Android Studio创建的build.gradle中minSDK的实现过高

Question

I've just created my first Android Studio project. I chose min SDK 15 . I'm worried why then compile SDK by default is higher .. Is it secure? Will my app run on devices with API 15 in this configuration? But the real problem occurred when I switched my compileSdkVersion and targetSdkVersion to 24. Errors everywhere and info that implementation 'com.android.support:appcompat-v7:26.1.0' is too high for my target SDK. So why on earth Android Studio put there so high implementation if the min SDK is lower ?

TL;DR: Why implementation is so high? Will it work in this configuration with min API?? Why Android Studio works like this?

build.gradle:

apply plugin: 'com.android.application'

android {
    compileSdkVersion 26
    defaultConfig {
        applicationId "com.q_back.audiocrator"
        minSdkVersion 15
        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'
    testImplementation 'junit:junit:4.12'
    androidTestImplementation 'com.android.support.test:runner:1.0.1'
    androidTestImplementation 'com.android.support.test.espresso:espresso-core:3.0.1'
}

Answer 1

Its ok, and in fact normal for the compileSDK to be bigger than the minimum. The library version for the support version should match your compileSDK. Either upgrade to 26, or downgrade the support library.

Answer 2

All android devices with SDK versions equal and above the minSDKVersion will be able to run the application. it is best to use the same version of SDK tools as the version on your compileSDK, it won't really affect the devices that can run the applications. the major factor is that some Google APIs wont work on lower SDK levels.