015android初级篇之传感器的简单使用

int     TYPE_ACCELEROMETER     A constant describing an accelerometer sensor type. //三轴加速度感应器 返回三个坐标轴的加速度  单位m/s2
int     TYPE_ALL     A constant describing all sensor types.                     //用于列出所有感应器
int     TYPE_GRAVITY     A constant describing a gravity sensor type.                //重力感应器
int     TYPE_GYROSCOPE     A constant describing a gyroscope sensor type            //陀螺仪 可判断方向 返回三个坐标轴上的角度
int     TYPE_LIGHT     A constant describing an light sensor type.                 //光线感应器 单位 lux 勒克斯
int     TYPE_LINEAR_ACCELERATION     A constant describing a linear acceleration sensor type.  //线性加速度
int     TYPE_MAGNETIC_FIELD     A constant describing a magnetic field sensor type.               //磁场感应 返回三个坐标轴的数值  微特斯拉
int     TYPE_ORIENTATION     This constant is deprecated. use SensorManager.getOrientation() instead. //方向感应器 已过时 可以使用方法获得
int     TYPE_PRESSURE     A constant describing a pressure sensor type                             //压力感应器  单位 千帕斯卡
int     TYPE_PROXIMITY     A constant describing an proximity sensor type.                          //距离传感器
int     TYPE_ROTATION_VECTOR     A constant describing a rotation vector sensor type.             //翻转传感器
int     TYPE_TEMPERATURE     A constant describing a temperature sensor type                  //温度传感器 单位 摄氏度

public class MainActivity extends AppCompatActivity
    implements NavigationView.OnNavigationItemSelectedListener,SensorEventListener。

 mSensorManager = (SensorManager) getSystemService(Context.SENSOR_SERVICE);
mSensor = mSensorManager.getDefaultSensor(Sensor.TYPE_ACCELEROMETER);
获取传感器manager对象，及传感器对象，根据注册的参数类型，在回调函数中返回事件

sm.registerListener(this, 
            Sensor.TYPE_ACCELEROMETER |
            Sensor.TYPE_MAGNETIC_FIELD |
            Sensor.TYPE_ORIENTATION |
            Sensor.TYPE_GYROSCOPE |
            Sensor.TYPE_LIGHT |
            Sensor.TYPE_PRESSURE |
            Sensor.TYPE_TEMPERATURE |
            Sensor.TYPE_PROXIMITY |
            Sensor.TYPE_GRAVITY |
            Sensor.TYPE_LINEAR_ACCELERATION |
            Sensor.TYPE_ROTATION_VECTOR,
            SensorManager.SENSOR_DELAY_NORMAL);

    @Override
protected void onResume() {
    super.onResume();
    boolean supported=mSensorManager.registerListener(this,mSensor,SensorManager.SENSOR_DELAY_NORMAL);
    if (!supported) {
        mSensorManager.unregisterListener(this);
        throw new UnsupportedOperationException(
                "Accelerometer not supported");
    }
}

@Override
protected void onPause() {
    super.onPause();
    mSensorManager.unregisterListener(this);
}

 @Override
protected void onStop() {
    mSensorManager.unregisterListener(this);
    super.onStop();
}

public void onSensorChanged(SensorEvent event){
    if (event.sensor.getType() != Sensor.TYPE_ACCELEROMETER) {  
        return;  
    }  
    String str =  "X：" + event.values[0] + "，Y：" + event.values[1] + "，Z：" + event.values[2];

     a=Math.sqrt(event.values[0]*event.values[0]
                +event.values[1]*event.values[1]
                +event.values[2]*event.values[2]);
    DataPoint[] values = new DataPoint[1];
    values[0] = new DataPoint(x,a);
    x++;
    series.appendData(values[0], true, 300);

}

@Override
public void onAccuracyChanged(Sensor sensor,int accuracy){

}