title: android : I have to downgrade my build tool version from 25.0.0 to 19.1.0
body: <p>I am working on library project. Currently my project is running on this version</p>
  
  <p><a href="https://i.stack.imgur.com/HH5fP.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/HH5fP.png" alt="enter image description here"></a></p>
  
  <p>But client require this version </p>
  
  <p><a href="https://i.stack.imgur.com/5acPb.jpg" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/5acPb.jpg" alt="enter image description here"></a></p>
  
  <p>when we change to this version in project structure 
  then this error is come</p>
  
  <p>Error:The SDK Build Tools revision (19.1.0) is too low for project ':projectSample'. Minimum required is 25.0.0</p>
  
  <p>android {
      compileSdkVersion 19
      buildToolsVersion '19.1.0'</p>
  
  <pre><code>defaultConfig {
      minSdkVersion 15
      targetSdkVersion 25
      versionCode 1
      versionName "1.0"
  
      testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
  
  }
  buildTypes {
      release {
          minifyEnabled false
          proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
      }
  }
  compileOptions {
      sourceCompatibility JavaVersion.VERSION_1_6
      targetCompatibility JavaVersion.VERSION_1_6
  }
  </code></pre>