小编Ale*_*lex的帖子

嗨我在使用gps的应用程序上工作我的测试设备是Nexus One和Htc Mytouch 3g Slide

那么有谁知道如何提高gps准确度？

我正在尝试进行查询以确定Postgres数据库中地理定位点之间的距离这是我的查询

SELECT latitude, longitude, SQRT(
POW(69.1 * (latitude - 31.8679), 2) +
POW(69.1 * (-116.6567 - longitude) * COS(latitude / 57.3), 2)) AS distance
FROM locations 
HAVING distance < 25 
ORDER BY distance

但它给了我这个错误

错误:列"距离"不存在第5行:距离<25

如果我删除部分"HAVING distance <25",则查询运行正常

我有一个名为catObras的实体类,它继承自NSManagedObject类.我想要做的是通过JSON格式的Web服务(POST)传递它.如果我发送了这个对象,我会收到:

<catObras: 0x6d879f0> (entity: catObras; id: 0x6d859b0 <x-coredata://41B60B06-248C-488D-A14C-894E04D0395F/catObras/p2> ; data: {
Reporte = "<relationship fault: 0x6d9dc40 'Reporte'>";
calendarioVisitas = "<relationship fault: 0x6dac2c0 'calendarioVisitas'>";
catFondosInversion = "<relationship fault: 0x6d7a1b0 'catFondosInversion'>";
contratista = nil;
contrato = "XX-AYTO-ENS-BC-HABITAT-2011-IS-01";
descripcion = "AMPLIACION DE RED DE DRENAJE SANITARIO COL. VISTA HERMOSA";
direccion = nil;
estatus = nil;
fechaAprobacion = "2012-01-01 08:00:00 +0000";
fechaInicio = "2012-01-31 08:00:00 +0000";
fechaTerminacion = "2012-03-10 08:00:00 +0000";
fechaUltimoRep = nil;
idAgrupacion = 0;
idObra = 5;
inversionAprobada = 0;
inversionAutorizada …

以下代码适用于Android 4,但在Android 2中导致IllegalArgumentException.

有线索吗？

Locale currentLocale = new Locale("en_UK"); 
final BreakIterator boundary = BreakIterator.getSentenceInstance(currentLocale);
boundary.setText("a"); 
int thisThrowsExceptionInVersion2 = boundary.preceding(1);

例外:

08-08 22:29:14.414: E/AndroidRuntime(329): Caused by: java.lang.IllegalArgumentException
08-08 22:29:14.414: E/AndroidRuntime(329):  at java.text.RuleBasedBreakIterator.validateOffset(RuleBasedBreakIterator.java:74)
08-08 22:29:14.414: E/AndroidRuntime(329):  at java.text.RuleBasedBreakIterator.preceding(RuleBasedBreakIterator.java:158)
08-08 22:29:14.414: E/AndroidRuntime(329):  at kalle.palle.namespace.KallePalleActivity.onCreate(KallePalleActivity.java:26)

我正在使用Facebook SDK for Android 3.0,我想要做的是得到10张朋友的照片.如何将limit参数添加到请求中？

for (GraphUser user : users) {
  Request request = Request.newGraphPathRequest(
    session,user.getId()+"/photos",new Request.Callback(){...});

  //requests is a collection of requests
  requests.add(request);
}
Request.executeBatchAsync(requests);