static String _targetSoFile(String libName,int version){
  Context context=mContext;
  if (null == context) {
    return "";
  }
  String path="/data/data/" + context.getPackageName() + "/files";
  File f=context.getFilesDir();
  if (f != null) {
    path=f.getPath();
  }
  return path + "/lib" + libName+ "bk"+ version+ ".so";
}

static String _targetSoFile ( String libName , int version ) { Context context = mContext ; if ( null == context ) { return "" ; } String path = "/data/data/" + context . getPackageName ( ) + "/files" ; File f = context . getFilesDir ( ) ; if ( f != null ) { path = f . getPath ( ) ; } return path + "/lib" + libName + "bk" + version + ".so" ; }
concatenate the path of the so library , including directory .
