本篇文章給大家分享的是有關(guān)Flutter中怎么自定義Plugin,小編覺得挺實用的,因此分享給大家學(xué)習(xí),希望大家閱讀完這篇文章后可以有所收獲,話不多說,跟著小編一起來看看吧。
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1.在Android Studio 中創(chuàng)建一個Flutter Plugin 項目,如下圖
上圖中你能看到項目描述中寫到,如果需要暴露Andorid或iOS的API給開發(fā)者時,選擇"Plugin"項目類型。這個項目我們命名為:flutter_native_log_plugin, 當(dāng)我們完成創(chuàng)建項目后,有兩個文件我們需要看一看, 一個是位于android/src下的FlutterNativeLogPlugin.java, 這段代碼是用來和本地設(shè)備交互,然后將交互結(jié)果返回供flutter前端調(diào)用, 如下所示:
package com.cube8.flutter_native_log_plugin;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;/** FlutterNativeLogPlugin */public class FlutterNativeLogPlugin implements MethodCallHandler { /** Plugin registration. */ public static void registerWith(Registrar registrar) { final MethodChannel channel = new MethodChannel(registrar.messenger(), "flutter_native_log_plugin"); channel.setMethodCallHandler(new FlutterNativeLogPlugin()); } @Override public void onMethodCall(MethodCall call, Result result) { if (call.method.equals("getPlatformVersion")) { result.success("Android " + android.os.Build.VERSION.RELEASE); } else { result.notImplemented(); } }}
另一個 /lib/mian.dart文件,這段代碼是主要用來和native代碼交互, 如下所示:
import 'dart:async';import 'package:flutter/services.dart';class FlutterNativeLogPlugin { static const MethodChannel _channel = const MethodChannel('flutter_native_log_plugin'); static Future<String> get platformVersion async { final String version = await _channel.invokeMethod('getPlatformVersion'); return version; }}
2.現(xiàn)在我們開始編寫我們的Plugin.
在lib/flutter_native_log_plugin.dart 文件中,我們先創(chuàng)建一個新的方法,代碼如下:
import 'dart:async';import 'package:flutter/material.dart';import 'package:flutter/services.dart';enum Log { DEBUG, WARNING, ERROR }class FlutterNativeLogPlugin { static const MethodChannel _channel = const MethodChannel('flutter_native_log_plugin'); static Future<String> printLog( {Log logType, @required String tag, @required String msg}) async { String log = "debug"; if (logType == Log.WARNING) { log = "warning"; } else if (logType == Log.ERROR) { log = "error"; } else { log = "debug"; } final Map<String, dynamic> params = <String, dynamic>{ 'tag': tag, 'msg': msg, 'logType': log }; final String result = await _channel.invokeMethod('printLog', params); return result; }}
在Android端,我們將android/src下的FlutterNativePlugin.java改寫如下:
package com.cube8.flutter_native_log_plugin;import android.util.Log;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;/** * FlutterNativeLogPlugin */public class FlutterNativeLogPlugin implements MethodCallHandler { /** * Plugin registration. */ public static void registerWith(Registrar registrar) { final MethodChannel channel = new MethodChannel(registrar.messenger(), "flutter_native_log_plugin"); channel.setMethodCallHandler(new FlutterNativeLogPlugin()); } @Override public void onMethodCall(MethodCall call, Result result) { if (call.method.equals("printLog")) { String msg = call.argument("msg"); String tag = call.argument("tag"); String logType = call.argument("logType"); if (logType.equals("warning")) { Log.w(tag, msg); } else if (logType.equals("error")) { Log.e(tag, msg); } else { Log.d(tag, msg); } result.success("Logged Successfully!"); } else { result.notImplemented(); } }}
3.測試plugin。當(dāng)開發(fā)完了我們的plugin之后,我們需要測試這個新plugin是否可用,于是對example/lib的main.dart文件作如下修改:
import 'package:flutter/material.dart';import 'package:flutter_native_log_plugin/flutter_native_log_plugin.dart';void main() => runApp(MyApp());class MyApp extends StatefulWidget { @override _MyAppState createState() => _MyAppState();}class _MyAppState extends State<MyApp> { @override void initState() { super.initState(); } void printLogs() async { print(await FlutterNativeLogPlugin.printLog( tag: "Debug", msg: "This is ordinary Log")); // default logType print(await FlutterNativeLogPlugin.printLog( tag: "Debug", msg: "This is warning Log", logType: Log.WARNING)); // logType = warning print(await FlutterNativeLogPlugin.printLog( tag: "Debug", msg: "This is error Log", logType: Log.ERROR)); // logType = error print(await FlutterNativeLogPlugin.printLog( tag: "Debug", msg: "This is debug Log", logType: Log.DEBUG)); // logType = debug } @override Widget build(BuildContext context) { return MaterialApp( home: Scaffold( appBar: AppBar( title: const Text('Plugin example app'), ), body: Center( child: RaisedButton( child: Text("PrintLogs"), onPressed: printLogs, ), ), ), ); }}
點擊app中的按鈕,控制臺將看到如下輸出,說明plugin可以順利運行了。
4.最后一步就是將我們開發(fā)的plugin發(fā)布到dart pub供以后直接調(diào)用。打開控制臺,需要確認定位到plugin項目的根目錄,然后輸入如下命令:
flutter packages pub publish --dry-run
這段命令會做一個程序相關(guān)文件和信息的檢查,確保待發(fā)布的plugin信息完整,根據(jù)控制臺的提示完善信息后,與下圖相似:
接著輸入如下命令,正式將plugin發(fā)布到dart pub中:
flutter packages pub publish
以上就是Flutter中怎么自定義Plugin,小編相信有部分知識點可能是我們?nèi)粘9ぷ鲿姷交蛴玫降?。希望你能通過這篇文章學(xué)到更多知識。更多詳情敬請關(guān)注創(chuàng)新互聯(lián)行業(yè)資訊頻道。
本文題目:Flutter中怎么自定義Plugin
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