如何在片段中运行此 API？
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【中文标题】如何在片段中运行此 API？【英文标题】：How to run this API in a Fragment? 【发布时间】：2020-05-13 04:16:28 【问题描述】：我只是想按照我在 YouTube (https://www.youtube.com/watch?v=boyyLhXAZAQ) 上找到的教程运行 Google Maps API，出于某种原因，我不知道为什么，但它在主要活动中有效，但我无法获得它在与“fragment_election.xml”相关联的名为“ElectionFragment.java”的片段中工作
是不是跟fragment java类的OnCreate/OnCreateView有关？
ElectionFragment.java
package com.example.fypfinaltrial;
import android.Manifest;
import android.content.pm.PackageManager;
import android.location.Location;
import android.os.Bundle;
import androidx.annotation.NonNull;
import androidx.core.app.ActivityCompat;
import androidx.fragment.app.Fragment;
import androidx.fragment.app.FragmentActivity;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.Toast;
import com.google.android.gms.location.FusedLocationProviderClient;
import com.google.android.gms.location.LocationServices;
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;
import com.google.android.gms.tasks.OnSuccessListener;
import com.google.android.gms.tasks.Task;
/**
* A simple @link Fragment subclass.
*/
public class ElectionFragment extends FragmentActivity implements OnMapReadyCallback
Location currentLocation;
FusedLocationProviderClient fusedLocationProviderClient;
private static final int REQUEST_CODE = 101;
public ElectionFragment()
// Required empty public constructor
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState)
// Inflate the layout for this fragment
return inflater.inflate(R.layout.fragment_election, container, false);
@Override
protected void onCreate(Bundle savedInstanceState)
super.onCreate(savedInstanceState);
setContentView(R.layout.fragment_election);
fusedLocationProviderClient = LocationServices.getFusedLocationProviderClient(this);
fetchLastLocation();
private void fetchLastLocation()
if (ActivityCompat.checkSelfPermission(this, Manifest.permission.ACCESS_FINE_LOCATION) != PackageManager.PERMISSION_GRANTED)
ActivityCompat.requestPermissions(this, new String[]
Manifest.permission.ACCESS_FINE_LOCATION, REQUEST_CODE);
return;
Task<Location> task = fusedLocationProviderClient.getLastLocation();
task.addOnSuccessListener(new OnSuccessListener<Location>()
@Override
public void onSuccess(Location location)
if (location != null)
currentLocation = location;
Toast.makeText(getApplicationContext(), currentLocation.getLatitude()
+ " " + currentLocation.getLongitude(), Toast.LENGTH_SHORT).show();
SupportMapFragment supportMapFragment = (SupportMapFragment)
getSupportFragmentManager().findFragmentById(R.id.google_map);
supportMapFragment.getMapAsync(ElectionFragment.this);
);
@Override
public void onMapReady(GoogleMap googleMap)
LatLng latLng = new LatLng(currentLocation.getLatitude(), currentLocation.getLongitude());
MarkerOptions markerOptions = new MarkerOptions().position(latLng)
.title("I Am Here");
googleMap.animateCamera(CameraUpdateFactory.newLatLng(latLng));
googleMap.animateCamera(CameraUpdateFactory.newLatLngZoom(latLng, 5));
googleMap.addMarker(markerOptions);
@Override
public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissisons, @NonNull int[] grantResults)
switch (requestCode)
case REQUEST_CODE:
if (grantResults.length > 0 && grantResults[0] == PackageManager.PERMISSION_GRANTED)
fetchLastLocation();
break;
这里是 fragment_election.xml
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_
android:layout_
tools:context=".ElectionFragment">
<fragment
android:layout_
android:layout_
android:id="@+id/google_map"
android:name="com.google.android.gms.maps.SupportMapFragment"/>
</RelativeLayout>
它与片段中的片段有关吗？
【问题讨论】：
【参考方案1】：如果你想在片段中实现谷歌地图，那么你必须遵循一些不同的过程，这里是在片段中实现谷歌地图的方法。
在 XML 文件中
<com.google.android.gms.maps.MapView
android:id="@+id/fake_map"
android:layout_
android:layout_/>
在JAVA文件中
public class ElectionFragment extends Fragment implements OnMapReadyCallback
MapView mapView;
GoogleMap mMap;
Marker marker;
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState)
View view = inflater.inflate(R.layout.fragment_election, container, false);
mapView = view.findViewById(R.id.fake_map);
mapView.getMapAsync(this);
mapView.onCreate(savedInstanceState);
mapView.onResume();// needed to get the map to display immediately
try
MapsInitializer.initialize(getActivity().getApplicationContext());
catch (Exception e)
e.printStackTrace();
return view;
@Override
public void onMapReady(GoogleMap googleMap)
this.mMap = googleMap;
LatLng latLng = new LatLng(43.237601,76.884760);
MarkerOptions markerOptions = new MarkerOptions();
markerOptions.position(latLng);
markerOptions.title("");
markerOptions.icon(BitmapDescriptorFactory.fromResource(R.drawable.marker_icon));
markerOptions.getPosition();
marker = mMap.addMarker(markerOptions);
CameraPosition cameraPosition = CameraPosition.builder()
.target(latLng)
.zoom(17)
// .bearing(20)
.build();
mMap.animateCamera(CameraUpdateFactory.newCameraPosition(cameraPosition), 2000, null);
@Override
public void onResume()
super.onResume();
mapView.onResume();
@Override
public void onPause()
super.onPause();
mapView.onPause();
@Override
public void onDestroy()
super.onDestroy();
mapView.onDestroy();
@Override
public void onLowMemory()
super.onLowMemory();
mapView.onLowMemory();
【讨论】：
嘿，感谢一百万的帮助。 “try MapsInitializer.initialize(parentActivity.getApplicationContext());”似乎仍然存在问题部分。我的地段的父活动是一个activity_main，它使用导航抽屉连接地段。我不确定在 parentActivity 中放置什么 使用 getActivity().getApplicationContext()..... 忽略 parentActivity 这是我的概念。我从我的项目中复制了这段代码以上是关于如何在片段中运行此 API？的主要内容，如果未能解决你的问题，请参考以下文章