title: What is "Program type already present"?
body: <p>When i try to build my project.i got this error </p>
  
  <blockquote>
    <p>Program type already present: android.support.v4.accessibilityservice.AccessibilityServiceInfoCompat
    Message{kind=ERROR, text=Program type already present: android.support.v4.accessibilityservice.AccessibilityServiceInfoCompat, sources=[Unknown source file], tool name=Optional.of(D8)}</p>
  </blockquote>
  
  <p>i also to find solution in stack overflow but it didn't help.here is my build.gradle file</p>
  
  <pre><code>    apply plugin: 'com.android.application'android {
  compileSdkVersion 28
  defaultConfig {
      applicationId "com.example.hassan.qrscan"
      minSdkVersion 18
      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'])
  //noinspection GradleCompatible
  implementation 'com.android.support:appcompat-v7:28.0.0-alpha1'
  implementation 'com.android.support.constraint:constraint-layout:1.0.2'
  implementation 'me.dm7.barcodescanner:zxing:1.9'
  implementation 'com.journeyapps:zxing-android-embedded:3.0.2@aar'
  implementation 'com.android.support:design:28.0.0'
  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'}
  </code></pre>