I was tiring to build an app which uses google maps for showing places and Pace API for searching places. but it is not being possible to build the app with two different AP
Yes you can use the Same Key for Both Functionality.
Note : Make sure when you Create API Key You need to Enable both API Google Map and Google Places API.
From Google Console. Where you have Created your Project. That's It.
After that Both API will Work with Single API Key.
EDIT 1:
Create Project using this Link If you havn't Created your Project in Google Console.
Then after select created project from list of projects you have.
It will show you All the APIS List. From that Enable APIS which you need to use in your Project.
Then add your Generated API Key in Manifest Android. That's It.
yes you can use same key for both services
http://javapapers.com/android/find-places-nearby-in-google-maps-using-google-places-apiandroid-app/
https://examples.javacodegeeks.com/android/android-google-places-api-example/
First of all go to Google Api Console and select your project
And select api you want to enable like google Map Api or google place api. Enable your api.
Add api key in application tag of Manifest like
<meta-data
android:name="com.google.android.gms.version"
android:value="@integer/google_play_services_version" />
<meta-data
android:name="com.google.android.maps.v2.API_KEY"
android:value="@string/map_api_key" />
if you are using both Map and Geo Api.then only add geo api(it will work for both)
<meta-data
android:name="com.google.android.geo.API_KEY"
android:value="@string/place_api_key" />
Google ConsoleGoogle Map and Google Places API From Google ConsoleYes! you can use same key on both of and also you can use only one key for all Google API
See below image in listed all google api and see this link.
Now you have to Enable all of api, Here must enable API you have require in your app. see this
Now get Stared with this Link