Android 我能';t访问我所在位置的纬度和经度。为什么?
我想计算两点之间的距离,但当我使用.distance to函数时,程序出现错误,并说android.location.location与同一文件中定义的类型冲突。我用数学规则计算距离,但当我给出我所在位置的纬度和经度时,当程序运行时,程序停止了。为什么?我很困惑Android 我能';t访问我所在位置的纬度和经度。为什么?,android,map,error-handling,Android,Map,Error Handling,我想计算两点之间的距离,但当我使用.distance to函数时,程序出现错误,并说android.location.location与同一文件中定义的类型冲突。我用数学规则计算距离,但当我给出我所在位置的纬度和经度时,当程序运行时,程序停止了。为什么?我很困惑 public class Location extends MapActivity { double myLatitude=0; double myLongitude=0; @Override public void onCreate(
public class Location extends MapActivity {
double myLatitude=0;
double myLongitude=0;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.location);
initMapView();
initMyLocation();
}
private void initMyLocation() {
final MyLocationOverlay overlay = new MyLocationOverlay(this, map);
overlay.enableMyLocation();
overlay.enableCompass();
//
mylocation=overlay.getMyLocation();
overlay.runOnFirstFix(new Runnable() {
public void run() {
controller.setZoom(13);
controller.animateTo(overlay.getMyLocation());
}
});
//THIS is ERROR . WHY?
myLatitude=(overlay.getMyLocation().getLatitudeE6())/1e6;
myLongitude=(overlay.getMyLocation().getLongitudeE6())/1e6;
}
}
日志:
11-12 15:29:57.974: W/dalvikvm(688): threadid=1: thread exiting with uncaught exception (group=0x40a891f8)
11-12 15:29:57.982: E/AndroidRuntime(688): FATAL EXCEPTION: main
11-12 15:29:57.982: E/AndroidRuntime(688): java.lang.RuntimeException: Unable to start activity ComponentInfo{org.example.loyaltier/org.example.loyaltier.Location}: java.lang.NullPointerException
11-12 15:29:57.982: E/AndroidRuntime(688): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1955)
11-12 15:29:57.982: E/AndroidRuntime(688): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1980)
11-12 15:29:57.982: E/AndroidRuntime(688): at android.app.ActivityThread.access$600(ActivityThread.java:122)
11-12 15:29:57.982: E/AndroidRuntime(688): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1146)
11-12 15:29:57.982: E/AndroidRuntime(688): at android.os.Handler.dispatchMessage(Handler.java:99)
11-12 15:29:57.982: E/AndroidRuntime(688): at android.os.Looper.loop(Looper.java:137)
11-12 15:29:57.982: E/AndroidRuntime(688): at android.app.ActivityThread.main(ActivityThread.java:4340)
11-12 15:29:57.982: E/AndroidRuntime(688): at java.lang.reflect.Method.invokeNative(Native Method)
11-12 15:29:57.982: E/AndroidRuntime(688): at java.lang.reflect.Method.invoke(Method.java:511)
11-12 15:29:57.982: E/AndroidRuntime(688): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:784)
11-12 15:29:57.982: E/AndroidRuntime(688): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:551)
11-12 15:29:57.982: E/AndroidRuntime(688): at dalvik.system.NativeStart.main(Native Method)
11-12 15:29:57.982: E/AndroidRuntime(688): Caused by: java.lang.NullPointerException
11-12 15:29:57.982: E/AndroidRuntime(688): at org.example.loyaltier.Location.initMyLocation(Location.java:164)
11-12 15:29:57.982: E/AndroidRuntime(688): at org.example.loyaltier.Location.onCreate(Location.java:61)
11-12 15:29:57.982: E/AndroidRuntime(688): at android.app.Activity.performCreate(Activity.java:4465)
11-12 15:29:57.982: E/AndroidRuntime(688): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1049)
11-12 15:29:57.982: E/AndroidRuntime(688): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1919)
11-12 15:29:57.982: E/AndroidRuntime(688): ... 11 more
谢谢。干杯您的位置为空请使用下面的代码
if(mylocation!= null)
{
myLatitude=(overlay.getMyLocation().getLatitudeE6())/1e6;
myLongitude=(overlay.getMyLocation().getLongitudeE6())/1e6;
}
已经有一个名为Location的类
将其重命名为
MyLocation
或其他方法可以解决此问题。您正在运行模拟器吗?嘿,我想您应该先更改类的名称。把它改成“MyLocation”或者别的什么,因为位置已经在Android API中了。我在手机上运行这个程序。