0

I am trying to assign value to below meta in manifest.

currently i have assign value from string.xml class.

<meta-data
   android:name="com.google.android.geo.API_KEY"
   android:value= "@string/MAPS_API_KEY" />

But I want Some thing like this..

<meta-data
   android:name="com.google.android.geo.API_KEY"
   android:value= com.packagename.MyConstantInterface.MAPS_API_KEY />

I have search a lot, but haven't find a good solution.

NOTE: I am getting all APIs keys from server, storing keys in snappy db and then assigning keys from snappy db to MyConstantInterface.

Asif Ullah
  • 61
  • 14

2 Answers2

1

STEP 1: Create a file named secrets.properties in the main folder (i.e below local.properties, app, build, gradle, README.md,etc.

STEP 2: Paste your API Key in secrets.properties (i.e GOOGLE_API_KEY, FACEBOOK_APP_ID, etc)

STEP 3: Sync the project or Rebuild. STEP 4: Open build.gradle (app) and create a def function to access the key declared in the secrets.properties.

def getApiKey(){
  def Properties props = new Properties()
  props.load(new FileInputStream(new File('secrets.properties')))
  return props['GOOGLE_MAPS_API_KEY']
}

STEP 5: Create a variable for the function getApiKey() in defaultConfig using manifestPlaceholders to use it in AndroidManifest.xml

defaultConfig {
    defaultPublishConfig 'debug'
    applicationId "YOUR_APPLICATION_ID"
    minSdkVersion 19
    targetSdkVersion 27
    versionCode 1000
    versionName '0.1.0'
    manifestPlaceholders = [ GOOGLE_MAPS_API_KEY:getApiKey()]
}

You’re good to go. Now GOOGLE_MAPS_API_KEY variable is public and can be used in AndroidManifest.xml like below

<meta-data
android:name="com.google.android.geo.API_KEY"
android:value="${GOOGLE_MAPS_API_KEY}" />

manifestPlaceholders — It helps to create a global variable that can be used only in AndroidManifest.xml

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

  
  applicationVariants.all { variant ->
    variant.buildConfigField "String", "GOOGLE_MAPS_API_KEY"
      , "\""+getApiKey()+"\""
  }
}

And, you can use GOOGLE_MAPS_API_KEY in Java or Kotlin classes like

BuildConfig.GOOGLE_MAPS_API_KEY

Finally, don’t forget to add secrets.properties to your .gitignore file.

Solution was gotten from This Medium post by Chandrasekar Kappusamy

Lone Wolf
  • 404
  • 3
  • 11
  • 1
    Great answer! But in fact you should use `props.load(new FileInputStream(rootProject.file('app.properties')))` for the file to be found. – SaPropper Oct 17 '21 at 20:29
0

You simply can not simply use a java variable.

Instead of it, You need to inject build variables into the manifest

Declaration: 

defaultConfig {
    ...
    manifestPlaceholders = [MAPS_API_KEY_FOR_MANIFEST: "your_maps_key_here"] // TO use in manifest file
    buildConfigField "String", "MAPS_API_KEY", '"your_maps_key_here"' // TO use in java file
}

Use in AndroidManifest.xml:

    <meta-data
        android:name="com.google.android.geo.API_KEY"
        android:value= "${MAPS_API_KEY_FOR_MANIFEST}" />

Java file Usage:

BuildConfig.MAPS_API_KEY

For more information, You can have a look at this and this.

Rumit Patel
  • 8,830
  • 18
  • 51
  • 70