application cannot be installed on API 21 - android

I just made an application using Android Studio 3.6, I tested using API 29, the application can be installed, but when I ask my friend to test on his device (Android 6.0) the application is not installed, so my application can only be installed on Android 7.0 and above, I want old Android users to be able to use my application. This is build.gradle that I use
apply plugin: 'com.android.application'
apply plugin: 'com.google.gms.google-services'
android {
compileSdkVersion 29
buildToolsVersion "29.0.3"
defaultConfig {
applicationId "com.my.app"
minSdkVersion 21
targetSdkVersion 29
versionCode 10
versionName "1.0"
testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner"
}
buildTypes {
release {
minifyEnabled false
proguardFiles getDefaultProguardFile('proguard-android-optimize.txt'), 'proguard-rules.pro'
}
}
}
dependencies {
implementation fileTree(dir: 'libs', include: ['*.jar'])
implementation 'androidx.appcompat:appcompat:1.1.0'
...
}
I have tried to downgrade the target SDK but it still cannot be installed

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Emulators are not showing in Android Studio

In Android Studio the Emulators are not showing . I tried that disabling ADB Integration. but it is not working for me.
Please give me solution for this problem.

Maybe your project is not compatible (API version) with the target emulator. Check build.gradle file if the targetSDK and minimumSdk version is lower or equal to the sdk version of your Emulator.
Be sure that your compiledSdkVersion matches minSdkVersion and supported by targetSdkVersion. For example:
apply plugin: 'com.android.application'
android {
compileSdkVersion 23
buildToolsVersion "24.0.0"
defaultConfig {
applicationId "zeta.sqlitetest3"
minSdkVersion 16
targetSdkVersion 23
versionCode 1
versionName "1.0"
}
buildTypes {
release {
minifyEnabled false
proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
}
}
}
dependencies {
compile fileTree(dir: 'libs', include: ['*.jar'])
testCompile 'junit:junit:4.12'
compile 'com.android.support:appcompat-v7:23.4.0'
}

My android apk can not run on android 6.0

apply plugin: 'com.android.application'
android {
compileSdkVersion 23
buildToolsVersion "23.0.3"
defaultConfig {
applicationId "com.example.aclientz.aclientzcds"
minSdkVersion 15
targetSdkVersion 23
versionCode 1
versionName "1.0"
}
buildTypes {
debug {
debuggable true
}
release {
minifyEnabled false
proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
}
}
}
dependencies {
compile fileTree(dir: 'libs', include: ['*.jar'])
testCompile 'junit:junit:4.12'
compile 'com.android.support:appcompat-v7:23.4.0'
}
I develop an android application in android studio.Created a signed buindle apk and install my phone (android 5.0) work perfactly but its not working in andoid 5.0+ version. How to avoid this problems, pLease give suggestion

Please Check for runtime permission if you have any permission uses camera or contact which require runtime permission (link)
or for checking purpose please set your targetsdk to 22

Unable to open android project in windows

I'm new to android and developing android application of password manager. I started working in Ubuntu android studio and due to some problem I switched to windows 10 but Unable to import project showing error of app:compileDebugAidl or Aidl is missing. I tried to change version from 23.2.0 to 21.0.2 or 21.0.0 but unable to solve. please suggest
apply plugin: 'com.android.application'
android {
compileSdkVersion 23
buildToolsVersion "23.0.2"
defaultConfig {
applicationId "com.example.devil.password"
minSdkVersion 15
targetSdkVersion 23
versionCode 1
versionName "1.0"
}
buildTypes {
release {
minifyEnabled false
proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
}
}
}
dependencies {
compile fileTree(dir: 'libs', include: ['*.jar'])
testCompile 'junit:junit:4.12'
compile 'com.android.support:appcompat-v7:23.2.0'
}

devices has required level of API . but unable to install App

I am new to the android App developing . My Android phone runs on 4.0.3
i an developing app with miniSDk 4.0(API 14) and TargetSDK 4.4(API 20) .but the App not supported for my device. help me
apply plugin: 'com.android.application'
android {
compileSdkVersion 20
buildToolsVersion "20.0.0"
defaultConfig {
applicationId "com.appspace.arudinoblue"
minSdkVersion 14
targetSdkVersion 20
versionCode 1
versionName "1.0"
}
buildTypes {
release {
minifyEnabled false
proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
}
}
}
dependencies {
compile fileTree(dir: 'libs', include: ['*.jar'])
}

How to change the target version of android in android studio

I import an eclipse project into my android studio. The original project's target is android-14, but my studio's mimimum API version is 21. And I don't want to download the API 14, how should solve my problem?

You only must have downloaded the SDK configured as compileSdkVersion. Your SDK configured as minSdkVersion can be a lower version such as API 14.
In the Android Studio the configuration is realized in build.grade file. For example:
apply plugin: 'com.android.application'
android {
compileSdkVersion 21
buildToolsVersion "22.0.1"
defaultConfig {
minSdkVersion 14
targetSdkVersion 21
versionCode 1
versionName "1.0"
}
buildTypes {
release {
minifyEnabled true
proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
}
}
}
dependencies {
compile project(":lib")
compile 'com.android.support:appcompat-v7:19.0.1'
compile fileTree(dir: 'libs', include: ['*.jar'])
}

you have to add dependencies in build.gradle to use
defaultConfig {
minSdkVersion 14
targetSdkVersion 21
versionCode 1
versionName "1.0"

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