Android 谷歌地图片段中的片段无法操作我的地图
我试图在另一个片段中显示一个google地图片段，但是我无法操纵地图，我已经把我看到的所有步骤都放在了上面 ，但我不能操纵我的地图 XML代码：Android 谷歌地图片段中的片段无法操作我的地图,android,mapfragment,Android,Mapfragment,我试图在另一个片段中显示一个google地图片段，但是我无法操纵地图，我已经把我看到的所有步骤都放在了上面 ，但我不能操纵我的地图 XML代码： <FrameLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent" android:layout_heig
<FrameLayout 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=".FragmentoPrincipalUsuario">
<!-- TODO: Update blank fragment layout -->
<LinearLayout
android:orientation="horizontal"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_gravity="center_horizontal|top">
<fragment
android:id="@+id/map"
android:layout_width="match_parent"
android:layout_height="391dp"
class="com.google.android.gms.maps.MapFragment"
android:layout_alignParentBottom="true"
android:layout_alignParentStart="true"
android:layout_marginTop="60dp" />
</LinearLayout>
<LinearLayout
android:orientation="vertical"
android:layout_width="match_parent"
android:layout_height="149dp"
android:layout_gravity="center_horizontal|bottom">
<Button
android:layout_width="117dp"
android:layout_height="wrap_content"
android:text="pedir taxi"
android:id="@+id/pedirTaxi"
android:layout_gravity="center_horizontal" />
</LinearLayout>
看起来主要的问题是您没有调用getMapAsync（） 由于在片段内部使用嵌套的SupportMapFragment，因此需要使用
getChildFragmentManager（）getMapAsync（）public class MyMapFragment extends SupportMapFragment
implements OnMapReadyCallback {
private GoogleMap mMap;
private Marker marker;
public MyMapFragment () {
}
@Override
public void onResume() {
super.onResume();
setUpMapIfNeeded();
}
private void setUpMapIfNeeded() {
if (mMap == null) {
getMapAsync(this);
}
}
@Override
public void onMapReady(GoogleMap googleMap) {
mMap = googleMap;
setUpMap();
}
private void setUpMap() {
mMap.setMyLocationEnabled(true);
mMap.setMapType(GoogleMap.MAP_TYPE_HYBRID);
mMap.getUiSettings().setMapToolbarEnabled(false);
mMap.setOnMapClickListener(new GoogleMap.OnMapClickListener() {
@Override
public void onMapClick(LatLng point) {
//remove previously placed Marker
if (marker != null) {
marker.remove();
}
//place marker where user just clicked
marker = mMap.addMarker(new MarkerOptions().position(point).title("Marker")
.icon(BitmapDescriptorFactory.defaultMarker(BitmapDescriptorFactory.HUE_MAGENTA)));
}
});
}
}
你好，朋友，谢谢你的回答，1个问题我刚刚添加了调用getChildFragmentManager（）和getMapAsync（）的行，但是我得到了一个编译错误（NullPointerException）‘你知道可能是什么问题吗？@GastonDelaCruzBayugar将NullPointerException的堆栈跟踪添加到问题中，我来看看。@GastonDelaCruzBayugar在膨胀布局后是否调用getMapAsync（）？我在：View x=inflater.inflate（R.layout.fragmento\u principal\u usuario，container，false）后面输入了代码@GastonDelaCruzBayugar这很奇怪，它应该可以工作（前提是您在Android 4.2或更高版本上进行测试）。看看这个答案中的完整工作示例代码：请注意，那里的代码使用getMap（）而不是getMapAsync（），您应该使用getMapAsync（）。
public class DrawerPrincipal extends AppCompatActivity
implements NavigationView.OnNavigationItemSelectedListener,FragmentoPrincipalUsuario.OnFragmentInteractionListener {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_drawer_principal);
Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
setSupportActionBar(toolbar);
//cargar fragment principal usuario
Fragment fragmento= null;
fragmento = new FragmentoPrincipalUsuario();
getSupportFragmentManager().beginTransaction()
.replace(R.id.content_main, fragmento)
.commit();
DrawerLayout drawer = (DrawerLayout) findViewById(R.id.drawer_layout);
ActionBarDrawerToggle toggle = new ActionBarDrawerToggle(
this, drawer, toolbar, R.string.navigation_drawer_open, R.string.navigation_drawer_close);
drawer.setDrawerListener(toggle);
toggle.syncState();
NavigationView navigationView = (NavigationView) findViewById(R.id.nav_view);
navigationView.setNavigationItemSelectedListener(this);
}
@Override
public void onBackPressed() {
DrawerLayout drawer = (DrawerLayout) findViewById(R.id.drawer_layout);
if (drawer.isDrawerOpen(GravityCompat.START)) {
drawer.closeDrawer(GravityCompat.START);
} else {
super.onBackPressed();
}
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.pantalla_principal_usuario, menu);
return true;
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
// Handle action bar item clicks here. The action bar will
// automatically handle clicks on the Home/Up button, so long
// as you specify a parent activity in AndroidManifest.xml.
int id = item.getItemId();
//noinspection SimplifiableIfStatement
if (id == R.id.action_settings) {
return true;
}
return super.onOptionsItemSelected(item);
}
@SuppressWarnings("StatementWithEmptyBody")
@Override
public boolean onNavigationItemSelected(MenuItem item) {
// Handle navigation view item clicks here.
int id = item.getItemId();
if (id == R.id.cuenta) {
// Handle the camera action
} else if (id == R.id.historial_viajes) {
} else if (id == R.id.contacto) {
} else if (id == R.id.compartir) {
} else if (id == R.id.version) {
} else if (id == R.id.salir) {
}
DrawerLayout drawer = (DrawerLayout) findViewById(R.id.drawer_layout);
drawer.closeDrawer(GravityCompat.START);
return true;
}
@Override
public void onFragmentInteraction(Uri uri) {
}
SupportMapFragment mapFragment = ((SupportMapFragment) getChildFragmentManager()
.findFragmentById(R.id.map));
mapFragment.getMapAsync(this);
public class MyMapFragment extends SupportMapFragment
implements OnMapReadyCallback {
private GoogleMap mMap;
private Marker marker;
public MyMapFragment () {
}
@Override
public void onResume() {
super.onResume();
setUpMapIfNeeded();
}
private void setUpMapIfNeeded() {
if (mMap == null) {
getMapAsync(this);
}
}
@Override
public void onMapReady(GoogleMap googleMap) {
mMap = googleMap;
setUpMap();
}
private void setUpMap() {
mMap.setMyLocationEnabled(true);
mMap.setMapType(GoogleMap.MAP_TYPE_HYBRID);
mMap.getUiSettings().setMapToolbarEnabled(false);
mMap.setOnMapClickListener(new GoogleMap.OnMapClickListener() {
@Override
public void onMapClick(LatLng point) {
//remove previously placed Marker
if (marker != null) {
marker.remove();
}
//place marker where user just clicked
marker = mMap.addMarker(new MarkerOptions().position(point).title("Marker")
.icon(BitmapDescriptorFactory.defaultMarker(BitmapDescriptorFactory.HUE_MAGENTA)));
}
});
}
}