How to publish Android apps using Flutter

<manifest xmlns:andro
    package=".gesture_demo">
    <!--  is an  that
         calls (this); in its onCreate method.
         In most cases you can leave this as-is, but you if you want to provide
         additional functionality it is fine to subclass or reimplement
         FlutterApplication and put your custom class here. -->
    <application
        android:name=""
        android:label="gesture_demo"
        android:icon="@mipmap/ic_launcher">
        <activity
            android:name=".MainActivity"
            android:launchMode="singleTop"
            android:theme="@style/LaunchTheme"
            android:configChanges="orientation|keyboardHidden|keyboard|screenSize|smallestScreenSize|locale|layoutDirection|fontScale|screenLayout|density|uiMode"
            android:hardwareAccelerated="true"
            android:windowSoftInputMode="adjustResize">
            <intent-filter>
                <action android:name=""/>
                <category android:name=""/>
            </intent-filter>
        </activity>
        <!-- Don't delete the meta-data below.
             This is used by the Flutter tool to generate  -->
        <meta-data
            android:name="flutterEmbedding"
            android:value="2" />
    </application>
</manifest>

<?xml version="1.0" encoding="utf-8"?>
<!-- Modify this file to customize your launch splash screen -->
<layer-list xmlns:andro>
    <item android:drawable="@android:color/white" />

    <!-- You can insert your own image assets here -->
    <!-- <item>
        <bitmap
            android:gravity="center"
            android:src="@mipmap/launch_image" />
    </item> -->
</layer-list>

<?xml version="1.0" encoding="utf-8"?>
<!-- Modify this file to customize your launch splash screen -->
<layer-list xmlns:andro>
  	<!-- Background color -->
    <item android:drawable="@android:color/white" />
		
  	<!-- Startup page picture，Other elements can also be added -->
    <item>
        <bitmap
            android:gravity="center"
            android:src="@mipmap/launch_image" />
    </item>
</layer-list>

<manifest xmlns:andro
    package=".animation_demo">

    <uses-permission android:name=""/>
    <uses-permission android:name=".ACCESS_WIFI_STATE"/>
    <uses-permission android:name=".ACCESS_NETWORK_STATE"/>
    
    <application
        android:name=""
        android:label="Animation Demo"
        android:icon="@mipmap/ic_launcher">
        <activity
            android:name=".MainActivity"
            android:launchMode="singleTop"
            android:theme="@style/LaunchTheme"
            android:configChanges="orientation|keyboardHidden|keyboard|screenSize|smallestScreenSize|locale|layoutDirection|fontScale|screenLayout|density|uiMode"
            android:hardwareAccelerated="true"
            android:windowSoftInputMode="adjustResize">
            <intent-filter>
                <action android:name=""/>
                <category android:name=""/>
            </intent-filter>
        </activity>
        <!-- Don't delete the meta-data below.
             This is used by the Flutter tool to generate  -->
        <meta-data
            android:name="flutterEmbedding"
            android:value="2" />
    </application>
</manifest>

android {
    compileSdkVersion 28

    sourceSets {
         += 'src/main/kotlin'
    }

    lintOptions {
        disable 'InvalidPackage'
    }

    defaultConfig {
        // TODO: Specify your own unique Application ID (/studio/build/).
        applicationId ".animation_demo"
        minSdkVersion 16
        targetSdkVersion 28
        versionCode ()
        versionName flutterVersionName
        testInstrumentationRunner ""
    }

    buildTypes {
        release {
            // TODO: Add your own signing config for the release build.
            // Signing with the debug keys for now, so `flutter run --release` works.
            signingConfig 
        }
    }
}

def flutterVersionCode = ('')
if (flutterVersionCode == null) {
    flutterVersionCode = '1'
}

def flutterVersionName = ('')
if (flutterVersionName == null) {
    flutterVersionName = '1.0'
}

#The ~/ is to store the keystore file in the ~/ directorykeytool -genkey -v -keystore ~/ -keyalg RSA -keysize 2048 -validity 10000 -alias key

Enter the keystore password:  
Enter a new password again: 
What is your first and last name?
  [Unknown]:  lag
What is your organizational unit name?
  [Unknown]:  island-coder
What is your organization name?
  [Unknown]:  RD
What is the name of your city or region?
  [Unknown]:  Coder
Your province/city/What is the name of the autonomous region?
  [Unknown]:  Island
The two letter country of the unit/What is the region code?
  [Unknown]:  CN
CN=lag, OU=island-coder, O=RD, L=Coder, ST=Island, C=CNIs it correct?
  [no]:  Y

Generating for the following objects 2,048 BitRSAKey pair and self-signed certificate (SHA256withRSA) (Validity period is 10,000 sky):
	 CN=lag, OU=island-coder, O=RD, L=Coder, ST=Island, C=CN
[In storage/Users/lag/]

storePassword={Keystore Password} #
keyPassword={Certificate Password}
keyAlias=key    #The alias corresponding to the command line -aliasstoreFile=/Users/lag/  #The corresponding path generated by the command

	signingConfigs {
        release {
            keyAlias keystoreProperties['keyAlias']
            keyPassword keystoreProperties['keyPassword']
            storeFile = file(keystoreProperties['storeFile'])
            storePassword = keystoreProperties['storePassword']
        }
    }

    buildTypes {
        release {
            // TODO: Add your own signing config for the release build.
            // Signing with the debug keys for now, so `flutter run --release` works.
            signingConfig 
            
        }
    }

flutter build apk

flutter clean