Question

I m programming in j2me. How can I prevent screen rotation in j2me for all phones that support screen rotation?

谢谢

Answer 1

添加到显示列表

For Nokia devices: Nokia-MIDlet-App-Orientation : Landscape

For Samsung devices: MIDlet-ScreenMode : Landscape

Answer 2

If you use Canvas to draw your screen (not LCDUI, not LWUIT, not any other framework) you may implement sizeChanged method to be notified when the rotation happens.

在此情况下, 您可以将屏幕拖到图像中, 并使用 Sprite 旋转它。例如, 只支持在构建器中使用的下面代码的景观模式 :


    int width = Math.max(super.getWidth(), super.getHeight());
    int height = Math.min(super.getWidth(), super.getHeight());
    // screen and sprite are attributes
    screen = Image.createImage(width, height);
    sprite = new Sprite(screen);
    if (super.getWidth() < super.getHeight()) { // portrait screen
        sprite.setTransform(Sprite.TRANS_ROT90);
        sprite.setPosition(0, 0);
    }

以及以下方法:


    public void sizeChanged (int w, int h) {
        // lastWidth and lastHeight are attributes
        lastWidth = w;
        lastHeight = h;
        if (sprite == null)  return;
        if (super.getWidth() < super.getHeight()) { // portrait screen
            sprite.setTransform(Sprite.TRANS_ROT90);
        } else {
            sprite.setTransform(Sprite.TRANS_NONE);
        }
        sprite.setPosition(0, 0);
    }

    protected void paint(Graphics g1) {
        if (super.getWidth() != lastWidth
            || super.getHeight() != lastHeight) {
            sizeChanged(super.getWidth(), super.getHeight());
        }
        Graphics g = screen.getGraphics();
        // ... do your drawing on g
        this.sprite.setImage(screen, screen.getWidth(), screen.getHeight());
        sprite.paint(g1);
    }

见和时间：2012-05-25 11:50:02

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