Flutter android 项目中添加Flutter

官方给出是不建议在原项目中集成 flutter

目前还是测试实验阶段

已有android 项目中集成 Flutter

The Flutter project template

使用flutter create xxx创建的Flutter项目包括用于Flutter / Dart代码的非常简单的 应用程序（Android单个Activity  和 iOS 单个 ViewController ）。您可以修改这些主机应用程序以满足您的需求并从那里构建。

The Flutter module template

但是，如果您开始使用任一平台的现有应用程序，您可能希望将Flutter项目作为某种形式的库包含在该应用程序中。

这就是Flutter模块模板提供的内容。执行 flutter create -t module xxx会生成一个Flutter项目，其中包含一个Android库和一个Cocoapods pod，专为现有主机应用程序使用而设计。

android 项目中集成 Flutter

Create a Flutter module

命令行创建

flutter create -t module flutter_mode

也可以使用android Studio 创建

flutter_mode 应用转化为库

修改flutter_mode 中 android/app/build.gradle

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apply plugin: 'com.android.application'
修改为
apply plugin: 'com.android.library'

删除 defaultConfig 中 applicationId

    defaultConfig {
        // TODO: Specify your own unique Application ID (https://developer.android.com/studio/build/application-id.html).
//        applicationId "com.example.fluttermode"
        minSdkVersion 16
        targetSdkVersion 27
        versionCode 1
        versionName "1.0"
        testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
    }

删除 flutter_mode 中 AndroidManifest.xml

删除 flutter_mode 中 android/app/src/main/AndroidManifest.xml
中多余的代码 intent-filter application 属性

 <application >
    <activity
        android:name=".MainActivity"
        android:launchMode="singleTop"
        android:theme="@style/LaunchTheme"
        android:configChanges="orientation|keyboardHidden|keyboard|screenSize|locale|layoutDirection|fontScale|screenLayout|density"
        android:hardwareAccelerated="true"
        android:windowSoftInputMode="adjustResize">
        <!-- This keeps the window background of the activity showing
             until Flutter renders its first frame. It can be removed if
             there is no splash screen (such as the default splash screen
             defined in @style/LaunchTheme). -->
        <meta-data
            android:name="io.flutter.app.android.SplashScreenUntilFirstFrame"
            android:value="true" />

    </activity>
</application>

修改 MainActivity.java

public class MainActivity extends FlutterActivity {
  @Override
  protected void onCreate(Bundle savedInstanceState) {
    io.flutter.view.FlutterMain.startInitialization(this.getApplicationContext());  // <= New.
    super.onCreate(savedInstanceState);
    GeneratedPluginRegistrant.registerWith(this);
  }
}

android Native 项目引用

修改 Native 工程目录中 settings.gradle 文件

1 2	include ':flutter_mode' project(':flutter_mode').projectDir = new File( 'flutter_mode/flutter_mode/android/app')

修改 Native 项目目录中 build.gradle 文件

1	implementation project(":flutter_mode")

修改 Native 工程项目中 local.properties 文件

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ndk.dir=/Users/kylinhuang/androidStudioSDK/ndk-bundle
sdk.dir=/Users/kylinhuang/androidStudioSDK
flutter.sdk=/Users/kylinhuang/software/flutter

调用

public void startFlutterActivity(View view) {
    
//                ComponentName componentName = new ComponentName(this, "com.example.fluttermode.MainActivity");
//                Intent intent = new Intent().setComponent(componentName);
//                startActivity(intent);

    Intent intent = new Intent(getActivity(), com.example.fluttermode.MainActivity.class);
                startActivity(intent);
}

启动过程有点慢
先白屏再渲染出来

使用release 版本运行起来比较快

java.lang.UnsatisfiedLinkError: dalvik.system.PathClassLoader[DexPathList[[zip file "/data/app/com.sengled.Snap-1/base.apk"],nativeLibraryDirectories=[/data/app/com.sengled.Snap-1/lib/arm, /data/app/com.sengled.Snap-1/base.apk!/lib/armeabi, /system/lib, /vendor/lib]]] couldn't find "libflutter.so"
        at java.lang.Runtime.loadLibrary0(Runtime.java:984)
        at java.lang.System.loadLibrary(System.java:1530)
        at io.flutter.view.FlutterMain.startInitialization(FlutterMain.java:163)
        at io.flutter.view.FlutterMain.startInitialization(FlutterMain.java:140)
        at com.example.fluttermode.MainActivity.onCreate(MainActivity.java:10)

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No application found for TargetPlatform.android_arm.
Is your project missing an android/app/src/main/AndroidManifest.xml?
Consider running "flutter create ." to create one.

第一次遇到更新 flutter 就可以了
又遇见了怎么都不好使无奈之下删除 android 目录 ios目录

直接运行

flutter create .

再git 恢复配置问题

android Flutter 10.Native 项目中添加Flutter