected void onStart()    {        super.onStart();        //在onstart()或onresume()里,管理器注册监听事件        manager.registerListener(mListener, mSensor,             SensorManager.SENSOR_DELAY_GAME);    }    @Override    public boolean onCreateOptionsMenu(Menu menu)    {        getMenuInflater().inflate(R.menu.main, menu);        return true;    }    private class SampleView extends View    {        private Paint   mPaint = new Paint();        private Path    mPath = new Path();        private boolean mAnimate;        private long    mNextTime;        public SampleView(Context context)        {            super(context);            // Construct a wedge-shaped path            mPath.moveTo(0, -50);            mPath.lineTo(-20, 60);            mPath.lineTo(0, 50);            mPath.lineTo(20, 60);            mPath.close();        }        @Override protected void onDraw(Canvas canvas)        {            Paint paint = mPaint;            canvas.drawColor(Color.WHITE);            paint.setAntiAlias(true);            paint.setColor(Color.BLACK);            paint.setStyle(Paint.Style.FILL);            int w = canvas.getWidth();            int h = canvas.getHeight();            int cx = w / 2;            int cy = h / 2;            canvas.translate(cx, cy);            if (mValues != null)            {                canvas.rotate(-mValues[0]);            }            canvas.drawPath(mPath, mPaint);        }        @Override        protected void onAttachedToWindow()        {        mAnimate = true;        super.onAttachedToWindow();        }        @Override        protected void onDetachedFromWindow()        {            mAnimate = false;            super.onDetachedFromWindow();        }    }}