【Flutter】自定义插件开发

1、创建工程

flutter create --org com.kinsomy --template=plugin -i swift -a kotlin hello 

• --org选项：指定您的组织
• --template选项：1、package 开发Dart包 2、plugin 创建插件包
• -i选项：iOS开发语言swift或者oc
• -a选项：Android开发语言java或者kotlin

目录介绍：

• lib/hello.dart:
  插件包的Dart API.
• android/src/main/java/com/yourcompany/​hello/HelloPlugin.java:
  插件包API的Android实现.
• ios/Classes/HelloPlugin.m:
  插件包API的ios实现.
• example/:
  一个依赖于该插件的Flutter应用程序，来说明如何使用它

2、Android Studio编辑Android插件包

首先终端运行

cd hello/example
flutter build apk

结构展示

Running Gradle task 'assembleRelease'...                                
                                                                
Removed unused resources: Binary resource data reduced from 46KB to 36KB: Removed 20%                              
Running Gradle task 'assembleRelease'...                                                                           
Running Gradle task 'assembleRelease'... Done                     207.4s (!)
✓ Built build/app/outputs/flutter-apk/app-release.apk (15.0MB).
localhost:example lc$ 

打开Android Studio，选择Open an existing Android Studio Project打开项目

截屏2020-06-09 下午3.15.22.png

package com.example.lchelper;

import androidx.annotation.NonNull;

import io.flutter.embedding.engine.plugins.FlutterPlugin;
import io.flutter.plugin.common.MethodCall;
import io.flutter.plugin.common.MethodChannel;
import io.flutter.plugin.common.MethodChannel.MethodCallHandler;
import io.flutter.plugin.common.MethodChannel.Result;
import io.flutter.plugin.common.PluginRegistry.Registrar;

 import android.app.Service;
 import android.content.Context;
 import android.content.pm.PackageInfo;
 import android.content.pm.PackageManager;
 import android.os.Build;
 import android.os.Vibrator;

 import java.util.HashMap;
 import java.util.Map;

/** LchelperPlugin */
public class LchelperPlugin implements FlutterPlugin, MethodCallHandler {
  private MethodChannel channel;

  @Override
  public void onAttachedToEngine(@NonNull FlutterPluginBinding flutterPluginBinding) {
    channel = new MethodChannel(flutterPluginBinding.getFlutterEngine().getDartExecutor(), "lchelper");
    channel.setMethodCallHandler(this);
  }
  public static void registerWith(Registrar registrar) {
    final MethodChannel channel = new MethodChannel(registrar.messenger(), "lchelper");
    channel.setMethodCallHandler(new LchelperPlugin());
  }

  @Override
  public void onMethodCall(@NonNull MethodCall call, @NonNull Result result) {
    if (call.method.equals("getPlatformVersion")) {
      result.success("Android " + android.os.Build.VERSION.RELEASE);
    } 
     else if (call.method.equals("PackageInfo")){
       //获取设备信息
         Map map = new HashMap<>();
         map.put("systemVersion", android.os.Build.VERSION.RELEASE);
         map.put("deviceType", android.os.Build.MODEL);
         map.put("deviceName", Build.DEVICE);
         result.success(map);
     }
    else {
      result.notImplemented();
    }
  }

  @Override
  public void onDetachedFromEngine(@NonNull FlutterPluginBinding binding) {
    channel.setMethodCallHandler(null);
  }
}

3、编辑iOS插件包

首先终端操作

cd hello/example
flutter build ios --no-codesign

截屏2020-06-09 下午4.14.41.png

编辑第三方https://blog.csdn.net/weixin_34162401/article/details/91390081

4、插件发布到pub

在发布之前，确保pubspec.yaml,、README.md以及CHANGELOG.md文件的内容都正确填写完毕。可以通过dry-run命令来看准备是否就绪。

flutter packages pub publish --dry-run

检查无误后，可以执行下面的命令，发布到Pub上。

flutter packages pub publish