blackberry：如果将另一个字段绘制为相同的x坐标，则获取字段焦点时出现问题

我有一个AbsoluteFieldManager，它在一个水平行中包含多个字段，切换焦点效果很好。现在我需要在与上面的左字段相同的水平位置添加另一个字段。这样做时，我无法再聚焦第一个字段。屏幕应如下所示：

________________________
|  ____   ____   ____  |
| |_f1_| |_f2_| |_f3_| |
|  ____                |
| |_f4_|               | with f4 added here, f1 isn't focusable, once it has
|______________________| lost focus.

如果你有办法解决这个问题，我会很感激的。以下是我目前的代码：

测试屏幕：

import net.rim.device.api.system.Display;
import net.rim.device.api.ui.container.AbsoluteFieldManager;
import net.rim.device.api.ui.container.MainScreen;

public class TestScreen extends MainScreen {
    int screenY = Display.getWidth();
    int screenX = Display.getHeight();

    public TestScreen() {
        AbsoluteFieldManager manager = new AbsoluteFieldManager();
        TestField f1 = new TestField(50, 50, true);
        TestField f2 = new TestField(50, 50, true);
        TestField f3 = new TestField(50, 50, true);
        TestField f4 = new TestField(50, 50, true);
        TestField f5 = new TestField(50, 50, false);
        manager.add(f1, 0, 0);
        manager.add(f2, 60, 0);
        manager.add(f3, 120, 0);
        manager.add(f4, 180, 0);
        // this works fine: 
        // manager.add(f5, 1, 80);
        // this not:
        manager.add(f5, 0, 80);
        add(manager);
    }
}

测试字段：

import net.rim.device.api.ui.Field;
import net.rim.device.api.ui.Graphics;


public class TestField extends Field {
    boolean isFocusable;
    int width, height;
    int bgColorUnfocused, bgColorFocused;
    public TestField(int width, int height, boolean isFocusable){
        this.width=width;
        this.height=height;
        this.isFocusable=isFocusable;
        bgColorUnfocused= 0xC0C0C0;
        bgColorFocused = 0x3956F7;
    }
    protected void layout(int w, int h) {
        setExtent(width, height);
    }
    public boolean isFocusable() {
        return isFocusable;
    }
    protected void paint(Graphics g) {
        g.setColor(isFocus() ? bgColorFocused : bgColorUnfocused);
        g.fillRect(0, 0, width, height);        
    }

}

TestApp：

import net.rim.device.api.ui.UiApplication;


public class TestApp extends UiApplication{
    TestScreen screen = new TestScreen();
    public static void main(String args[]){
        TestApp app = new TestApp();
        app.enterEventDispatcher();
    }
    public TestApp(){
        pushScreen(screen);
    }
}

---

由于AbsoluteFieldManager不确定您将项目放置在何处，因此它不知道在使用滚轮时发送焦点的顺序。如果您想管理此操作，请使用AFM的ovveride

nextFocus（int，int）

，以便您可以根据焦点的位置和预期移动的位置指定谁获得焦点

更多详情，请参阅）