chore: Update snippet for consistent throughout docs. (#469)

snippets/app/build.gradle

@@ -1,33 +1,23 @@
-apply plugin: 'com.android.application'
-apply plugin: 'kotlin-android'
-apply plugin: 'kotlin-android-extensions'
+plugins {
+    id 'com.android.application'
+    id 'kotlin-android'
+    // [START maps_android_secrets_gradle_plugin]
+    id 'com.google.secrets_gradle_plugin' version '0.5'
+    // [END maps_android_secrets_gradle_plugin]
+}
 
-// [START maps_android_api_key_security_manifest_placeholder]
 android {
-    // [START_EXCLUDE silent]
     compileSdkVersion 30
     buildToolsVersion "29.0.3"
-    // [END_EXCLUDE]
     defaultConfig {
-        // [START_EXCLUDE]
         applicationId "com.google.maps.example"
         minSdkVersion 21
         targetSdkVersion 30
         versionCode 1
         versionName "1.0"
         testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner"
-        // [END_EXCLUDE]
-        // Set the properties within `local.properties` into a `Properties` class so that values
-        // within `local.properties` (e.g. Maps API key) are accessible in this file.
-        Properties properties = new Properties()
-        if (rootProject.file("local.properties").exists()) {
-            properties.load(rootProject.file("local.properties").newDataInputStream())
-        }
-
-        // Inject the Maps API key into the manifest
-        manifestPlaceholders = [ mapsApiKey : properties.getProperty("MAPS_API_KEY", "") ]
     }
-    // [START_EXCLUDE silent]
+
     buildTypes {
         release {
             minifyEnabled false
@@ -53,9 +43,7 @@ android {
         sourceCompatibility JavaVersion.VERSION_1_8
         targetCompatibility JavaVersion.VERSION_1_8
     }
-    // [END_EXCLUDE]
 }
-// [END maps_android_api_key_security_manifest_placeholder]
 
 dependencies {
     implementation fileTree(dir: "libs", include: ["*.jar"])
@@ -72,4 +60,8 @@ dependencies {
     v3Implementation 'com.google.android.libraries.maps:maps:3.1.0-beta'
 
     testImplementation 'junit:junit:4.13.2'
+}
+
+secrets {
+    defaultPropertiesFileName = 'local.defaults.properties'
 }

snippets/app/src/main/AndroidManifest.xml

@@ -28,7 +28,7 @@
     <!-- [START maps_android_api_key_security_manifest_metadata] -->
     <meta-data
         android:name="com.google.android.geo.API_KEY"
-        android:value="${mapsApiKey}" />
+        android:value="${MAPS_API_KEY}" />
     <!-- [END maps_android_api_key_security_manifest_metadata] -->
   </application>
 

snippets/build.gradle

@@ -6,7 +6,7 @@ buildscript {
         jcenter()
     }
     dependencies {
-        classpath "com.android.tools.build:gradle:4.0.1"
+        classpath "com.android.tools.build:gradle:4.1.2"
         classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlin_version"
 
         // NOTE: Do not place your application dependencies here; they belong

snippets/gradle/wrapper/gradle-wrapper.properties

@@ -1,6 +1,6 @@
-#Tue Aug 25 10:27:15 PDT 2020
+#Fri Feb 26 09:19:32 PST 2021
 distributionBase=GRADLE_USER_HOME
 distributionPath=wrapper/dists
 zipStoreBase=GRADLE_USER_HOME
 zipStorePath=wrapper/dists
-distributionUrl=https\://services.gradle.org/distributions/gradle-6.1.1-all.zip
+distributionUrl=https\://services.gradle.org/distributions/gradle-6.5-all.zip

snippets/local.defaults.properties

@@ -0,0 +1 @@
+MAPS_API_KEY=YOUR_API_KEY