0. 前言

Flare 是 2dimensions 提供的一个新的动画工具，动画很炫酷
，决定调研一下看看如何集成到项目中。
Flare目前支持flutter，所以工作有下面两部分

1. 现有项目集成Flutter
2. 原生调用Flutter方法

1. 集成Flutter到现有项目

https://github.com/flutter/flutter/wiki/Add-Flutter-to-existing-apps

1.1 创建Flutter module

我的Demo路径为 ~/workspace/FlareDemo

cd ~/worksapce
flutter create -t module keep_flare

image.png

$ cd .android/
$ ./gradlew flutter:assembleDebug

通过上述命名获得module的aar文件，路径如下.android/Flutter/build/outputs/aar/flutter-debug.aar

1.2 Flutter module继承

1. FlareDemo/app/build.gradle

    compileOptions {
        sourceCompatibility JavaVersion.VERSION_1_8
        targetCompatibility JavaVersion.VERSION_1_8
    }

2. FlareDemo/settings.gradle

include ':app'                                     // assumed existing content
setBinding(new Binding([gradle: this]))                                 // new
evaluate(new File(                                                      // new
  settingsDir.parentFile,                                               // new
  'keep_flare/.android/include_flutter.groovy'                          // new
))                                                                      // new

引入keep_flare项目下的Flutter module

3. FlareDemo/app/build.gradle

dependencies {
  implementation project(':flutter')
}

4. 注意事项
   如果你的app使用了androidx，那么flutter module也需要使用androidx（默认情况下没有使用androidx）
   keep_flare/pubspec.yaml

  module:
    androidX: true
    androidPackage: com.example.keep_flare
    iosBundleIdentifier: com.example.keepFlare

将这里修改成androidx: true

2.Flutter module(keep_flare)开发

2.1 通过FlutterView来调用

main.dart

void main() => runApp(_widgetForRoute(window.defaultRouteName));

Widget _widgetForRoute(String route) {
  switch (route) {
    case 'flare_teddy':
      return TeddyView();
  }
}

通过不同的routeName对应不同的View

2.2 添加Flare

1. 添加依赖

dependencies:
  flutter:
    sdk: flutter

  flare_flutter: ^1.5.4

flutter:
  assets:
    - assets/

2. 从flare sample下载flr文件和teddy_controller.dart

3. 创建teddy_view.dart，里面添加MethodChannel获得原生端发送的消息
   关于MethodChannel可以看这个文章

import 'package:flare_flutter/flare_actor.dart';
import 'package:flutter/cupertino.dart';
import 'package:flutter/services.dart';
import 'package:keep_flare/teddy_controller.dart';

class TeddyView extends StatefulWidget {
  @override
  _TeddyViewState createState() => _TeddyViewState();
}

class _TeddyViewState extends State<TeddyView> {
  TeddyController _teddyController;
  MethodChannel _channel;

  @override
  void initState() {
    _teddyController = TeddyController();
    _initChannel();
    super.initState();
  }

  _initChannel() {
    this._channel = MethodChannel("com.gotokeep.keep.plugins.flare");

    Future<dynamic> handler(MethodCall call) async {
      print("========kt call flutter " + call.toString());
      print(call.arguments.toString());
      print(call.arguments.runtimeType.toString());
      switch (call.method) {
        case "lookAt":
          _lookAt(call.arguments["dx"], call.arguments["dy"]);
          break;
        case "coverEyes":
          _coverEyes(call.arguments["cover"]);
          break;
        case "setPassword":
          _setPassword(call.arguments["password"]);
          break;
        case "submitPassword":
          _submitPassword();
          break;
      }
    }

    this._channel.setMethodCallHandler(handler);
  }

  _lookAt(double x, double y) {
    _teddyController.lookAt(Offset(x, y));
  }

  _setPassword(String value) {
    _teddyController.setPassword(value);
  }

  _coverEyes(bool cover) {
    _teddyController.coverEyes(cover);
  }

  _submitPassword() {
    _teddyController.submitPassword();
  }

  @override
  Widget build(BuildContext context) {
    return Container(
        color: Color(0xFFFFFFFF),
        child: FlareActor(
          "assets/Teddy.flr",
          shouldClip: false,
          alignment: Alignment.bottomCenter,
          fit: BoxFit.contain,
          controller: _teddyController,
        ));
  }
}

3. Demo开发

1. FlarePlugin.kt 用于和Flutter交互

class FlarePlugin(flutterView: FlutterView) : MethodChannel.MethodCallHandler {

    private var channel: MethodChannel

    init {
        channel = MethodChannel(flutterView, CHANNEL)
        channel.setMethodCallHandler(this)
    }

    /**
     * 发送flutter方法
     */
    fun sendMessage(methodName: String, arguments: Map<String,Any>){
        android.util.Log.e("liang", "call flutter methodName=$methodName, arguments=$arguments")
        channel.invokeMethod(methodName, arguments)
    }

    /**
     * 接收flutter端请求的方法
     */
    override fun onMethodCall(call: MethodCall, result: MethodChannel.Result) {
        android.util.Log.e("liang", "flutter call kt")
        when (call.method) {
        }
    }

    companion object {
        private const val CHANNEL = "com.tesla1984.plugins.flare"
    }
}

2. TeddyFlareView.kt 封装具体的TeddyView里面的方法

package com.github.flaredemo

import androidx.fragment.app.FragmentActivity
import com.gotokeep.keep.fd.utils.FlarePlugin
import io.flutter.view.FlutterView

class TeddyFlareView(activity: FragmentActivity, route: String) {
    var flutterView: FlutterView = Flutter.createView(activity, activity.lifecycle, route)
    private var flarePlugin: FlarePlugin

    init {
        flarePlugin = FlarePlugin(flutterView)
    }

    fun setBackground(backgroudColor: Int) {
        sendMessage(
            "setBackground", mapOf(
                "backgroundColor" to backgroudColor
            )
        )
    }

    fun coverEyes(cover: Boolean) {
        sendMessage(
            "coverEyes", mapOf("cover" to cover)
        )
    }

    fun lookAt(dx: Double, dy: Double) {
        sendMessage(
            "lookAt", mapOf(
                "dx" to dx,
                "dy" to dy
            )
        )
    }

    fun setPassword(password: String) {
        sendMessage(
            "setPassword", mapOf(
                "password" to password
            )
        )
    }

    fun submitPassword() {
        sendMessage("submitPassword", emptyMap())
    }

    private fun sendMessage(methodName: String, arguments: Map<String, Any>) {
        flarePlugin.sendMessage(methodName, arguments)
    }
}

3. MainActivity.kt

class MainActivity : AppCompatActivity() {

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_main)

        initView()
    }

    private fun initView() {
        val frameLayout = findViewById<FrameLayout>(R.id.frameLayout)
        val flareViewHelper = TeddyFlareView(this, "flare_teddy")
        frameLayout.addView(flareViewHelper.flutterView)
        flareViewHelper.setBackground(0xFFE53935.toInt())

        findViewById<EditText>(R.id.editText).let {
            it.addTextChangedListener(object : TextWatcher {
                override fun afterTextChanged(s: Editable?) {
                }

                override fun beforeTextChanged(s: CharSequence?, start: Int, count: Int, after: Int) {
                }

                override fun onTextChanged(s: CharSequence?, start: Int, before: Int, count: Int) {
                    val pair = getLocation(it)
                    flareViewHelper.lookAt(pair.first, pair.second)
                }

            })
        }
        findViewById<EditText>(R.id.editText2).let {
            it.setOnFocusChangeListener { _, hasFocus ->
                flareViewHelper.coverEyes(hasFocus)
            }

            it.addTextChangedListener(object : TextWatcher {
                override fun afterTextChanged(s: Editable?) {
                    flareViewHelper.setPassword(s.toString())
                }

                override fun beforeTextChanged(s: CharSequence?, start: Int, count: Int, after: Int) {
                }

                override fun onTextChanged(s: CharSequence?, start: Int, before: Int, count: Int) {
                }

            })
        }
        findViewById<Button>(R.id.button).setOnClickListener {
            flareViewHelper.submitPassword()
        }
    }

    fun getLocation(editText: EditText): Pair<Double, Double> {
        val pos = editText.selectionStart
        val layout = editText.layout
        val x = layout.getPrimaryHorizontal(pos).toDouble()

        val location = IntArray(2)
        editText.getLocationInWindow(location)

        return Pair(x, location[1].toDouble())
    }


}

最终效果

1. 输入用户名字Teddy眼睛会跟着动
2. 输入密码Teddy会闭上眼睛
3. 输入密码错误，正确不同反应

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