React Native无法读取index.android.delta问题求助

我之前也碰到过类似的情况，这种回滚依赖后出现的缓存残留问题在React Native项目里特别常见，咱们一步步来搞定它：

1. 彻底清理React Native缓存 #

首先得把Metro打包器的缓存清干净，旧依赖的残留数据很可能是问题根源：

• 依次执行以下命令：

  watchman watch-del-all
  rm -rf node_modules
  npm install
  rm -rf $TMPDIR/react-*
  npm start -- --reset-cache
  

  如果你的项目用Yarn管理依赖，把npm install换成yarn install就行。

2. 清理Android构建缓存 #

Android端的构建缓存也可能拖后腿，进入项目的android目录，执行：

./gradlew clean

Windows用户直接运行gradlew clean就好。

3. 检查依赖残留并手动生成Bundle #

• 先确认package.json和package-lock.json（或yarn.lock）里已经完全删掉了react-native-easy-gridview的相关条目，如果lock文件还有残留，建议删掉lock文件后重新安装依赖。
• 如果前面的步骤没解决问题，可以手动生成Android的bundle文件：

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

  注意：如果你的项目入口文件是index.android.js，记得把命令里的index.js替换掉。

4. 重新启动项目 #

完成上面所有步骤后，关掉所有运行的Metro服务器和模拟器/真机，再重新执行：

react-native run-android

另外看了你提供的build.gradle配置，你的React Native版本是0.47.2，这个版本确实比较老了，虽然当前问题大概率是缓存导致，但如果后续还碰到类似奇怪的问题，也可以考虑逐步升级React Native版本来规避一些历史bug。

你的build.gradle配置参考： #

apply plugin: "com.android.application"
import com.android.build.OutputFile
apply from: "../../node_modules/react-native/react.gradle"

def enableSeparateBuildPerCPUArchitecture = false
def enableProguardInReleaseBuilds = false

android {
    compileSdkVersion 23
    buildToolsVersion "23.0.1"

    defaultConfig {
        applicationId "com.pilbara_weed_management_mobile"
        minSdkVersion 16
        targetSdkVersion 22
        versionCode 8
        versionName "1.0"
        ndk {
            abiFilters "armeabi-v7a", "x86"
        }
    }
    signingConfigs {
        release {
            if (project.hasProperty('MYAPP_RELEASE_STORE_FILE')) {
                storeFile file(MYAPP_RELEASE_STORE_FILE)
                storePassword MYAPP_RELEASE_STORE_PASSWORD
                keyAlias MYAPP_RELEASE_KEY_ALIAS
                keyPassword MYAPP_RELEASE_KEY_PASSWORD
            }
        }
    }
    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"
            signingConfig signingConfigs.release
        }
    }
    // 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
            }
        }
    }
}

dependencies {
    compile project(':react-native-mauron85-background-geolocation')
    compile project(':react-native-background-task')
    compile project(':react-native-keep-awake')
    compile project(':react-native-background-timer')
    compile project(':react-native-image-resizer')
    compile project(':react-native-fcm')
    compile 'com.google.firebase:firebase-core:10.0.1' //this decides your firebase SDK version
    compile project(':react-native-fetch-blob')
    compile fileTree(dir: "libs", include: ["*.jar"])
    compile "com.android.support:appcompat-v7:23.0.1"
    compile ("com.facebook.react:react-native:0.47.2") {
        force = true
    }  // From node_modules
    compile project(':react-native-smart-splashscreen')
    compile project(':react-native-fs')
    compile project(':react-native-file-opener')
    compile project(':react-native-camera')
}

// 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'
}

apply plugin: 'com.google.gms.google-services'

内容的提问来源于stack exchange，提问作者Asnad Atta