public static JNIWriter instance(Context context){
  JNIWriter instance=context.get(jniWriterKey);
  if (instance == null)   instance=new JNIWriter(context);
  return instance;
}

public static JNIWriter instance ( Context context ) { JNIWriter instance = context . get ( jniWriterKey ) ; if ( instance == null ) instance = new JNIWriter ( context ) ; return instance ; }
get the classwriter instance for this context .
