网络记事本第二阶段第二天

今天发现了一个报错的地方，在导用包的时候出现了一个引用类出错的现象

找到build.gradle在buildTypes中添加respositories,设置

repositories {
    maven { url "https://maven.google.com" }

}
在后面加一个就行，源码是这样的

apply plugin: 'com.android.application'

android {
    compileSdkVersion 28
    buildToolsVersion "29.0.3"
    defaultConfig {
        applicationId "com.example.notebook"
        minSdkVersion 15
        targetSdkVersion 28
        versionCode 1
        versionName "1.0"
        testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner"
    }
    buildTypes {
        release {
            minifyEnabled false
            proguardFiles getDefaultProguardFile('proguard-android-optimize.txt'), 'proguard-rules.pro'
        }
        repositories {
            maven { url "https://maven.google.com" }

        }
    }
}

dependencies {
    implementation fileTree(dir: 'libs', include: ['*.jar'])
    implementation 'androidx.constraintlayout:constraintlayout:1.1.3'
    testImplementation 'junit:junit:4.13'
    androidTestImplementation 'androidx.test.ext:junit:1.1.1'
    androidTestImplementation 'androidx.test.espresso:espresso-core:3.2.0'
    implementation 'com.google.android.material:material:1.1.0'
    implementation 'com.android.support:appcompat-v7:28.0.0'
    implementation 'com.android.support:appcompat-v7:28.0.0'

}