java如何在片段中使用谷歌地图视图？
期望的行为
如果它影响到任何答案或建议，我希望最终在这个应用程序中看到的是一个导航UI，其中一个Fragment是一个地图。我使用一个模板以一个导航UI开始，它给了我几个Fragment，每个选项卡一个。目前，我正在尝试使用Google API在其中一个Fragment中放置一个MapView
当前行为
一般来说，这是行不通的（显然）。我已经启动并运行了一切，但当我打开带有地图的选项卡时，地图是空白的。没有崩溃，也没有输出错误：
I/Google Maps Android API: Google Play services client version: 12451000
I/Google Maps Android API: Google Play services package version: 201516040
D/NetworkSecurityConfig: No Network Security Config specified, using platform default
I/DynamiteModule: Considering local module com.google.安卓.gms.googlecertificates:0 and remote module com.google.安卓.gms.googlecertificates:4
Selected remote version of com.google.安卓.gms.googlecertificates, version >= 4
其他详细信息/故障排除
我知道我的API密钥可以工作，因为我有另一个应用程序，其中的地图可以按预期工作。我怀疑我是否需要第二个API密钥，但我还是看了看，因为如何创建第二个API密钥并不太明显，我认为直觉是正确的。我使用的大部分代码都是从那个工作示例中复制的；主要区别在于，其他示例使用了SupportMapFragment，并且它有一个class MapsActivity extends FragmentActivity。在这里，因为我不想处理嵌套片段，所以我尝试在片段内部使用MapView
我的代码中没有被复制的部分主要来自在线资源。我所做的一切都没有产生更好的效果
MapView inside fragment回答了一个不同的问题
Creating google maps v2 in a fragment using Navigation Drawer只包含我已经拥有的东西
安卓 MapView in Fragment给了我使用MapsInitializer.initialize(this.getActivity());的想法，但那没有帮助
Mapview in separate fragment 安卓没有什么新鲜事
how do i solve integrating google map in fragment in 安卓使用Fragment而不是MapView
我还知道onMapReady正在被调用。在这里面，我移动相机，然后调用^{onCameraMove或onCameraIdle
密码
这就是代码，它使用了上面链接中的一些想法。我试图删掉任何不相关的东西（其他碎片等）
AndroidManifest。xml
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:安卓="http://schemas.安卓.com/apk/res/安卓"
package="com.example.retailtherapy">
<uses-permission 安卓:name="安卓.permission.ACCESS_COARSE_LOCATION" />
<uses-permission 安卓:name="安卓.permission.ACCESS_FINE_LOCATION" />
<uses-permission 安卓:name="安卓.permission.INTERNET" />
<application
安卓:allowBackup="true"
安卓:icon="@mipmap/ic_launcher"
安卓:label="@string/app_name"
安卓:roundIcon="@mipmap/ic_launcher_round"
安卓:supportsRtl="true"
安卓:theme="@style/AppTheme">
<meta-data
安卓:name="com.google.安卓.geo.API_KEY"
安卓:value="@string/google_maps_key" />
<activity
安卓:name=".MainActivity"
安卓:label="@string/app_name"
安卓:windowSoftInputMode="stateVisible|adjustResize" >
<intent-filter>
<action 安卓:name="安卓.intent.action.MAIN" />
<category 安卓:name="安卓.intent.category.LAUNCHER" />
</intent-filter>
</activity>
</application>
<uses-feature
安卓:glEsVersion="0x00020000"
安卓:required="true"/>
</manifest>
主要活动。xml
<安卓x.constraintlayout.widget.ConstraintLayout xmlns:安卓="http://schemas.安卓.com/apk/res/安卓"
xmlns:app="http://schemas.安卓.com/apk/res-auto"
xmlns:tools="http://schemas.安卓.com/tools"
安卓:id="@+id/container"
安卓:layout_width="match_parent"
安卓:layout_height="match_parent">
<com.google.安卓.material.bottomnavigation.BottomNavigationView
安卓:id="@+id/nav_view"
app:menu="@menu/bottom_nav_menu" />
<fragment
安卓:id="@+id/nav_host_fragment"
安卓:name="安卓x.navigation.fragment.NavHostFragment"
app:defaultNavHost="true"
app:navGraph="@navigation/mobile_navigation"
tools:context=".MainActivity" />
</安卓x.constraintlayout.widget.ConstraintLayout>
移动导航。xml
<navigation xmlns:安卓="http://schemas.安卓.com/apk/res/安卓"
xmlns:app="http://schemas.安卓.com/apk/res-auto"
xmlns:tools="http://schemas.安卓.com/tools"
安卓:id="@+id/mobile_navigation"
app:startDestination="@+id/navigation_map">
<fragment
安卓:id="@+id/navigation_map"
安卓:name="com.example.retailtherapy.ui.map.MapFragment"
安卓:label="Map"
tools:layout="@layout/fragment_map" />
</navigation>
碎片与地图。xml
<RelativeLayout
xmlns:安卓="http://schemas.安卓.com/apk/res/安卓"
xmlns:app="http://schemas.安卓.com/apk/res-auto"
xmlns:tools="http://schemas.安卓.com/tools"
安卓:layout_width="match_parent"
安卓:layout_height="match_parent"
tools:context=".ui.map.MapFragment" >
<com.google.安卓.gms.maps.MapView
安卓:id="@+id/googleMap"
安卓:layout_width="match_parent"
安卓:layout_height="match_parent" />
</RelativeLayout>
地图碎片。java
public class MapFragment extends Fragment implements OnMapReadyCallback, LocationListener {
/*************************************************************************
*
* M E M B E R S
*
*/
// Location manager for getting current location
private LocationManager mLocationManager = null;
// The map object for reference for ease of adding points and such
private GoogleMap mGoogleMap = null;
private MapView mMapView = null;
// The camera position tells us where the view is on the map
private CameraPosition mCameraPosition = Constants.GetDefaultCameraPosition();
// Current latitude and longitude of user
private LatLng mCurrentLatLong = new LatLng(0.0, 0.0);
// These are flags that allow us to selectively not move the camera and
// instead wait for idle so the movement isn't jerky
private boolean mCameraMoving = false;
private boolean mPendingUpdate = false;
/*************************************************************************
*
* F R A G M E N T
*
*/
public View onCreateView(@NonNull LayoutInflater inflater,
ViewGroup container, Bundle savedInstanceState) {
super.onCreateView(inflater, container, savedInstanceState);
View root = inflater.inflate(R.layout.fragment_map, container, false);
// The google map...
MapsInitializer.initialize(getActivity());
mMapView = (MapView) root.findViewById(R.id.googleMap);
mMapView.onCreate(savedInstanceState);
mMapView.getMapAsync(this);
// The required permissions...
final String[] REQUIRED_PERMISSIONS = {
Manifest.permission.ACCESS_COARSE_LOCATION,
Manifest.permission.ACCESS_FINE_LOCATION,
Manifest.permission.INTERNET,
};
requestPermissions(REQUIRED_PERMISSIONS, 0);
return root;
}
@Override
public void onStart() throws SecurityException {
super.onStart();
// Location manager for getting info current location
mLocationManager = (LocationManager) getActivity().getSystemService(Context.LOCATION_SERVICE);
mLocationManager.requestLocationUpdates(LocationManager.GPS_PROVIDER, 1000, 0, this);
}
@Override
public void onResume() {
super.onResume();
mMapView.onResume();
}
@Override
public void onStop() {
super.onStop();
}
@Override
public void onDestroyView() {
super.onDestroyView();
mMapView.onDestroy();
}
@Override
public void onSaveInstanceState(Bundle outState) {
super.onSaveInstanceState(outState);
mMapView.onSaveInstanceState(outState);
}
@Override
public void onLowMemory() {
super.onLowMemory();
mMapView.onLowMemory();
}
/*************************************************************************
*
* G O O G L E M A P S
*
*/
@Override
public void onMapReady(GoogleMap googleMap) {
mGoogleMap = googleMap;
// Assuming if here that we have permissions okay. Dangerous sure
// but I'm lazy...
mGoogleMap.setMyLocationEnabled(true);
// Store the location of the camera for UI purposes so we can go
// back to where we were
mGoogleMap.setOnCameraMoveListener(new GoogleMap.OnCameraMoveListener() {
@Override
public void onCameraMove() {
mCameraPosition = mGoogleMap.getCameraPosition();
}
});
mGoogleMap.setOnCameraMoveStartedListener(new GoogleMap.OnCameraMoveStartedListener() {
@Override
public void onCameraMoveStarted(int i) {
mCameraMoving = true;
}
});
mGoogleMap.setOnCameraIdleListener(new GoogleMap.OnCameraIdleListener() {
@Override
public void onCameraIdle() {
mCameraMoving = false;
if (mPendingUpdate) {
centerCameraOnLocation(false);
}
}
});
// Start with user centered in view
centerCameraOnLocation(true);
}
/*************************************************************************
*
* L O C A T I O N
*
*/
@Override
public void onLocationChanged(Location location) {
// Store the current location so if we start auto-center but aren't
// already, we know where to pan to
LatLng newLatLng = new LatLng(location.getLatitude(), location.getLongitude());
if (!newLatLng.equals(mCurrentLatLong)) {
mCurrentLatLong = new LatLng(location.getLatitude(), location.getLongitude());
centerCameraOnLocation(false);
}
}
@Override
public void onStatusChanged(String provider, int status, Bundle extras) {}
@Override
public void onProviderDisabled(String provider) {}
@Override
public void onProviderEnabled(String provider) {}
/*************************************************************************
*
* M A P C A M E R A
*
*/
/*
* Updates the camera position based on current state. If the camera is
* already moving, then wait.
*/
private void centerCameraOnLocation(boolean animate) {
if (mGoogleMap == null) {
return;
}
if (mCameraMoving) {
mPendingUpdate = true;
return;
}
// Get the CameraPosition to update to based on whether we are auto
// centering or not.
if (mCameraPosition == null) {
mCameraPosition = Constants.GetDefaultCameraPosition();
}
// If this is the same as it was before, then don't reset it
if (mCameraPosition.equals(mGoogleMap.getCameraPosition())) {
return;
}
// Make the update so we can move the camera
CameraUpdate cameraUpdate = CameraUpdateFactory.newCameraPosition(mCameraPosition);
// Move the camera with or without animation. The time we don't want
// animation is when we're setting the position initially
if (animate) {
mGoogleMap.animateCamera(cameraUpdate);
}
else {
mGoogleMap.moveCamera(cameraUpdate);
}
mPendingUpdate = false;
}
}
共 (0) 个答案