Question

要安装的信息来源： - https://facebook.github.io/react-native/docs/getting-started.html

另外，我添加了环境变量。

然后使用这些完美运行的命令：

npm开始 npm运行android

然后当我运行此命令时：

react-native run-android

它显示了这个error： Image showing error stack

D:\Projects\React-Native\AwesomeProject>react-native run-android
    Scanning 768 folders for symlinks in D:\Projects\React-Native\AwesomeProject\nod
    e_modules (31ms)
    Starting JS server...
    Building and installing the app on the device (cd android && gradlew.bat install
    Debug)...

    FAILURE: Build failed with an exception.

    * Where:
    Build file 'D:\Projects\React-Native\AwesomeProject\android\app\build.gradle' li
    ne: 1

    * What went wrong:
    A problem occurred evaluating project ':app'.
    > java.lang.UnsupportedClassVersionError: com/android/build/gradle/AppPlugin : U
    nsupported major.minor version 52.0

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

    BUILD FAILED

    Total time: 3.124 secs
    Could not install the app on the device, read the error above for details.
    Make sure you have an Android emulator running or a device connected and have
    set up your Android development environment:
    https://facebook.github.io/react-native/docs/android-setup.html
    events.js:182
          throw er; // Unhandled 'error' event
          ^

    Error: spawn cmd.exe ENOENT
        at _errnoException (util.js:1019:11)
        at Process.ChildProcess._handle.onexit (internal/child_process.js:192:19)
        at onErrorNT (internal/child_process.js:374:16)
        at _combinedTickCallback (internal/process/next_tick.js:138:11)
        at process._tickCallback (internal/process/next_tick.js:180:9)

构建gradle

        buildscript {
        repositories {
            jcenter()
        }
        dependencies {
            classpath 'com.android.tools.build:gradle:2.2.3'

            // NOTE: Do not place your application dependencies here; they belong
            // in the individual module build.gradle files
        }
    }

    allprojects {
        repositories {
            mavenLocal()
            jcenter()
            maven {
                // All of React Native (JS, Obj-C sources, Android binaries) is installed from npm
                url "$rootDir/../node_modules/react-native/android"
            }
        }
    }

Answer 1

显然你的build.gradle文件中有错误。

不看文件，我想它可能与最小的Android版本或类似的东西有关。

此gradle文件包含构建Android应用程序的所有信息，因此如果它包含错误，则会出现“FAILURE：Build failed with anception。”

Answer 2

我通过添加适当的环境变量路径解决了这个问题。请参阅附件截图。

C：\ Windows \ System32下* WindowsPowerShell \ V1.0 * ;
C：\ Users \用户gyrix **应用程序数据\漫游\ NPM **;
C：\用户\ gyrix **应用程序数据\本地\纱\ BIN **;
d：\ Android的\ sdk1 **平台工具**;
E：\ Android的SDK **构建工具\ 25.0.2 **;
d：\的Android ** ** sdk1;
d：\ Android的\ sdk1 ** **工具;
C：\ Program Files ** Java \ jdk1.8.0_144 \ bin **;

注意：请以粗体指定文件夹的路径，它可能因系统而异。 enter code here

使本地运行反应的问题

构建gradle

2 个答案: