问题
I Want to save a xml File on Android before I asked a questions how to Get a File now I'm stuck ;( I use Gluon(Netbeans plugin and did already everything what He said: JavaFXPorts(Gluon Plugin) Saving Files on Android
Can you help me I want to save a XML File on Android, this is my Code yet:
public static void loadConfig() throws JAXBException {
if (ConfigFile.length() != 0) {
JAXBContext jaxbContext = JAXBContext.newInstance(Info.class);
Unmarshaller jaxbUnmarshaller = jaxbContext.createUnmarshaller();
info = (Info) jaxbUnmarshaller.unmarshal(ConfigFile);
} else {
info = new Info();
}
}
public static void saveConfig() {
try {
info.setAge(10);
JAXBContext context = JAXBContext.newInstance(Info.class);
Marshaller m = context.createMarshaller();
m.setProperty(Marshaller.JAXB_FORMATTED_OUTPUT, Boolean.TRUE);
m.marshal(info, ConfigFile);
} catch (PropertyException ex) {
Logger.getLogger(STM_WU_LABOR.class.getName()).log(Level.SEVERE, null, ex);
} catch (JAXBException ex) {
Logger.getLogger(STM_WU_LABOR.class.getName()).log(Level.SEVERE, null, ex);
}
}
public File getFile() throws IOException {
File path = PlatformFactory.getPlatform().getPrivateStorage();
return new File(path, "config.xml");
}
Here is how i call it:
ConfigFile = getFile();
if (!ConfigFile.exists()) {
ConfigFile.createNewFile();
}
And this is the Info class:
package com.stm_wu_labor;
import javax.xml.bind.annotation.XmlRootElement;
/**
*
* @author Merduma
*/
@XmlRootElement
public class Info {
Info() {
}
public Info(String gender, int age, int SchoolClass) {
this.gender = gender;
this.age = age;
this.SchoolClass = SchoolClass;
}
private String gender;
public String getGender() {
return gender;
}
public void setGender(String gender) {
this.gender = gender;
}
public int getAge() {
return age;
}
public void setAge(int age) {
this.age = age;
}
public int getSchoolClass() {
return SchoolClass;
}
public void setSchoolClass(int SchoolClass) {
this.SchoolClass = SchoolClass;
}
private int age;
private int SchoolClass;
}
The Programm stops when i try to start it on Android please help me
Here is adb logcat(I hope this is relevant):
I/System.out(13007): The programm started
I/System.out(13007): Succesfully started
I/System.out(13007): Info was added
W/art (13007): Unresolved exception class when finding catch block: javax.xml.bind.PropertyException
W/art (13007): Unresolved exception class when finding catch block: javax.xml.bind.JAXBException
W/System.err(13007): Exception in Application start method
I/System.out(13007): QuantumRenderer: shutdown
W/System.err(13007): java.lang.reflect.InvocationTargetException
W/System.err(13007): at java.lang.reflect.Method.invoke(Native Method)
W/System.err(13007): at java.lang.reflect.Method.invoke(Method.java:372)
W/System.err(13007): at javafxports.android.DalvikLauncher$1.run(DalvikLauncher.java:188)
W/System.err(13007): at java.lang.Thread.run(Thread.java:818)
W/System.err(13007): Caused by: java.lang.RuntimeException: Exception in Application start method
W/System.err(13007): at com.sun.javafx.application.LauncherImpl.launchApplication1(LauncherImpl.java:917)
W/System.err(13007): at com.sun.javafx.application.LauncherImpl.lambda$launchApplication$137(LauncherImpl.java:182)
W/System.err(13007): at com.sun.javafx.application.LauncherImpl.access$lambda$1(LauncherImpl.java)
W/System.err(13007): at com.sun.javafx.application.LauncherImpl$$Lambda$2.run(Unknown Source)
W/System.err(13007): ... 1 more
W/System.err(13007): Caused by: java.lang.NoClassDefFoundError: Failed resolution of: Ljavax/xml/bind/JAXBContext;
W/System.err(13007): at com.stm_wu_labor.STM_WU_LABOR.saveConfig(STM_WU_LABOR.java:161)
W/System.err(13007): at com.stm_wu_labor.STM_WU_LABOR.start(STM_WU_LABOR.java:65)
W/System.err(13007): at com.sun.javafx.application.LauncherImpl.lambda$launchApplication1$144(LauncherImpl.java:863)
W/System.err(13007): at com.sun.javafx.application.LauncherImpl.access$lambda$8(LauncherImpl.java)
W/System.err(13007): at com.sun.javafx.application.LauncherImpl$$Lambda$9.run(Unknown Source)
W/System.err(13007): at com.sun.javafx.application.PlatformImpl.lambda$runAndWait$157(PlatformImpl.java:326)
W/System.err(13007): at com.sun.javafx.application.PlatformImpl.access$lambda$6(PlatformImpl.java)
W/System.err(13007): at com.sun.javafx.application.PlatformImpl$$Lambda$7.run(Unknown Source)
W/System.err(13007): at com.sun.javafx.application.PlatformImpl.lambda$null$155(PlatformImpl.java:295)
W/System.err(13007): at com.sun.javafx.application.PlatformImpl.access$lambda$18(PlatformImpl.java)
W/System.err(13007): at com.sun.javafx.application.PlatformImpl$$Lambda$19.run(Unknown Source)
W/System.err(13007): at java.security.AccessController.doPrivileged(AccessController.java:52)
W/System.err(13007): at com.sun.javafx.application.PlatformImpl.lambda$runLater$156(PlatformImpl.java:294)
W/System.err(13007): at com.sun.javafx.application.PlatformImpl.access$lambda$5(PlatformImpl.java)
W/System.err(13007): at com.sun.javafx.application.PlatformImpl$$Lambda$6.run(Unknown Source)
W/System.err(13007): at com.sun.glass.ui.monocle.RunnableProcessor.runLoop(RunnableProcessor.java:92)
W/System.err(13007): at com.sun.glass.ui.monocle.RunnableProcessor.run(RunnableProcessor.java:51)
W/System.err(13007): ... 1 more
W/System.err(13007): Caused by: java.lang.ClassNotFoundException: Didn't find class "javax.xml.bind.JAXBContext" on path: DexPathList[[zip file "/data/app/com.stm_wu_labor-2/base.apk"],nativeLibraryDirectories=[/data/app/com.stm_wu_labor-2/lib/arm, /vendor/lib, /system/lib]]
W/System.err(13007): at dalvik.system.BaseDexClassLoader.findClass(BaseDexClassLoader.java:56)
W/System.err(13007): at java.lang.ClassLoader.loadClass(ClassLoader.java:511)
W/System.err(13007): at java.lang.ClassLoader.loadClass(ClassLoader.java:469)
W/System.err(13007): ... 18 more
W/System.err(13007): Suppressed: java.lang.ClassNotFoundException: javax.xml.bind.JAXBContext
W/System.err(13007): at java.lang.Class.classForName(Native Method)
W/System.err(13007): at java.lang.BootClassLoader.findClass(ClassLoader.java:781)
W/System.err(13007): at java.lang.BootClassLoader.loadClass(ClassLoader.java:841)
W/System.err(13007): at java.lang.ClassLoader.loadClass(ClassLoader.java:504)
W/System.err(13007): ... 19 more
W/System.err(13007): Caused by: java.lang.NoClassDefFoundError: Class not found using the boot class loader; no stack available
回答1:
When porting Java/JavaFX projects that work fine on Desktop to Android/iOS, and that make use of third party dependencies, you should be aware that not all those dependencies can be exported.
For instance, in terms of MySQL, it could be more convenient use SQLite. Check this post about using different SQLite libraries depending on the platform.
In the case of XML, it could be the same case. This question already mentions the drawback of using JAXB on Android, and proposes some alternatives.
Using Gluon Charm Down open source library (check this to add it to the build script) you can easily manage a local properties file in any platform, using the SettingService, that allows storing and retrieving properties:
SettingService settings = PlatformFactory.getPlatform().getSettingService();
settings.store("Info.Age", 10);
...
if (settings.retrieve("Info.Age") != null) {
int age = Integer.parseInt(settings.retrieve("Info.Age"));
}
Finally, whenever you find any problem with your application on Android, use debugging with adb, to find out the possible exceptions.
adb is located under the Android sdk folder, sdk/platform-tools/.
Connect your mobile device to the USB port, and on command line, type:
./adb logcat -v threadtime
Launch the application, and find out the relevant parts of the messages in the console, possible exceptions or logging messages (using System.out.println or System.err.println).
来源：https://stackoverflow.com/questions/34382211/javafx-gluon-save-xml-file