Cannot add task 'wrapper' as a task with that name already exists

问题

when installing 'react-native init AwesomeProject' I am then met with the above error when running 'react-native run-android'

Could not determine java version from '11.0.1'.

a quick google suggests I need to update the distributionUrl in the Gradle-wrapper. Having done this I am faced with a new error

Cannot add task 'wrapper' as a task with that name already exists.

it suggests the issue is in the file:

/AwesomeProject/android/build.gradle' line: 36

which looks like this

task wrapper(type: Wrapper) {
    gradleVersion = '4.4'
    distributionUrl = distributionUrl.replace("bin", "all")
}

I've been back and forth trying to figure out what this does. It seems odd that something wouldn't work straight out of the box. is anybody facing a similar issue?

回答1:

You can also update

task wrapper(type: Wrapper) {
    gradleVersion = '4.4'    
    distributionUrl = distributionUrl.replace("bin", "all")
}

wrapper {
    gradleVersion = '4.4'
    distributionUrl = distributionUrl.replace("bin", "all")
}

Overriding built-in tasks deprecated in 4.8 now produces an error.

Attempting to replace a built-in task will produce an error similar to the following:

Cannot add task 'wrapper' as a task with that name already exists.

see the last paragraph of Tasks & properties: https://docs.gradle.org/5.2.1/userguide/upgrading_version_4.html

and Customizing the Wrapper task: https://docs.gradle.org/5.2.1/userguide/gradle_wrapper.html#customizing_wrapper

回答2:

which version of gradle do you use in your environment?

If you use gradle version 5.x you have to modify 「task wrapper」 as below.

task wrapper(type: Wrapper) {
    gradleVersion = '4.4'
    distributionUrl = distributionUrl.replace("bin", "all")
}

↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓

wrapper {
    gradleVersion = '4.4'
    distributionUrl = distributionUrl.replace("bin", "all")
}

回答3:

As mentioned in the comments follow - https://stackoverflow.com/a/46867575/4982729:

Open and edit the file app-folder/android/gradle/wrapper/gradle-wrapper.properties; update the line
```
distributionUrl=https\://services.gradle.org/distributions/gradle-5.0-all.zip
```

In file AwesomeProject/android/build.gradle try commenting out

task wrapper(type: Wrapper) {
    gradleVersion = '4.4'
    distributionUrl = distributionUrl.replace("bin", "all")
}

回答4:

if "gradle-wrapper.properties" file already have these codes

distributionBase=GRADLE_USER_HOME
distributionPath=wrapper/dists
zipStoreBase=GRADLE_USER_HOME
zipStorePath=wrapper/dists
distributionUrl=https\://services.gradle.org/distributions/gradle-5.4.1-all.zip

then you can remove

task wrapper(type: Wrapper) {
    gradleVersion = '4.4'
    distributionUrl = distributionUrl.replace("bin", "all")
}

from build.gradle

回答5:

There's a high chance you have a "task" to run in your build.gradle file, go and remove the line related to wrapper (including its bracket and so on). Then, if you are using IntelliJ, it will automatically bring the new one to your working directory.

回答6:

I have the same issue. the problem in my code was a double declaration on another Gradle file in build.gradle

build.gradle

apply from: otherFile.gradle
... build. gradle code...
apply from: otherFile.gradle //Again

来源：https://stackoverflow.com/questions/53709282/cannot-add-task-wrapper-as-a-task-with-that-name-already-exists

标签

android

reactjs

react-native

wrapper

expo