cursor | 易学教程

When to close cursor in Android?

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问题 I have an app that uses cursor to select data via rawQuery from a sqlite db to populate a ListView in Android;. Every time the user clicks on a listview item I create a new instance of Activity to re-populate listview. Is it better to call cursor.close() and db.close() to avoid memory problems? I actually have db.close() in OnDestroy() of my activity. 回答1: You can close the cursor once you have retrieved the values for that particular object inside your method. btw...You don't have to

How to change VIM cursor shape while in different modes in Gnome Terminal

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问题 I would like to change VIM's (not gVIM's) cursor depending on what mode I am currently in. I would like: Normal & Visual modes = block cursor Insert & Command modes = I beam cursor I tried adding the following code to .vimrc but it did not work. if has("autocmd") au InsertEnter * silent execute "!gconftool-2 --type string --set /apps/gnome-terminal/profiles/Default/cursor_shape ibeam" au InsertLeave * silent execute "!gconftool-2 --type string --set /apps/gnome-terminal/profiles/Default

Javascript-firefox: how to set custom cursor from local png file?

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问题 how do you set a custom cursor for the current page from a local image file? basically I need to change to a different cursor programmatically using javascript, but the cursor is stored locally on my hard drive. 回答1: You can't ( but see below ), because the file:// cannot be accessed or referred from other protocols. The basic way to include a cursor through JavaScript is: element.style.cursor = "url(...location-of-pic...), auto"; // ^^^^^^ (required as fallback) You can convert your image to

Android: Content resolver query returning 0 rows when it ought not to

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问题 Cursor cursor = resolver.query( Data.CONTENT_URI, DataQuery.PROJECTION, DataQuery.SELECTION, new String[] {String.valueOf(rawContactId)}, null); With PROJECTION being: public static final String[] PROJECTION = new String[] { Data._ID, Data.MIMETYPE, Data.DATA1, Data.DATA2, Data.DATA3}; and SELECTION being: public static final String SELECTION = Data.RAW_CONTACT_ID + "=?"; The rawcontactId does return values, I've made logs to check. To give it some context I'm working with Account sync. The

Solr cursor marker and pagination

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I want to use Solr for my website as a search engine and I am trying to understand the difference between basic paging and deep paging with cursor marker. As far as I understand, if you use the basic pagination and query the page 1001 with 20 results per page this will happen: Solr will find the first 1000*20 matching results display the next 20 results for 1001 page I guess the problem is when someone clicks next page. Solr will find first the 1001*20 results and after that will show the desired results. I haven't seen a proper example for deep paging with large numbers. Only with small

CursorWindowAllocationException in standard ORMLite method

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问题 I need save some objects in DB. I'm using this code in my Dao class. public void saveActions(List<Action> actionList) throws SQLException { for (Action action : actionList) { createOrUpdate(action); } } And sometimes I have CursorWindowAllocationException in createOrUpdate() function. Here is stacktrace of error. java.lang.RuntimeException: An error occured while executing doInBackground() at android.os.AsyncTask$3.done(AsyncTask.java:300) at java.util.concurrent.FutureTask.finishCompletion

HTML+css整理笔记

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HTML+CSS 一、元素 1. <html> HTML 文件 </html> 2. <head> 头 </head> 详见 : 二 mata 用法和属性及外部文件引入 3. <title> 标题 </title> 4. <meta /> 详见 : 二 mata 用法和属性 5. <body> 主体 </body> 插入背景图片详见 : 三 img 用法和属性及背景图 6. <h1> 标题 </h1> : 标题取值1-6, 1字体最大,6字体最小; 7. <b> 粗体 </b>: 粗体 ; 8. <i> 斜体 </i>: 斜体; 9. <u> 下划线 </u>: 下划线 ; 10. <em> 斜体强调 </em>: 斜体强调; 11. <strong> 粗体强调 </strong>: 粗体强调; 12. <font> 字体 </font>: 字体; 13. <p> 段落 </p>: 段落; 14. <button> 按钮 </button> : 按钮; 15. <pre> 原格式输出 </pre> : 原格式输出; 16. <br/> : 换行; 17. <hr/> : 水平线; 18. <img /> : 插入图片; 详见 : 三 img 用法和属性及背景图 19. <embed> 视频音乐 </embed> : 插入视频音乐; 详见 : 四 embed 用法和属性 20.

JavaFX Transparent Cursor using WritableImage

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问题 Edit-Answer: You can check Fabian's answer and also this library (https://github.com/goxr3plus/JFXCustomCursor) Actual Question I want to create a cursor which is fading out in JavaFX so for that i am using a WritableImage and i am continuously reading pixels from the original Image and writing them to a new WritableImage .Then i set a custom cursor to the Scene using ImageCursor(writableImage) ,below is the full code( give it a try ). The problem is that a get black pixels where transparent

Android ListView with SimpleCursorAdapter - CursorIndexOutOfBoundsException error

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问题 I have a ListView in AcitivityA that is populated using a custom SimpleCursorAdapter called RecipeAdapter . The adapter holds data from SQLite There is a EditText view at the top of the ListView , that filters the listview as the user searches for a recipe. When a user clicks on a item in the filtered ListView , ActivityB starts. This all works perfectly. However when the user presses the backbutton to resume ActivityB , I get the following error. java.lang.RuntimeException: Unable to resume

JavaFX TextArea setCursor not working

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问题 I am having issues getting setCursor() to work properly in TextArea. I am not seeing any other search results at all for issues with this, and might be doing something silly because no one else has addressed this yet. I have tried different options, with no luck. Here are a few attempts below: Coding this below makes it so only the outer edges are effected by the setCursor. textArea.setCursor(Cursor.DEFAULT); In FXML, I get the following if I add it in with Scene Builder. <TextArea fx:id=