Android has provided a specific class just for debugging Cursors. It is called [DatabaseUtils][1].

Call the method [`DatabaseUtils.dumpCursorToString(cursor)`][2] to view the contents of your cursor.

This helper loops through and prints out the content of the Cursor for you, and returns the cursor to its original position so that it doesn&#39;t mess up your iterating logic.

  [1]: http://developer.android.com/reference/android/database/DatabaseUtils.html
  [2]: http://developer.android.com/reference/android/database/DatabaseUtils.html#dumpCursorToString%28android.database.Cursor%29

If that&#39;s null pointer exception, it seems your cursor really is null. 

I would use `Log.d()` to help debug my cursors, you can simply create a helper method to dump the whole row of your cursor to LogCat. 

I poked around StackOverflow and Google, but couldn&#39;t find anyone who has put together a comparison of authentication gems or plugins for Rails (I&#39;m looking for something for Rails 3). What authentication solutions are available for Rails 3, which are most popular, and what are the differences between them?

Rails 3 authentication solutions

How do i trim and get the value after a special character from a hidden field 
The hidden field value is like this

Code

    &lt;input type=-&quot;hidden&quot; val=&quot;/TEST/Name?3&quot;

How i get the value after the &quot;question mark&quot; symbol in jquery??

Get value from a string after a special character

Would anyone know how I can view what a cursor has in it during debugging so that I can determine the functionality of my database helper?

It keeps acting like it&#39;s returning data, but then when I attempt to use the `cursor.isNull(0)` method, I keep getting `NullPointerException` thrown and not being able to see what the cursor has in it while stepping through the execution is really frustrating me.

Any help would be extremely appreciated.

Thanks.

Viewing an Android database cursor

Would anyone know how I can view what a cursor has in it during debugging so that I can determine the functionality of my database helper?
It keeps acting like it's returning data, but then when I attempt to use the <code>cursor.isNull(0)</code> method, I keep getting <code>NullPointerException</code> thrown and not being able to see what the cursor has in it while stepping through the execution is really frustrating me.
Any help would be extremely appreciated.
Thanks.

Looking at the Android tutorials such as [the Notepad tutorial](http://developer.android.com/resources/tutorials/notepad/notepad-ex1.html), I noticed that almost all variables are named starting with the letter &#39;m&#39;. What convention is this, and where does it originate from?


Why do variable names often start with the letter &#39;m&#39;?

&gt; **Possible Duplicate:**  
&gt; [How to check internet access on Android? InetAddress never timeouts](https://stackoverflow.com/questions/1560788/how-to-check-internet-access-on-android-inetaddress-never-timeouts)  

&lt;!-- End of automatically inserted text --&gt;

I need to detect whether the Android device is connected to the Internet.

The `NetworkInfo` class provides a non-static method `isAvailable()` that sounds perfect.

Problem is that:

    NetworkInfo ni = new NetworkInfo();
    if (!ni.isAvailable()) {
        // do something
    }

throws this error:

&lt;!-- language: lang-none --&gt;

    The constructor NetworkInfo is not visible.

Safe bet is there is another class that returns a `NetworkInfo` object. But I don&#39;t know which.

1. How to get the above snippet of code to work?
2. How could I have found myself the information I needed in the online documentation?
3. Can you suggest a better way for this type of detection?

Detect whether there is an Internet connection available on Android

Why when i use SimpleCursorAdapter for ListView i have items height in ListView like this - ![listview image][1]

(My code based on [this][2])

**But when using arrays Listview items have big height**  

![listview big][3]

(I learn listview based on [this][4])

Row layout for item listview is

    &lt;?xml version=&quot;1.0&quot; encoding=&quot;utf-8&quot;?&gt;
    &lt;TextView android:id=&quot;@+id/text1&quot;
    xmlns:android=&quot;http://schemas.android.com/apk/res/android&quot;
    android:layout_width=&quot;wrap_content&quot;
    android:layout_height=&quot;wrap_content&quot;/&gt;

**So My question is why there is a difference in row heights when using ArrayAdapter and SimpleCursorAdapter?**


  [1]: http://i.stack.imgur.com/tS8xS.jpg
  [2]: https://stackoverflow.com/questions/2982948/sqlite-and-populating-list-view-android
  [3]: http://i.stack.imgur.com/tSrYu.png
  [4]: http://androidpeople.com/android-listview-example/

android listview item height

I&#39;m installing the Android SDK on a fresh installation of Fedora 14 (Linux). I installed eclipse, and ran the tools/android sdk tool to install all the Eclipse components for the SDK. I was able to get DDMS to install when selecting it by itself.

And for the last component - the Android developer tools, I&#39;m getting the ugly error message pasted below. 

Now I&#39;m Stuck in Eclipse dependency hell. 

I&#39;ve searched through the available packages in Fedora and I can&#39;t find the one that has the files necessary to satisfy this Eclipse dependency. Can anybody please translate what it is that Eclipse is asking for and what Fedora package it lives in?


The ugly error:

&lt;!-- language: lang-none --&gt;

    Cannot complete the install because one or more required items could not be found.
      Software being installed: Android Development Tools 0.9.9.v201009221407-60953 (com.android.ide.eclipse.adt.feature.group 0.9.9.v201009221407-60953)
      Missing requirement: Android Development Tools 0.9.9.v201009221407-60953 (com.android.ide.eclipse.adt.feature.group 0.9.9.v201009221407-60953) requires &#39;org.eclipse.wst.sse.core 0.0.0&#39; but it could not be found

ADT requires &#39;org.eclipse.wst.sse.core 0.0.0&#39; but it could not be found

I need to pass a reference to the class that does the majority of my processing through a bundle.

The problem is it has nothing to do with intents or contexts and has a large amount of non-primitive objects. How do I package the class into a parcelable/serializable and pass it to a `startActivityForResult`?

How to send objects through bundle

I come from a C++ background, so apologies if this is a non-C# way of thinking, but I just need to know. :)

In C++ if I have two pointers, and I want to know if they point to the same thing, I can look in the memory/watch window and see their value - to see if they are pointing to the same memory space.

In C#, I haven&#39;t been able to find something along those lines.  One reference type with exactly the same values could in fact be the exact same object, or it could be something wildly different.

Is there a way for me to see this kind of information in C#?  Perhaps some kind of equivalent to the &amp; operator for the watch window or some such?

Uniquely Identifying Reference Types in the Debugger

Recently, I came across an issue where a CGI application is not responding. Symptom is Firefox displaying:

&gt; Transferring data from localhost...

But the thing is I cannot see any traffic from Firebug&#39;s Net panel, and the browser just stays on the same stage forever.

I am thinking about the ways to debug this application but I cannot see the source code or any of its compiled Java/C++ components, therefore I reckon a HTTP network level of diagnostics is a good start.

I have little experience in Fiddler and Wireshark, just wondering will they get better feedback/statistics in the HTTP network level? I&#39;ve heard Wireshark is advanced but could possibly introduce a large volume of traffic so system admins don&#39;t like it very much. At this time I think Firebug doesn&#39;t really show me enough information.

I need to collect information so that I can then forward to client as proof.

Wireshark vs Firebug vs Fiddler - pros and cons?

Is it possible write a string or log into the console?

## What I mean

Just like in JSP, if we print something like `system.out.println(&quot;some&quot;)`, it will be there at the console, not at a page.


How can I write to the console in PHP?

Is it possible to do reverse execution in Eclipse debugger? The current project I&#39;m working on requires a minimum of 5 seconds to read and initialize data from a file before anything can be done.  If I overstep in the debugger, I have to terminate the program and restart, and this takes a fair bit of time.



How to step back in Eclipse debugger?

When using Visual Studio 2008 and debugging my unit tests... sometimes the debugger works fine. However very often after modifying some code then clicking &quot;Debug Unit Test&quot; Visual Studio will fail to hit the breakpoints in the code. The debugger basically hangs and eventually the tests runs with the new code anyway, but never stops to let me see what is going on.

I&#39;m assuming this has something to do with some type of assembly caching done by the debugger, but not matter what I do (clean project, delete bin folders, restart VS, etc) I can never get the right assembly to load. Has anyone else seen this behavior? Any solutions?

By the way, using Resharper 4.5, and .NET 3.5 on Win XP.

Visual Studio &quot;Debug Unit Test&quot; fails to hit breakpoints

I have a table layout that I want to populate with the result from a database query. I use a select all and the query returns four rows of data. 

I use this code to populate the TextViews inside the table rows.

```java
Cursor c = null;
c = dh.getAlternative2();
startManagingCursor(c);
// the desired columns to be bound
String[] columns = new String[] {DataHelper.KEY_ALT};
// the XML defined views which the data will be bound to
int[] to = new int[] { R.id.name_entry};

SimpleCursorAdapter mAdapter = new SimpleCursorAdapter(this, 
		 R.layout.list_example_entry, c, columns, to);
this.setListAdapter(mAdapter);
```

I want to be able to separate the four different values of KEY_ALT, and choose where they go. I want them to populate four different TextViews instead of one in my example above.

How can I iterate through the resulting cursor?

Iterate through rows from Sqlite-query

I have a cursor containing several columns from the row it brings back that I would like to process at once.  I notice most of the examples I&#39;ve seeing on how to use cursors show them assigning a particular column from the cursor to a scalar value one at a time, then moving to the next row, 

e.g.

    OPEN db_cursor  
    FETCH NEXT FROM db_cursor INTO @name  
    
    WHILE @@FETCH_STATUS = 0  
    BEGIN  
           --Do Stuff with @name scalar value, then get next row from cursor
    
           FETCH NEXT FROM db_cursor INTO @name  
    END

What I want to know is if it&#39;s possible to do something like the following:

        OPEN db_cursor  
        FETCH NEXT FROM db_cursor; 
        
        WHILE @@FETCH_STATUS = 0  
        BEGIN  
               SET @myName = db_cursor.name;
               SET @myAge = db_cursor.age;
               SET @myFavoriteColor = db_cursor.favoriteColor;
               --Do stuff with scalar values

               FETCH NEXT FROM db_cursor; 
        END

Help is always appreciated.

Get Multiple Values in SQL Server Cursor

I&#39;m completely new to [Python&#39;s sqlite3 module][1] (and SQL in general for that matter), and this just completely stumps me. The abundant lack of descriptions of [`cursor` objects][2] (rather, their necessity) also seems odd. 

This snippet of code is the preferred way of doing things:

    import sqlite3
    conn = sqlite3.connect(&quot;db.sqlite&quot;)
    c = conn.cursor()
    c.execute(&#39;&#39;&#39;insert into table &quot;users&quot; values (&quot;Jack Bauer&quot;, &quot;555-555-5555&quot;)&#39;&#39;&#39;)
    conn.commit()
    c.close()

This one isn&#39;t, even though it works just as well and without the (seemingly pointless) `cursor`:

    import sqlite3
    conn = sqlite3.connect(&quot;db.sqlite&quot;)
    conn.execute(&#39;&#39;&#39;insert into table &quot;users&quot; values (&quot;Jack Bauer&quot;, &quot;555-555-5555&quot;)&#39;&#39;&#39;)
    conn.commit()

Can anyone tell me why I need a `cursor`?
&lt;br /&gt;It just seems like pointless overhead. For every method in my script that accesses a database, I&#39;m supposed to create and destroy a `cursor`?
&lt;br /&gt;Why not just use the `connection` object?


  [1]: https://docs.python.org/3.6/library/sqlite3.html
  [2]: https://docs.python.org/3.6/library/sqlite3.html#cursor-objects

Why do you need to create a cursor when querying a sqlite database?

I have a table with huge amount of data. I&#39;d like to add extra column `id` and use it as a primary key. What is the better way to fill this column with values from one `1` to `row count` 

Currently I&#39;m using cursor and updating rows one by one. It takes hours. Is there a way to do that quicker?

Thank you

SQL Server: how to add new identity column and populate column with ids?

I am using custom adapter extending cursor adapter for displaying data in listview, to display particular phone number i have passed the id to a method in database class but it is showing 

    errorandroid.database.CursorIndexOutOfBoundsException: Index 0 requested, with a size of 0 

while placing debugger in the the method it is not going after the line

    num = cursor.getString(cursor.getColumnIndex(&quot;ContactNumber&quot;));

Can any one help me to solve it.
This is the code:

    public String getNumberFromId(int id) 
	{
		String num;
		db= this.getReadableDatabase();
		Cursor cursor = db.query(scheduletable, new String[] { &quot;ContactNumber&quot; },&quot;_id=&quot;+id, null, null, null, null);
		cursor.moveToFirst();
		num = cursor.getString(cursor.getColumnIndex(&quot;ContactNumber&quot;)); 
		cursor.close();
		db.close();
		return num;
	}

Content Type	Original Author	Original Content on Stackoverflow
Question	Skittles	View Question on Stackoverflow
Solution 1 - Android	Some Noob Student	View Answer on Stackoverflow
Solution 2 - Android	xandy	View Answer on Stackoverflow

Viewing an Android database cursor

Android Problem Overview

Android Solutions

Solution 1 - Android

Solution 2 - Android

Get value from a string after a special character

Rails 3 authentication solutions

Attributions