Develop Reference

How to correctly change MinSDKVersion from 15 to 16 for firebase

I was originally using minSDKVersion 15, but now have to change to 16 because I need to implement firebase. Using the previous version of firebase is not an option.
Simply changing the minSDKVersion to 16 in the build.gradle(Module:app) gives the following error:
Manifest merger failed : Attribute application#appComponentFactory value=(android.support.v4.app.CoreComponentFactory) from [com.android.support:support-compat:28.0.0] AndroidManifest.xml:22:18-91
is also present at [androidx.core:core:1.0.0] AndroidManifest.xml:22:18-86 value=(androidx.core.app.CoreComponentFactory).
Suggestion: add 'tools:replace="android:appComponentFactory"' to <application> element at AndroidManifest.xml:8:5-40:19 to override.
I did try the suggestion it provides to add 'tools:replace="android:appComponentFactory"' to the element in AndroidManifest.xml but that produces even more errors.
I changed my build.gradle(Module:app) file from this:
apply plugin: 'com.android.application'
android {
compileSdkVersion 28
defaultConfig {
applicationId "com.comapny.app"
minSdkVersion 15
targetSdkVersion 28
versionCode 1
versionName "1.0"
testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
}
buildTypes {
release {
minifyEnabled false
proguardFiles getDefaultProguardFile('proguard-android-optimize.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'
implementation 'com.android.support:design:28.0.0'
implementation 'com.android.support:support-v4:28.0.0'
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'
implementation 'com.android.volley:volley:1.1.0'
}
to this:
apply plugin: 'com.android.application'
android {
compileSdkVersion 28
defaultConfig {
applicationId "com.dataletix.gr8"
minSdkVersion 16
targetSdkVersion 28
versionCode 1
versionName "1.0"
testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
}
buildTypes {
release {
minifyEnabled false
proguardFiles getDefaultProguardFile('proguard-android-optimize.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'
implementation 'com.android.support:design:28.0.0'
implementation 'com.android.support:support-v4:28.0.0'
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'
implementation 'com.android.volley:volley:1.1.0'
implementation 'com.google.firebase:firebase-core:17.0.0'
}
apply plugin: 'com.google.gms.google-services'
Any Help will be greatly appreciated. Thank you.

Try to downgrade the firebase dependency from 17.0.0 to 16.0.7
This is the version that I'm currently using and it works.
Be very careful about firebase versions. There are some dependencies that will crash your project if you set the wrong version.
Here is a list of some stable dependencies that I use:
implementation 'com.google.firebase:firebase-core:16.0.7'
implementation 'com.google.firebase:firebase-messaging:17.4.0'
implementation 'com.google.firebase:firebase-auth:16.1.0'
implementation 'com.google.firebase:firebase-firestore:18.1.0'
implementation 'com.google.firebase:firebase-functions:16.3.0'
implementation 'com.google.firebase:firebase-perf:16.2.3'
implementation 'com.google.firebase:firebase-config:16.3.0'
implementation 'com.google.firebase:firebase-database:16.1.0'

How to fix appcompat error in android studio

I want to work with firebase real time database and when I implement firebase core and firebase database library appcompat get error.
My app module code is below?
android {
compileSdkVersion 27
defaultConfig {
applicationId "com.example.mahdi.smsreviver"
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 'com.android.support:appcompat-v7:27.1.1'
implementation 'com.android.support.constraint:constraint-layout:1.1.3'
implementation 'com.google.firebase:firebase-database:16.1.0'
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'
implementation 'com.google.firebase:firebase-core:16.0.7'
}
apply plugin: 'com.google.gms.google-services'

from firebase release note you are using the latest version(firebase-core 16.0.7) which conflicts with appcompat version(27.1.1)
so please update gradle
android {
compileSdkVersion 28
defaultConfig {
applicationId "com.example.mahdi.smsreviver"
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'
implementation 'com.google.firebase:firebase-database:16.0.6'
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'
implementation 'com.google.firebase:firebase-core:16.0.7'
}
apply plugin: 'com.google.gms.google-services'

Don't use appcompat, Use AndroidX the new support version library from Google.
It has better compatibility features and other noticeable features. Besides Appcompat is so Old.

Android Butterknife implementation error saying compile is obsolete and has been replaced with with 'implementation' and 'api'

I have implemented following in in build.app file
//dependency for view implementation
implementation 'com.jakewharton:butterknife:9.0.0-rc2'
annotationProcessor 'com.jakewharton:butterknife-compiler:9.0.0-rc2'
in my project but when i am running the application its giving following error:
Configuration 'compile' is obsolete and has been replaced with 'implementation' and 'api'.
It will be removed at the end of 2018. For more information see
//code of gradle
apply plugin: 'com.android.application'
android {
compileSdkVersion 28
defaultConfig {
applicationId "xyc.com"
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'
implementation'com.android.support.constraint:constraintlayout: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'
//recyclerview dependency
implementation 'com.android.support:recyclerview-v7:28.0.0'
compile 'com.android.support:cardview-v7:28.0.+'
implementation 'com.google.android.gms:play-services-location:15.0.1'
//dependency for view implementation
implementation 'com.jakewharton:butterknife:9.0.0-rc2'
annotationProcessor 'com.jakewharton:butterknife-compiler:9.0.0-rc2'
}

Getting a "failed to merge dex" error on Android Studio

I am a student and am stuck. I am getting this error:
Error:Execution failed for task ':app:transformDexArchiveWithExternalLibsDexMergerForDebug'.
> java.lang.RuntimeException: com.android.builder.dexing.DexArchiveMergerException: Unable to merge dex
Gradle:
apply plugin: 'com.android.application'
android {
compileSdkVersion 27
defaultConfig {
applicationId "com.example.ChangedThisforPrivacy"
minSdkVersion 22
targetSdkVersion 27
versionCode 1
versionName "1.0"
testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
multiDexEnabled true
}
buildTypes {
release {
minifyEnabled false
proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
}
}
}
dependencies {
implementation fileTree(dir: 'libs', include: ['*.jar'])
//noinspection GradleCompatible
implementation 'com.android.support:appcompat-v7:27.1.0'
implementation 'com.android.support.constraint:constraint-layout:1.1.0'
implementation 'com.android.support:support-v4:27.1.0'
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'
implementation "com.google.android.gms:play-services:12.0.1"
}
I have tried a Clean and then Build, and the issue remains.

Android conflict version gradle

im having a problem on my build.gradle which is a version conflict with firebase-auth and the com.google.android.gms.
Error message printscreen
Gradle source
apply plugin: 'com.android.application'
android {
compileSdkVersion 26
defaultConfig {
applicationId "pt.tomasdealmeida.sotreta"
minSdkVersion 21
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'
implementation 'com.android.support:design:26.1.0'
implementation 'com.android.support.constraint:constraint-layout:1.0.2'
implementation 'com.android.support:support-v4:26.1.0'
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'
implementation 'com.android.support:cardview-v7:26.1.0'
compile 'com.google.firebase:firebase-auth:11.8.0'
compile 'com.google.android.gms:play-services-ads:11.6.2'
}
apply plugin: 'com.google.gms.google-services'

try this
change this
compile 'com.google.android.gms:play-services-ads:11.6.2'
to
compile 'com.google.android.gms:play-services-ads:11.8.0'
and please cek this Release Note
December 18, 2017 - Google Play services 11.8.0 release