要在生成的发布模式APK中检查异常日志，请遵循步骤1-3。*（如果已在设备上安装签名的发布模式APK，则可以跳过步骤1。
1.确保adb设备命令列出了您的设备，然后通过运行下面的命令从文件夹与apk在设备/模拟器上安装应用程序。
adb -d install -r app-name.apk例如：adb -d install -r learnapp.apk

• 如果要在模拟器上安装，请将-d更改为-e。*

1. run adb logcat | FINDSTR "Exception"这将记录cmd上的所有异常消息。
   1.现在启动应用程序，异常详细信息将显示在cmd上。
   异常可以是非常微小的问题，例如我有console.clear（）在我的应用程序屏幕的componentDidMount（）钩子和console.clear是未定义的异常是导致崩溃后，导航到该屏幕.运行步骤1-3后，我发现了异常，从代码中删除该行，再次生成apk和应用程序工作得很好之后！

我现在遇到了完全相同的react 0.59.8（甚至60+）错误。也许我可以解释一下，因为它真的让我很恼火，因为我不能开发我的应用程序，而是专注于修复与框架相关的错误...所以作为一个解释：该项目已成功构建。当CD到Android子文件夹，我执行

./gradlew assembleDebug --stacktrace (or similar)

它说构建成功。如果我运行react-native run-android，它也会成功构建并尝试将文件上传到设备。然后崩溃，没有任何错误。我只是回到了我执行react-native run-android的shell中。
有时候，在执行npm start并在设备上点击reload后，导致JavaScript被构建/转化（或者发生了什么。我不知道），它会被修复。
有人有同样的问题吗？
有人知道为什么会这样吗？
更新：adblogcat *：当尝试连接到使用npm start运行的metro bundler时，E抛出此错误（当运行npm start时它不工作时）
unknown:ReactNative: ... 21 more 09-17 10:34:38.851 29275 29275 E unknown:ReactNative: Caused by: android.system.ErrnoException: isConnected failed: ECONNREFUSED (Connection refused)
我的包裹。

{
...
  "scripts": {
    "start": "node node_modules/react-native/local-cli/cli.js start",
    "test": "jest"
  },
  "dependencies": {
    "lodash": "^4.17.11",
    "moment": "^2.24.0",
    "react": "16.8.3",
    "react-native": "0.59.8",
    "react-native-firebase": "^5.3.1",
    "react-native-gesture-handler": "^1.2.1",
    "react-native-image-picker": "^0.28.1",
    "react-native-table-component": "^1.2.0",
    "react-native-vector-icons": "^6.4.2",
    "react-navigation": "^3.11.0",
    "uuid": "^3.3.2"
  },
  "devDependencies": {
    "@babel/core": "^7.4.4",
    "@babel/runtime": "^7.4.4",
    "babel-jest": "^24.8.0",
    "jest": "^24.8.0",
    "metro-react-native-babel-preset": "^0.54.1",
    "react-test-renderer": "16.8.3"
  },
  "jest": {
    "preset": "react-native"
  }
}

my MainApplication.java

...

import android.app.Application;

import com.facebook.react.ReactApplication;
import io.invertase.firebase.RNFirebasePackage;
import io.invertase.firebase.auth.RNFirebaseAuthPackage;
import io.invertase.firebase.storage.RNFirebaseStoragePackage;
import io.invertase.firebase.database.RNFirebaseDatabasePackage;
import com.swmansion.gesturehandler.react.RNGestureHandlerPackage;
import com.imagepicker.ImagePickerPackage;
import com.facebook.react.ReactNativeHost;
import com.facebook.react.ReactPackage;
import com.facebook.react.shell.MainReactPackage;
import com.facebook.soloader.SoLoader;

import java.util.Arrays;
import java.util.List;

public class MainApplication extends Application implements ReactApplication {

  private final ReactNativeHost mReactNativeHost = new ReactNativeHost(this) {
    @Override
    public boolean getUseDeveloperSupport() {
      return BuildConfig.DEBUG;
    }

    @Override
    protected List<ReactPackage> getPackages() {
      return Arrays.<ReactPackage>asList(new MainReactPackage(), new RNFirebasePackage(), new RNFirebaseAuthPackage(),
          new RNGestureHandlerPackage(), new ImagePickerPackage(), new RNFirebaseStoragePackage(),
          new RNFirebaseDatabasePackage());
    }

    @Override
    protected String getJSMainModuleName() {
      return "index";
    }
  };

  @Override
  public ReactNativeHost getReactNativeHost() {
    return mReactNativeHost;
  }

  @Override
  public void onCreate() {
    super.onCreate();
    SoLoader.init(this, /* native exopackage */ false);
  }
}

安卓系统/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 = 16
        compileSdkVersion = 28
        targetSdkVersion = 28
        supportLibVersion = "28.0.0"
    }
    repositories {
        google()
        jcenter()
    }
    dependencies {
        classpath 'com.android.tools.build:gradle:3.3.2'
        classpath 'com.google.gms:google-services:4.2.0'
        
        // NOTE: Do not place your application dependencies here; they belong
        // in the individual module build.gradle files
    }
}

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

安卓系统/app/build. gradle

apply plugin: "com.android.application"

import com.android.build.OutputFile

/**
 * The react.gradle file registers a task for each build variant (e.g. bundleDebugJsAndAssets
 * and bundleReleaseJsAndAssets).
 * These basically call `react-native bundle` with the correct arguments during the Android build
 * cycle. By default, bundleDebugJsAndAssets is skipped, as in debug/dev mode we prefer to load the
 * bundle directly from the development server. Below you can see all the possible configurations
 * and their defaults. If you decide to add a configuration block, make sure to add it before the
 * `apply from: "../../node_modules/react-native/react.gradle"` line.
 *
 * project.ext.react = [
 *   // the name of the generated asset file containing your JS bundle
 *   bundleAssetName: "index.android.bundle",
 *
 *   // the entry file for bundle generation
 *   entryFile: "index.android.js",
 *
 *   // whether to bundle JS and assets in debug mode
 *   bundleInDebug: false,
 *
 *   // whether to bundle JS and assets in release mode
 *   bundleInRelease: true,
 *
 *   // whether to bundle JS and assets in another build variant (if configured).
 *   // See http://tools.android.com/tech-docs/new-build-system/user-guide#TOC-Build-Variants
 *   // The configuration property can be in the following formats
 *   //         'bundleIn${productFlavor}${buildType}'
 *   //         'bundleIn${buildType}'
 *   // bundleInFreeDebug: true,
 *   // bundleInPaidRelease: true,
 *   // bundleInBeta: true,
 *
 *   // whether to disable dev mode in custom build variants (by default only disabled in release)
 *   // for example: to disable dev mode in the staging build type (if configured)
 *   devDisabledInStaging: true,
 *   // The configuration property can be in the following formats
 *   //         'devDisabledIn${productFlavor}${buildType}'
 *   //         'devDisabledIn${buildType}'
 *
 *   // the root of your project, i.e. where "package.json" lives
 *   root: "../../",
 *
 *   // where to put the JS bundle asset in debug mode
 *   jsBundleDirDebug: "$buildDir/intermediates/assets/debug",
 *
 *   // where to put the JS bundle asset in release mode
 *   jsBundleDirRelease: "$buildDir/intermediates/assets/release",
 *
 *   // where to put drawable resources / React Native assets, e.g. the ones you use via
 *   // require('./image.png')), in debug mode
 *   resourcesDirDebug: "$buildDir/intermediates/res/merged/debug",
 *
 *   // where to put drawable resources / React Native assets, e.g. the ones you use via
 *   // require('./image.png')), in release mode
 *   resourcesDirRelease: "$buildDir/intermediates/res/merged/release",
 *
 *   // by default the gradle tasks are skipped if none of the JS files or assets change; this means
 *   // that we don't look at files in android/ or ios/ to determine whether the tasks are up to
 *   // date; if you have any other folders that you want to ignore for performance reasons (gradle
 *   // indexes the entire tree), add them here. Alternatively, if you have JS files in android/
 *   // for example, you might want to remove it from here.
 *   inputExcludes: ["android/**", "ios/**"],
 *
 *   // override which node gets called and with what additional arguments
 *   nodeExecutableAndArgs: ["node"],
 *
 *   // supply additional arguments to the packager
 *   extraPackagerArgs: []
 * ]
 */


project.ext.vectoricons = [
    iconFontNames: [ 'MaterialIcons.ttf', 'EvilIcons.ttf', 'FontAwesome.ttf' ] // Name of the font files you want to copy
]
apply from: "../../node_modules/react-native-vector-icons/fonts.gradle"

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

    compileOptions {
        sourceCompatibility JavaVersion.VERSION_1_8
        targetCompatibility JavaVersion.VERSION_1_8
    }

    defaultConfig {
        applicationId "com.bonscanner"
        minSdkVersion rootProject.ext.minSdkVersion
        targetSdkVersion rootProject.ext.targetSdkVersion
        versionCode 1
        versionName "1.0"
    }
    splits {
        abi {
            reset()
            enable enableSeparateBuildPerCPUArchitecture
            universalApk false  // If true, also generate a universal APK
            include "armeabi-v7a", "x86", "arm64-v8a", "x86_64"
        }
    }
    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, "arm64-v8a": 3, "x86_64": 4]
            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 {
    implementation project(':react-native-firebase')
    implementation project(':react-native-gesture-handler')
    implementation project(':react-native-image-picker')
    implementation fileTree(dir: "libs", include: ["*.jar"])
    implementation "com.android.support:appcompat-v7:${rootProject.ext.supportLibVersion}"
    implementation "com.facebook.react:react-native:+"  // From node_modules
    implementation "com.google.firebase:firebase-core:16.0.9"
    implementation "com.google.firebase:firebase-auth:17.0.0"
    implementation "com.google.firebase:firebase-storage:17.0.0"
    implementation 'com.google.firebase:firebase-database:17.0.0'
    }

// 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'

gradle.properties contains:
android.useAndroidX=true android.enableJetifier=true

这可能是线性梯度的原因，我面临着同样的问题。
https://github.com/react-native-linear-gradient/react-native-linear-gradient/issues/455