application has a String type secret keys. How can I store it safe ?
Shortly I want to hide that keys from hackers in app
You can't. This cannot be achieved.
I think you can crypt text by some code, for example - long password and store it
If you are planning to post that project as open source you can try to hide api keys in build.gradle. Read this : https://medium.com/code-better/hiding-api-keys-from-your-android-repository-b23f5598b906
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