title: Unable to resolve dependency for ':app@debug/compileClasspath': Could not resolve com.android.volley:volley:1.1.1
body: <p>I tried to import android volley into my project, but it failed. I dont know what happened. This is the build.gradle file:</p>
  
  <pre><code>apply plugin: 'com.android.application'
  
  android {
      compileSdkVersion 28
      defaultConfig {
          applicationId "com.example.root.wifi1"
          minSdkVersion 22
          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.constraint:constraint-layout:1.1.3'
      implementation 'com.android.volley:volley:1.1.1'
  
      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'
  }
  </code></pre>
  
  <p>And this is the build.gradle for project:</p>
  
  <pre><code> buildscript {
  
      repositories {
          google()
          jcenter()
      }
      dependencies {
          classpath 'com.android.tools.build:gradle:3.1.4'
  
  
          // NOTE: Do not place your application dependencies here; they belong
          // in the individual module build.gradle files
      }
  }
  
  allprojects {
      repositories {
          google()
          jcenter()
          //maven { url "https://jitpack.io" }
      }
  }
  
  task clean(type: Delete) {
      delete rootProject.buildDir
  }
  </code></pre>
  
  <p>I have tried using volley library version 1.1.1, 1.1.0, the one from mcxiaoke, and a few other versions, but none of them worked. I also tried to switch my gradle version, and also tried to create local library using android volley that I cloned. Someone suggested to add <code>maven { url "https://jitpack.io" }</code> to allproject repositories, I also tried it, but it also didnt work. Of course I have also tried to disable offline gradle from Settings menu, but it didnt change anything.</p>
  
  <p>this is the error :</p>
  
  <pre><code>Unable to resolve dependency for ':app@debug/compileClasspath': Could not resolve com.android.volley:volley:1.1.1.
  Unable to resolve dependency for ':app@debugAndroidTest/compileClasspath': Could not resolve com.android.volley:volley:1.1.1.
  Unable to resolve dependency for ':app@debugUnitTest/compileClasspath': Could not resolve com.android.volley:volley:1.1.1.
  Unable to resolve dependency for ':app@release/compileClasspath': Could not resolve com.android.volley:volley:1.1.1.
  Unable to resolve dependency for ':app@releaseUnitTest/compileClasspath': Could not resolve com.android.volley:volley:1.1.1.
  </code></pre>
  
  <p>Everytime I changed the volley version the error was just like that too.
  I dont know what to do now, please help</p>
  
  <p>PS: if i comment/remove the volley dependency my project works 100% fine, and  I dont use a proxy-protected internet</p>