我试图将我的 Android 应用程序连接到 google firebase，但它显示一个错误

Question

I tried to connect my app to google firebase, I followed the procedure with implementation in Gradle as well as JSON file. After that, I tried to run my app and it displayed this error message:

This is my Gradle file:

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

    buildscript {
        repositories {
            google()
            jcenter()

        }
        dependencies {
            classpath 'com.android.tools.build:gradle:3.5.3'
            classpath 'com.google.gms:google-services:4.3.3'
            // NOTE: Do not place your application dependencies here; they belong
            // in the individual module build.gradle files
        }
    }

    allprojects {
        repositories {
            google()
            jcenter()

        }
    }


    task clean(type: Delete) {
        delete rootProject.buildDir

This is my other Gradle module:

apply plugin: 'com.android.application'

android {
    compileSdkVersion 29
    buildToolsVersion "29.0.3"
    defaultConfig {
        applicationId "com.example.ius"
        minSdkVersion 15
        targetSdkVersion 29
        versionCode 1
        versionName "1.0"
        testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner"
    }
    buildTypes {
        release {
            minifyEnabled false
            proguardFiles getDefaultProguardFile('proguard-android-optimize.txt'), 'proguard-rules.pro'
        }
    }
}
apply plugin: 'com.android.application'
apply plugin: 'com.google.gms.google-services'
dependencies {
    implementation fileTree(dir: 'libs', include: ['*.jar'])
    implementation 'androidx.appcompat:appcompat:1.1.0'
    implementation 'androidx.constraintlayout:constraintlayout:1.1.3'
    implementation 'androidx.legacy:legacy-support-v4:1.0.0'
    implementation 'com.google.android.material:material:1.0.0'
    implementation 'androidx.navigation:navigation-fragment:2.0.0'
    implementation 'androidx.navigation:navigation-ui:2.0.0'
    implementation 'androidx.lifecycle:lifecycle-extensions:2.0.0'
    implementation 'com.google.firebase:firebase-analytics:17.2.2'
    implementation 'com.google.firebase:firebase-auth:19.2.0'
    testImplementation 'junit:junit:4.12'
    implementation 'com.android.volley:volley:1.1.0'
    androidTestImplementation 'androidx.test.ext:junit:1.1.1'
    androidTestImplementation 'androidx.test.espresso:espresso-core:3.2.0'
}

If you could help me that would mean the world to me. Thanks in advance :D

Answer 1

Change your minSdkVersion 15 to minSdkVersion 16

As the Docs stated that

Make sure that your app meets the following requirements: Targets API level 16 (Jelly Bean) or later

Answer 2

Some of your library has minSdk 16. So you must change your minSdkVersion to 16 or change library that compatibility with sdk 15.

In your build.gradle(Module leve)

change minSdkVersion 15 to minSdkVersion 16 in defaultConfig

PS. Why you use minSDk is 16, I think use 21 still fine.

Answer 3

在 defaultConfig 中将 minSdkVersion 从 15 更改为 16 可能会起作用......

Answer 4

decrease version library

implementation 'com.google.firebase:firebase-auth:16.0.5'