Android 检查GPS可访问性
我想检查一下,设备是否从卫星获取数据。 如果我得到了我现在的位置,那么我会做点什么。否则,如果我还没有任何坐标,我想给我留言。 我怎么知道,我是否已经得到了坐标Android 检查GPS可访问性,android,gps,satellite,Android,Gps,Satellite,我想检查一下,设备是否从卫星获取数据。 如果我得到了我现在的位置,那么我会做点什么。否则,如果我还没有任何坐标,我想给我留言。 我怎么知道,我是否已经得到了坐标 GeoPoint h = null; double latitude = 10, longitude = 10; public void onClick(View v) { switch (v.getId()) { case R.id.get_GPS: final LocationMan
GeoPoint h = null;
double latitude = 10, longitude = 10;
public void onClick(View v)
{
switch (v.getId())
{
case R.id.get_GPS:
final LocationManager manager = (LocationManager) getSystemService( Context.LOCATION_SERVICE );
if(isInternetOn() && manager.isProviderEnabled(LocationManager.GPS_PROVIDER))
{
//I want here to check, if I get latitude and longitude values, which differ from 10 x 10, I go to my map, otherwise I say, that there's no information received from satellite.
/*
h = new GeoPoint((int) (latitude * 1000000), (int) (longitude * 1000000));
if(h.getLatitudeE6()==h.getLongitudeE6() && h.getLongitudeE6()==10000000)
{
Toast.makeText(this, "No information received from satellite yet.", Toast.LENGTH_LONG).show();
break;
}
*/
Intent i = new Intent (this,getGPS.class);
startActivity(i);
}
else
{
if(!isInternetOn() && !manager.isProviderEnabled( LocationManager.GPS_PROVIDER))
{
buildAlertMessageNoGpsNoInternet();
break;
}
if(!isInternetOn())
{
buildAlertMessageNoInternet();
break;
}
if(!manager.isProviderEnabled( LocationManager.GPS_PROVIDER))
{
buildAlertMessageNoGps();
break;
}
}
break;
case R.id.about_button:
Intent j = new Intent(this, About.class);
startActivity(j);
break;
case R.id.exit_button:
this.moveTaskToBack(true);
break;
}
}
Sam,“如果”中出现空指针异常:
Logcat
05-05 11:42:49.444:E/AndroidRuntime(300):java.lang.NullPointerException我会尝试以下方法:
public class Example extends Activity {
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
LocationManager manager = (LocationManager) getSystemService(Context.LOCATION_SERVICE);
Location location = manager.getLastKnownLocation(LocationManager.GPS_PROVIDER);
if(location.getTime() > Calendar.getInstance().getTimeInMillis() - 2 * 60 * 1000) {
// Do something with the recent location fix
}
else {
// Wait for new location
LocationListener locationListener = new myLocationListener();
manager.requestLocationUpdates(LocationManager.GPS_PROVIDER, 0, 0,locationListener);
}
}
private class myLocationListener implements LocationListener {
public void onLocationChanged(Location location) {
if (location != null) {
Log.v("Location Changed", location.getLatitude() + " " + location.getLongitude());
// Do something with current location
}
}
// Must implement missing functions!
}
}
添加
如果location在这里为null,则可能意味着无论出于何种原因,都不存在最后一个已知的位置。简单修复:
if(location != null && location.getTime() > ((Calendar.getInstance().getTimeInMillis()) - 10000))
我会尝试这样做:
public class Example extends Activity {
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
LocationManager manager = (LocationManager) getSystemService(Context.LOCATION_SERVICE);
Location location = manager.getLastKnownLocation(LocationManager.GPS_PROVIDER);
if(location.getTime() > Calendar.getInstance().getTimeInMillis() - 2 * 60 * 1000) {
// Do something with the recent location fix
}
else {
// Wait for new location
LocationListener locationListener = new myLocationListener();
manager.requestLocationUpdates(LocationManager.GPS_PROVIDER, 0, 0,locationListener);
}
}
private class myLocationListener implements LocationListener {
public void onLocationChanged(Location location) {
if (location != null) {
Log.v("Location Changed", location.getLatitude() + " " + location.getLongitude());
// Do something with current location
}
}
// Must implement missing functions!
}
}
添加
如果location在这里为null,则可能意味着无论出于何种原因,都不存在最后一个已知的位置。简单修复:
if(location != null && location.getTime() > ((Calendar.getInstance().getTimeInMillis()) - 10000))
请发布您尝试过的任何logcat错误,否则《开发人员指南》是一个很好的开始。@Sam,没有错误。只需获取循环toast。请发布您尝试过的任何logcat错误,否则上的开发人员指南是一个很好的开始。@Sam,没有错误。去吃烤面包。