Develop Reference

Grey screen showing up on layout xml after switching to Androidx

After switching to Androidx, when I go back to my activity xml, it shows nothing but a grey screen with "androidx.constraintlayout....ConstraintLayout"
I tried messing around with the gradle and switching the constrained layout version but no luck.
Someone please help me with this because I dont know what to do.
apply plugin: 'com.android.application'
android {
compileSdkVersion 28
defaultConfig {
applicationId "com.hammad.firstapplication"
minSdkVersion 22
targetSdkVersion 28
versionCode 1
versionName "1.0"
testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner"
}
buildTypes {
release {
minifyEnabled false
proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
}
}
}
dependencies {
implementation fileTree(dir: 'libs', include: ['*.jar'])
implementation 'androidx.appcompat:appcompat:1.0.2'
implementation 'androidx.constraintlayout:constraintlayout:2.0.0-alpha4'
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.gms:play-services-ads:18.0.0'
}

In Android Studio Press Build>>Rebuild Project

Try degrading your constraint layout verison
implementation 'androidx.constraintlayout:constraintlayout:2.0.0-alpha4'
Use 1.1.2 or 1.1.1 instead of 2.0.0-alpha4

Try click on the "Sync project with Gradle files” button shown by the arrow in the Android Studio:

What's the right material design library to use in my gradle, i've tried different solutions, it's not building successfully

I'm trying to test the FAB concept in my app but it's not working following the guidelines i got maybe because i didn't understand it well, see my gradle file below:
apply plugin: 'com.android.application'
android {
compileSdkVersion 28
defaultConfig {
applicationId "study.timmy.micah.materialdesignpractices"
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 'com.android.support:appcompat-v7:28.0.0-alpha1'
implementation 'com.android.support.constraint:constraint-layout:1.1.0'
implementation 'com.android.support:design:28.0.0-alpha1'
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'
}

Element is not allowed here inside of ConstraintLayout when layout tag is used

Is anyone having this strange problem? After enabling the data-binding and adding <layout>, all the child elements inside ConstraintLayout are no longer allowed.
The screenshot showing the problem with <layout>
If the problem occurs, the UI editor for ConstraintLayout will not work well.
Missing attributes in UI editor
Without <layout>, everything looks normal
Without layout tag
UI editor looks normal
I tried to reproduce the problem by creating a new module. The results are the same. Does anyone have an idea?
Here is the build.gradle
apply plugin: 'com.android.library'
android {
compileSdkVersion 28
defaultConfig {
minSdkVersion 16
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'
}
}
dataBinding {
enabled = true
}
}
dependencies {
implementation fileTree(dir: 'libs', include: ['*.jar'])
implementation 'com.android.support:appcompat-v7:28.0.0'
implementation 'com.android.support.constraint:constraint-layout:1.1.3'
implementation 'com.android.support:design:28.0.0'
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'
}

when i new a project in android studio error found in priview Render problem

Problem:
Render problem
Failed to load AppCompat ActionBar with unknown error. Tip: Try to refresh the layout.
A lot of people said change theme Theme.AppCompat.Light.DarkActionBar to Base.Theme.AppCompat.Light.DarkActionBar but still not solved. Of course I don't want to to this every time when I start a new project.
This problem gradle:
apply plugin: 'com.android.application'
android {
compileSdkVersion 28
defaultConfig {
applicationId "three.my.test.newtextapplication"
minSdkVersion 23
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.constraint:constraint-layout:1.1.3'
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'
}

Just change the 28 SDK to 27 and use 27.1.1 dependencies. And if you still want to use 28 then use 28-rc1. Hope this helps you to solve the problem.

Android Studio design view not displaying correctly

I have looked at numerous sites and the suggestions provided here at Stack Overflow. Everything works fine with my Android Studio, except the design view does not display anything. I can drag and drop widgets or modify the XML code by hand and the text gets updated fine, but the changes just don't register on the design or blueprint. I have tried deleting and reinstalling the IDE, changing the SDK version, doing build--> clean, resetting the cache, and adding dependencies. Below is my build.gradle Anyone with a critical eye have suggestions? I don't know what I'm doing.
apply plugin: 'com.android.application'
apply plugin: 'kotlin-android'
apply plugin: 'kotlin-android-extensions'
android {
compileSdkVersion 28
defaultConfig {
applicationId "com.mydrinkmixer.somerestaurant.mydrinkmixer"
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-jdk7:$kotlin_version"
implementation 'com.android.support:appcompat-v7:28.0.0-rc02'
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'
}