react-native run-android 运行出错 No connected devices!
发布时间：2020-12-15 08:16:44 所属栏目：百科 来源：网络整理
导读：问题 D:rnworkspaceHelloreact-native run-android JS server already running. Building and installing the app on the device (cd android gradlew.bat install Debug)... :app:preBuild UP-TO-DATE :app:preDebugBuild UP-TO-DATE :app:checkDebugMani
问题D:rnworkspaceHello>react-native run-android JS server already running.Building and installing the app on the device (cd android && gradlew.bat install Debug)... :app:preBuild UP-TO-DATE :app:preDebugBuild UP-TO-DATE :app:checkDebugManifest :app:preReleaseBuild UP-TO-DATE :app:prepareComAndroidSupportAppcompatV72301Library UP-TO-DATE :app:prepareComAndroidSupportRecyclerviewV72301Library UP-TO-DATE :app:prepareComAndroidSupportSupportV42321Library UP-TO-DATE :app:prepareComFacebookFrescoDrawee0110Library UP-TO-DATE :app:prepareComFacebookFrescoFbcore0110Library UP-TO-DATE :app:prepareComFacebookFrescoFresco0110Library UP-TO-DATE :app:prepareComFacebookFrescoImagepipeline0110Library UP-TO-DATE :app:prepareComFacebookFrescoImagepipelineBase0110Library UP-TO-DATE :app:prepareComFacebookFrescoImagepipelineOkhttp30110Library UP-TO-DATE :app:prepareComFacebookReactReactNative0392Library UP-TO-DATE :app:prepareComFacebookSoloaderSoloader010Library UP-TO-DATE :app:prepareOrgWebkitAndroidJscR174650Library UP-TO-DATE :app:prepareDebugDependencies :app:compileDebugAidl UP-TO-DATE :app:compileDebugRenderscript UP-TO-DATE :app:generateDebugBuildConfig UP-TO-DATE :app:generateDebugAssets UP-TO-DATE :app:mergeDebugAssets UP-TO-DATE :app:generateDebugResValues UP-TO-DATE :app:generateDebugResources UP-TO-DATE :app:mergeDebugResources UP-TO-DATE :app:bundleDebugJsAndAssets SKIPPED :app:processDebugManifest UP-TO-DATE :app:processDebugResources UP-TO-DATE :app:generateDebugSources UP-TO-DATE :app:processDebugJavaRes UP-TO-DATE :app:compileDebugJavaWithJavac UP-TO-DATE :app:compileDebugNdk UP-TO-DATE :app:compileDebugSources UP-TO-DATE :app:preDexDebug UP-TO-DATE :app:dexDebug :app:validateDebugSigning :app:packageDebug :app:zipalignDebug :app:assembleDebug :app:installDebug FAILED FAILURE: Build failed with an exception. * What went wrong: Execution failed for task ':app:installDebug'. > com.android.builder.testing.api.DeviceException: No connected devices! * 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: 23.398 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 (node:6824) UnhandledPromiseRejectionWarning: Unhandled promise rejection (rejec tion id: 2): TypeError: Cannot read property 'message' of undefined
问题分析
1.用
gradlew compileDebug --stacktrace 编译调试命令进行调试，显示如下：
D:rnworkspaceHelloandroid>gradlew compileDebug --stacktrace
FAILURE: Build failed with an exception. * What went wrong: Task 'compileDebug' is ambiguous in root project 'Hello'. Candidates are: 'compi leDebugAidl','compileDebugAndroidTestAidl','compileDebugAndroidTestJavaWithJav ac','compileDebugAndroidTestNdk','compileDebugAndroidTestRenderscript','compi leDebugAndroidTestSources','compileDebugJavaWithJavac','compileDebugNdk','com pileDebugRenderscript','compileDebugSources','compileDebugUnitTestJavaWithJava c','compileDebugUnitTestSources'. * Try: Run gradlew tasks to get a list of available tasks. Run with --info or --debug o ption to get more log output. * Exception is: org.gradle.execution.TaskSelectionException: Task 'compileDebug' is ambiguous in root project 'Hello'. Candidates are: 'compileDebugAidl','compileDebugAndroidT estAidl','compileDebugAndroidTestJavaWithJavac', 'compileDebugAndroidTestRenderscript','compileDebugAndroidTestSources','compil eDebugJavaWithJavac','compileDebugRenderscript','compileDeb ugSources','compileDebugUnitTestJavaWithJavac','compileDebugUnitTestSources'. at org.gradle.execution.TaskSelector.getSelection(TaskSelector.java:100) 解决
1.启动AVD
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