问题
D:\rnworkspace\Hello>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:\rnworkspace\Hello\android>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)
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
原文链接：https://www.f2er.com/react/305258.html