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I am getting error in build.gradle file

All com.android.support libraries must use the exact same version specification (mixing versions can lead to runtime crashes). Found versions 28.0.0, 26.1.0. Examples include com.android.support:animated-vector-drawable:28.0.0 and com.android.support:support-media-compat:26.1.0 less... (Ctrl+F1) 
Inspection info:There are some combinations of libraries, or tools and libraries, that are incompatible, or can lead to bugs. One such incompatibility is compiling with a version of the Android support libraries that is not the latest version (or in particular, a version lower than your targetSdkVersion).

Here is my gradle file

android {
            compileSdkVersion 28
            defaultConfig {
                applicationId "com.pristology.mysociety"
                minSdkVersion 15
                targetSdkVersion 28
                versionCode 3
                versionName "1.0.3"
                testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
            buildTypes {
                release {
                    minifyEnabled false
                    proguardFiles getDefaultProguardFile('proguard-android-optimize.txt'), 'proguard-rules.pro'
            implementation fileTree(dir: 'libs', include: ['*.jar'])
            implementation 'com.android.support:appcompat-v7:28.0.0'

            implementation 'com.android.support:design: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'
            implementation 'com.android.support:cardview-v7:28.0.0'

I am getting warning in app level gradle file when update android studio 3.3.2

All com.android.support libraries must use the exact same version specification

It happens because some of your libraries use an old version support-media-compat.

Just add explicitly the version of the library in your dependencies

implementation 'com.android.support:support-media-compat:28.0.0'
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1st) you are getting problem because of different appcompat version so change your dependency because in gradle version 3.+ it causes problem

> implementation 'com.android.support:appcompat-v7:28.0.0'

to this version

implementation 'com.android.support:appcompat-v7:28.0.0'-alpha1

or you can use v7:27.1.1 but you have to change it everywhere in app:gradle

2nd) if you are using firebase then it will also cause problem so remove this line of code

implementation 'com.google.firebase:firebase-core:16.0.7'

because this line isn't necessary and u will get rid of this problem ;)

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