[英]Android: google maps into a fragment
我花了一些時間試圖使它起作用,並且在每個教程中我總是被卡在某個地方。 簡而言之,我正在嘗試制作一個選項卡式應用程序,其中Google所映射的選項卡之一。
我已修復所有常見錯誤:
我已經通過SDK下載了所有相關內容。
我有一個API密鑰。
我已將編譯com.google.android.gms:play-services:7.5.0
到我的依賴項中。
我正在嘗試遵循此代碼 ,但是我一直遇到錯誤。
我從logcat收到錯誤:
07-06 13:46:20.046 17948-17948/dolphin.dolphinapp E/AndroidRuntime﹕ FATAL EXCEPTION: main
Process: dolphin.dolphinapp, PID: 17948
java.lang.NullPointerException: IBitmapDescriptorFactory is not initialized
at com.google.android.gms.common.internal.zzu.zzb(Unknown Source)
at com.google.android.gms.maps.model.BitmapDescriptorFactory.zzvH(Unknown Source)
at com.google.android.gms.maps.model.BitmapDescriptorFactory.defaultMarker(Unknown Source)
at dolphin.dolphinapp.MainActivity$MapFragment.onCreateView(MainActivity.java:655)
at android.support.v4.app.Fragment.performCreateView(Fragment.java:1789)
at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:955)
at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:1138)
at android.support.v4.app.BackStackRecord.run(BackStackRecord.java:740)
at android.support.v4.app.FragmentManagerImpl.execPendingActions(FragmentManager.java:1501)
at android.support.v4.app.FragmentManagerImpl.executePendingTransactions(FragmentManager.java:490)
at android.support.v4.app.FragmentPagerAdapter.finishUpdate(FragmentPagerAdapter.java:141)
at android.support.v4.view.ViewPager.populate(ViewPager.java:1105)
at android.support.v4.view.ViewPager.setCurrentItemInternal(ViewPager.java:551)
at android.support.v4.view.ViewPager.setCurrentItemInternal(ViewPager.java:513)
at android.support.v4.view.ViewPager.setCurrentItem(ViewPager.java:494)
at dolphin.dolphinapp.MainActivity.onTabSelected(MainActivity.java:152)
at android.support.v7.internal.app.WindowDecorActionBar.selectTab(WindowDecorActionBar.java:640)
at android.support.v7.internal.app.WindowDecorActionBar$TabImpl.select(WindowDecorActionBar.java:1224)
at android.support.v7.internal.widget.ScrollingTabContainerView$TabClickListener.onClick(ScrollingTabContainerView.java:568)
at android.view.View.performClick(View.java:4780)
at android.view.View$PerformClick.run(View.java:19866)
at android.os.Handler.handleCallback(Handler.java:739)
at android.os.Handler.dispatchMessage(Handler.java:95)
at android.os.Looper.loop(Looper.java:135)
at android.app.ActivityThread.main(ActivityThread.java:5257)
at java.lang.reflect.Method.invoke(Native Method)
at java.lang.reflect.Method.invoke(Method.java:372)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:903)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:698)
顯然要解決此問題,請寫MapsInitializer.initialize(getActivity().getApplicationContext());
,但這已經在我復制的代碼中。
這是我的Java代碼:
public class MapFragment extends Fragment {
MapView mMapView;
private GoogleMap googleMap;
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
// inflat and return the layout
View v = inflater.inflate(R.layout.fragment_location_info, container,
false);
mMapView = (MapView) v.findViewById(R.id.mapView);
mMapView.onCreate(savedInstanceState);
mMapView.onResume();// needed to get the map to display immediately
try {
MapsInitializer.initialize(getActivity().getApplicationContext());
} catch (Exception e) {
e.printStackTrace();
}
MapsInitializer.initialize(getApplicationContext());
googleMap = mMapView.getMap();
// latitude and longitude
double latitude = 17.385044;
double longitude = 78.486671;
// create marker
MarkerOptions marker = new MarkerOptions().position(new LatLng(latitude, longitude)).title("Hello Maps");
// Changing marker icon
marker.icon(BitmapDescriptorFactory.defaultMarker(BitmapDescriptorFactory.HUE_ROSE));
// adding marker
googleMap.addMarker(marker);
CameraPosition cameraPosition = new CameraPosition.Builder().target(new LatLng(17.385044, 78.486671)).zoom(12).build();
googleMap.animateCamera(CameraUpdateFactory.newCameraPosition(cameraPosition));
// Perform any camera updates here
return v;
}
@Override
public void onResume() {
super.onResume();
mMapView.onResume();
}
@Override
public void onPause() {
super.onPause();
mMapView.onPause();
}
@Override
public void onDestroy() {
super.onDestroy();
mMapView.onDestroy();
}
@Override
public void onLowMemory() {
super.onLowMemory();
mMapView.onLowMemory();
}
}
我的XML文件:
<?xml version="1.0" encoding="utf-8"?>
<com.google.android.gms.maps.MapView
xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/mapView"
android:layout_width="match_parent"
android:layout_height="match_parent" />
請讓我知道我做錯了
您應該在onCreateView
調用mMapView.getMapAsync()
,然后在實現的onMapReady
回調中執行MapsInitializer.initialize(this.context);
mMapView.getMapAsync(new OnMapReadyCallback() {
@Override
public void onMapReady(GoogleMap googleMap) {
MapsInitializer.initialize(getApplicationContext());
// latitude and longitude
double latitude = 17.385044;
double longitude = 78.486671;
// create marker
MarkerOptions marker = new MarkerOptions().position(new LatLng(latitude, longitude)).title("Hello Maps");
// Changing marker icon
marker.icon(BitmapDescriptorFactory.defaultMarker(BitmapDescriptorFactory.HUE_ROSE));
}
});
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