possumstew.com

Adding an external library to your Android project in Eclipse

karl — Fri, 28 Oct 2011 15:56:29 +0000

Adding an external library (.jar file) to an Android project in Eclipse is accomplished by adding the external jars to the Java build path. Here is the step-by-step procedure to do this (in the screenshots for this example I am adding the ZXing core.jar).

1. Open your Android project in Eclipse.

2. Select Project -> Properties

3. You are now in the Properties window. Select Java Build Path in the left pane and then select the Libraries tab. Now click Add External Jars….

4. You are now in the Jar Selection window. Navigate to select the .jar file you want to add and click Open.

5. You are now back in the Properties window and the path to the .jar file you selected in Step 4 is now displayed under the Libraries tab. Click OK.

Done! Open your Android project in the Project Explorer and you will now see the external .jar file listed in your project.

Search and replace multiple files

karl — Wed, 26 Oct 2011 23:23:42 +0000

Here is a very handy little perl command for making a simple edit to multiple files in a directory:

perl -pi -e 's/search/replace/g;' .

WordPress Permalinks not working

karl — Wed, 26 Oct 2011 02:49:29 +0000

I’ve had several instances where Permalinks (SEO links) have not immediately worked on new WordPress installations, resulting in “Page Not Found” errors. This is due to a configuration issue in the webserver (Apache, IIS, etc…). The fix is simple but might not be obvious if you aren’t familiar with webserver configuration.

First, let’s review what Permalinks are. Permalinks provide an “SEO friendly” URI for WordPress Pages and Posts.

So instead of the default format URI:

http://www.possumstew.com/?page=2

We get the nicer:

http://www.possumstew.com/wordpress-permalinks-not-working/

Now let’s look at how Permalinks are configured in WordPress. Click on “Settings” -> “Permalinks” in the WordPress admin menu and you will see a page similar to this:

Select one of the Permalink configuration options and click Save. WordPress will attempt to add the following code to the .htaccess file located in the the root directory of your installation:

# BEGIN WordPress

RewriteEngine On
RewriteBase /
RewriteRule ^index\.php$ – [L]
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteRule . /index.php [L]

# END WordPress

*IMPORTANT! WordPress must have permission to write to the .htaccess file. Contact your site administrator if this is not the case and you are unable to set the permission yourself.

If everything has gone as planned you should now be able to click on any link to your Pages or Posts and be taken the the Permalink URI. However if your webserver is not configured correctly you may get a “Not Found” error instead.

They key to solving this problem is your webserver’s AllowOverride directive (Apache, IIS, etc). AllowOverride is set in the webserver configuration file and must be located within a Directory section. For example:

AllowOverride All

Save this in your webserver configuration file and restart the webserver. Your Permalinks should now work.