为什么Google Maps Fragment在Android应用程序中为空白

如何解决为什么Google Maps Fragment在Android应用程序中为空白

我是Android开发的新手。我在底部导航中添加了Google Maps Fragment，还添加了api键。但是，当我在应用程序中打开地图片段时，它会显示空白地图。

我已经将Android Studio的默认代码用于Google Maps Fragment和底部导航，但是我不知道为什么会遇到这个问题。

我曾在不同的设备上尝试过此操作，但仍然遇到相同的问题

这是我的代码

MapsFragment.java

package com.avvaldeveloper.mapfrag.ui.map;

import android.Manifest;
import android.content.pm.PackageManager;
import android.os.Build;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.Toast;

import androidx.annotation.NonNull;
import androidx.annotation.Nullable;
import androidx.core.app.ActivityCompat;
import androidx.fragment.app.Fragment;

import com.avvaldeveloper.mapfrag.R;
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;

public class MapsFragment extends Fragment {

    public static final int REQUEST_LOCATION_CODE = 99;
    private OnMapReadyCallback callback = new OnMapReadyCallback() {

        /**
         * Manipulates the map once available.
         * This callback is triggered when the map is ready to be used.
         * This is where we can add markers or lines,add listeners or move the camera.
         * In this case,we just add a marker near Sydney,Australia.
         * If Google Play services is not installed on the device,the user will be prompted to
         * install it inside the SupportMapFragment. This method will only be triggered once the
         * user has installed Google Play services and returned to the app.
         */
        @Override
        public void onMapReady(GoogleMap googleMap) {

            LatLng sydney = new LatLng(-34,151);
            googleMap.addMarker(new MarkerOptions().position(sydney).title("Marker in Sydney"));
            googleMap.moveCamera(CameraUpdateFactory.newLatLng(sydney));

            if (ActivityCompat.checkSelfPermission(getActivity(),Manifest.permission.ACCESS_FINE_LOCATION) != PackageManager.PERMISSION_GRANTED && ActivityCompat.checkSelfPermission(getActivity(),Manifest.permission.ACCESS_COARSE_LOCATION) != PackageManager.PERMISSION_GRANTED) {
                // TODO: Consider calling
                //code for permission not granted.
                if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
                    requestPermissions(new String[]{Manifest.permission.ACCESS_COARSE_LOCATION,Manifest.permission.ACCESS_FINE_LOCATION},REQUEST_LOCATION_CODE);
                }
            } else {

                Toast.makeText(getActivity(),"Loading",Toast.LENGTH_LONG).show();

            }

        }
    };

    @Nullable
    @Override
    public View onCreateView(@NonNull LayoutInflater inflater,@Nullable ViewGroup container,@Nullable Bundle savedInstanceState) {
        return inflater.inflate(R.layout.fragment_maps,container,false);
    }

    @Override
    public void onViewCreated(@NonNull View view,@Nullable Bundle savedInstanceState) {
        super.onViewCreated(view,savedInstanceState);
        SupportMapFragment mapFragment =
                (SupportMapFragment) getChildFragmentManager().findFragmentById(R.id.map);
        if (mapFragment != null) {
            mapFragment.getMapAsync(callback);

        }
    }
}

fragment_maps.xml

<?xml version="1.0" encoding="utf-8"?>
<fragment xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:id="@+id/map"
    android:name="com.google.android.gms.maps.SupportMapFragment"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".ui.map.MapsFragment" />

依赖项

implementation fileTree(dir: "libs",include: ["*.jar"])
    implementation 'androidx.appcompat:appcompat:1.2.0'
    implementation 'com.google.android.material:material:1.2.0'
    implementation 'androidx.constraintlayout:constraintlayout:1.1.3'
    implementation 'androidx.vectordrawable:vectordrawable:1.1.0'
    implementation 'androidx.navigation:navigation-fragment:2.3.0'
    implementation 'androidx.navigation:navigation-ui:2.3.0'
    implementation 'androidx.lifecycle:lifecycle-extensions:2.2.0'
    implementation 'com.google.android.gms:play-services-maps:17.0.0'
    implementation 'com.google.android.gms:play-services-location:17.0.0'
    testImplementation 'junit:junit:4.12'
    androidTestImplementation 'androidx.test.ext:junit:1.1.1'
    androidTestImplementation 'androidx.test.espresso:espresso-core:3.2.0'

AndroidManifest.xml

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.avvaldeveloper.mapfrag">

    <!--
         The ACCESS_COARSE/FINE_LOCATION permissions are not required to use
         Google Maps Android API v2,but you must specify either coarse or fine
         location permissions for the "MyLocation" functionality.
    -->
    <uses-permission android:name="android.permission.INTERNET" />
    <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
    <uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" />
    <uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION" />
    <uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" />

    <uses-feature
        android:glEsVersion="0x00020000"
        android:required="true" />

    <application
        android:allowBackup="true"
        android:icon="@mipmap/ic_launcher"
        android:label="@string/app_name"
        android:roundIcon="@mipmap/ic_launcher_round"
        android:supportsRtl="true"
        android:theme="@style/AppTheme">

        <!--
             The API key for Google Maps-based APIs is defined as a string resource.
             (See the file "res/values/google_maps_api.xml").
             Note that the API key is linked to the encryption key used to sign the APK.
             You need a different API key for each encryption key,including the release key that is used to
             sign the APK for publishing.
             You can define the keys for the debug and release targets in src/debug/ and src/release/.
        -->
        <meta-data
            android:name="com.google.android.geo.API_KEY"
            android:value="@string/google_maps_key" />

        <activity
            android:name=".MainActivity"
            android:label="@string/app_name">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
    </application>

</manifest>

MainActivity.java

package com.avvaldeveloper.mapfrag;

import android.os.Bundle;

import com.google.android.material.bottomnavigation.BottomNavigationView;

import androidx.appcompat.app.AppCompatActivity;
import androidx.navigation.NavController;
import androidx.navigation.Navigation;
import androidx.navigation.ui.AppBarConfiguration;
import androidx.navigation.ui.NavigationUI;

public class MainActivity extends AppCompatActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        BottomNavigationView navView = findViewById(R.id.nav_view);
        // Passing each menu ID as a set of Ids because each
        // menu should be considered as top level destinations.
        AppBarConfiguration appBarConfiguration = new AppBarConfiguration.Builder(
                R.id.navigation_home,R.id.navigation_dashboard,R.id.navigation_notifications,R.id.navigation_map)
                .build();
        NavController navController = Navigation.findNavController(this,R.id.nav_host_fragment);
        NavigationUI.setupActionBarWithNavController(this,navController,appBarConfiguration);
        NavigationUI.setupWithNavController(navView,navController);
    }

}

Logcat

2020-08-15 12:14:50.048 1434-2751/? W/audio_hw_generic: Not supplying enough data to HAL,expected position 17727575,only wrote 17727120
2020-08-15 12:14:50.169 13447-13447/com.avvaldeveloper.mapfrag I/Google Maps Android API: Google Play services package version: 200414022
2020-08-15 12:14:50.560 13447-13715/com.avvaldeveloper.mapfrag D/EGL_emulation: eglCreateContext: 0xe0e86fe0: maj 1 min 0 rcv 1
2020-08-15 12:14:50.560 1442-1442/? D/gralloc_ranchu: gralloc_alloc: Creating ashmem region of size 7344128
2020-08-15 12:14:50.568 1838-1866/system_process E/memtrack: Couldn't load memtrack module
2020-08-15 12:14:50.568 1838-1866/system_process W/android.os.Debug: failed to get memory consumption info: -1
2020-08-15 12:14:50.611 1838-5693/system_process I/GnssLocationProvider: WakeLock acquired by sendMessage(SET_REQUEST,com.android.server.location.GnssLocationProvider$GpsRequest@670f1d3)
2020-08-15 12:14:50.618 1838-1866/system_process I/GnssLocationProvider: WakeLock released by handleMessage(SET_REQUEST,com.android.server.location.GnssLocationProvider$GpsRequest@670f1d3)
2020-08-15 12:14:50.632 13447-13715/com.avvaldeveloper.mapfrag D/EGL_emulation: eglMakeCurrent: 0xe0e86fe0: ver 1 0 (tinfo 0xe0e83d50)
2020-08-15 12:14:50.775 2460-13658/com.google.android.gms.persistent I/GCoreUlr: Successfully inserted 1 locations
2020-08-15 12:14:50.868 1442-1442/? D/gralloc_ranchu: gralloc_alloc: Creating ashmem region of size 122880
2020-08-15 12:14:50.875 1442-1442/? D/gralloc_ranchu: gralloc_alloc: Creating ashmem region of size 122880
2020-08-15 12:14:50.881 1442-1536/? D/gralloc_ranchu: gralloc_alloc: Creating ashmem region of size 122880
2020-08-15 12:14:50.916 13447-13481/com.avvaldeveloper.mapfrag D/EGL_emulation: eglMakeCurrent: 0xe0e850c0: ver 3 1 (tinfo 0xe0e832f0)
2020-08-15 12:14:50.943 13447-13481/com.avvaldeveloper.mapfrag D/EGL_emulation: eglMakeCurrent: 0xe0e850c0: ver 3 1 (tinfo 0xe0e832f0)
2020-08-15 12:14:50.957 1442-1536/? D/gralloc_ranchu: gralloc_alloc: Creating ashmem region of size 7344128
2020-08-15 12:14:51.013 1442-1536/? D/gralloc_ranchu: gralloc_alloc: Creating ashmem region of size 7344128
2020-08-15 12:14:53.290 1434-1434/? W/audio_hw_generic: Not supplying enough data to HAL,expected position 18036652,only wrote 17882640
2020-08-15 12:14:54.091 1838-1838/system_process W/WindowManager: removeWindowToken: Attempted to remove non-existing token: android.os.Binder@b160ea4
2020-08-15 12:14:54.095 1452-1988/? D/gralloc_ranchu: gralloc_unregister_buffer: exiting HostConnection (is buffer-handling thread)
2020-08-15 12:14:54.098 1452-1988/? D/gralloc_ranchu: gralloc_unregister_buffer: exiting HostConnection (is buffer-handling thread)
2020-08-15 12:14:54.103 1452-1988/? D/gralloc_ranchu: gralloc_unregister_buffer: exiting HostConnection (is buffer-handling thread)
2020-08-15 12:14:54.107 1452-1988/? D/gralloc_ranchu: gralloc_unregister_buffer: exiting HostConnection (is buffer-handling thread)
2020-08-15 12:14:54.644 1443-1443/? D/gralloc_ranchu: gralloc_unregister_buffer: exiting HostConnection (is buffer-handling thread)
2020-08-15 12:14:54.645 1443-1443/? D/gralloc_ranchu: gralloc_unregister_buffer: exiting HostConnection (is buffer-handling thread)
2020-08-15 12:14:59.291 1450-1450/? I/boot-pipe: done populating /dev/random
2020-08-15 12:15:06.020 2460-13658/com.google.android.gms.persistent I/GCoreUlr: Successfully inserted 1 locations
2020-08-15 12:15:06.113 1838-1848/system_process I/zygote: Background concurrent copying GC freed 14909(1034KB) AllocSpace objects,0(0B) LOS objects,36% free,10MB/16MB,paused 3.384ms total 205.409ms
2020-08-15 12:15:08.879 1838-1872/system_process E/BatteryExternalStatsWorker: modem info is invalid: ModemActivityInfo{ mTimestamp=0 mSleepTimeMs=0 mIdleTimeMs=0 mTxTimeMs[]=[0,0] mRxTimeMs=0 mEnergyUsed=0}
2020-08-15 12:15:21.082 2460-13402/com.google.android.gms.persistent I/GCoreUlr: Successfully inserted 1 locations

显示错误

2020-08-15 12:17:12.792 1838-1866/system_process E/memtrack: Couldn't load memtrack module