flutter项目打包发布应用

flutter官方文档链接:https://flutterchina.club/android-release/
1.androidStudio在安卓模式下打开flutter项目，初次编译后目录结构如下:

2.修改app下manifests下AndroidManifest.xml文件

<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.hljlingan.app_4in1">
    <!-- io.flutter.app.FlutterApplication is an android.app.Application that
         calls FlutterMain.startInitialization(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="io.flutter.app.FlutterApplication"
        android:label="这里是打包应用后的app名"
        android:icon="@mipmap/ic_launcher">
        <activity
            android:name="这里是app的快照名"
            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="android.intent.action.MAIN"/>
                <category android:name="android.intent.category.LAUNCHER"/>
            </intent-filter>
        </activity>
        <!-- Don't delete the meta-data below.
             This is used by the Flutter tool to generate GeneratedPluginRegistrant.java -->
        <meta-data
            android:name="flutterEmbedding"
            android:value="2" />
    </application>
</manifest>

3.app快照名修改
打开flutter项目中的main.dart，修改title属性名

 MaterialApp(
      title: 'app的快照名称',

4.修改app的build.gradle文件

打开此gradle文件，安卓兼容版本说明

android {
    compileSdkVersion 28 //安卓编译的版本，调用api有超出安卓28的版本会编译报错

    sourceSets {
        main.java.srcDirs += 'src/main/kotlin'
    }

    lintOptions {
        disable 'InvalidPackage'
    }

    defaultConfig {
        // TODO: Specify your own unique Application ID (https://developer.android.com/studio/build/application-id.html).
        applicationId "app包名唯一的标识"
        minSdkVersion 16  //安卓兼容的最低版本
        targetSdkVersion 28 //安卓实际打包编译的版本
        versionCode flutterVersionCode.toInteger() //flutter项目版本号
        versionName flutterVersionName  //flutter项目版本名
        testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner"
    }

    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 signingConfigs.debug
        }
    }
}

点击次处打开安卓sdk版本对应

5.添加app的启动图标

打开此目录，将app的图标放置此目录下，可删除其他尺寸图标
6.app签名
（1）创建签名的密钥证书，appkey

build-生成一个apk
选择apk

创建apk路径

根据实际需要选择存放地址及创建文件名称

（2）生成apk后位置如下

（3）配置使用证书
安卓目录下创建key.pro[erties文件，打开文件，按照官方文档将代码粘入

storePassword=<password from previous step> //密码
keyPassword=<password from previous step> //密码
keyAlias=key //别名
storeFile=<location of the key store file, e.g. /Users/<user name>/key.jks> //地址

地址指向的位置是基于此文件的位置

7.配置安卓节点下build.gradle文件使用证书
在安卓节点上添加如下代码

def keystorePropertiesFile = rootProject.file("key.properties")
def keystoreProperties = new Properties()
keystoreProperties.load(new FileInputStream(keystorePropertiesFile))

修改release打包签名设置

修改代码如下：

signingConfigs {
    release {
        keyAlias keystoreProperties['keyAlias']
        keyPassword keystoreProperties['keyPassword']
        storeFile file(keystoreProperties['storeFile'])
        storePassword keystoreProperties['storePassword']
    }
}
buildTypes {
    release {
        signingConfig signingConfigs.release
    }
}

8.启用混淆配置
在app文件夹下创建proguard-rules.pro文件
添加flutter混淆配置

#Flutter Wrapper
-keep class io.flutter.app.** { *; }
-keep class io.flutter.plugin.**  { *; }
-keep class io.flutter.util.**  { *; }
-keep class io.flutter.view.**  { *; }
-keep class io.flutter.**  { *; }
-keep class io.flutter.plugins.**  { *; }

启用混淆配置，在app节点下的build.gradle文件配置

 			signingConfig signingConfigs.release

            minifyEnabled true
            useProguard true

            proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'

8.至此app打包编译前的配置修改完毕
9.执行命令打包
终端打开切换到flutter项目根目录中，执行flutter build apk命令
打包完成后会出现如下

10.到指定目录下查找安装包即可