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1.Flutter SDK not found. Define location with flutter.sdk in the local.properties file.
Open File
解决：在.android下面增加local.properties，里面加入flutter.sdk=E:\flutter
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cannot resolve symbol binding 解决：
gradle-wrapper使用4.10.2 （5.1.1以下就可以）
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- C:\Project\teck_note\module_flutter.android\include_flutter.groovy (C:\Project\teck_note\module_flutter.android\include_flutter.groovy)
Open File
解决：把报错的路径复制到电脑文件管理器，会报错。
改到路径对了为止。
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4.Configuration with name 'default' not found
解决：settings.gradle中的工程下面，没有build.gradle
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5.重建.android文件夹
解决：删除.android ，之后flutter packages get
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6.webView选择
webview_flutter：官方，功能少
flutter_webview_plugin： 不在Flutter Widget Tree内
flutter_inappwebview 最终选用这个，上面两个要么加载复杂本地html不方便，要么和js交互不方便
flutter_inappwebview加载本地html，需要把html用到的所有层级的js和资源，加到pubspec.yaml里面；和js的交互是异步的
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7.混合开发
原先的混合开发方式已不再适用，现在用
FlutterEngine flutterEngine = new FlutterEngine(this);
// Start executing Dart code in the FlutterEngine.
flutterEngine.getDartExecutor().executeDartEntrypoint(
DartExecutor.DartEntrypoint.createDefault()
);
// Cache the pre-warmed FlutterEngine to be used later by FlutterFragment.
FlutterEngineCache
.getInstance()
.put(MethodChannelPlugin.ENGINE_ID, flutterEngine);
GeneratedPluginRegistrant.registerWith(flutterEngine);
MethodChannelPlugin.registerWith(flutterEngine);
}
FlutterFragment flutterFragment = FlutterFragment.withCachedEngine(MethodChannelPlugin.ENGINE_ID).build();
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8.open for editing in android studio 不见了
复制别的项目的android/[project_name]_android.iml
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9.提示升级embedded v2
https://github.com/flutter/flutter/wiki/Upgrading-pre-1.12-Android-projects
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10.无法运行profile模式
-- 把build.gradle中，debug和release的自定义配置信息（如multiDexEnabled buildConfigField），放到defaultConfig中一份。
-- android/app/src/profile/AndroidManifest.xml 中修改包名等
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11.devTools跑不起来，一直build in progress
尝试如下也不行
flutter pub global deactivate devtools
flutter pub cache repair
flutter pub global activate devtools
flutter pub global run devtools
进入报错目录，用老版本覆盖
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- as中dart analyze 失败，但是命令行可以编译过
解决：as中设置flutter sdk路径
//flutter 2.0时代
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13.直接run的release包，没有arm-v7的.so。couldn't find "libflutter.so"启动崩溃
常见的 无效的 解决办法：
1:gradle中设置 abiFilters指定v7，这种只在用as打开app目录build.gradle中有效
release {
ndk {
abiFilters 'armeabi-v7a'
}
}
2:local.properties中设置target-platform=android-arm
3: 其他命令行加参数等方法
解决：在sdk/flutter/packages/flutter_tools/gradle/flutter.gradle中
private List<String> getTargetPlatforms() {
if (!project.hasProperty('target-platform')) {
println("NO!!!!!!!!!!!!!!!!!target-platform")
return DEFAULT_PLATFORMS
}
return project.property('target-platform').split(',').collect {
println("split!!!!!!!!!!!!!!!!!target-platform $it\n")
if (!PLATFORM_ARCH_MAP[it]) {
throw new GradleException("Invalid platform: $it.")
}
return it
}
}
然后编译看日志结果。
app模块中apply from: "$flutterRoot/packages/flutter_tools/gradle/flutter.gradle"
把project传入给SDK的flutter.gradle
所以我们需要给app module中增加property
先在gradle.properties中设置target-platform=android-arm
然后在项目的根目录的build.gradle
rootProject.setProperty('target-platform', 'android-arm')
subprojects {
project.setProperty('target-platform', 'android-arm')
}
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14.直接run的debug包，couldn't find "libflutter.so"启动崩溃，即使apk中有对应.so
解决：检查各个子module中不能有其他格式的abiFilters
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15.ScrollAppBar配合listView滚动异常
滚不到最底
解决：延时100ms执行animateTo，动画duration要根据list长度大于100ms到1500ms
ListView逐渐边长，刚把SrollAppBar快顶出屏幕，ScrollAppBar异常跳动
解决：ListView高度不对，没有算进去ScrollAppBar
ListKey.currentContext.size.height不对
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16.语法小坑：
坑1：
dart的对象是引用传递
但是有一种情况不能传递。
class A{
Obj? obj;
classB.setValue(obj);//会给obj赋值
onDispose() {
obj?.dispose(); //obj一直是null
}
}
建议在A中初始化好obj
坑2：
static void send(String name, {Map<String, dynamic>? map}) {
if (map == null) map = {};
map.addAll({
"info": 'aaa',
});
send(name, map);
}
会报错type '_InternalLinkedHashMap<String, dynamic>' is not a subtype of type 'Map<String, Object>' in type cast
建议指明类型
Map<String, String> infoMap = {
"info": 'aaa',
};
map.addAll(infoMap);
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17.flutter compileDebugJavaWithJavac
cd /Applications/Android\ Studio.app/Contents/jre
ln -s ../jre jdk
ln -s "/Library/Internet Plug-Ins/JavaAppletPlugin.plugin" jdk
flutter doctor -v
