Question

我在水平方向安排了7个bimapfield如果我点击它想要推送另一个屏幕的位图这里是我的代码但我没有得到另一个屏幕可以任何人帮我这个代码中有什么错误

BitmapField bitmap1 = new BitmapField(
    Bitmap.getBitmapResource("profile_n.png"),FOCUSABLE | DrawStyle.HCENTER)
{
    protected void onFocus(int direction)
    {
        rollno=1;
        this.getScreen().invalidate();
    }
    protected void onUnfocus()
    {

    }   
    protected boolean navigationClick(int status, int time){
           UiApplication.getUiApplication().popScreen(getScreen());
            UiApplication.getUiApplication().pushScreen(new AccMainScreen());
        return true;
    }
};

Answer 1

您可以使用包含图像的自定义字段，其行为类似于按钮而不是位图字段。这是我建议的代码：

import net.rim.device.api.system.Bitmap;
import net.rim.device.api.ui.Field;
import net.rim.device.api.ui.Graphics;
public class CustomButton extends Field{

    protected Bitmap icon;
    protected int fieldWidth;
    protected int fieldHeight;

    public CustomButton (String iconSource,long style) {
        super(style);
        icon = Bitmap.getBitmapResource(iconSource);
        fieldHeight = icon.getHeight();
        fieldWidth = icon.getWidth();
    }

    public int getPreferredWidth() {
        return fieldWidth;
    }

    public int getPreferredHeight() {
        return fieldHeight;
    }
    protected void layout(int arg0, int arg1) {
        setExtent(getPreferredWidth(), getPreferredHeight());
    }
    protected void drawFocus(Graphics graphics, boolean on){ }

    protected void paint(Graphics graphics) {
        graphics.fillRect(0, 0, fieldWidth, fieldHeight);
        graphics.drawBitmap(0,0, fieldWidth, fieldHeight, icon, 0, 0);
    }
    protected boolean navigationClick(int status, int time) {
        fieldChangeNotify(0);
        return true;
    }
}

您可以像使用默认按钮一样使用此按钮，并使用setChangeListener函数更改其监听器。

CustomButton aButton = new CustomButton ("graphics/someIcon.png");
aButton.setChangeListener(new FieldChangeListener() {
    public void fieldChanged(Field field, int context) {
        UiApplication.getUiApplication().popScreen(getScreen());
        UiApplication.getUiApplication().pushScreen(new AccMainScreen());   
    }
});

BitmapField单击不适用于Blackberry应用程序

1 个答案: