详解Android 传感器开发 完全解析

/**
 * 传感器精度变化时回调
 */
@Override
public void onAccuracyChanged(Sensor sensor, int accuracy) {
}
/**
 * 传感器数据变化时回调
 */
@Override
public void onSensorChanged(SensorEvent event) {
}

TextView tvSensors = (TextView) findViewById(R.id.tv_sensors);
//获取传感器SensorManager对象
SensorManager sensorManager = (SensorManager) getSystemService(SENSOR_SERVICE);
List<Sensor> sensors = sensorManager.getSensorList(Sensor.TYPE_ALL);
for (Sensor sensor : sensors) {
  tvSensors.append(sensor.getName() + "\n");
}

public class SensorActivity extends AppCompatActivity implements SensorEventListener {
  private TextView tvAccelerometer;
  private SensorManager mSensorManager;
  private float[] gravity = new float[3];
  @Override
  protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_sensor);
    tvAccelerometer = (TextView) findViewById(R.id.tv_accelerometer);
    //获取传感器SensorManager对象
    mSensorManager = (SensorManager) getSystemService(SENSOR_SERVICE);
  }
  /**
   * 传感器精度变化时回调
   */
  @Override
  public void onAccuracyChanged(Sensor sensor, int accuracy) {
  }
  /**
   * 传感器数据变化时回调
   */
  @Override
  public void onSensorChanged(SensorEvent event) {
    //判断传感器类别
    switch (event.sensor.getType()) {
      case Sensor.TYPE_ACCELEROMETER: //加速度传感器
        final float alpha = (float) 0.8;
        gravity[0] = alpha * gravity[0] + (1 - alpha) * event.values[0];
        gravity[1] = alpha * gravity[1] + (1 - alpha) * event.values[1];
        gravity[2] = alpha * gravity[2] + (1 - alpha) * event.values[2];

        String accelerometer = "加速度传感器\n" + "x:"
            + (event.values[0] - gravity[0]) + "\n" + "y:"
            + (event.values[1] - gravity[1]) + "\n" + "z:"
            + (event.values[2] - gravity[2]);
        tvAccelerometer.setText(accelerometer);
        //重力加速度9.81m/s^2，只受到重力作用的情况下，自由下落的加速度
        break;
      case Sensor.TYPE_GRAVITY://重力传感器
        gravity[0] = event.values[0];//单位m/s^2
        gravity[1] = event.values[1];
        gravity[2] = event.values[2];
        break;
      default:
        break;
    }
  }
  /**
   * 界面获取焦点，按钮可以点击时回调
   */
  protected void onResume() {
    super.onResume();
    //注册加速度传感器
    mSensorManager.registerListener(this,
        mSensorManager.getDefaultSensor(Sensor.TYPE_ACCELEROMETER),//传感器TYPE类型
        SensorManager.SENSOR_DELAY_UI);//采集频率
    //注册重力传感器
    mSensorManager.registerListener(this,
        mSensorManager.getDefaultSensor(Sensor.TYPE_GRAVITY),
        SensorManager.SENSOR_DELAY_FASTEST);
  }
  /**
   * 暂停Activity，界面获取焦点，按钮可以点击时回调
   */
  @Override
  protected void onPause() {
    super.onPause();
    mSensorManager.unregisterListener(this);
  }

}

public class SensorActivity extends AppCompatActivity implements SensorEventListener {
  private TextView tvProximity;
  private SensorManager mSensorManager;
  @Override
  protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_motion_sensor);
    tvProximity = (TextView) findViewById(R.id.tv_proximity);
    //获取传感器SensorManager对象
    mSensorManager = (SensorManager) getSystemService(SENSOR_SERVICE);
  }
  /**
   * 传感器精度变化时回调
   */
  @Override
  public void onAccuracyChanged(Sensor sensor, int accuracy) {
  }
  /**
   * 传感器数据变化时回调
   */
  @Override
  public void onSensorChanged(SensorEvent event) {
    //判断传感器类别
    switch (event.sensor.getType()) {
      case Sensor.TYPE_PROXIMITY://临近传感器
        tvProximity.setText(String.valueOf(event.values[0]));
        break;
      default:
        break;
    }
  }
  /**
   * 界面获取焦点，按钮可以点击时回调
   */
  protected void onResume() {
    super.onResume();
    //注册临近传感器
    mSensorManager.registerListener(this,
        mSensorManager.getDefaultSensor(Sensor.TYPE_PROXIMITY),
        SensorManager.SENSOR_DELAY_UI);
  }
  /**
   * 暂停Activity，界面获取焦点，按钮可以点击时回调
   */
  @Override
  protected void onPause() {
    super.onPause();
    mSensorManager.unregisterListener(this);
  }

}

//最强的光线强度（估计只有沙漠地带才能达到这个值）
public static final float LIGHT_SUNLIGHT_MAX = 120000.0f;
//万里无云时阳光直射的强度
public static final float LIGHT_SUNLIGHT = 110000.0f;
//有阳光，但被云彩抵消了部分光线时的强度
public static final float LIGHT_SHADE = 20000.0f;
//多云时的光线强度  
public static final float LIGHT_OVERCAST = 10000.0f;
//太阳刚刚升起时（日出）的光线强度
public static final float LIGHT_SUNRISE = 400.0f;
//在阴雨天，没有太阳时的光线强度
public static final float LIGHT_CLOUDY = 100.0f;
//夜晚有月亮时的光线强度
public static final float LIGHT_FULLMOON = 0.25f;
//夜晚没有月亮时的光线强度（当然，也不能有路灯，就是漆黑一片）
public static final float LIGHT_NO_MOON = 0.001f;