我原來使用的是minSDKVersion 15，現(xiàn)在因?yàn)樾枰獙?shí)現(xiàn)firebase，所以不得不改成16。使用以前版本的 firebase 不是一種選擇。只需將 build.gradle(Module:app) 中的 minSDKVersion 更改為 16，就會(huì)出現(xiàn)以下錯(cuò)誤：Manifest merger failed : Attribute application@appComponentFactory value=(android.support.v4.app.CoreComponentFactory) from [com.android.support:support-compat:28.0.0] AndroidManifest.xml:22:18-91    is also present at [androidx.core:core:1.0.0] AndroidManifest.xml:22:18-86 value=(androidx.core.app.CoreComponentFactory).    Suggestion: add 'tools:replace="android:appComponentFactory"' to <application> element at AndroidManifest.xml:8:5-40:19 to override.我確實(shí)嘗試了它提供的將 'tools:replace="android:appComponentFactory"' 添加到 AndroidManifest.xml 中的元素的建議，但這會(huì)產(chǎn)生更多錯(cuò)誤。我從這個(gè)改變了我的 build.gradle(Module:app) 文件：apply plugin: 'com.android.application'android {    compileSdkVersion 28    defaultConfig {        applicationId "com.comapny.app"        minSdkVersion 15        targetSdkVersion 28        versionCode 1        versionName "1.0"        testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"    }    buildTypes {        release {            minifyEnabled false            proguardFiles getDefaultProguardFile('proguard-android-optimize.txt'), 'proguard-rules.pro'        }    }}dependencies {    implementation fileTree(dir: 'libs', include: ['*.jar'])    implementation 'com.android.support:appcompat-v7:28.0.0'    implementation 'com.android.support.constraint:constraint-layout:1.1.3'    implementation 'com.android.support:design:28.0.0'    implementation 'com.android.support:support-v4:28.0.0'    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'    implementation 'com.android.volley:volley:1.1.0'}