npm 运行 android 不启动 Android 应用程序

Question

问题

我能够清除我的最后一个 after ignoring the errors and following the rest of the steps in the React Native Navigation installation。那些警告消失了。

但是，当我运行 npm run android 时，它构建成功但没有启动应用程序

Configure project :app
...
Configure project :react-native-navigation
...
Task :app:installDebug
...
BUILD SUCCESSFUL in 6s

android 模拟器进入其主屏幕，但应用程序未启动。

我试过的

我已经尝试从 android 工作室 running/building/clean&重建。这导致当我从白色空白屏幕刷新时 Could not connect to development server。

我已按照 here 中的步骤创建资产文件夹并运行使用此代码

react-native bundle --platform android --dev false --entry-file index.android.js --bundle-output android/app/src/main/assets/index.android.bundle --assets-dest android/app/src/main/res

build.gradle

// Top-level build file where you can add configuration options common to all sub-projects/modules.

buildscript {
    ext {
        buildToolsVersion = "28.0.3"
        minSdkVersion = 19
        compileSdkVersion = 28
        targetSdkVersion = 28
        supportLibVersion = "28.0.0"
    }
    repositories {
        google()
        mavenLocal()
        mavenCentral()
        jcenter()
    }
    dependencies {
        classpath 'com.android.tools.build:gradle:3.3.0'
        // NOTE: Do not place your application dependencies here; they belong
        // in the individual module build.gradle files
    }
}

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

app/build.gradle

apply plugin: "com.android.application"

import com.android.build.OutputFile

project.ext.react = [
    entryFile: "index.js"
]

apply from: "../../node_modules/react-native/react.gradle"

/**
 * Set this to true to create two separate APKs instead of one:
 *   - An APK that only works on ARM devices
 *   - An APK that only works on x86 devices
 * The advantage is the size of the APK is reduced by about 4MB.
 * Upload all the APKs to the Play Store and people will download
 * the correct one based on the CPU architecture of their device.
 */
def enableSeparateBuildPerCPUArchitecture = false

/**
 * Run Proguard to shrink the Java bytecode in release builds.
 */
def enableProguardInReleaseBuilds = false

android {
    compileSdkVersion rootProject.ext.compileSdkVersion

    defaultConfig {
        applicationId "com.appname"
        minSdkVersion rootProject.ext.minSdkVersion
        targetSdkVersion rootProject.ext.targetSdkVersion
        missingDimensionStrategy "RNN.reactNativeVersion", "reactNative57_5"
        versionCode 1
        versionName "1.0"
        ndk {
            abiFilters "armeabi-v7a", "x86"
        }
    }
    compileOptions {
        sourceCompatibility JavaVersion.VERSION_1_8
        targetCompatibility JavaVersion.VERSION_1_8
    }
    splits {
        abi {
            reset()
            enable enableSeparateBuildPerCPUArchitecture
            universalApk false  // If true, also generate a universal APK
            include "armeabi-v7a", "x86"
        }
    }
    buildTypes {
        release {
            minifyEnabled enableProguardInReleaseBuilds
            proguardFiles getDefaultProguardFile("proguard-android.txt"), "proguard-rules.pro"
        }
    }
    // applicationVariants are e.g. debug, release
    applicationVariants.all { variant ->
        variant.outputs.each { output ->
            // For each separate APK per architecture, set a unique version code as described here:
            // http://tools.android.com/tech-docs/new-build-system/user-guide/apk-splits
            def versionCodes = ["armeabi-v7a":1, "x86":2]
            def abi = output.getFilter(OutputFile.ABI)
            if (abi != null) {  // null for the universal-debug, universal-release variants
                output.versionCodeOverride =
                        versionCodes.get(abi) * 1048576 + defaultConfig.versionCode
            }
        }
    }
}

configurations.all {
    resolutionStrategy.eachDependency { DependencyResolveDetails details ->
        def requested = details.requested
        if (requested.group == 'com.android.support' && requested.name != 'multidex') {
            details.useVersion "${rootProject.ext.supportLibVersion}"
        }
    }
}

dependencies {
    implementation fileTree(dir: "libs", include: ["*.jar"])
    implementation "com.android.support:design:28.0.0"
    implementation "com.android.support:appcompat-v7:${rootProject.ext.supportLibVersion}"
    implementation "com.facebook.react:react-native:+"  // From node_modules
    implementation project(':react-native-navigation')
}

// Run this once to be able to run the application with BUCK
// puts all compile dependencies into folder libs for BUCK to use
task copyDownloadableDepsToLibs(type: Copy) {
    from configurations.compile
    into 'libs'
}

本机反应：“0.57.8”
react-native-navigation: "^2.7.0"
Android 9.0 API 28

Answer 1

我想你可能必须运行在运行ning npm 运行 android.

之前使用 metro bundler

react-native start --reset-cache

这将启动捆绑器，因此您必须运行

npm run android

在不同的终端 window，但项目目录相同。这个脚本在下面提到！这就是我正在做的方式。自 RN 57.2 以来，metro bundler 出现了一些问题，这一直是一个问题，这是解决方法。与此同时，我已经更新到 RN 57.8 和最新的 RNN，但我仍然运行那样的项目。

我还必须提到，我运行在带有 API 26 和 Android Studio 3.3 的模拟器上使用它，通常如果我运行它作为我上面说了，它会在模拟器中启动应用程序。

构建脚本

"scripts": {
    "build-android": "cd ./android && ./gradlew app:assembleDebug && ./gradlew installDebug && cd ../",
    "android": "npm run build-android && (adb reverse tcp:8081 tcp:8081 || true) && react-native run-android"
}

编辑

请务必遵循 RNN 团队在此 link 下为运行在 Android 上安装您的应用程序给出的说明： The instructions from RNN team for running your app on an Android emulator or device.

编辑 2

根据要求，API 26 是必需的，因为这是您的编译 SDK 版本（当前用于 RNN v2.7.1）以及您的目标 SDK 版本。您可以在与上述 link 相同的 RNN 文档中找到此信息。

npm 运行 android 不启动 Android 应用程序

npm run android does not launch the Android app

macos

android

android-studio

react-native

react-native-navigation

问题

我试过的

build.gradle

app/build.gradle