How to debug the Android App in release mode using Android studio

 buildTypes {
    release {
    debuggable true
    minifyEnabled true
    proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.txt'
}
}

happy coding.Mark this answer up..if it helps.. :)

In your gradle file, you must add debuggable ability in your release flavor.

buildTypes {
    release {
        debuggable true
        minifyEnabled false
        signingConfig signingConfigs.release
        proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.txt'
    }
    debug {
        debuggable true
        minifyEnabled false
        applicationIdSuffix '.debug'
    } 
}

signingConfig is release configuration it must be added in gradle file in android{} block, something like this:

signingConfigs {
    release {
        keyAlias 'YourAppKey'
        keyPassword 'somePassword'
        storeFile file('appkeyfile.jks')
        storePassword 'somePassword'
    }
} 

In my case, I have created the debug configuration same as previous release build and started debugging. It means you have to give sign build in debug version also in build gradle.

signingConfigs {
    config {
        keyAlias 'abc'
        keyPassword 'xyz'
        storeFile file('<<KEYSTORE-PATH>>.keystore')
        storePassword 'password'
    }
}
buildTypes {
  debug {
      debuggable true
      signingConfig signingConfigs.config
      proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.txt'
    }
}

So It will have the same sign as release build and you can debug when it runs.