Downgrade Android SDK from 29 to 21 - android

I need to downgrade my SDK to 21 in order to test some deprecated features that are no longer working properly on SDK 29. But when I lower SDK and sync project it gives an error when compiling app.
The error is C:\Users\user\.gradle\caches\transforms-2\files-2.1\93bc303e0edf41378a70a682ebb74605\appcompat-1.1.0\res\values-v26\values-v26.xml:5:5-8:13: AAPT: error: resource android:attr/colorError not found.
Here are my build.gradle settings
apply plugin: 'com.android.application'
apply plugin: 'kotlin-android'
apply plugin: 'kotlin-android-extensions'
android {
compileSdkVersion 21
buildToolsVersion '28.0.3'
defaultConfig {
applicationId "com.example.oldstuff"
minSdkVersion 15
targetSdkVersion 21
versionCode 1
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"org.jetbrains.kotlin:kotlin-stdlib-jdk7:$kotlin_version"
implementation 'androidx.appcompat:appcompat:1.1.0'
implementation 'androidx.core:core-ktx:1.2.0'
implementation 'androidx.constraintlayout:constraintlayout:1.1.3'
testImplementation 'junit:junit:4.12'
androidTestImplementation 'androidx.test.ext:junit:1.1.1'
androidTestImplementation 'androidx.test.espresso:espresso-core:3.2.0'
}
What should be added/removed?

This issue occurs when you use compileSdkVersion and buildToolsVersion less than 26
Your compileSdkVersion is 21, but it can be possible that third party libraries use resources that were only added in API 26 or later. Either update your build.gradle file to use the newest compileSdkVersion or try to downgrade third party libraries.

Related

Is it possible to target Android 28 (eg`targetSdkVersion 28`) and use both appcompat-v7 and Firebase?

Has anyone managed to target Android 28 (eg set targetSdkVersion 28) and use Firebase? My build.gradle is as below:
apply plugin: 'com.android.application'
android {
compileSdkVersion 28
defaultConfig {
applicationId "com.google.firebase.example.fireeats"
minSdkVersion 28
targetSdkVersion 28
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-v7:28.0.0-rc02'
implementation 'com.google.firebase:firebase-core:16.0.3'
testImplementation 'junit:junit:4.12'
androidTestImplementation 'com.android.support.test:runner:1.0.2'
androidTestImplementation 'com.android.support.test.espresso:espresso-core:3.0.2'
}
apply plugin: 'com.google.gms.google-services'
Android Studio warns of mixed versions: Found versions 28.0.0-rc02, 26.1.0. Examples include com.android.support:animated-vector-drawable:28.0.0-rc02 and com.android.support:support-media-compat:26.1.0
Is Firebase 16.0.3 incompatible with the Android 28 support lib?
At time of writing, Firebase depends on the support library versions 27 so you do need to provide explicit overrides. See the working build file below.
apply plugin: 'com.android.application'
android {
compileSdkVersion 28
defaultConfig {
applicationId "com.google.firebase.example.fireeats"
minSdkVersion 28
targetSdkVersion 28
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-v7:28.0.0'
implementation 'com.android.support:support-media-compat:28.0.0' // NEED TO ADD
implementation 'com.android.support:support-v4:28.0.0' //NEED TO ADD
implementation 'com.google.firebase:firebase-core:16.0.4'
testImplementation 'junit:junit:4.12'
androidTestImplementation 'com.android.support.test:runner:1.0.2'
androidTestImplementation 'com.android.support.test.espresso:espresso-core:3.0.2'
}
apply plugin: 'com.google.gms.google-services'

Android Studio -- Designer screen blank

I created a new Android Project in Android Studio 3.1.3 on Windows 7:
included Kotlin support
API 15: Android 4.0.3
Basic Activity
I opened content_main.xml in Design View. Even though it will have a TextView saying "Hello World" by default, this was not shown on the Design screen. Instead, what I am shown is a blank screen with "android...CoordinatorLayout" text in the center:
My build.gradle (Module: app) file is:
apply plugin: 'com.android.application'
apply plugin: 'kotlin-android'
apply plugin: 'kotlin-android-extensions'
android {
compileSdkVersion 28
defaultConfig {
applicationId "com.test.myapplication"
minSdkVersion 15
targetSdkVersion 28
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"org.jetbrains.kotlin:kotlin-stdlib-jre7:$kotlin_version"
implementation 'com.android.support:appcompat-v7:28.0.0-alpha3'
implementation 'com.android.support.constraint:constraint-layout:1.1.2'
implementation 'com.android.support:design:28.0.0-alpha3'
testImplementation 'junit:junit:4.12'
androidTestImplementation 'com.android.support.test:runner:1.0.2'
androidTestImplementation 'com.android.support.test.espresso:espresso-core:3.0.2'
}
Simply put, there is a problem with the versions of com.android.support:appcompat-v7 and com.android.support:design referenced, which cause the Designer to fail. Therefore you need to downgrade from API 28 down to 27 in order to use dependencies of version 27.1.1 for these dependencies. In build.gradle (Module: app):
Change compileSdkVersion to 27
Change targetSdkVersion to 27
Reference 27.1.1 for com.android.support:appcompat-v7
Reference 27.1.1 for com.android.support:design
This is how the file will look after you make the changes:
apply plugin: 'com.android.application'
apply plugin: 'kotlin-android'
apply plugin: 'kotlin-android-extensions'
android {
compileSdkVersion 27
defaultConfig {
applicationId "com.test.myapplication"
minSdkVersion 15
targetSdkVersion 27
versionCode 1
versionName "1.0"
testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
}
buildTypes {
release {
minifyEnabled false
proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
}
}
}
dependencies {
implementation fileTree(dir: 'libs', include: ['*.jar'])
implementation"org.jetbrains.kotlin:kotlin-stdlib-jre7:$kotlin_version"
implementation 'com.android.support:appcompat-v7:27.1.1'
implementation 'com.android.support.constraint:constraint-layout:1.1.2'
implementation 'com.android.support:design:27.1.1'
testImplementation 'junit:junit:4.12'
androidTestImplementation 'com.android.support.test:runner:1.0.2'
androidTestImplementation 'com.android.support.test.espresso:espresso-core:3.0.2'
}
Once you make the changes to build.gradle, a pop-up will ask you to "Sync Now", if you click on it, then after syncing, your designer will work:
(If you don't have version 27 of the SDK platform installed, then go to Tools → SDK Manager, and install Android 8.1 (Oreo) -- its API level is 27.

How to select other api level in Android studio?

I am following this tutorial.
I got a Render problem. By searching from web, I found that the api level should be changed to a lower version, link.
The problem is that I cannot select a lower api version:
How to solve it?
You can set the API level on your app build.gradle file. Open it on ProjectFolder/app/build.gradle.
You can work with a stable Android API (like 27) since Android P API (API level 28) is on Developer Preview stage.
android {
compileSdkVersion 27
defaultConfig {
applicationId "com.example.app"
minSdkVersion 21
targetSdkVersion 27
versionCode 1
versionName "1.0"
}
}
apply plugin: 'com.android.application'
android {
compileSdkVersion 26
defaultConfig {
applicationId "com.example.myfirstapp"
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-v7:26.0.0'
implementation 'com.android.support.constraint:constraint-layout:1.1.2'
testImplementation 'junit:junit:4.12'
androidTestImplementation 'com.android.support.test:runner:1.0.2'
androidTestImplementation 'com.android.support.test.espresso:espresso-core:3.0.2'
}
Finally, this is my build.gradle.

How to display Map on emulator

From Android Studio, I created a Map Activity project; so, there's no custom code.
The only custom changes made was copying the URL from the google_maps_api.xml _(https://console.developers.google.com/flows/enableapi?apiid=maps_android_backend&keyType=CLIENT_SIDE_ANDROID&r=)_ and using it to create an API key.
Android Studio: 3.0.1
Emulator: Nexus 5X with API 25
Build.gradle file
apply plugin: 'com.android.application'
apply plugin: 'kotlin-android'
apply plugin: 'kotlin-android-extensions'
android {
compileSdkVersion 26
defaultConfig {
applicationId "xxxx.xxx.xxxx"
minSdkVersion 19
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"org.jetbrains.kotlin:kotlin-stdlib-jre7:$kotlin_version"
implementation 'com.android.support:appcompat-v7:26.1.0'
implementation 'com.google.android.gms:play-services-maps:11.0.0'
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'
}
Screenshot
It seems like I'm missing something; I just don't know what it is.
Try to run in your mobile. Sometimes emulator is not able to load map properly, That's why it shows blank map without loading roots.

"Error:(2) Error retrieving parent for item No resource found that matches the given name 'android:TextAppearance.Material.Widget.Button.Inverse'

I have a problem with Gradle !!
It keeps showing me errors , can some one help me to resolve this problem
Note: It's my first time to install android studio
Try using this:
compile 'com.android.support:appcompat-v7:24.1.0'
Use latest support library and change your target and compile sdk also
compileSdkVersion 24
buildToolsVersion "24.0.1"
targetSdkVersion 24
Try it
compile "com.android.support:appcompat-v7:23.0.1"
and you can change targetSdkVersion 23
Please use my project gradle values and also update sdk libraries:
apply plugin: 'com.android.application'
android {
compileSdkVersion 23
buildToolsVersion "23.0.1"
defaultConfig {
multiDexEnabled true
applicationId "com.example.student" //change as your package name
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-v7:23.0.1'
}
Try to match all versions:
compileSdkVersion 23
buildToolsVersion '23.0.0'
targetSdkVersion 23
Add Following dependencies:
compile 'com.android.support:appcompat-v7:23.0.0'
Make sure you use latest version of Sdk:
how to update sdk
The problem is you're using
compile 'com.android.support:appcompat-v7:19.+'
which gives you all possibilities of Android 4.4.2 Kitkat API 19 and older.
In your project you're trying to use Material Themes which belongs to newer version, I mean com.android.support:appcompat:$version, where version > 21.
Material Design was introduced with Android 5.1 Lollipop API 21
I higly reccomend you to change your build.gradle file to:
apply plugin: 'com.android.application'
android {
compileSdkVersion 24
buildToolsVersion "24.0.2"
defaultConfig {
minSdkVersion 21
targetSdkVersion 21
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-v7:24.2.1"
}
but of course changing appcompat library to version :
com.android.support:appcompat-v7:23.0.1"
would be enough ;-)
Hope it would help

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