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Answer can be found underneath

chainstair
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    Post the solution as an answer and then accept it. Also, this is probably a duplicate of either [1](https://stackoverflow.com/questions/47417419/java-lang-noclassdeffounderror-failed-resolution-of-landroid-support-v4-view-k) or [2](https://stackoverflow.com/questions/43320496/noclassdeffounderror-android-support-v4-animation-animatorcompathelper) – denvercoder9 Mar 02 '18 at 11:44
  • I will do so... But this is definetly not a duplicate of the from you mentioned posts. Otherwise I wouldnt post this one. I've seen those already... But still want to thank you – chainstair Mar 03 '18 at 12:50

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As I had problems with

java.lang.NoSuchMethodError: No static method isCtrlPressed(Landroid/view/KeyEvent;)

and with

java.lang.NoClassDefFoundError: Failed resolution of: Landroid/support/v4/view/KeyEventCompat

I wanted to help u and show u how i managed to solve these problems.

I use:

 compileSdkVersion 27
 minSdkVersion 21
 targetSdkVersion 27
 versionName '2.6'
 versionCode 8
 buildToolsVersion '27.0.3'

I needed just to remove all old support dependencies from the gradle (for example: com.android.support:support-v4:25.1.0). And then add those two lines:

- implementation 'com.android.support:support-v4:27.1.0'

- implementation 'com.android.support:appcompat-v7:27.1.0'
chainstair
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