ChatApp/app/build.gradle

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

android {
    compileSdkVersion 29
    buildToolsVersion "29.0.2"
    defaultConfig {
        applicationId "com.example.chatapp"
        minSdkVersion 28
        targetSdkVersion 29
        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 'androidx.appcompat:appcompat:1.1.0'
    implementation 'androidx.constraintlayout:constraintlayout:1.1.3'

    //noinspection GradleCompatible
    implementation 'com.android.support:appcompat-v7:21.0.+'
    //noinspection GradleCompatible
    implementation 'com.android.support:support-v4:27.1.1'
    //noinspection GradleCompatible
    implementation 'com.android.support:design:27.1.1'
    //noinspection GradleCompatible
    implementation 'com.android.support:cardview-v7:27.1.1'
    implementation 'com.google.firebase:firebase-auth:16.0.2'
    implementation 'com.google.firebase:firebase-database:16.0.1'
    implementation 'com.google.firebase:firebase-core:16.0.1'
    implementation 'com.google.firebase:firebase-storage:16.0.1'
    implementation 'com.rengwuxian.materialedittext:library:2.1.4'
    implementation 'de.hdodenhof:circleimageview:2.2.0'
    implementation 'com.github.bumptech.glide:glide:4.8.0'
    implementation 'com.xwray:groupie:2.1.0'
    implementation 'com.squareup.picasso:picasso:2.71828'
    implementation 'androidx.recyclerview:recyclerview:1.1.0'


    implementation 'androidx.legacy:legacy-support-v4:1.0.0'
    testImplementation 'junit:junit:4.12'
    androidTestImplementation 'androidx.test.ext:junit:1.1.1'
    androidTestImplementation 'androidx.test.espresso:espresso-core:3.2.0'
}