Android - API 级别 21 中的日期 [英] Android - Date in API Level 21

问题描述

您好，我对 Android 还是有点陌生​​，

Hello I'm still kinda new to Android,

目前我对本地日期(或我尝试过的任何其他日期格式)有一个大问题

at the moment I have a big problem with Local Date(or any other Date Format I tried)

LocalDate currentDate = LocalDate().now();

此行产生以下错误:

Call requires API Level 26 (current min is 21)

我完全理解这意味着什么，但我无法更改项目的 API 级别(因为我与我的老师签订了合同，我和一个合作伙伴将以这种方式完成我们的学校项目计划好了.)

I perfectly understands what this means, but I can't change the API Level of the project (due to the fact that I singed a contract with my teacher that me and a partner will make our school project in excact that way we planned it.)

如何在 API 级别 21 中使用任何类型的日期?

摇篮:

apply plugin: 'com.android.application'
apply plugin: 'com.google.gms.google-services'

android {
    compileSdkVersion 29
    buildToolsVersion "29.0.2"
    defaultConfig {
        applicationId "com.example.fragment"
        minSdkVersion 21
        targetSdkVersion 29
        versionCode 1
        versionName "0.5"
        testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner"
    }
    buildTypes {
        release {
            minifyEnabled false
            proguardFiles getDefaultProguardFile('proguard-android-optimize.txt'), 'proguard-rules.pro'

        }
    }
    android {
        compileOptions {
            coreLibraryDesugaringEnabled true
        }
    }
}


dependencies {
    implementation fileTree(dir: 'libs', include: ['*.jar'])
    implementation 'androidx.appcompat:appcompat:1.1.0'
    implementation 'androidx.appcompat:appcompat:1.1.0'
    implementation 'androidx.constraintlayout:constraintlayout:1.1.3'
    implementation 'com.google.firebase:firebase-database:19.2.1'
    testImplementation 'junit:junit:4.12'
    androidTestImplementation 'androidx.test:runner:1.2.0'
    androidTestImplementation 'androidx.test.espresso:espresso-core:3.2.0'
    implementation 'com.google.android.material:material:1.1.0'
    implementation 'com.firebase:firebase-client-android:2.5.2'
    implementation 'com.google.android.gms:play-services-auth:17.0.0'
    implementation 'me.dm7.barcodescanner:zxing:1.9'
    //noinspection GradleCompatible
    implementation 'com.android.support:appcompat-v7:22.0.0'
    implementation 'com.google.code.gson:gson:2.8.6'

}

推荐答案

将此添加到您的 build.gradle 文件中:

Add this to your build.gradle file:

android {
  compileOptions {
    coreLibraryDesugaringEnabled true
  }
}

较新版本的 Android Gradle 插件(从 4.0 开始)能够使用脱糖将新 API 向后移植到旧版本的 Android.您可以在此处阅读更多相关信息:https://jakewharton.com/d8-library-desugaring/

Newer versions of the Android Gradle plugin (starting with 4.0) are able to use desugaring to backport new APIs to older versions of Android. You can read more about it here: https://jakewharton.com/d8-library-desugaring/

请注意，您必须使用 Android Studio 的 Beta 版才能访问这些功能:https://developer.android.com/studio/preview

Note that you'll have to use the Beta release of Android Studio to access these features: https://developer.android.com/studio/preview

这篇关于Android - API 级别 21 中的日期的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！