我是AndroidStudio的初学者，所以我尝试构建一个基本的应用程序。我添加了一个GoogleMap活动，效果很好。然后我把Firebase添加到应用程序中，我发现GoogleMapActivity已经不起作用了。它只是给我看了一个空白页面，左下角有"谷歌"标志。我试着在虚拟设备和真实设备上运行这个程序。没有成功。
我试图更改密钥，我也清理/重建了应用程序。事实是……logcat没有显示任何信息，甚至没有警告。
我真的不明白为什么GoogleMapActivity以前是有效的，现在已经不起作用了。
您必须知道，当我添加Firebase时，我更改了很多依赖项。也许是SDK版本控制的问题？我不知道。。。
以下是我在AndroidManifest.xml:中的权限
<uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" />
<!-- To auto-complete the email text field in the login form with the user's emails -->
<uses-permission android:name="android.permission.GET_ACCOUNTS" />
<uses-permission android:name="android.permission.READ_PROFILE" />
<uses-permission android:name="android.permission.READ_CONTACTS" />
<uses-permission android:name="android.permission.INTERNET" />
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
<uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION" />
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>
<uses-permission android:name="com.google.android.providers.gsf.permission.READ_GSERVICES"/>
<permission
android:name="com.example.mapdemo.permission.MAPS_RECEIVE"
android:protectionLevel="signature" />
<uses-permission android:name="com.example.barcodelibrary.permission.MAPS_RECEIVE"/>
<meta-data
android:name="com.google.android.geo.API_KEY"
android:value="@string/google_maps_key" />
<meta-data android:name="com.google.android.gms.version"
android:value="@integer/google_play_services_version" />
当然，我在Google_maps_API.xml文件中有一个有效的Google API密钥，如下所示。
<string name="google_maps_key" templateMergeStrategy="preserve" translatable="false">[i have a real key but i don't know if i can show it here ?]</string>
这是我的build.gradle(模块：应用程序(文件：
apply plugin: 'com.android.application'
apply plugin: 'com.google.gms.google-services'
android {
compileSdkVersion 28
defaultConfig {
applicationId "com.kandel.myandroidapp"
minSdkVersion 26
targetSdkVersion 28
versionCode 1
versionName "1.0"
testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
}
buildTypes {
release {
minifyEnabled false
proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
}
}
}
dependencies {
implementation fileTree(include: ['*.jar'], dir: 'libs')
//noinspection GradleCompatible
implementation 'com.android.support:appcompat-v7:28.0.0-alpha3'
implementation 'com.android.support.constraint:constraint-layout:1.1.2'
implementation 'com.android.support:support-annotations:28.0.0-alpha3'
implementation 'com.google.firebase:firebase-auth:16.0.2'
implementation 'com.google.firebase:firebase-core:16.0.1'
implementation 'com.google.firebase:firebase-database:16.0.1'
implementation 'com.google.android.gms:play-services:12.0.1'
implementation 'com.google.android.gms:play-services-maps:15.0.1'
implementation 'com.google.android.gms:play-services-auth:15.0.1'
implementation 'com.google.android.gms:play-services-identity:15.0.1'
testImplementation 'junit:junit:4.12'
androidTestImplementation 'com.android.support.test:runner:1.0.2'
androidTestImplementation 'com.android.support.test.espresso:espresso-core:3.0.2'
}
编辑1：添加我的GoogleMapActivity代码
正如您所看到的，这是AndroidStudio提供的基本活动。我错过什么了吗？
package com.kandel.myandroidapp;
import android.support.v4.app.FragmentActivity;
import android.os.Bundle;
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 MapsActivity extends FragmentActivity implements OnMapReadyCallback {
private 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,
* 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) {
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));
}
}
编辑2：添加我的Activity_maps.xml文件
<?xml version="1.0" encoding="utf-8"?>
<fragment xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:map="http://schemas.android.com/apk/res-auto"
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=".MapsActivity" />
添加firebase时，必须将其google-services.json添加到项目中。谷歌地图在将firebase添加到项目后使用该文件中的密钥
将其添加到清单文件中
` <meta-data
android:name="com.google.android.geo.API_KEY"
android:value="Your Api key" />`
有关更多详细信息，请访问谷歌地图api
您应该在生成密钥时添加SHA-1指纹，您将从android工作室或命令行获得它。您可以通过以下链接生成它，并在生成地图的关键点时使用它。
密钥库证书的SHA-1指纹
使用android studio:生成它的步骤
- 转到android工作室右侧的gradle文件
- 扩展您的项目
- 转到应用程序文件夹并点击android
- 选择要生成的签名报告。5( 您可以在底部的Run空间中找到它，关键字为SHA1