Fragment 无法转换为 SupportMapFragment

Question

我像 1 年前一样制作了这个应用程序，当我打开它时，它会弹出一堆完全随机的错误...可能是由于更新，但后来

error: incompatible types: Fragment cannot be converted to SupportMapFragment
                .findFragmentById(R.id.map);

地图活动代码：

import android.location.Address;
import android.location.Geocoder;
import android.support.v4.app.FragmentActivity;
import android.os.Bundle;
import android.widget.Toast;

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.UiSettings;
import com.google.android.gms.maps.model.BitmapDescriptorFactory;
import com.google.android.gms.maps.model.LatLng;
import com.google.android.gms.maps.model.MarkerOptions;

import java.util.List;
import java.util.Locale;

public class MapsActivity extends FragmentActivity implements OnMapReadyCallback {

    public GoogleMap mMap;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_maps);
        // Obtain the SupportMapFragment and get notified when the map is ready to be used.
        SupportMapFragment mapFragment = (SupportMapFragment) getSupportFragmentManager()
                .findFragmentById(R.id.map);
        mapFragment.getMapAsync(this);
    }


    /**
     * 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,.
     * 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) {
        mMap = googleMap;

        Geocoder geocoder = new Geocoder(getApplicationContext(), Locale.getDefault());
        try {
            List<Address> listAddresses =geocoder.getFromLocation(MainActivity.Globals.Latitude, MainActivity.Globals.Longitude,1);

            if (listAddresses != null && listAddresses.size() > 0) {
                String address = "";

                if (listAddresses.get(0).getThoroughfare() != null) {
                    address += listAddresses.get(0).getThoroughfare() + " ";//Address
                }
                if (listAddresses.get(0).getLocality() != null) {
                    address += listAddresses.get(0).getLocality() + " "; //City
                }
                if (listAddresses.get(0).getAdminArea() != null) {
                    address += listAddresses.get(0).getAdminArea() + " ";//State
                }
                if (listAddresses.get(0).getCountryName() != null) {
                    address += listAddresses.get(0).getCountryName() + " ";//Country
                }
                if (listAddresses.get(0).getAdminArea() != null) {
                    address += listAddresses.get(0).getPostalCode();
                }

                Toast.makeText(MapsActivity.this, address, Toast.LENGTH_SHORT).show();
            }

        } catch (Exception e) {
            e.printStackTrace();
        }

        //Customization
        mMap.setMapType(GoogleMap.MAP_TYPE_HYBRID);
        UiSettings uiSettings = mMap.getUiSettings();
        uiSettings.setCompassEnabled(true);
        uiSettings.setZoomControlsEnabled(true);

        LatLng person = new LatLng(MainActivity.Globals.Latitude, MainActivity.Globals.Longitude);
        mMap.addMarker(new MarkerOptions().position(person).title("Person").icon(BitmapDescriptorFactory.defaultMarker(BitmapDescriptorFactory.HUE_AZURE)));
        mMap.moveCamera(CameraUpdateFactory.newLatLngZoom(person,12));
    }
}

如果它有助于 android studio 让我改变了一些 gradle 的东西

GradleProperties：

org.gradle.jvmargs=-Xmx1536m
android.useAndroidX=true

向其中添加 Jetifiers 会给我带来一大堆错误，所以我没有这样做

Build.Gradle：

apply plugin: 'com.google.gms.google-services'

android {
    signingConfigs {
        config {
            keyAlias 'Name'
            keyPassword 'Password'
            storeFile file('/Location')
            storePassword 'Password'
        }
    }
    compileSdkVersion 29
    defaultConfig {
        applicationId "com.example.appMaps"
        minSdkVersion 23
        targetSdkVersion 29
        versionCode 7
        versionName '7.0'
        testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
    }
    compileOptions {
        sourceCompatibility JavaVersion.VERSION_1_8
        targetCompatibility JavaVersion.VERSION_1_8
    }
    buildTypes {
        release {
            minifyEnabled false
            proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
        }
    }
    productFlavors {
    }
}

dependencies {
    implementation fileTree(include: ['*.jar'], dir: 'libs')
    //noinspection GradleCompatible,GradleCompatible
    implementation 'com.android.support:appcompat-v7:28.0.0'
    implementation 'com.google.android.gms:play-services-maps:17.0.0'
    implementation 'com.android.support.constraint:constraint-layout:1.1.3'
    testImplementation 'junit:junit:4.12'
    //noinspection GradleCompatible
    androidTestImplementation 'com.android.support.test:runner:1.0.2'
    androidTestImplementation 'com.android.support.test.espresso:espresso-core:3.0.2'
    implementation 'com.google.firebase:firebase-core:17.4.3'
    implementation 'com.google.firebase:firebase-database:19.3.1'
    implementation 'com.google.firebase:firebase-auth:19.3.1'
    implementation 'com.google.firebase:firebase-firestore:21.4.3'
    implementation 'com.android.support:multidex:1.0.3'
    //noinspection GradleCompatible,GradleCompatible
    implementation 'com.android.support:design:26.1.0'
}

repositories {
    mavenCentral()
}

Answer 1

最终的解决方案是使用 AppCompatActivity 而不是 FragmentActivity 然后还必须启用 Jetifier（任何人都可以解释 Jetifier 是什么以及为什么使用它） 还必须对主代码进行一些更改才能使用snacker

实际上必须将所有内容都更改为 androidX