positioninglistener.java

来自「主要用于基站定位的java实现」· Java 代码 · 共 82 行

/*
 * PositioningListener.java
 *
 */
package com.sonyericsson.example;

import javax.microedition.location.Location;
import javax.microedition.location.LocationListener;
import javax.microedition.location.LocationProvider;

/**
 *
 */
public class PositioningListener implements LocationListener {

  private Location currentLocation = null;
  private int currentState = 0;
  private static final Object STATE_LOCK = new Object();
  private static final Object LOCATION_LOCK = new Object();
  private boolean locationUpdated = false;
  private boolean stateUpdated = false;

  public PositioningListener() {
  }

  public String getStateString() {
    return Utils.getStateString(currentState);
  }

  public Location getCurrentLocation() {
    synchronized (LOCATION_LOCK) {
      return currentLocation;
    }
  }

  public Location waitForLocation() {
    synchronized (LOCATION_LOCK) {
      try {
        while (!locationUpdated) {
          LOCATION_LOCK.wait();
        }
        locationUpdated = false; // reset flag
      } catch (InterruptedException i) {
        i.printStackTrace();
      }
      return currentLocation;
    }
  }

  public int waitForStateChange() {
    synchronized (STATE_LOCK) {
      try {
        while (!stateUpdated) {
          STATE_LOCK.wait();
        }
        stateUpdated = false; // reset flag
      } catch (InterruptedException i) {
        i.printStackTrace();
      }
    }
    return currentState;
  }

  public void providerStateChanged(LocationProvider locationProvider, int i) {
    synchronized (STATE_LOCK) {
      currentState = i;
      stateUpdated = true;
      STATE_LOCK.notifyAll();
    }
  }

  public void locationUpdated(LocationProvider locationProvider, Location location) {
    synchronized (LOCATION_LOCK) {
      currentLocation = location;
      locationUpdated = true;
      LOCATION_LOCK.notifyAll();
    }
  }
}