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I'm a beginner for android. I want to develop an app for the detection of conference call. so in this line, I faced there is no default constructor available android.telecom.Conferenceable.

 import android.telecom.Conferenceable;
 import android.telecom.Connection;

 public abstract class Conference extends Conferenceable {
    @Override
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    It is good practice on stackoverflow to post the relevant lines of your code, and the relevant parts of your stack trace. I'm sure you need a no-argument constructor which you don't have, but I don't know because you don't show the code. – Christine Feb 16 '20 at 16:32
  • @f1sh has mentioned correctly the reason to the problem – mohd shoaib Feb 16 '20 at 16:35
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    I know they have. I'm trying to educate the person asking the question, to no avail, I see. – Christine Feb 16 '20 at 16:42

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