zxing 扫码第三方SDK版本不兼容问题

在AndroidStudio环境下，或许会遇到下面的问题:

Error:Execution failed for task ':app:preDebugAndroidTestBuild'.
> Conflict with dependency 'com.android.support:support-annotations' in project ':app'. Resolved versions for app (26.1.0) and test app (27.1.1) differ. See https://d.android.com/r/tools/test-apk-dependency-conflicts.html for details.

表示测试版本与测试版本不一致，这种问题网上给出的答案是: Rebuilde Project。

可是每次创建Activity和打开AndroidStudio都要Rebuilde Project太麻烦了。

在使用 zxing 扫码插件的时候又遇到了这么个问题 :

Error:Execution failed for task ':app:processDebugManifest'.
> Manifest merger failed : uses-sdk:minSdkVersion 15 cannot be smaller than version 16 declared in library [com.github.yuzhiqiang1993:zxing:2.1.8] C:\Users\asd25\.gradle\caches\transforms-1\files-1.1\zxing-2.1.8.aar\a404ff49b2cb172765d68a2248efaa73\AndroidManifest.xml as the library might be using APIs not available in 15
  	Suggestion: use a compatible library with a minSdk of at most 15,
  		or increase this project's minSdk version to at least 16,
  		or use tools:overrideLibrary="com.yzq.zxinglibrary" to force usage (may lead to runtime failures)

说是MinSdk版本过低，于是修改了下 ：

apply plugin: 'com.android.application'

android {
    compileSdkVersion 26
    defaultConfig {
        applicationId "he3.sd"
        minSdkVersion 16
        targetSdkVersion 26
        versionCode 1
        versionName "1.0"
        testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
    }
    buildTypes {
        release {
            minifyEnabled false
            proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
        }
    }
}

dependencies {
    implementation fileTree(dir: 'libs', include: ['*.jar'])
    implementation 'com.android.support:appcompat-v7:26.1.0'
    implementation 'com.android.support.constraint:constraint-layout:1.1.1'
    testImplementation 'junit:junit:4.12'
    androidTestImplementation 'com.android.support.test:runner:1.0.2'
    androidTestImplementation 'com.android.support.test.espresso:espresso-core:3.0.2'
    compile 'com.github.huangyanbin:SmartTable:2.2.0'
    implementation 'com.android.support:appcompat-v7:26.1.0'
    implementation 'com.android.support:design:26.1.0'
    implementation 'com.android.support:support-vector-drawable:26.1.0'
    /*添加依赖*/
    implementation 'com.github.yuzhiqiang1993:zxing:2.1.8'
}

问题都解决了。