How to use

checkNotDone

method

in

com.android.apksig.DefaultApkSignerEngine$GetJarEntryDataDigestRequest

@Override
public DataSink getDataSink() {
  synchronized (mLock) {
    checkNotDone();
    if (mDataSink == null) {
      mDataSink = new MessageDigestSink(new MessageDigest[] {getMessageDigest()});
    }
    return mDataSink;
  }
}