android谷歌地图中的空指针异常
我正在尝试将谷歌地图添加到我的应用程序中。 logcat窗口显示此错误： 由android.app.Activity.performCreate（Activity.java:5104）中com.example.mymaps.MainActivity.onCreate（MainActivity.java:27）处的java.lang.NullPointerException引起 位于android.app.Instrumentation.callActivityOnCreate（Instrumentation.java:1080） 如何删除此错误android谷歌地图中的空指针异常,android,google-maps,nullpointerexception,mapfragment,Android,Google Maps,Nullpointerexception,Mapfragment,我正在尝试将谷歌地图添加到我的应用程序中。 logcat窗口显示此错误： 由android.app.Activity.performCreate（Activity.java:5104）中com.example.mymaps.MainActivity.onCreate（MainActivity.java:27）处的java.lang.NullPointerException引起 位于android.app.Instrumentation.callActivityOnCreate（Instrumen
Main xml:
<RelativeLayout
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".MainActivity" >
<fragment
android:id="@+id/map"
android:layout_width="match_parent"
android:layout_height="match_parent"
class="com.google.android.gms.maps.MapFragment" />
</RelativeLayout>
8-13 23:32:27.279:E/AndroidRuntime（1010）：。。。11更多可能是由于播放服务问题。所以在使用map之前，空检查map对象，这样它就会自动请求在设备中下载map。请尝试并回复
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
map = ((MapFragment) getFragmentManager().findFragmentById(R.id.map))
.getMap();
if(map!=null){
Marker hamburg = map.addMarker(new MarkerOptions().position(HAMBURG)
.title("Hamburg"));
Marker kiel = map.addMarker(new MarkerOptions()
.position(KIEL)
.title("Kiel")
.snippet("Kiel is cool")
.icon(BitmapDescriptorFactory
.fromResource(R.drawable.ic_launcher)));
// Move the camera instantly to hamburg with a zoom of 15.
map.moveCamera(CameraUpdateFactory.newLatLngZoom(HAMBURG, 15));
// Zoom in, animating the camera.
map.animateCamera(CameraUpdateFactory.zoomTo(10), 2000, null);
}
}
这可能是由于播放服务问题。所以在使用map之前，空检查map对象，这样它就会自动请求在设备中下载map。请尝试并回复
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
map = ((MapFragment) getFragmentManager().findFragmentById(R.id.map))
.getMap();
if(map!=null){
Marker hamburg = map.addMarker(new MarkerOptions().position(HAMBURG)
.title("Hamburg"));
Marker kiel = map.addMarker(new MarkerOptions()
.position(KIEL)
.title("Kiel")
.snippet("Kiel is cool")
.icon(BitmapDescriptorFactory
.fromResource(R.drawable.ic_launcher)));
// Move the camera instantly to hamburg with a zoom of 15.
map.moveCamera(CameraUpdateFactory.newLatLngZoom(HAMBURG, 15));
// Zoom in, animating the camera.
map.animateCamera(CameraUpdateFactory.zoomTo(10), 2000, null);
}
}
null非nullIf(gMap!=null)
nullonCreateStrictMode.ThreadPolicy policy = new StrictMode.ThreadPolicy.Builder().permitAll().build();
StrictMode.setThreadPolicy(policy);
null非nullIf(gMap!=null)
nullonCreateStrictMode.ThreadPolicy policy = new StrictMode.ThreadPolicy.Builder().permitAll().build();
StrictMode.setThreadPolicy(policy);
您的
onCreateonCreate