【Flutter】Flutter 混合开发 ( 关联 Android 工程与 Flutter 工程 | 安卓页面中嵌入 Flutter 页面 | 安卓中启动 Flutter 页面 )

rootProject.name = "flutter_native"
include ':app'
setBinding(new Binding([gradle: this]))
evaluate(new File(
        settingsDir.parentFile,
        'flutter_module/.android/include_flutter.groovy'
))
include ':flutter_module'
project(':flutter_module').projectDir = new File('../flutter_module')

// Flutter 最低支持版本是 16
minSdkVersion 18

// 在 settings.gradle 中配置的脚本 , 会自动关联到 Flutter 模块
implementation project(':flutter')

plugins {
    id 'com.android.application'
}

android {
    compileSdkVersion 30
    buildToolsVersion "30.0.3"

    defaultConfig {
        applicationId "com.example.flutter_native"
        // Flutter 最低支持版本是 16
        minSdkVersion 18
        targetSdkVersion 30
        versionCode 1
        versionName "1.0"

        testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner"
    }

    buildTypes {
        release {
            minifyEnabled false
            proguardFiles getDefaultProguardFile('proguard-android-optimize.txt'), 'proguard-rules.pro'
        }
    }
    compileOptions {
        sourceCompatibility JavaVersion.VERSION_1_8
        targetCompatibility JavaVersion.VERSION_1_8
    }
}

dependencies {

    implementation 'androidx.appcompat:appcompat:1.3.1'
    implementation 'com.google.android.material:material:1.4.0'
    implementation 'androidx.constraintlayout:constraintlayout:2.1.0'
    testImplementation 'junit:junit:4.+'
    androidTestImplementation 'androidx.test.ext:junit:1.1.3'
    androidTestImplementation 'androidx.test.espresso:espresso-core:3.4.0'

    // 在 settings.gradle 中配置的脚本 , 会自动关联到 Flutter 模块
    implementation project(':flutter')
}

<activity
    android:name="io.flutter.embedding.android.FlutterActivity"
    android:configChanges="orientation|keyboardHidden|keyboard|screenSize|locale|layoutDirection|fontScale|screenLayout|density|uiMode"
    android:hardwareAccelerated="true"
    android:windowSoftInputMode="adjustResize" />

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.example.flutter_native">

    <application
        android:allowBackup="true"
        android:icon="@mipmap/ic_launcher"
        android:label="@string/app_name"
        android:roundIcon="@mipmap/ic_launcher_round"
        android:supportsRtl="true"
        android:theme="@style/Theme.Flutter_native">
        <activity android:name=".MainActivity">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
        <activity
            android:name="io.flutter.embedding.android.FlutterActivity"
            android:configChanges="orientation|keyboardHidden|keyboard|screenSize|locale|layoutDirection|fontScale|screenLayout|density|uiMode"
            android:hardwareAccelerated="true"
            android:windowSoftInputMode="adjustResize" />
    </application>

</manifest>

findViewById(R.id.flutter1).setOnClickListener(new View.OnClickListener() {
    @Override
    public void onClick(View v) {
        FragmentTransaction fragmentTransaction =
                getSupportFragmentManager().beginTransaction();
        // 创建 FlutterFragment
        fragmentTransaction.replace(R.id.frame, FlutterFragment.createDefault());
        fragmentTransaction.commit();
    }
});

findViewById(R.id.flutter2).setOnClickListener(new View.OnClickListener() {
    @Override
    public void onClick(View v) {
        Intent intent = FlutterActivity
                .withNewEngine()
                .initialRoute("Android 启动 FlutterActivity")
                .build(MainActivity.this);
        //intent.putExtra("initParams", "Android 中 Activity 启动 Flutter");
        startActivity(intent);
    }
});

package com.example.flutter_native;

import androidx.appcompat.app.AppCompatActivity;
import androidx.fragment.app.FragmentTransaction;

import android.content.Intent;
import android.os.Bundle;
import android.view.View;

import io.flutter.embedding.android.FlutterActivity;
import io.flutter.embedding.android.FlutterFragment;

public class MainActivity extends AppCompatActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        findViewById(R.id.flutter1).setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                FragmentTransaction fragmentTransaction =
                        getSupportFragmentManager().beginTransaction();
                // 创建 FlutterFragment
                fragmentTransaction.replace(R.id.frame, FlutterFragment.createDefault());
                fragmentTransaction.commit();
            }
        });

        findViewById(R.id.flutter2).setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                Intent intent = FlutterActivity
                        .withNewEngine()
                        .initialRoute("Android 启动 FlutterActivity")
                        .build(MainActivity.this);
                //intent.putExtra("initParams", "Android 中 Activity 启动 Flutter");
                startActivity(intent);
            }
        });

    }
}

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

void main() => runApp(
    /// 该构造方法中传入从 Android 中传递来的参数
    MyApp(initParams: window.defaultRouteName,)
);

class MyApp extends StatelessWidget {
  /// 这是从 Android 中传递来的参数
  final String initParams;
  /// 构造方法 , 获取从 Android 中传递来的参数
  const MyApp({Key? key, required this.initParams}):super(key: key);

  // This widget is the root of your application.
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Flutter Demo',
      theme: ThemeData(
        primarySwatch: Colors.blue,
      ),
      home: MyHomePage(title: initParams),
    );
  }
}

class MyHomePage extends StatefulWidget {
  MyHomePage({Key? key, required this.title}) : super(key: key);
  final String title;

  @override
  _MyHomePageState createState() => _MyHomePageState();
}

class _MyHomePageState extends State<MyHomePage> {
  int _counter = 0;

  void _incrementCounter() {
    setState(() {
      _counter++;
    });
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text(widget.title),
      ),
      body: Center(
        child: Column(
          mainAxisAlignment: MainAxisAlignment.center,
          children: <Widget>[
            Text(
              'You have pushed the button this many times:',
            ),
            Text(
              '$_counter',
              style: Theme.of(context).textTheme.headline4,
            ),
          ],
        ),
      ),
      floatingActionButton: FloatingActionButton(
        onPressed: _incrementCounter,
        tooltip: 'Increment',
        child: Icon(Icons.add),
      ), // This trailing comma makes auto-formatting nicer for build methods.
    );
  }
}