E/AndroidRuntime: FATAL EXCEPTION: main at dalvik.system.NativeStart.main(Native Method) crash答案

【问题标题】：E/AndroidRuntime: FATAL EXCEPTION: main at dalvik.system.NativeStart.main(Native Method) crashE/AndroidRuntime: FATAL EXCEPTION: main at dalvik.system.NativeStart.main(Native Method) crash
【发布时间】：2016-02-11 12:21:13
【问题描述】：

对于Android，使用Android Studio 2.0 这是我的代码

package com.innovapp.maptest;

import android.location.Location;
import android.support.v4.app.FragmentActivity;
import android.os.Bundle;

import com.google.android.gms.maps.CameraUpdateFactory;
import com.google.android.gms.maps.GoogleMap;
import com.google.android.gms.maps.OnMapReadyCallback;
import com.google.android.gms.maps.SupportMapFragment;
import com.google.android.gms.maps.model.LatLng;
import com.google.android.gms.maps.model.MarkerOptions;

public class MapsActivity extends FragmentActivity implements OnMapReadyCallback {

private GoogleMap mMap;

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_maps);
// Obtain the SupportMapFragment and get notified when the map is ready to be used.
mapFragment = (SupportMapFragment) getSupportFragmentManager()
.findFragmentById(R.id.map);
mapFragment.getMapAsync(this);
}

@Override
public void onMapReady(GoogleMap googleMap) {
mMap = googleMap;
mMap.setMyLocationEnabled(true);
Location myLocation = new Location(mMap.getMyLocation());

LatLng myLatLng = new LatLng(myLocation.getLatitude(),myLocation.getLongitude());
mMap.addMarker(new MarkerOptions().position(myLatLng).title("Your Location"+myLocation.getAccuracy()));
mMap.moveCamera(CameraUpdateFactory.newLatLng(myLatLng));
}
}

这是我的堆栈跟踪

E/AndroidRuntime: FATAL EXCEPTION: main
Process: com.innovapp.maptest, PID: 14690
java.lang.NullPointerException
at android.location.Location.set(Location.java:130)
at android.location.Location.<init>(Location.java:123)
at com.innovapp.maptest.MapsActivity.onMapReady(MapsActivity.java:32)
at com.google.android.gms.maps.SupportMapFragment$zza$1.zza(Unknown Source)
at com.google.android.gms.maps.internal.zzo$zza.onTransact(Unknown Source)
at android.os.Binder.transact(Binder.java:361)
at com.google.android.gms.maps.internal.be.a(SourceFile:82)
at com.google.maps.api.android.lib6.e.fb.run(Unknown Source)
at android.os.Handler.handleCallback(Handler.java:733)
at android.os.Handler.dispatchMessage(Handler.java:95)
at android.os.Looper.loop(Looper.java:136)
at android.app.ActivityThread.main(ActivityThread.java:5052)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:515)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:793)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:609)
at dalvik.system.NativeStart.main(Native Method)

谁能帮我弄清楚为什么会出现这个异常？

还有

据我了解，getMyLocation() 已弃用，那么我现在应该使用什么来保留我的代码的功能？

【问题讨论】：

标签： java android exception crash

【解决方案1】：

Map.getMyLocation() 可以返回 null，因此您应该在调用 getLatitude() 之前先检查它。另外，当您使用地图时，我建议您实现 onLocationChangeListener 并在此方法中初始化您的地图

【讨论】：

【解决方案2】：

使用

 MapsActivity extends FragmentActivity implements OnMapReadyCallback,
        GoogleApiClient.ConnectionCallbacks, GoogleApiClient.OnConnectionFailedListener,
        LocationListener{}

OnCreate 写入

MapFragment mapFragment = (MapFragment) getFragmentManager()
                .findFragmentById(R.id.idMap);
        mapFragment.getMapAsync(context);

检查 this

【讨论】：