Android flutter_plugin插件开发之使用第三方jar包

创建flutter_plugin项目

点击代码编辑窗口右上角Open for Editing in Android Studio

在新的窗口选择project目录

创建一个libs文件夹用来放第三方jar包

展开 flutter_plugin->Android 在此目录下创建libs文件夹用来存放jar包

复制测试用的jar包到flutter_plugin->Android->libs里面

添加后jar包长这样

build.gradle上添加配置引入AppTest.jar包

dependencies {
    implementation files('libs/AppTest.jar')
}

同步后此时会发现AppTest.jar可以正常使用了,也可以看到jar包里面的方法.如图

编写java代码调用jar包

打开Flutter_plugin->Android->src->main->java->com.example.flutter_plugin->FlutterPlugin.java
注释掉原来代码.添加以下代码如图:

编写dart文件创建方法

切换到第一个窗口
编写 flutter_plugin->lib->flutter_plugin.dart
注释原来代码,添加以下代码

  static Future get getResult async {
    //这个getResult就是调用我们之前在java代码编写getresult
    /***
     * if (call.method.equals("getResult"))
        {
        AppTest apptest = new AppTest();
        result.success(apptest.getResult());
        }
      */
    final String version = await _channel.invokeMethod('getResult');
    return version;
  }

编写main.dart

注释原来代码添加以下代码

import 'package:flutter/material.dart';
import 'dart:async';

import 'package:flutter/services.dart';
import 'package:flutter_plugin/flutter_plugin.dart';

void main() => runApp(MyApp());

class MyApp extends StatefulWidget {
  @override
  _MyAppState createState() => _MyAppState();
}

class _MyAppState extends State {
  //String _platformVersion = 'Unknown';
  String _appTestResult;
  @override
  void initState() {
    super.initState();
    //initPlatformState();
    getResult();
  }

  Future getResult() async {
    String appTestResult;
    appTestResult = await FlutterPlugin.getResult;
    setState(() {
      _appTestResult = appTestResult;
    });
  }

  // Platform messages are asynchronous, so we initialize in an async method.
  /*Future initPlatformState() async {
    String platformVersion;
    // Platform messages may fail, so we use a try/catch PlatformException.
    try {
      platformVersion = await FlutterPlugin.platformVersion;
    } on PlatformException {
      platformVersion = 'Failed to get platform version.';
    }

    // If the widget was removed from the tree while the asynchronous platform
    // message was in flight, we want to discard the reply rather than calling
    // setState to update our non-existent appearance.
    if (!mounted) return;

    setState(() {
      _platformVersion = platformVersion;
    });
  }*/

  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      home: Scaffold(
        appBar: AppBar(
          title: const Text('Plugin example app'),
        ),
        body: Center(
          //child: Text('Running on: $_platformVersion\n'),
            child: Text('Result =  $_appTestResult\n'),
        ),
      ),
    );
  }
}

此时会发现还有一个错误.是flutter_plugin_test.dart文件的…这个文件没啥用.直接注释错误后编译运行

运行结果如下.直接输出java包的good

到此就结束了.由于没有mac电脑.和mac测试的第三方库.暂时没有ios教程~
附上AppTest.jar包给大家练手
链接: https://pan.baidu.com/s/1bmAA9vLIdX7AF6HDqgcO3g 提取码: v3tu