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I am working with the Google Map Android API v2 in an android application.
It works fine with the unsigned apk on a different device. But when I have signed the apk and uploaded my application to the Play Store the downloaded application displays a white screen instead of the map.
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Clear the app's cache & data On your Android phone or tablet, open the Settings app . Tap Apps & notifications. Follow the steps on your device to find the Maps app. After you select the app, storage & cache options should be available.
There are a several reasons why your google maps may not be working, the most common issue being no Google Map API key set or set incorrectly. To use the Google Maps JavaScript API, you must register your app project on the Google Cloud Platform Console and get a Google API key which you can add to your app.
What type of keystore you are using? there are two keys. Debug and release key. If you use debug key and uploaded in android market, map will look blank. Use release key when you signed your apk.
Release key procedure
Step 1:
Say for example your apk name is A and you are signing and creating a keystore for A.apk ie A.keystore will be created in some drive location.Let's consider it in E drive.
step 2:
Now locate to jdk in C drive(Considering for windows and assigning C drive)
C:\Program Files\Java\jdk1.7.0\bin>keytool -list -v -keystore E:\A.keystore -alias A
So it will create SHA-1 finger print.
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