样本输出

Question

我注意到在构建android构建时，react-native和gradle具有两个不同的输出。

本机构建似乎合并了react-native-config等插件的一些预构建工作
如果没有要安装的设备（本机为仿真器），react-native将在构建时失败
不同的BUILD SUCCESSFUL输出，特别是error type 3
安装-仅react-native

问题

除了安装部分（4）之外，这两个命令的构建部分为何不同？

样本输出

react-native run-android

$ react-native run-android
Scanning folders for symlinks in /Users/Jackson/Sites/fnmultiapptest/node_modules (10ms)
JS server already running.
Building and installing the app on the device (cd android && ./gradlew installDebug)...

> Configure project :app 
Reading env from: .env
WARNING: Configuration 'compile' is obsolete and has been replaced with 'implementation' and 'api'.
It will be removed at the end of 2018. For more information see: http://d.android.com/r/tools/update-dependency-configurations.html
Observed package id 'build-tools;20.0.0' in inconsistent location '/Users/Jackson/.android/build-tools/android-4.4W' (Expected '/Users/Jackson/.android/build-tools/20.0.0')

> Configure project :react-native-config 
WARNING: Configuration 'compile' is obsolete and has been replaced with 'implementation' and 'api'.
It will be removed at the end of 2018. For more information see: http://d.android.com/r/tools/update-dependency-configurations.html

> Task :react-native-config:installDebugAndroidTest 
11:40:14 V/ddms: execute: running am get-config
11:40:14 V/ddms: execute 'am get-config' on 'emulator-5554' : EOF hit. Read: -1
11:40:14 V/ddms: execute: returning
Installing APK 'react-native-config-debug-androidTest.apk' on 'Nexus_5X_API_26(AVD) - 8.0.0' for react-native-config:debugAndroidTest
11:40:14 D/react-native-config-debug-androidTest.apk: Uploading react-native-config-debug-androidTest.apk onto device 'emulator-5554'
11:40:14 D/Device: Uploading file onto device 'emulator-5554'
11:40:14 D/ddms: Reading file permision of /Users/Jackson/Sites/fnmultiapptest/node_modules/react-native-config/android/build/outputs/apk/androidTest/debug/react-native-config-debug-androidTest.apk as: rw-r--r--
11:40:14 V/ddms: execute: running pm install -r -t "/data/local/tmp/react-native-config-debug-androidTest.apk"
11:40:15 V/ddms: execute 'pm install -r -t "/data/local/tmp/react-native-config-debug-androidTest.apk"' on 'emulator-5554' : EOF hit. Read: -1
11:40:15 V/ddms: execute: returning
11:40:15 V/ddms: execute: running rm "/data/local/tmp/react-native-config-debug-androidTest.apk"
11:40:15 V/ddms: execute 'rm "/data/local/tmp/react-native-config-debug-androidTest.apk"' on 'emulator-5554' : EOF hit. Read: -1
11:40:15 V/ddms: execute: returning
Installed on 1 device.


BUILD SUCCESSFUL in 2s
38 actionable tasks: 1 executed, 37 up-to-date
Running /Users/Jackson/.android/platform-tools/adb -s emulator-5554 reverse tcp:8081 tcp:8081
Starting the app on emulator-5554 (/Users/Jackson/.android/platform-tools/adb -s emulator-5554 shell am start -n com.workingproject/com.workingproject.MainActivity)...
Starting: Intent { cmp=com.workingproject/.MainActivity }
Error type 3
Error: Activity class {com.workingproject/com.workingproject.MainActivity} does not exist.

./ gradlew assembleDebug

$ ./gradlew assembleDebug

> Configure project :app 
Reading env from: .env
WARNING: Configuration 'compile' is obsolete and has been replaced with 'implementation' and 'api'.
It will be removed at the end of 2018. For more information see: http://d.android.com/r/tools/update-dependency-configurations.html

> Configure project :react-native-config 
WARNING: Configuration 'compile' is obsolete and has been replaced with 'implementation' and 'api'.
It will be removed at the end of 2018. For more information see: http://d.android.com/r/tools/update-dependency-configurations.html


BUILD SUCCESSFUL in 0s
50 actionable tasks: 50 up-to-date

Answer 1

react-native run-android包含命令./gradlew installDebug

./gradlew installDebug用于需要将apk推送到设备时，而./gradlew assembleDebug仅用于构建apk。

如果必须要有一个观点，可以说./gradlew assembleDebug是./gradlew installDebug执行的过程的子集

从本质上讲，如果我必须列出，react-native run-android执行的过程包括-

启动都会打包程序捆绑器，它将监听您所有的js更改
使用./gradlew installDebug
检查可用设备，如果不是，则失败。
如果成功，它将在设备上安装apk，您可以从显示给我们的日志中读取该apk。
最后，它执行reverse tcp:8081 tcp:8081，它将您的Metro Bundle捆绑到应用仿真器/设备

然后./gradlew assembleDebug会构建apk。没有了

希望它会有所帮助：）

PS：如果仔细检查，react-native run-android的构建部分是成功的，因此可以看到BUILD SUCCESSFUL的输出，但是由于其他进程失败，因此它整体上会失败。

Answer 2

根据我的说法，您正在比较两种不同的事物。

react-native run-android：

它执行cd android && ./gradlew installDebug（在打印的日志中可以看到），它专门用于安装已经构建并签名的apk，或者构建apk并立即将其安装在正在运行的模拟器或连接的设备上。
/> 由于安装不成功，它会引发错误。
./gradlew assembleDebug：

另一方面，./gradlew assembleDebug仅用于构建应用程序。（这意味着您可以使用此命令构建调试APK。）成功创建调试apk时，它会显示消息“ BUILD SUCCESSFUL”（构建成功）

REF: Build a debug APK

react-native运行android vs./gradlew assembleDebug

样本输出

2 个答案: