I am new to Android development. Can I use my existing Java code developed using JDK 7 in Android?
The functions use xerces dom and xslt and xpathapi. Currently when I installed Android Eclipse ADT environment these functions are not compiling. I would also like to know whether an Android device itself supports JRE 6 or 7?
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JDK 5/6 ONLY. Actually andriod doesn't support jdk 6 completely because android jdk 6 is not Oracle JDK 6.
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Originally Android development tools supported only jdk 6 features. But that was changed, first by Android Studio 0.3.2 in October 2013 see: http://tools.android.com/recent/androidstudio032released
Support for language features like the diamond operator, multi-catch, try-with-resources, strings in switches, etc. When creating a new project, you can specify a source language level:
Note that you can use all these language features not just with Android KitKat, but with older versions of Android too! There is one exception to that: try-with-resources, which will require minSdkVersion 19. Therefore, Studio will flag any uses in your code of try-with-resources if your minSdkVersion is less than 19:
then by ADT plugin 22.6 in March 2014,see: http://developer.android.com/tools/sdk/eclipse-adt.html
Added support for Java 7 language features like multi-catch, try-with-resources, and the diamond operator. These features require version 19 or higher of the Build Tools. Try-with-resources requires minSdkVersion 19; the rest of the new language features require minSdkVersion 8 or higher. To use the new language features after installing ADT 22.6.0, ensure that you run Eclipse on JDK 7 and change your application project settings to use JDK 7.
Android is not intended to be 100% compatible with any Java SE API version, not 6 nor 8 nor any. this was the reason of the court case of Oracle raised Against Google, accusing Google of fragmenting Java. Some APIs are impossible to implement on android as Swing; Imagine a window with a close button on android ! Others were delayed but implemented : for e.g.: Charset class is in Java SE 1.4 but implemented in android API 9, AutoClosable in Java 7 implemented in Android API level 19 to allow implementation of try-with-resources language feature. Some APIs are existent but for different purpose as Console.
Firstly, there is a difference between the Java JDK and the JRE. The JRE is the Java Runtime Environment while the JDK is the Java Development Kit. It is the JDK that you need for Android application development along with the existing Android SDK.
The Android SDK can use either JDK 6 or 7, however, it can ONLY use the JDK 6 API.