IDE: - Eclipse 桌面Windows 7 模拟器Nexus 5 设备
嘿伙计们。我想打开设备的图库并显示用户选择的图像。我创建一个按钮,ActionListener应该将我转移到设备的库中。但即使我省略了画廊部分的开口并且只是添加按钮,模拟器也会显示一个空白屏幕。此外,它在日志中提供以下异常: -Jul 20, 2017 4:11:00 PM java.util.prefs.WindowsPreferences <init>
WARNING: Could not open/create prefs root node Software\JavaSoft\Prefs at root 0x80000002. Windows RegCreateKeyEx(...) returned error code 5.
java.io.UTFDataFormatException: malformed input around byte 64
at java.io.DataInputStream.readUTF(Unknown Source)
at java.io.DataInputStream.readUTF(Unknown Source)
at com.codename1.ui.util.Resources.loadTheme(Resources.java:1270)
at com.codename1.ui.util.Resources.openFileImpl(Resources.java:303)
at com.codename1.ui.util.Resources.openFile(Resources.java:269)
at com.codename1.ui.util.Resources.<init>(Resources.java:189)
at com.codename1.ui.util.Resources.open(Resources.java:768)
at com.codename1.ui.util.Resources.open(Resources.java:688)
at com.codename1.impl.javase.JavaSEPort$4.run(JavaSEPort.java:1720)
at com.codename1.ui.Display.processSerialCalls(Display.java:1056)
at com.codename1.ui.Display.mainEDTLoop(Display.java:873)
at com.codename1.ui.RunnableWrapper.run(RunnableWrapper.java:120)
at com.codename1.impl.CodenameOneThread.run(CodenameOneThread.java:176)
以下是我在空的新裸骨项目上制作的主要java文件: -
package com.mycompany.myapp;
import com.codename1.ui.Display;
import com.codename1.ui.Form;
import com.codename1.ui.Image;
import com.codename1.ui.Button;
import com.codename1.ui.Dialog;
import com.codename1.ui.Label;
import com.codename1.ui.plaf.UIManager;
import com.codename1.ui.util.Resources;
import com.codename1.components.ImageViewer;
import com.codename1.io.Log;
import com.codename1.media.MediaManager;
import com.codename1.ui.Toolbar;
import com.codename1.ui.events.ActionEvent;
import com.codename1.ui.events.ActionListener;
import java.io.IOException;
/**
* This file was generated by <a href="https://www.codenameone.com/">Codename One</a> for the purpose
* of building native mobile applications using Java.
*/
public class MyApplication {
private Form current;
private Resources theme;
public void init(Object context) {
theme = UIManager.initFirstTheme("/theme");
// Enable Toolbar on all Forms by default
Toolbar.setGlobalToolbar(true);
// Pro only feature, uncomment if you have a pro subscription
// Log.bindCrashProtection(true);
}
public void start() {
if(current != null){
current.show();
return;
}
Form hi = new Form("Hi World");
hi.addComponent(new Label("Hi World"));
Button gallery = new Button("Browse");
hi.add(gallery);
gallery.addActionListener(new ActionListener<ActionEvent>() {
@Override
public void actionPerformed(ActionEvent evt) {
// TODO Auto-generated method stub
Display.getInstance().openGallery((e) -> {
if(e != null && e.getSource() != null) {
// String file = (String)e.getSource();
// try {
// Label path = new Label(file);
// hi.add(path);
//
// } catch(Exception err) {
// Log.e(err);
// }
}
}, Display.GALLERY_IMAGE);
}
});
}
public void stop() {
current = Display.getInstance().getCurrent();
if(current instanceof Dialog) {
((Dialog)current).dispose();
current = Display.getInstance().getCurrent();
}
}
public void destroy() {
}
}
答案 0 :(得分:2)
看来你有几个问题。第一个是您应该使用JDK安装修复的首选项问题:
解决问题解决方法是以管理员身份登录 并创建密钥HKEY_LOCAL_MACHINE \ Software \ JavaSoft \ Prefs
来自Java: java.util.Preferences Failing
接下来,您的资源文件似乎已损坏。很难分辨出那里出了什么问题......它的长度是0吗?
查看this article以了解设计师工具问题。
来自相机的大图像需要一些时间来处理某些设备。您可以捕获较小的图像(请参阅各种捕获方法),但我猜测您在添加到ui之后没有重新验证,并且错误地认为这很慢。