public class DataFilesUtils {
 //直接获取data权限
 public static void startForRoot(Activity context, int REQUEST_CODE_FOR_DIR) {
  Uri uri = Uri.parse("content://com.android.externalstorage.documents/tree/primary%3AAndroid%2Fdata");
  DocumentFile documentFile = DocumentFile.fromTreeUri(context, uri);
  Intent intent = new Intent(Intent.ACTION_OPEN_DOCUMENT_TREE);
  intent.setFlags(Intent.FLAG_GRANT_READ_URI_PERMISSION
    | Intent.FLAG_GRANT_WRITE_URI_PERMISSION
    | Intent.FLAG_GRANT_PERSISTABLE_URI_PERMISSION
    | Intent.FLAG_GRANT_PREFIX_URI_PERMISSION);
  intent.putExtra(DocumentsContract.EXTRA_INITIAL_URI, documentFile.getUri());
  context.startActivityForResult(intent, REQUEST_CODE_FOR_DIR);
 }

 //在ActivityResult中保存权限
 public static void savePermission(Context context,Intent data){
  Uri uriTree = data.getData();
  if(uriTree == null){
   return;
  }
  final int takeFlags = data.getFlags() & (Intent.FLAG_GRANT_READ_URI_PERMISSION | Intent.FLAG_GRANT_WRITE_URI_PERMISSION);
  context.getContentResolver().takePersistableUriPermission(uriTree, takeFlags);
 }

 //判断是否已经获取了Data权限，改改逻辑就能判断其他目录，懂得都懂
 public static boolean isGrant(Context context) {
  for (UriPermission persistedUriPermission : context.getContentResolver().getPersistedUriPermissions()) {
   if (persistedUriPermission.isReadPermission() && persistedUriPermission.getUri().toString().equals("content://com.android.externalstorage.documents/tree/primary%3AAndroid%2Fdata")) {
    return true;
   }
  }
  return false;
 }

 //获取Android/data目录
 public static DocumentFile getDataFile(Context context){
  Uri uri = Uri.parse("content://com.android.externalstorage.documents/tree/primary%3AAndroid%2Fdata");
  return DocumentFile.fromTreeUri(context, uri);
 }

 //根据路径获得document文件
 public static DocumentFile getDoucmentFile(Context context, String path) {
  if (path.endsWith("/")) {
   path = path.substring(0, path.length() - 1);
  }
  String path2 = path.replace("/storage/emulated/0/", "").replace("/", "%2F");
  Uri uri = Uri.parse("content://com.android.externalstorage.documents/tree/primary%3AAndroid%2Fdata/document/primary%3A" + path2);
  return DocumentFile.fromSingleUri(context, uri);
 }
}