java - 轻松使用 CursorLoader

Question

我尝试使用 CursorLoader，但我不明白如何填写参数。

对于我的应用程序，我需要在一列中观察该值是否为 false 并获取该行的 id。

     String[] projection = { 
         TableLifetouchRespirationRate.COLUMN_ACKNOWLEDGMENT_MESSAGE
         };        


Context context = this;
Uri uri = IsansysPatientGatewayContentProvider.CONTENT_URI_RESPIRATION_RATES;
String selection = TableLifetouchRespirationRate.COLUMN_ACKNOWLEDGMENT_MESSAGE ;
String[] selectionArgs = null;
String sortOrder = null;

    cursorLoader = new CursorLoader(context, uri, projection, selection + "=?", selectionArgs, sortOrder);

在 SQL 中它看起来像这样:

SELECT id FROM TableLifetouchRespirationRate WHERE acknolegment_message = false

你能给我一个使用游标加载器的例子吗？

Answer 1

我找到了自己:)

    Context context = this;
// URI table
Uri uri = IsansysPatientGatewayContentProvider.CONTENT_URI_RESPIRATION_RATES;
// URI columns to get from table class
String[] projection = { 
        TableLifetouchRespirationRate.COLUMN_ID, 
        TableLifetouchRespirationRate.COLUMN_LIFETOUCH_ID, 
        TableLifetouchRespirationRate.COLUMN_RESPIRATION_RATE,
        TableLifetouchRespirationRate.COLUMN_ACKNOWLEDGMENT_MESSAGE, 
        TableLifetouchRespirationRate.COLUMN_TIMESTAMP,
        TableLifetouchRespirationRate.COLUMN_SESSION_NUMBER
        };       
// In the column ACKNOWLEDGMENT_MESSAGE...
String selection = TableLifetouchRespirationRate.COLUMN_ACKNOWLEDGMENT_MESSAGE  + "=?"; 
// Select rows = "0" (it is possible to add augments on several columns)
String[] selectionArgs = {"0"};
String sortOrder = null;

cursorLoader = new CursorLoader(context, uri, projection, selection, selectionArgs, sortOrder);

玩得开心!