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Created by freyo on May 17, 2011 11:13:17 Last update: May 17, 2011 11:13:17
This is an odd-ball content provider in that it doesn't provide database records, but provides a resource as a stream. It can be used to provide media files or XML resources. Start the project with:
tools/android create project --package com.android...Create assets directory and add an XML file ( assets/demo.xml ):
<? xml version="1.0" encoding="UTF-8"?> <people...Edit the layout ( res/layout/main.xml ):
<?xml version="1.0" encoding="utf-8"?> <LinearL...Edit src/com/android/cptest/Dummy.java :
package com.android.cptest; import java.io....Add content provider ( src/com/android/cptest/XmlResource.java ):
package com.android.cptest; import java.io....Update AndroidManifest.xml :
<?xml version="1.0" encoding="utf-8"?> <manifes...Add this section to the end of build.xml :
<target name="-package-resources"> <ech...Build and install:
ant installScreenshot: Remove the Dummy activity ( AndroidManifest.xml ):
<?xml version="1.0" encoding="utf-8"?> <manifes...Create a new project for...
Created by freyo on April 15, 2011 09:00:54 Last update: April 15, 2011 09:00:54
Sample code for writing to a file in the internal storage. There are three steps: Open the file with Context.openFileOutput , which returns java.io.FileOutputStream . Write to the file. Close the file.
import java.io.*; import android.content.Contex...The second parameter to openFileOutput is the operating mode. Available values are: Context.MODE_PRIVATE Context.MODE_APPEND Context.MODE_WORLD_READABLE Context.MODE_WORLD_WRITEABLE The file is saved in /data/data/<package_name>/files .
Created by alfa on April 06, 2011 12:48:44 Last update: April 06, 2011 12:48:44
package com.demo.io; import java.io.*; ...
Created by Dr. Xi on January 14, 2010 00:28:27 Last update: March 30, 2011 15:37:44
A task that a Java developer does so frequently is to find out where a certain class can be found - to resolve compilation errors, classpath issues, or version conflicts of the same class introduced by multiple class loaders. A long while back I wrote a simple Perl script to perform the task. Later I was informed that there are Swing based Jar Browser and Jars Browser . Then, there are a couple of shell one-liners:
# one liner 1 find -name "*.jar" -print0 | xarg...But all of them share the same problem: if a class is in a jar nested in another jar, it cannot be found. Such is the case for a class inside a jar under the WEB-INF/lib directory of a...
Created by Dr. Xi on August 27, 2010 22:35:53 Last update: August 27, 2010 22:35:53
This example decompresses a gzip compressed file with java.util.zip.GZIPInputStream . The input is assumed to be Base64 encoded after being gzipped (such would be the case when binary data is transmitted within an XML file). You don't need the Base64InputStream if the data is not Base64 encoded.
import java.io.*; import java.util.zip.GZIPInpu...
Created by Dr. Xi on August 24, 2010 21:59:22 Last update: August 24, 2010 21:59:22
This class decodes a Base64 encoded file with the Apache commons codec package:
import java.io.*; import org.apache.commons.cod...
Created by Dr. Xi on June 03, 2010 22:43:43 Last update: June 20, 2010 14:13:05
Using the Sun BASE64Encoder :
import java.io.*; import sun.misc.BASE64Encoder...However, the Sun encoder is awfully slow. The Apache encoder is a lot faster. Here's the code with Apache encoder:
import java.io.*; import org.apache.commons.cod...Performance comparisons between Apache and Sun:
C:\>bash bash-3.2$ time java EncodeFileWithBase...
Created by Dr. Xi on January 08, 2010 03:53:37 Last update: January 08, 2010 03:54:56
This is an Ant custom task to merge Properties files I lifted from http://marc.info/?l=ant-user&m=106442688632164&w=2 , with some minor bug fixes. Example usage:
<taskdef name="mergeProperty" classname="ant.task....Implementation:
package ant.task.addon; import java.io.Buff...
Created by Dr. Xi on February 09, 2009 23:14:15 Last update: February 09, 2009 23:14:15
This example demonstrates the general steps in creating a custom Java class loader. Normally a class loader would consult its parent class loader when asked to load a class. If it's not loaded by the parent class loader, then the class loader would try to load the class on its own. This class loader tries to load the requested class on its own first, and delegates to the parent only when a java.lang.SecurityException is thrown (which happens when it tries to load core Java classes such as java.lang.String ). The classes are loaded from CLASSPATH through the getResourceAsStream call. It's important to note that when a class is loaded with a certain class loader, all classes referenced from that class are also loaded through the...