Question

当我在模拟器上运行应用程序时，一切正常，但是当我在手机上运行应用程序（三星galaxy mini）时，我的应用程序崩溃（我不知道为什么，我确实打开了gps和互联网）。

代码：

public class atm_atmogan extends MapActivity {
    LocationManager mlocManager;
    LocationListener mlocListener;
    MapController mapController;
    MapView mapView;
    Location location;

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.atm_atmogan);

        mapView = (MapView) findViewById(R.id.map_view);
        mapView.setBuiltInZoomControls(true);
        mapView.setTraffic(true);
        mapView.invalidate();
        mapController = mapView.getController();
        mapController.setZoom(17);

        mlocManager = (LocationManager) this
                .getSystemService(Context.LOCATION_SERVICE);
        location = mlocManager
                .getLastKnownLocation(LocationManager.GPS_PROVIDER);
        mlocListener = new MyLocationListener();
        mlocManager.requestLocationUpdates(LocationManager.GPS_PROVIDER, 0, 0,
                mlocListener);
        mapController.animateTo(convertLoc(location));
    }

    public class MyLocationListener implements LocationListener {
        @Override
        public void onLocationChanged(Location loc) {
            location = loc;
        }

        @Override
        public void onProviderDisabled(String provider) {
            Toast.makeText(getApplicationContext(), "GPS OFF",
                    Toast.LENGTH_SHORT).show();
        }

        @Override
        public void onProviderEnabled(String provider) {
        }

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

convertLoc是我创建的用于将位置转换为 GeoPoint 的功能。

在真实设备上运行时更新Logcat：

at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1651)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1667)
at android.app.ActivityThread.access$1500(ActivityThread.java:117) 
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:935) 
at android.os.Handler.dispatchMessage(Handler.java:99) 
at android.os.Looper.loop(Looper.java:130) 
at android.app.ActivityThread.main(ActivityThread.java:3687) 
at java.lang.reflect.Method.invokeNative(Native Method) 
at java.lang.reflect.Method.invoke(Method.java:507) 
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:867)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:625) 
at dalvik.system.NativeStart.main(Native Method)  
Caused by: java.lang.NullPointerException 
at tim_atm.namespace.atm_atmogan.convertLoc(atm_atmogan.java:115) 
at tim_atm.namespace.atm_atmogan.onCreate(atm_atmogan.java:146) 
at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1047)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1615)
... 11 more

更新布局：

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:orientation="vertical" >

    <com.google.android.maps.MapView
        android:id="@+id/map_view"
        android:layout_width="fill_parent"
        android:layout_height="fill_parent"
        android:clickable="true"
        android:apiKey="0rMwFsILEdg4813dweucAH5iRKJHGozQs8FFvzQ" 

        />
</RelativeLayout>

Answer 1

请检查mlocManager.getLastKnownLocation()是否返回非空值。

Answer 2

GetLastKnownLocation不保证您将获得位置。您应该监听位置更改，然后将该位置用作备份计划。您可能希望使用其他参数尝试getLastKnownLocation。

此外，您可能希望删除Map API密钥;）

无法使用gps获取当前位置（App Crash）

2 个答案: