我正在创建一个自定义字段来制作图像按钮。图像绘制为一个框,w和h相等,但图像的高度几乎是宽度的两倍。我运行了调试器,正确的w,h被放入g.drawBitmap(0, 0, w, h, image, 0, 0)
。你是解决这个问题的方法吗?
public class cPictureButton extends Field{
private Bitmap image;
public cPictureButton( Bitmap image, long style)
{
super(style);
this.image=image;
}
public int getPreferredHeight()
{
return image.getHeight();
// return getFont().getHeight();
}
public int getPreferredWidth()
{
return image.getWidth();
// return getFont().getAdvance(label)+8;
}
protected void drawFocus(Graphics g, boolean on)
{
}
protected void paint(Graphics g)
{
int w=image.getWidth();
int h=image.getHeight();
g.drawBitmap(0, 0, w, h, image, 0, 0);
if (isFocus() )
g.drawRect(0,0,image.getWidth(), image.getHeight());
}
protected void layout(int width, int height) {
setExtent(Math.min(width, getPreferredWidth()),
Math.min(height, getPreferredWidth()));
}
public boolean isFocusable() {
return true;
}
protected boolean navigationClick(int status, int time)
{
fieldChangeNotify(0);
return true;
}
}
答案 0 :(得分:2)
复制和粘贴可能是你进去的.setExtent的第二个参数应该调用getPreferredHeight():
setExtent(Math.min(width, getPreferredWidth()),
Math.min(height, getPreferredWidth()))