如何摆脱Android中的缓存位置

如何摆脱Android中的缓存位置,android,caching,gps,location,android-location,Android,Caching,Gps,Location,Android Location,正如你可以在谷歌的位置策略页面中看到的,一旦读取存储在缓存中,该位置就会出现(附图片供快速参考) 正如您所看到的,该位置被缓存,并且由于太旧而被丢弃。我不想用这个缓存。如何禁用它,以便每次Google侦听和检索新位置时(我不关心电池,只关心更准确的位置)将您以前的位置与onLocationChanged()方法中的新位置进行比较,如下所示: Location prevLocation=null; private static final int TWO_MINUTES = 1000 * 60 *

正如你可以在谷歌的位置策略页面中看到的,一旦读取存储在缓存中,该位置就会出现(附图片供快速参考)


正如您所看到的,该位置被缓存,并且由于太旧而被丢弃。我不想用这个缓存。如何禁用它,以便每次Google侦听和检索新位置时(我不关心电池,只关心更准确的位置)

将您以前的位置与onLocationChanged()方法中的新位置进行比较,如下所示:

Location prevLocation=null;
private static final int TWO_MINUTES = 1000 * 60 * 2; // time difference between location updates

// Define a listener that responds to location updates
LocationListener locationListener = new LocationListener() {

   //calls everytime when new location updates found
   public void onLocationChanged(Location location) {
     // Called when a new location is found by the network location provider.
      if(isBetterLocation(location, getPrevLocation())){

           // write your logic to use of new location

           // set your new location to prevlocation
           setPrevLocation(location);
      }

   }

   public void onStatusChanged(String provider, int status, Bundle extras) {}

   public void onProviderEnabled(String provider) {}

   public void onProviderDisabled(String provider) {}
};

/** Determines whether one Location reading is better than the current Location fix
* @param location  The new Location that you want to evaluate
* @param currentBestLocation  The current Location fix, to which you want to compare the    new one
*/
 protected boolean isBetterLocation(Location location, Location currentBestLocation) {
 if (currentBestLocation == null) {
    // A new location is always better than no location
    return true;
 }

// Check whether the new location fix is newer or older
long timeDelta = location.getTime() - currentBestLocation.getTime();
boolean isSignificantlyNewer = timeDelta > TWO_MINUTES;
boolean isSignificantlyOlder = timeDelta < -TWO_MINUTES;
boolean isNewer = timeDelta > 0;

// If it's been more than two minutes since the current location, use the new location
// because the user has likely moved
if (isSignificantlyNewer) {
    return true;
// If the new location is more than two minutes older, it must be worse
} else if (isSignificantlyOlder) {
    return false;
}

// Check whether the new location fix is more or less accurate
int accuracyDelta = (int) (location.getAccuracy() - currentBestLocation.getAccuracy());
boolean isLessAccurate = accuracyDelta > 0;
boolean isMoreAccurate = accuracyDelta < 0;
boolean isSignificantlyLessAccurate = accuracyDelta > 200;

// Check if the old and new location are from the same provider
boolean isFromSameProvider = isSameProvider(location.getProvider(),
        currentBestLocation.getProvider());

// Determine location quality using a combination of timeliness and accuracy
if (isMoreAccurate) {
    return true;
} else if (isNewer && !isLessAccurate) {
    return true;
} else if (isNewer && !isSignificantlyLessAccurate && isFromSameProvider) {
    return true;
}
return false;
}

/** Checks whether two providers are the same */
private boolean isSameProvider(String provider1, String provider2) {
 if (provider1 == null) {
   return provider2 == null;
 }
 return provider1.equals(provider2);
 }

public void setPrevLocation(Location prevLocation){
  this.prevLocation=prevLocation;
}
public Location getPrevLocation(){
 return prevLocation;
}
Location prevLocation=null;
专用静态最终整数两分钟=1000*60*2;//位置更新之间的时间差
//定义响应位置更新的侦听器
LocationListener LocationListener=新LocationListener(){
//每次发现新位置更新时调用
已更改位置上的公共无效(位置){
//当网络位置提供程序找到新位置时调用。
if(isBetterLocation(location,getPrevLocation())){
//编写使用新位置的逻辑
//将新位置设置为prevlocation
设置位置(位置);
}
}
public void onStatusChanged(字符串提供程序、int状态、Bundle extra){}
公共无效onProviderEnabled(字符串提供程序){}
公共无效onProviderDisabled(字符串提供程序){}
};
/**确定一个位置读取是否优于当前位置修复
*@param location要计算的新位置
*@param currentBestLocation当前位置修复程序,您要将新位置修复程序与之进行比较
*/
受保护的布尔值isBetterLocation(位置位置,位置currentBestLocation){
如果(currentBestLocation==null){
//新位置总比没有位置好
返回true;
}
//检查新的位置修复程序是较新的还是较旧的
long-timeDelta=location.getTime()-currentBestLocation.getTime();
布尔值isSignificantlyNewer=时间增量>两分钟;
布尔值Issignificantlolder=时间增量<-2_分钟;
布尔值isNewer=timeDelta>0;
//如果距离当前位置已超过两分钟,请使用新位置
//因为用户可能已经移动了
如果(非常重要){
返回true;
//如果新位置比原来的位置早两分钟以上,情况肯定会更糟
}else if(Issignificantlolder){
返回false;
}
//检查新的位置修复是否更精确
int accuracyDelta=(int)(location.getAccuracy()-currentBestLocation.getAccuracy());
布尔值IslesAccurate=accuracyDelta>0;
布尔值IsmorePrecision=精度偏差<0;
布尔值不太精确=精度偏差>200;
//检查新旧位置是否来自同一提供商
布尔值isFromSameProvider=isSameProvider(location.getProvider(),
currentBestLocation.getProvider());
//结合及时性和准确性确定定位质量
如果(更准确){
返回true;
}else if(isNewer&!islesAccurate){
返回true;
}else if(较新且不太准确且来自SameProvider){
返回true;
}
返回false;
}
/**检查两个提供程序是否相同*/
专用布尔值isSameProvider(字符串提供程序1、字符串提供程序2){
if(provider1==null){
返回provider2==null;
}
返回provider1.equals(provider2);
}
公共无效设置prevLocation(位置prevLocation){
this.prevLocation=prevLocation;
}
公共位置getPrevLocation(){
返回位置;
}