How to install Sun Java 1.5/1.6 on Ubuntu 10.04

Ubuntu (10.04) only supports Java 1.6 (and prefers OpenJDK too). Here's how to get Sun Java 1.5 installed on Ubuntu 10.04:



Add the following to /etc/apt/sources.list:

deb http://us.archive.ubuntu.com/ubuntu/ jaunty multiverse

deb http://us.archive.ubuntu.com/ubuntu/ jaunty-updates multiverse



Update the package list:

sudo apt-get update



Install Sun Java 1.5/1.6:

sudo apt-get install sun-java5-jdk
sudo apt-get install sun-java6-jdk


Depending on your setup you might need to set this as the default. Check what version is default:

java -version


And list all Java versions installed:
sudo update-java-alternatives -l

Then if necessary:
sudo update-java-alternatives -s java-1.5.0-sun
or
sudo update-java-alternatives -s java-1.6.0-sun

Learn Android from APK

1. Unpack the APK file by using apktool (http://code.google.com/p/android-apktool/).

Apktool will generate the readable XML files, include the AndroidMenifest.XML and layout XML files. It also will generate the Java bytecode from java class.

2. Rename the APK to ZIP and unzip it, get the DEX file. Using dex2jar (http://code.google.com/p/dex2jar/)
Generate the JAR file.

3. Get Java file by JD (http://java.decompiler.free.fr/).
Generate the java files

4. Using Source Insight to browser the code.

Google Android secret_code for launching hidden activity

Dial *#*#<code>#*#* to launch the hidden activities.

For example:
Dial <*#*#4636#*#*> will be received by "TestingSettingsBroadcastReceiver".

--Phone.java------------------------------------------------------------------------------
static boolean handleSecretCode(Context context, String input) {


// Secret codes are in the form *#*##*#*

int len = input.length();

if (len > 8 && input.startsWith("*#*#") && input.endsWith("#*#*")) {

Intent intent = new Intent(Intents.SECRET_CODE_ACTION,

Uri.parse("android_secret_code://" + input.substring(4, len - 4)));

context.sendBroadcast(intent);

return true;

}


return false;

}
------------------------------------------------------------------------------

<receiver android:name="TestingSettingsBroadcastReceiver">

<intent-filter>
<action android:name="android.provider.Telephony.SECRET_CODE" />
<data android:scheme="android_secret_code" android:host="4636" />
</intent-filter>
</receiver>
------------------------------------------------------------------------------

<receiver android:name="TestingSettingsBroadcastReceiver">

<intent-filter>
<action android:name="android.provider.Telephony.SECRET_CODE" />
<data android:scheme="android_secret_code" android:host="225" />
</intent-filter>
</receiver>