java - 将谷歌地图( fragment ？)添加到 Activity

Question

我正在尝试将 map fragment 添加到与入门指南非常相似的 Activity : https://developers.google.com/maps/documentation/android-sdk/start

我的问题是应用程序在运行时就退出了。 所以对于 MainActivity.java 文件的相关部分:

import android.os.Bundle;
import androidx.fragment.app.FragmentActivity;

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 MainActivity extends FragmentActivity implements OnMapReadyCallback {
    private GoogleMap mMap;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

       SupportMapFragment mapFragment = (SupportMapFragment) getSupportFragmentManager().findFragmentById(R.id.map);
        mapFragment.getMapAsync(this);
    }

    @Override
    public void onMapReady(GoogleMap googleMap) {
        mMap = googleMap;

        // Add a marker in Sydney and move the camera
        LatLng sydney = new LatLng(-34, 151);
        mMap.addMarker(new MarkerOptions().position(sydney).title("Marker in Sydney"));
        mMap.moveCamera(CameraUpdateFactory.newLatLng(sydney));
    }
}

还有 activity_main.xml 的(希望是相关部分):

<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout 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:id="@+id/coordinatorLayout"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".MainActivity">


    <fragment
        xmlns:map="http://schemas.android.com/apk/res-auto"
        android:id="@+id/map"
        android:name="com.google.android.gms.maps.SupportMapFragment"
        android:layout_width="363dp"
        android:layout_height="252dp"
        android:layout_marginStart="8dp"
        android:layout_marginLeft="8dp"
        android:layout_marginTop="8dp"
        android:layout_marginEnd="8dp"
        android:layout_marginRight="8dp"
        map:layout_constraintEnd_toEndOf="parent"
        map:layout_constraintStart_toStartOf="parent"
        map:layout_constraintTop_toBottomOf="@+id/rcv"
        tools:context=".MainActivityy" />



</androidx.constraintlayout.widget.ConstraintLayout>

除此之外，我还在值文件夹中创建了“google_maps_api.xml”(真正的 api 编辑):

<?xml version="1.0" encoding="utf-8"?>
<resources>
    <string name="google_maps_key" templateMergeStrategy="preserve" translatable="false">MYGOOGLEAPI</string>

</resources>

我已经按照前面链接的示例验证了我的 api 是否正常工作，但是在我自己的应用程序中它根本不起作用。

我已经设法在“logcat”中识别出以下错误:

java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.myapplication/com.example.myapplication.MainActivity}: android.view.InflateException: Binary XML file line #78 in com.example.myapplication:layout/activity_main: Binary XML file line #78 in com.example.myapplication:layout/activity_main: Error inflating class fragment

据我所知，我的问题出在 activity_main.xml 文件中，不幸的是，它的含义或解决方法让我感到困惑。任何帮助是极大的赞赏。澄清一下，第 78 行是“

另一个想法是我可能必须像小部件一样初始化/声明它？

在前面提到的情况下包括完整的 Logcat 并不重要:

2019-10-08 20:45:20.514 7610-7610/? E/e.myapplicatio: Unknown bits set in runtime_flags: 0x8000
2019-10-08 20:45:21.717 7610-7610/com.example.myapplication E/AndroidRuntime: FATAL EXCEPTION: main
    Process: com.example.myapplication, PID: 7610
    java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.myapplication/com.example.myapplication.MainActivity}: android.view.InflateException: Binary XML file line #78 in com.example.myapplication:layout/activity_main: Binary XML file line #78 in com.example.myapplication:layout/activity_main: Error inflating class fragment
        at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:3270)
        at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:3409)
        at android.app.servertransaction.LaunchActivityItem.execute(LaunchActivityItem.java:83)
        at android.app.servertransaction.TransactionExecutor.executeCallbacks(TransactionExecutor.java:135)
        at android.app.servertransaction.TransactionExecutor.execute(TransactionExecutor.java:95)
        at android.app.ActivityThread$H.handleMessage(ActivityThread.java:2016)
        at android.os.Handler.dispatchMessage(Handler.java:107)
        at android.os.Looper.loop(Looper.java:214)
        at android.app.ActivityThread.main(ActivityThread.java:7356)
        at java.lang.reflect.Method.invoke(Native Method)
        at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:492)
        at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:930)
     Caused by: android.view.InflateException: Binary XML file line #78 in com.example.myapplication:layout/activity_main: Binary XML file line #78 in com.example.myapplication:layout/activity_main: Error inflating class fragment
     Caused by: android.view.InflateException: Binary XML file line #78 in com.example.myapplication:layout/activity_main: Error inflating class fragment
     Caused by: java.lang.RuntimeException: API key not found.  Check that <meta-data android:name="com.google.android.geo.API_KEY" android:value="your API key"/> is in the <application> element of AndroidManifest.xml
        at com.google.maps.api.android.lib6.drd.p.b(:com.google.android.gms.dynamite_mapsdynamite@17786052@17.7.86 (040700-256199907):22)
        at com.google.maps.api.android.lib6.auth.d.a(:com.google.android.gms.dynamite_mapsdynamite@17786052@17.7.86 (040700-256199907):10)
        at com.google.maps.api.android.lib6.impl.d.a(:com.google.android.gms.dynamite_mapsdynamite@17786052@17.7.86 (040700-256199907):41)
        at com.google.android.gms.maps.internal.CreatorImpl.a(:com.google.android.gms.dynamite_mapsdynamite@17786052@17.7.86 (040700-256199907):61)
        at com.google.android.gms.maps.internal.CreatorImpl.newMapFragmentDelegate(:com.google.android.gms.dynamite_mapsdynamite@17786052@17.7.86 (040700-256199907):25)
        at com.google.android.gms.maps.internal.h.a(:com.google.android.gms.dynamite_mapsdynamite@17786052@17.7.86 (040700-256199907):73)
        at hp.onTransact(:com.google.android.gms.dynamite_mapsdynamite@17786052@17.7.86 (040700-256199907):4)
        at android.os.Binder.transact(Binder.java:914)
        at com.google.android.gms.internal.maps.zza.zza(Unknown Source:10)
        at com.google.android.gms.maps.internal.zzf.zzc(Unknown Source:5)
        at com.google.android.gms.maps.SupportMapFragment$zzb.zzd(Unknown Source:12)
        at com.google.android.gms.maps.SupportMapFragment$zzb.createDelegate(Unknown Source:6)
        at com.google.android.gms.dynamic.DeferredLifecycleHelper.zaa(Unknown Source:18)
        at com.google.android.gms.dynamic.DeferredLifecycleHelper.onInflate(Unknown Source:20)
        at com.google.android.gms.maps.SupportMapFragment.onInflate(Unknown Source:21)
        at androidx.fragment.app.Fragment.onInflate(Fragment.java:1384)
        at androidx.fragment.app.FragmentManagerImpl.onCreateView(FragmentManager.java:3744)
        at androidx.fragment.app.FragmentController.onCreateView(FragmentController.java:120)
        at androidx.fragment.app.FragmentActivity.dispatchFragmentsOnCreateView(FragmentActivity.java:405)
        at androidx.fragment.app.FragmentActivity.onCreateView(FragmentActivity.java:387)
        at android.view.LayoutInflater.tryCreateView(LayoutInflater.java:1069)
        at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:997)
2019-10-08 20:45:21.718 7610-7610/com.example.myapplication E/AndroidRuntime:     at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:961)
        at android.view.LayoutInflater.rInflate(LayoutInflater.java:1123)
        at android.view.LayoutInflater.rInflateChildren(LayoutInflater.java:1084)
        at android.view.LayoutInflater.inflate(LayoutInflater.java:682)
        at android.view.LayoutInflater.inflate(LayoutInflater.java:534)
        at android.view.LayoutInflater.inflate(LayoutInflater.java:481)
        at com.android.internal.policy.PhoneWindow.setContentView(PhoneWindow.java:438)
        at android.app.Activity.setContentView(Activity.java:3324)
        at com.example.myapplication.MainActivity.onCreate(MainActivity.java:40)
        at android.app.Activity.performCreate(Activity.java:7802)
        at android.app.Activity.performCreate(Activity.java:7791)
        at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1299)
        at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:3245)
        at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:3409)
        at android.app.servertransaction.LaunchActivityItem.execute(LaunchActivityItem.java:83)
        at android.app.servertransaction.TransactionExecutor.executeCallbacks(TransactionExecutor.java:135)
        at android.app.servertransaction.TransactionExecutor.execute(TransactionExecutor.java:95)
        at android.app.ActivityThread$H.handleMessage(ActivityThread.java:2016)
        at android.os.Handler.dispatchMessage(Handler.java:107)
        at android.os.Looper.loop(Looper.java:214)
        at android.app.ActivityThread.main(ActivityThread.java:7356)
        at java.lang.reflect.Method.invoke(Native Method)
        at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:492)
        at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:930)

Answer 1

尝试在 android list 文件的标签内添加 google map api key。

<application>
    //...
    <meta-data
        android:name="com.google.android.geo.API_KEY"
        android:value="YOUR_API_KEY"/>
    //...
</application>