Изменил название пакета, начал работу по регистрации магазина

android/app/build.gradle

@@ -15,18 +15,17 @@ apply plugin: 'com.android.application'
 apply from: "$flutterRoot/packages/flutter_tools/gradle/flutter.gradle"
 
 android {
-    compileSdkVersion 25
-    buildToolsVersion '25.0.3'
+    compileSdkVersion 21
+    buildToolsVersion '21.0.0'
 
     lintOptions {
         disable 'InvalidPackage'
     }
 
     defaultConfig {
+        targetSdkVersion 21
         testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
-
-        // TODO: Specify your own unique Application ID (https://developer.android.com/studio/build/application-id.html).
-        applicationId "com.yourcompany.checker"
+        applicationId "com.dinnect.checker"
     }
 
     buildTypes {
@@ -48,7 +47,7 @@ flutter {
 
 dependencies {
     compile fileTree(dir: 'libs', include: ['*.jar'])
-    androidTestCompile 'com.android.support:support-annotations:25.4.0'
+    androidTestCompile 'com.android.support:support-annotations:21.0.0'
     androidTestCompile 'com.android.support.test:runner:0.5'
     androidTestCompile 'com.android.support.test:rules:0.5'
 }