問(wèn)題
flutter工程如果依賴了第三方插件或本地插件，打包成aar集成到Android原生項(xiàng)目中會(huì)報(bào)Failed to call observer method，詳細(xì)日志如下：
java.lang.RuntimeException: Unable to start activity ComponentInfo{xxx.MainActivity}: java.lang.RuntimeException: Failed to call observer method
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2946)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:3081)
at android.app.servertransaction.LaunchActivityItem.execute(LaunchActivityItem.java:78)
at android.app.servertransaction.TransactionExecutor.executeCallbacks(TransactionExecutor.java:108)
at android.app.servertransaction.TransactionExecutor.execute(TransactionExecutor.java:68)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1831)
at android.os.Handler.dispatchMessage(Handler.java:106)
at android.os.Looper.loop(Looper.java:201)
at android.app.ActivityThread.main(ActivityThread.java:6806)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:547)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:873)
原因
用
flutter build aar或者flutter build apk打包aar的時(shí)候并沒有將第三方插件打包到flutter-release.aar里面
解決
一、初級(jí)解決
- 首先使用命令
flutter build aar
此時(shí)flutter工程和依賴的第三方插件會(huì)在flutter工程根目錄下的build/host/outputs/repo下分別生成aar，如圖所示
- 然后將這些
aar拷貝到Android原生工程進(jìn)行依賴即可
二、高級(jí)解決
利用fat-aar將這些aar合并打包成一個(gè)aar
參考flutter1.8打包aar上傳maven集成到原生android工程這篇文章對(duì)打包腳本做了一個(gè)簡(jiǎn)化。
腳本及工程demo:
https://github.com/duzzi/flutter_lib_test
我的運(yùn)行環(huán)境：
os：macOs
gradle plugin： classpath 'com.android.tools.build:gradle:3.2.1'
gradle：gradle-4.10.2-all
java：jdk1.8
flutter：stable, v1.9.1
ps：需要保證flutter工程中.android下的gradle、support包、minSdkVersion等版本一致。
thanks：
http://www.itdecent.cn/p/2258760e9540
https://juejin.im/post/5cd51f61f265da039c056e39
https://github.com/CarGuo/flutter_app_lib
