Question

我想从Parse.com的默认用户类中检索图像。我只想要名为“Image”的列中的值。

ParseUser currentuser = ParseUser.getCurrentUser();
ParseQuery<ParseObject> query = new ParseQuery<ParseObject>("following");
query.whereEqualTo("username", currentuser);

try {
    ob = query.find();
} catch (ParseException e) {
    e.printStackTrace();
}

“图片”是列名。

for (ParseObject user : ob) {
    // Locate images in pic column
    image = (ParseFile) user.get("Image");
}

如何应用循环来获取列表中的所有图像文件？

image.getDataInBackground(new GetDataCallback() {
     public void done(byte[] data, ParseException e) {
         if (e == null) {
             Bitmap pictureBitMap = BitmapFactory.decodeByteArray(data, 0, data.length);

             img.setImageBitmap(pictureBitMap);

             listView.setAdapter(new myCustomList(MainActivity.this));
         } else {
             // something went wrong
         }
     } 
});

Answer 1

考虑使用Universal Image Loader(UIL)这样的开源库，这样您就不必大量下载将其转换为Bitmap并将其设置为imageView的文件。

基本上你可以从parseFile中检索网址

ListBox

在UIL中只需传递url和imageView

即可

  public static SqlDataReader ExecuteReader(String connectionString, String commandText,
      CommandType commandType, params SqlParameter[] parameters) {
     SqlConnection conn = new SqlConnection(connectionString);

     using (SqlCommand cmd = new SqlCommand(commandText, conn)) {
        cmd.CommandType = commandType;
        cmd.Parameters.AddRange(parameters);

        conn.Open();
        // When using CommandBehavior.CloseConnection, the connection will be closed when the 
        // IDataReader is closed.
        SqlDataReader reader = cmd.ExecuteReader(CommandBehavior.CloseConnection);

        return reader;
     }
  }

从ParseUser检索图像时遇到问题

1 个答案: