Java me 为什么pointerPressed方法在这种情况下不起作用?
我创建了一个扩展CustomItem的java类:Java me 为什么pointerPressed方法在这种情况下不起作用?,java-me,lwuit,alcatel-ot,Java Me,Lwuit,Alcatel Ot,我创建了一个扩展CustomItem的java类: package view; import com.sun.lwuit.Dialog; import javax.microedition.lcdui.CustomItem; import javax.microedition.lcdui.Graphics; import javax.microedition.lcdui.Image; public class Thumb extends CustomItem { private Im
package view;
import com.sun.lwuit.Dialog;
import javax.microedition.lcdui.CustomItem;
import javax.microedition.lcdui.Graphics;
import javax.microedition.lcdui.Image;
public class Thumb extends CustomItem {
private Image theImage;
public Thumb(Image photo)
{
super("");
theImage = photo;
}
private Image createThumbnail(Image image) {
int sourceWidth = image.getWidth();
int sourceHeight = image.getHeight();
int thumbWidth = 64;
int thumbHeight = -1;
if (thumbHeight == -1) {
thumbHeight = thumbWidth * sourceHeight / sourceWidth;
}
Image thumb = Image.createImage(thumbWidth, thumbHeight);
Graphics g = thumb.getGraphics();
for (int y = 0; y < thumbHeight; y++) {
for (int x = 0; x < thumbWidth; x++) {
g.setClip(x, y, 1, 1);
int dx = x * sourceWidth / thumbWidth;
int dy = y * sourceHeight / thumbHeight;
g.drawImage(image, x - dx, y - dy, Graphics.LEFT | Graphics.TOP);
}
}
Image immutableThumb = Image.createImage(thumb);
return immutableThumb;
}
protected int getMinContentHeight() {
return 64 * theImage.getHeight() / theImage.getWidth();
}
protected int getMinContentWidth() {
return 64;
}
protected int getPrefContentHeight(int width) {
return 64 * theImage.getHeight() / theImage.getWidth();
}
protected int getPrefContentWidth(int height) {
return 64;
}
protected void paint(Graphics g, int w, int h) {
Image transformImage = createThumbnail(theImage);
g.drawImage(transformImage, 0, 0, Graphics.TOP|Graphics.LEFT);
}
protected void pointerPressed(int x, int y)
{
Dialog.show("Info", "I clicked the screen !", "ok", null);
}
}
fcDir = (FileConnection) Connector.open("file:///"+pRoot+photoDirectory+"/");
if (fcDir.exists()) {
filelist = fcDir.list("*", false);
while (filelist.hasMoreElements()) {
fileName = (String) filelist.nextElement();
vPhotoNames.addElement(new String(fileName));
FileConnection fcFile = (FileConnection) Connector.open("file:///"+pRoot+photoDirectory+"/"+fileName);
// creation customitem
this.append(new Thumb(Image.createImage(fcFile.openInputStream())));
fcFile.close();
}
}
fcDir.close();
启动应用程序时,然后:
1) 不能通过箭头键(设备为阿尔卡特OT-806D)或触摸屏幕来移动光标。
2) 当我试图点击一个图像,然后什么也没有发生,虽然对话框应该出现
那么,为什么会出现这些问题呢?您正试图从MIDP CustomItem中显示LUIT对话框,该对话框不受官方支持,并且在许多创造性方面注定会失败。在任何给定时刻,您都需要使用LWIIT或LCDUI。我注意到,当我单击已获得焦点的图像时,光标无法移动。但是如果我不点击任何获得焦点的图像,焦点可以移动。