两个类:
1、SensorTest类,是Acvitivity
2、SensorListenerTest类,实现了SensorEventListener类,
SensorTest.java:
package com.sensor; import android.app.Activity; import android.os.Bundle; public class SensorTest extends Activity { /** Called when the activity is first created. */ SensorListenerTest sensorListenerTest; @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); // 传参数的时候,用this,不是自己新建的Context sensorListenerTest = new SensorListenerTest(this); } // 添加OnResume和OnStop,注册和取消Sensor服务。 @Override protected void onResume() { // 监听服务,在activity和Listener里面都要注册,这是一个难点。不要只在一个地方注册。 // TODO Auto-generated method stub super.onResume(); sensorListenerTest.enableSensor(); } @Override protected void onStop() { // TODO Auto-generated method stub super.onStop(); sensorListenerTest.disableSensor(); } }
SensorListenerTest.java:
package com.sensor; import android.content.Context; import android.hardware.Sensor; import android.hardware.SensorEvent; import android.hardware.SensorEventListener; import android.hardware.SensorManager; import android.util.Log; public class SensorListenerTest implements SensorEventListener { private SensorManager mSensorManager; private Sensor sensor; private float mLastX, mLastY, mLastZ; private Context mContext; public SensorListenerTest(Context context) { mContext = context; // 在构造函数里面注册Sensor服务 enableSensor(); } // 注册传感器服务,在本java和Activity里面都要注册,但是取消注册的时候,只在activity里面取消注册即可。 public void enableSensor() { // 在这里真正注册Service服务 mSensorManager = (SensorManager) mContext .getSystemService(Context.SENSOR_SERVICE); sensor = mSensorManager.getDefaultSensor(Sensor.TYPE_ACCELEROMETER); if (mSensorManager == null) { Log.v("sensor..", "Sensors not supported"); } mSensorManager.registerListener(this, sensor, SensorManager.SENSOR_DELAY_NORMAL); } // 取消注册传感器服务 public void disableSensor() { if (mSensorManager != null) { mSensorManager.unregisterListener(this); mSensorManager = null; } } @Override public void onAccuracyChanged(Sensor arg0, int arg1) { // TODO Auto-generated method stub } @Override public void onSensorChanged(SensorEvent event) { // TODO Auto-generated method stub if (event.sensor == null) { return; } if (event.sensor.getType() == Sensor.TYPE_ACCELEROMETER) { mLastX = event.values[SensorManager.DATA_X]; mLastY = event.values[SensorManager.DATA_Y]; mLastZ = event.values[SensorManager.DATA_Z]; String sX = String.valueOf(mLastX); String sY = String.valueOf(mLastY); String sZ = String.valueOf(mLastZ); Log.v("mLastX==", sX); Log.v("mLastY==", sY); Log.v("mLastZ==", sZ); } } }
总结:在普通的java类里面,获得SensorManager的服务和具体的Sensor,不像在activity里面(不需要context作为参数,就可以直接获取),
所以用构造函数的context作为参数,让它获得SensorManager的服务和具体的Sensor,在activity里面,传递的context参数,不是像普通的java类那样定义一个context,而是传递this。这点需要注意。
【以上转自 :http://www.j2megame.com/html/xwzx/ty/2704.html】
有用参考:
Android教程之实现动作感应技术
4.SensorListener必须实现两个方法