文件操作

选择文件

1. 跳转选择文件：

        Intent intent = new Intent();
        intent.setAction(Intent.ACTION_GET_CONTENT);
        intent.setType("pdf/*");
        intent.addCategory(Intent.CATEGORY_OPENABLE);
        getCurrentActivity().startActivityForResult(intent, 2);

2. 处理返回结果；

   public void onActivityResult(Activity activity, int requestCode, int resultCode, Intent data) {
    if (requestCode == 2) {
        Uri uri = data.getData();
        String path = FileUtils.getRealPathFromURI(uri, getReactApplicationContext());
        WritableMap resultMap = Arguments.createMap();
        resultMap.putString("path", path);
        pdfPromise.resolve(resultMap);
    }
   }

   文件路径

   public static String getRealPathFromURI(Uri contentUri, Context context) {
    String[] proj = {MediaStore.Images.Media.DATA};
    Cursor cursor = context.getContentResolver().query(contentUri, proj, null, null, null);
    int column_index = cursor.getColumnIndexOrThrow(MediaStore.Images.Media.DATA);
    cursor.moveToFirst();
    String fileStr = cursor.getString(column_index);
    cursor.close();
    return fileStr;
   }