Android传感器的运用之ACCELEROMETER
Android传感器的运用之ACCELEROMETER
Android中支持很多种传感器:比如加速度,重力的,光感,磁感等等。
在运用该API常用到的两个类和一个接口
SensorManager:传感器管理类;
Sensor:一个描述传感器的类;
SensorEventListener:传感器事件监听类(SensorListener类已过期);
一般运用步骤:
1.通过上下文获取SensorManager的对象。
[java]- Context.getSystemService(Context.Sensor_service);
[java]
- Sensor sensor = sensorManager.getDefaultSensor(Sensor.TYPE_ACCELEROMETER);
3.实现传感器监听接口
4.注册传感器
5.反注册传感器
代码例子都很简单简短。
以下附上我以前用到的一个关于加速度的传感器,我用来做摇晃事件监听;
[java]
- /**
- * 摇动检测器
- * @author Nono
- *
- */
- public class ShakeDetector implements SensorEventListener{
- private static final String TAG = ShakeDetector.class.getSimpleName();
- private static final double SHAKE_SHRESHOLD = 7000d;
- private Context mContext;
- private long lastTime ;
- private float last_x;
- private float last_y;
- private float last_z;
- private SensorManager sensorManager;
- private onShakeListener shakeListener;
- /**
- * 构造
- * @param context
- */
- public ShakeDetector(Context context){
- mContext = context;
- sensorManager = (SensorManager) context.getSystemService(Context.SENSOR_SERVICE);
- }
- /**
- * 注册传感器
- */
- public boolean registerListener() {
- if (sensorManager != null) {
- Sensor sensor = sensorManager
- .getDefaultSensor(Sensor.TYPE_ACCELEROMETER);
- if (sensor != null) {
- this.sensorManager.registerListener(this, sensor,
- SensorManager.SENSOR_DELAY_GAME);
- LogUtil.log(TAG, "registerListener: succeed!!");
- return true;
- }
- }
- return false;
- }
- /**
- * 反注册传感器
- */
- public void unRegisterListener() {
- if (sensorManager != null)
- sensorManager.unregisterListener(this);
- }
- public void setOnShakeListener(onShakeListener listener){
- shakeListener = listener;
- }
- public void onSensorChanged(SensorEvent event) {
- //if (event.sensor.getType() == SensorManager.SENSOR_ACCELEROMETER) {
- long curTime = java.lang.System.currentTimeMillis();
- if ((curTime - lastTime) > 10) {
- long diffTime = (curTime - lastTime);
- lastTime = curTime;
- float x = event.values[0];
- float y = event.values[1];
- float z = event.values[2];
- float speed = Math.abs(x + y + z - last_x - last_y - last_z)
- / diffTime * 10000;
- if (speed > SHAKE_SHRESHOLD) {
- // 检测到摇晃后执行的代码
- shakeListener.onShake();
- }
- last_x = x;
- last_y = y;
- last_z = z;
- }
- //}
- }
- public void onAccuracyChanged(Sensor sensor, int accuracy) {
- // TODO Auto-generated method stub
- }
- /**
- *
- * @author Nono
- *
- */
- public interface onShakeListener{
- public void onShake();
- }
- }
在Activity中实例化该类,并实现onShakeListener接口
[java]
- @Override
- protected void onCreate(Bundle savedInstanceState) {
- requestWindowFeature(Window.FEATURE_CUSTOM_TITLE);
- super.onCreate(savedInstanceState);
- mContext = this;
- mShakeDetector = new ShakeDetector(mContext);
- mShakeDetector.setOnShakeListener(this);
在onshakeListener中onShake方法中做传感器检测到变动的事件处理。
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