GIS的学习（四十三）osmdroid基于几个经典代理类
?? 在osmdroid中给基于位置的代理类如下：
package org.osmdroid;import android.location.Location;import android.location.LocationListener;import android.location.LocationManager;import android.os.Bundle;public class LocationListenerProxy implements LocationListener {private final LocationManager mLocationManager;private LocationListener mListener = null;public LocationListenerProxy(final LocationManager pLocationManager) {mLocationManager = pLocationManager;}public boolean startListening(final LocationListener pListener, final long pUpdateTime,final float pUpdateDistance) {boolean result = false;mListener = pListener;for (final String provider : mLocationManager.getProviders(true)) {if (LocationManager.GPS_PROVIDER.equals(provider)|| LocationManager.NETWORK_PROVIDER.equals(provider)) {result = true;mLocationManager.requestLocationUpdates(provider, pUpdateTime, pUpdateDistance,this);}}return result;}public void stopListening() {mListener = null;mLocationManager.removeUpdates(this);}@Overridepublic void onLocationChanged(final Location arg0) {if (mListener != null) {mListener.onLocationChanged(arg0);}}@Overridepublic void onProviderDisabled(final String arg0) {if (mListener != null) {mListener.onProviderDisabled(arg0);}}@Overridepublic void onProviderEnabled(final String arg0) {if (mListener != null) {mListener.onProviderEnabled(arg0);}}@Overridepublic void onStatusChanged(final String arg0, final int arg1, final Bundle arg2) {if (mListener != null) {mListener.onStatusChanged(arg0, arg1, arg2);}}}?
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获取当前的位置：
package org.osmdroid.util;import org.osmdroid.util.constants.UtilConstants;import android.location.Location;import android.location.LocationManager;public class LocationUtils implements UtilConstants {/** * This is a utility class with only static members. */private LocationUtils() {}/** * Get the most recent location from the GPS or Network provider. * @param pLocationManager * @return return the most recent location, or null if there's no known location */public static Location getLastKnownLocation(final LocationManager pLocationManager) {if (pLocationManager == null) {return null;}final Location gpsLocation =pLocationManager.getLastKnownLocation(LocationManager.GPS_PROVIDER);final Location networkLocation =pLocationManager.getLastKnownLocation(LocationManager.NETWORK_PROVIDER);if (gpsLocation == null) {return networkLocation;} else if (networkLocation == null) {return gpsLocation;} else {// both are non-null - use the most recentif (networkLocation.getTime() > gpsLocation.getTime() + GPS_WAIT_TIME) {return networkLocation;} else {return gpsLocation;}}}}?
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具体的使用如下：
启动时候：
???mLocationListener = new LocationListenerProxy(mLocationManager);
???result = mLocationListener.startListening(this, mLocationUpdateMinTime,
?????mLocationUpdateMinDistance);
停止时候：
??if (mLocationListener != null) {
???mLocationListener.stopListening();
??}
??mLocationListener = null;
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针对指南针使用的感应事件代理：
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package org.osmdroid;import android.hardware.Sensor;import android.hardware.SensorEvent;import android.hardware.SensorEventListener;import android.hardware.SensorManager;public class SensorEventListenerProxy implements SensorEventListener {private final SensorManager mSensorManager;private SensorEventListener mListener = null;public SensorEventListenerProxy(final SensorManager pSensorManager) {mSensorManager = pSensorManager;}public boolean startListening(final SensorEventListener pListener, final int pSensorType,final int pRate) {final Sensor sensor = mSensorManager.getDefaultSensor(pSensorType);if (sensor == null)return false;mListener = pListener;return mSensorManager.registerListener(this, sensor, pRate);}public void stopListening() {mListener = null;mSensorManager.unregisterListener(this);}@Overridepublic void onAccuracyChanged(final Sensor pSensor, final int pAccuracy) {if (mListener != null) {mListener.onAccuracyChanged(pSensor, pAccuracy);}}@Overridepublic void onSensorChanged(final SensorEvent pEvent) {if (mListener != null) {mListener.onSensorChanged(pEvent);}}}?
使用时：
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??if (mSensorListener == null) {
???mSensorListener = new SensorEventListenerProxy(mSensorManager);
???result = mSensorListener.startListening(this, Sensor.TYPE_ORIENTATION,
?????SensorManager.SENSOR_DELAY_UI);
??}
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if (mSensorListener != null) {mSensorListener.stopListening();}// Reset valuesmSensorListener = null;?
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