Set up the flutter environment pit collection

build flutter Environment used 4 One afternoon , It can be said that life has reached a climax . hear tell mac It's better to match the environment , But I use windows, alas , Basically, all the pits we should encounter have been walked once . I won't talk about building an environment , You can watch the video of technology fat in b On the site , Just talk about the pit you encountered , Come to the text .

Question 1 ： Yes get packages Third party package problem . Without this, the code will directly report errors in the compiler environment , There are two ways to get , The first is to climb over the wall , The requirements for ladders in this way are still a little high , Not recommended . The second is flutter Special care for domestic users , Setting the image source can solve the problem .

FLUTTER_STORAGE_BASE_URL = https://storage.flutter-io.cn
PUB_HOSTED_URL = https://pub.flutter-io.cn

It is strongly recommended to turn off the computer here , Reopen when encountering flutter create project The project fails or the compiler get packages When the third party reports an error .

Question two Plugin with id 'kotlin-android' not found I have solved this mistake for a long time , I got the answer after others helped me solve the problem . This is because there is no correct introduction kotlin-android Errors caused by plug-ins

First step ： In the project android\app Under the table of contents build.gradle File insert , See clearly that it is in app This file in the directory

apply plugin: 'kotlin-android'

This code

The effect picture is shown above
The second step Project androd There is also a build.gradle file , Open and add the following two pieces of code in a fixed position

 ext.kotlin_version = '1.3.50'

 classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlin_version"

Notice that the first piece of code is outside that object , I put it in the wrong position during debugging , Led to more holes . This problem has been solved without accident .

Question 3 ： Others may report this error , I don't seem to have encountered this problem , Before debugging, I changed it according to the blog of techno fat , This is also because of the wall .

Launching lib/main.dart on Android SDK built for x86 in debug mode...
Initializing gradle...
Resolving dependencies...
* Error running Gradle:
ProcessException: Process "/Users/rabbit/develop/android/flutter_app/android/gradlew" exited abnormally:
Project evaluation failed including an error in afterEvaluate {
    }. Run with --stacktrace for details of the afterEvaluate {
    } error.

FAILURE: Build failed with an exception.

* Where:
Build file '/Users/rabbit/develop/android/flutter_app/android/app/build.gradle' line: 25

* What went wrong:
A problem occurred evaluating project ':app'.
> Could not resolve all files for configuration 'classpath'.
   > Could not find lint-gradle-api.jar (com.android.tools.lint:lint-gradle-api:26.1.2).
     Searched in the following locations:
         https://jcenter.bintray.com/com/android/tools/lint/lint-gradle-api/26.1.2/lint-gradle-api-26.1.2.jar

* Try:
Run with --stacktrace option to get the stack trace. Run with --info or --debug option to get more log output. Run with --scan to get full insights.

* Get more help at https://help.gradle.org

BUILD FAILED in 0s
  Command: /Users/rabbit/develop/android/flutter_app/android/gradlew app:properties

Finished with error: Please review your Gradle project setup in the android/ folder.

For this error, you can refer to the blog of technology fat https://jspang.com/detailed?id=41#toc222, Note that two files need to be changed .
Question 4 ： Finally, we need to pay attention gradle There should be a corresponding relationship between the version and its plug-ins , Here is a table

The plug-in version here is 3.5.0,gradle The version is 5.6.2. In accordance with the regulations . The directory of the second file is the project \android\gradle\wrapper, Just check that file , If it does not conform to the above table, it will be changed .