====Android====
The Java-Eeditor has a simple Android interface.

As a teacher you can use the Android Studio to create a hull project for your students and make it available for further work in the Java-Editor. The students can then expand the hull project in their familiar development environment Java Editor.

=== Installation of Android SDK ===
==Possibility 1==
[[https://developer.android.com/studio/index.html | Android Studio install]] installs the Android SDK automatically.

==Possibility 2==
Install the Android SDK only. On the page [[https://developer.android.com/studio/index.html | Install Android Studio]] scroll to //Get just the command line tools// and install the command line tools. These contain the SDK- manager with which you can install these components after:

<code>
sdkmanager "build-tools;25.0.2"
sdkmanager "platforms;android-25"
sdkmanager "platform-tools"
</code>

=== Preparation of Java-Editor ===
In the [[Configuration]] section of the Java-Editor, on the [[en:configuration#Android]] page, select the path to the Android SDK folder and enable Android mode.

=== Preparing an Android project ===
  * Build the project with Android Studio.
  * //gradlew.bat// must be present in the project folder and is usually created automatically by Android Studio.
  * Delete or rename the //local.properties// file in the project folder if it exists.

=== Build & Install===
  * Open the file to be edited in the Java-Editor.
  * If the apk is to be installed on a device, enable USB debugging on the device and connect the device via USB.
  * Click the blue start icon. The first run will probably take a little longer, as components still have to be installed.

=== Troubleshooting ===
If no install happens even though a device is connected:
  * be sure to connect only one device
  * enable USB debugging on the device
  * In the Android SDK, check if the file //adb.exe// exists in the folder sdk\platform-tools. Otherwise, adb should be installed with the Android SDk Manager.
  *Look in the output of the Java-Editor for //adb get-state// to see the connection status. Alternatively check the connection with //adb devices// in the Windows command prompt.

In case of the error message //Cannot resolve symbol 'R'// reduce the Graddle version to 2.0.0 in the file //build-gradle//, which is located in the project folder of the app.

In case of the error message //signatures do not match the previously installed version; Ignoring// delete the old version of the app on the phone.

=== Demo-App===
The demo app [[http://www.javaeditor.org/wiki/jedownload/MyFirstApp.zip | MyFirstApp]] shows what is possible in the Java-Editor with Android mode.

==Java Code==
  * In the Java-Editor open the //MainActivity.java// class from the folder ///MyFirstApp/app/src/main/java/com/example/feli/myfirstapp//
  * You can see a programmatically added text field, a button and an input field.
  * There is also the method //sendMessage//, which is linked to the button.
  * If necessary, open //DisplayMessageActivity.java//.

==XML-Layout===
  * Alternatively, layout elements can be added in the //activity_main.xml// XML file from the //MyFirstApp/app/src/main/res/layout// folder.
  * In the demo app in xml another button and another text field was created. The button is also linked to //sendMessage//.
  * Changes can be made in the XML file within the Java-Editor. Then click //Save//, go back to //MainActivity.java// and hit the blue icon //Transfer to Android//.
  * The app MyFirstApp is then on the phone in the list of installed apps.

===Code-Completion===
For code completion download the file [[http://www.javaeditor.org/wiki/jedownload/AndroidDocs.zip | AndroidDocs.zip]], unzip it and open the configuration via the Window menu. On the Java/Interpreter page, invoke Edit for //JavaDoc-Folders// and select the appropriate file from the unzipped zip file via allclasses-frame.html and save the changed settings.