Flutter插件开发之APK自动安装

Flutter插件开发之APK自动安装

本文适用于Android开发人员

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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


    Flutter插件开发之APK自动安装_第1张图片
    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


Flutter插件开发之APK自动安装_第2张图片
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选择Flutter Plugin,点击Next,如下图所示


Flutter插件开发之APK自动安装_第3张图片
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输入工程名(Project name),点击Next,如下图所示
Flutter插件开发之APK自动安装_第4张图片
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输入包名(Package name),点击Finish,入下图所示


Flutter插件开发之APK自动安装_第5张图片
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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

Flutter插件开发之APK自动安装_第6张图片
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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 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 get platformVersion async {
    final String version = await _channel.invokeMethod('getPlatformVersion');
    return version;
  }

  static Future 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



    

    
        
        
            
        
        
    

file_path.xml放在res->xml文件夹下面,如下面代码所示




    


运行代码如下图所示


Flutter插件开发之APK自动安装_第7张图片
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源代码

项目地址-OpenGit客户端

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