Add permissions and signing config (don't forget to create key.props!)

android/app/build.gradle

@@ -1,3 +1,11 @@
+def keyProps = new Properties()
+def keyPropsFile = rootProject.file('key.properties')
+if (keyPropsFile.exists()) {
+    keyPropsFile.withReader('UTF-8') { reader ->
+        keyProps.load(reader)
+    }
+}
+
 def localProperties = new Properties()
 def localPropertiesFile = rootProject.file('local.properties')
 if (localPropertiesFile.exists()) {
@@ -42,6 +50,19 @@ android {
         main.java.srcDirs += 'src/main/kotlin'
     }
 
+    signingConfigs {
+        release {
+            storeFile file(keyProps.RELEASE_STORE_FILE)
+            storePassword keyProps.RELEASE_STORE_PASSWORD
+            keyAlias keyProps.RELEASE_KEY_ALIAS
+            keyPassword keyProps.RELEASE_KEY_PASSWORD
+
+            // Optional, specify signing versions used
+            v1SigningEnabled true
+            v2SigningEnabled true
+        }
+    }
+
     defaultConfig {
         // TODO: Specify your own unique Application ID (https://developer.android.com/studio/build/application-id.html).
         applicationId "com.example.huacu_mobile"
@@ -55,9 +76,7 @@ android {
 
     buildTypes {
         release {
-            // TODO: Add your own signing config for the release build.
+            signingConfig signingConfigs.release
-            // Signing with the debug keys for now, so `flutter run --release` works.
-            signingConfig signingConfigs.debug
         }
     }
 }

android/app/src/main/AndroidManifest.xml

@@ -1,5 +1,6 @@
 <manifest xmlns:android="http://schemas.android.com/apk/res/android"
     package="com.example.huacu_mobile">
+    <uses-permission android:name="android.permission.INTERNET"/>
    <application
         android:label="huacu_mobile"
         android:name="${applicationName}"