Flutter插件开发之APK自动安装

作者: Yuzo | 来源:发表于2019-06-13 17:50 被阅读232次

    Flutter插件开发之APK自动安装

    本文适用于Android开发人员

    个人博客

    什么是Flutter Plugin

    Flutter Plugin是一种特殊的包,包含一个用Dart编写的API定义,结合Android和iOS的平台特定实现,从而达到二者兼容。

    • 应用的Flutter部分通过平台通道(platform channel)将消息发送到其应用程序的所在的宿主(iOS或Android)
    • 宿主监听的平台通道,并接收该消息。然后它会调用特定于该平台的API(使用原生编程语言) - 并将响应发送回客户端,即应用程序的Flutter部分
      使用平台通道在客户端(Flutter UI)和宿主(平台)之间传递消息,如下图所示


      enter image description here

    创建Flutter App

    相关代码见运行第一个Flutter App

    创建Flutter Plugin

    右键工程->New->Module,如下图所示


    enter image description here

    选择Flutter Plugin,点击Next,如下图所示


    enter image description here
    输入工程名(Project name),点击Next,如下图所示
    enter image description here

    输入包名(Package name),点击Finish,入下图所示


    enter image description here
    到此Flutter plugin创建完成。

    引入插件

    在工程目录下找到pubspec.yaml文件,在dev_dependencies添加如下依赖,如下图所示

    enter image description here
    相关代码如下
    dev_dependencies:
      flutter_test:
        sdk: flutter
      install_apk_plugin:
        path: install_apk_plugin
    

    获取版本号demo

    打开插件lib下的dart文件,会有平台自动生成的代码,具体是实现获取APP版本号,如下面代码所示

    class InstallApkPlugin {
      static const MethodChannel _channel =
          const MethodChannel('install_apk_plugin');
    
      static Future<String> get platformVersion async {
        final String version = await _channel.invokeMethod('getPlatformVersion');
        return version;
      }
    
    }
    

    java部分的代码如下面所示

    public class InstallApkPlugin implements MethodCallHandler {
        private static final String TAG = "InstallApkPlugin";
    
        private final Registrar registrar;
    
        /**
         * Plugin registration.
         */
        public static void registerWith(Registrar registrar) {
            final MethodChannel channel = new MethodChannel(registrar.messenger(), "install_apk_plugin");
            channel.setMethodCallHandler(new InstallApkPlugin(registrar));
        }
    
        private InstallApkPlugin(Registrar registrar) {
            this.registrar = registrar;
        }
    
        @Override
        public void onMethodCall(MethodCall call, Result result) {
            if (call.method.equals("getPlatformVersion")) {
                result.success("Android " + android.os.Build.VERSION.RELEASE);
            } else {
                result.notImplemented();
            }
        }
    
    }
    

    实现自动安装APK

    实现自动安装APK,需要从Flutter应用层传入一个APK安装包的地址到host层,dart代码如下所示:

    class InstallApkPlugin {
      static const MethodChannel _channel =
          const MethodChannel('install_apk_plugin');
    
      static Future<String> get platformVersion async {
        final String version = await _channel.invokeMethod('getPlatformVersion');
        return version;
      }
    
      static Future<bool> installApk(String path) async {
        final bool isSuccess = await _channel.invokeMethod('installApk', path);
        return isSuccess;
      }
    }
    

    java部分的代码如下所示

    public class InstallApkPlugin implements MethodCallHandler {
        private static final String TAG = "InstallApkPlugin";
    
        private final Registrar registrar;
    
        /**
         * Plugin registration.
         */
        public static void registerWith(Registrar registrar) {
            final MethodChannel channel = new MethodChannel(registrar.messenger(), "install_apk_plugin");
            channel.setMethodCallHandler(new InstallApkPlugin(registrar));
        }
    
        private InstallApkPlugin(Registrar registrar) {
            this.registrar = registrar;
        }
    
        @Override
        public void onMethodCall(MethodCall call, Result result) {
            if (call.method.equals("getPlatformVersion")) {
                result.success("Android " + android.os.Build.VERSION.RELEASE);
            } else if (call.method.equals("installApk")) {
                final String path = (String) call.arguments;
                Log.d(TAG, "installApk path is " + path);
            } else {
                result.notImplemented();
            }
        }
    }
    

    到此,host层就能获取到APK安装包的路径了,后面只需实现Android安装APK的代码逻辑即可,在日志下面添加如下代码

        File file = new File(path);
        installApk(file, registrar.context());
    

    installApk代码实现如下所示

        private void installApk(File apkFile, Context context) {
            Intent installApkIntent = new Intent();
            installApkIntent.setAction(Intent.ACTION_VIEW);
            installApkIntent.addCategory(Intent.CATEGORY_DEFAULT);
            installApkIntent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
    
            Uri apkUri = null;
            if (Build.VERSION.SDK_INT > Build.VERSION_CODES.M) {
                apkUri = FileProvider.getUriForFile(context, context.getPackageName() + ".fileprovider", apkFile);
                installApkIntent.addFlags(Intent.FLAG_GRANT_READ_URI_PERMISSION);
            } else {
                apkUri = Uri.fromFile(apkFile);
            }
            installApkIntent.setDataAndType(apkUri, "application/vnd.android.package-archive");
    
            if (context.getPackageManager().queryIntentActivities(installApkIntent, 0).size() > 0) {
                context.startActivity(installApkIntent);
            }
        }
    

    除此之外,还需修改AndroidManifest.xml内的代码,如下面代码所示

    <manifest xmlns:android="http://schemas.android.com/apk/res/android"
        xmlns:tools="http://schemas.android.com/tools"
        package="com.yuzo.install_apk_plugin">
    
        <uses-permission android:name="android.permission.REQUEST_INSTALL_PACKAGES" />
    
        <application>
            <!--provider start-->
            <provider
                android:name="androidx.core.content.FileProvider"
                tools:replace="android:authorities"
                android:authorities="com.yuzo.opengit.fileprovider"
                android:exported="false"
                android:grantUriPermissions="true">
                <meta-data
                    android:name="android.support.FILE_PROVIDER_PATHS"
                    tools:replace="android:resource"
                    android:resource="@xml/file_path" />
            </provider>
            <!--provider end-->
        </application>
    </manifest>
    

    file_path.xml放在res->xml文件夹下面,如下面代码所示

    <?xml version="1.0" encoding="utf-8"?>
    <paths xmlns:tools="http://schemas.android.com/tools"
        tools:ignore="ResourceName">
    
        <root-path
            name="root_path"
            path="." />
    
    </paths>
    

    运行代码如下图所示


    enter image description here

    源代码

    项目地址-OpenGit客户端

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