Styjun

// Top-level build file where you can add configuration options common to all sub-projects/modules.

buildscript 
 repositories 
 google()
 jcenter()

 
 dependencies 
 classpath 'com.android.tools.build:gradle:3.3.2'
 classpath 'com.google.gms:google-services:4.2.0'


 // NOTE: Do not place your application dependencies here; they belong
 // in the individual module build.gradle files
 


allprojects 
 repositories 
 google()
 jcenter()

 


task clean(type: Delete) 
 delete rootProject.buildDir

My build.gradle Project

 apply plugin: 'com.android.application'

android 
 compileSdkVersion 28
 defaultConfig 
 applicationId "com.example.blogapp"
 minSdkVersion 19
 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'


 // firebase core

 implementation 'com.google.firebase:firebase-core:16.0.1'

 // firebase auth
 implementation 'com.google.firebase:firebase-auth:16.0.1'

 // firebase storage
 implementation 'com.google.firebase:firebase-storage:16.0.1'

 implementation 'com.google.android.material:material:1.1.0-alpha04'

 implementation 'com.android.support:support-v4:28.0.0'
 implementation 'com.android.support:recyclerview-v7:28.0.0'
 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'

 // Design library for Coordinator Layout and Toolbars
 implementation 'com.android.support:design:28.0.0'





apply plugin: 'com.google.gms.google-services'

This is my build.gradle project

 <?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
 xmlns:app="http://schemas.android.com/apk/res-auto"
 xmlns:tools="http://schemas.android.com/tools"
 android:layout_width="match_parent"
 android:layout_height="match_parent"
 tools:context=".Activities.HomeActivity">

 <FrameLayout
 android:layout_width="match_parent"
 android:layout_height="match_parent"
 android:layout_above="@+id/bottom"
 android:id="@+id/fragment_container" />


 <android.support.design.widget.AppBarLayout
 android:layout_width="match_parent"
 android:layout_height="wrap_content"
 android:id="@+id/bottom"
 android:layout_alignParentBottom="true"
 >


 <android.support.design.widget.BottomNavigationView
 android:layout_width="match_parent"
 android:layout_height="wrap_content"
 android:id="@+id/bottom_navigation"
 app:itemIconTint="@color/colorAccent"
 app:labelVisibilityMode="unlabeled"
 android:background="?android:attr/windowBackground"
 app:menu="@menu/bottom_navigation">

 </android.support.design.widget.BottomNavigationView>

 </android.support.design.widget.AppBarLayout>


</RelativeLayout>

my Activity_home.xml

my 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:1.1.0-alpha03] AndroidManifest.xml:22:18-86 value=(androidx.core.app.CoreComponentFactory).
 Suggestion: add 'tools:replace="android:appComponentFactory"' to <application> element at AndroidManifest.xml:7:5-25:19 to override.

I can't solve even though i already try all things. Even though I add these two lines of code in application tag in manifest.xml.

tools:replace="android:appComponentFactory"
android:appComponentFactory="whateverString"

but it didn't work, after that show error more.

How can I solve this?

Manifest merger failed: Attribute application@appComponentFactory

Android design support library for API 28 (P) not working

Since you are not using androidx you don't need

 implementation com.google.android.material:material

remove this line from gradle.

For androidx

 com.google.android.material:material

should be used, and if you are using support library

 com.android.support:design

is enough.

Adding the below properties in your gradle.properties file can resolve your problem.

android.useAndroidX=true
android.enableJetifier=true