hello_go

A new Flutter application to use aar lib(android) and framework(ios) create by gomobile. (android and IOS both support!!!)

Getting Started

For help getting started with Flutter, view our online documentation.

How to run on IOS

Open the IOS folder with xcode , and Run!!!

How to run on Android

1.Make sure your Flutter is installed ok , check it with Flutter doctor like this.

$flutter doctor
Doctor summary (to see all details, run flutter doctor -v):
     [✓] Flutter (Channel master, v0.3.1-pre.7, on Mac OS X 10.13.4 17E199, locale zh-Hans-US)
     [✓] Android toolchain - develop for Android devices (Android SDK 27.0.3)
     [✓] iOS toolchain - develop for iOS devices (Xcode 9.3)
     [✓] Android Studio (version 3.1)
     [✓] VS Code (version 1.22.2)
     [✓] Connected devices (2 available)
     • No issues found!
     chaimdeiMac-2:hello_go chaim$ 

2a. Run with Android Studio or other IDE

2b. Run with Flutter commands when you need run on a device:

// cd to the root of project and run in termial    
// how to choose --target-platform  # [android-arm (default), android-arm64] #
// when you run in a arm64 device , you need choose --target-platform=android-arm64    
  $ flutter build apk --target-platform=android-arm64
  Initializing gradle...                                       0.9s
  Resolving dependencies...                                    0.8s
  Running 'gradlew assembleRelease'...                        24.7s

//connect you phone on USB
  $ flutter install  
      Initializing gradle...                                       1.1s
      Resolving dependencies...                                    1.1s
      Installing app.apk to OD103...
      Uninstalling old version...
      Installing build/app/outputs/apk/app.apk...                  4.7s

Known Bugs or Issues

this project will crash on x86 simulator of API 25/26 (Anroid 7.x) , i do not find a solution yet:
the similar bug is discussed to this #15925

 I/flutter: Observatory listening on http://127.0.0.1:40638/
 D/: HostConnection::get() New Host Connection established 0xa829de00, tid 18383
 D/EGL_emulation: eglMakeCurrent: 0x9aad7c20: ver 2 0 (tinfo 0x8987f460)
 I/Choreographer: Skipped 80 frames!  The application may be doing too much work on its main thread.
 D/EGL_emulation: eglMakeCurrent: 0xa8285240: ver 2 0 (tinfo 0xa8283710)
 A/libc: Fatal signal 6 (SIGABRT), code -6 in tid 18401 (ngzu365.hellogo)
 Application terminated.

If you want run on a device , you must build release apk use Flutter commands.   or you may get the following crash (when run or debug use IDE):

  E/AndroidRuntime: FATAL EXCEPTION: main
     Process: com.mashangzu365.hellogo, PID: 8836
     java.lang.UnsatisfiedLinkError: dalvik.system.PathClassLoader[DexPathList[[zip file "/data/app/com.mashangzu365.hellogo-2/base.apk", zip file "/data/app/com.mashangzu365.hellogo-2/split_lib_dependencies_apk.apk", zip file "/data/app/com.mashangzu365.hellogo-2/split_lib_slice_0_apk.apk", zip file "/data/app/com.mashangzu365.hellogo-2/split_lib_slice_1_apk.apk", zip file "/data/app/com.mashangzu365.hellogo-2/split_lib_slice_2_apk.apk", zip file "/data/app/com.mashangzu365.hellogo-2/split_lib_slice_3_apk.apk", zip file "/data/app/com.mashangzu365.hellogo-2/split_lib_slice_4_apk.apk", zip file "/data/app/com.mashangzu365.hellogo-2/split_lib_slice_5_apk.apk", zip file "/data/app/com.mashangzu365.hellogo-2/split_lib_slice_6_apk.apk", zip file "/data/app/com.mashangzu365.hellogo-2/split_lib_slice_7_apk.apk", zip file "/data/app/com.mashangzu365.hellogo-2/split_lib_slice_8_apk.apk", zip file "/data/app/com.mashangzu365.hellogo-2/split_lib_slice_9_apk.apk"],nativeLibraryDirectories=[/data/app/com.mashangzu365.hellogo-2/lib/arm64, /data/app/com.mashangzu365.hellogo-2/base.apk!/lib/arm64-v8a, /data/app/com.mashangzu365.hellogo-2/split_lib_dependencies_apk.apk!/lib/arm64-v8a, /data/app/com.mashangzu365.hellogo-2/split_lib_slice_0_apk.apk!/lib/arm64-v8a, /data/app/com.mashangzu365.hellogo-2/split_lib_slice_1_apk.apk!/lib/arm64-v8a, /data/app/com.mashangzu365.hellogo-2/split_lib_slice_2_apk.apk!/lib/arm64-v8a, /data/app/com.mashangzu365.hellogo-2/split_lib_slice_3_apk.apk!/lib/arm64-v8a, /data/app/com.mashangzu365.hellogo-2/split_lib_slice_4_apk.apk!/lib/arm64-v8a, /data/app/com.mashangzu365.hellogo-2/split_lib_slice_5_apk.apk!/lib/arm64-v8a, /data/app/com.mashangzu365.hellogo-2/split_lib_slice_6_apk.apk!/lib/arm64-v8a, /data/app/com.mashangzu365.hellogo-2/split_lib_slice_7_apk.apk!/lib/arm64-v8a, /data/app/com.mashangzu365.hellogo-2/split_lib_slice_8_apk.apk!/lib/arm64-v8a, /data/app/com.mashangzu365.hellogo-2/split_lib_slice_9_apk.apk!/lib/arm64-v8a, /system/lib64, /vendor/lib64]]] couldn't find "libflutter.so"
                 at java.lang.Runtime.loadLibrary0(Runtime.java:984)
                 at java.lang.System.loadLibrary(System.java:1554)              

Refrences: #Flutter doc: installing-a-release-apk-on-a-device #the reason why crash here

How to prepare gomobile enviroment for Flutter

For android:

Install NDK in Android Studio and config env (must):

#Installing+the+Android+NDK #NDK设置中文教程

  export PATH="$ANDROID_HOME/ndk-bundle:$PATH"
  export ANDROID_HOME="/Users/chaim/Library/Android/sdk/"
  export PATH="$ANDROID_HOME/platform-tools:$PATH"

Install go first and get gomobile package

$ go get golang.org/x/mobile/cmd/gomobile
$ gomobile init

get the hello example and bind it to your project.

$ go get golang.org/x/mobile/example/bind/hello  
$ gomobile bind -target=android golang.org/x/mobile/example/bind/hello
$ cp hello.aar ~/!!path-to!!/hello_go/android/hello/

Use aar module for your Flutter projecet.

a. File -> New -> New Module ... -> Import .JAR/.AAR Package find hello.aar and load it

b. In file !!path-to!!/app/build.gradle add line:

   dependencies {
     implementation project(':hello')
   }

c. Go Run!!! :)

For IOS :

please Ref https://github.com/golang/go/wiki/Mobile#building-and-deploying-to-ios