在Blackberry上启动带有进度指示器的屏幕

问题描述

| 我正在尝试设计一个带有活动指示器的初始屏幕。 我已成功创建了初始屏幕，但未将其添加到指示器中， 当我设置其布局时，它被隐藏在图像下方。 我怎样才能解决这个问题？ 这是我的代码：

package mypackage;
import java.util.Timer;
import java.util.TimerTask;

import net.rim.device.api.system.Application;
import net.rim.device.api.system.Bitmap;
import net.rim.device.api.system.display;
import net.rim.device.api.ui.Field;
import net.rim.device.api.ui.Graphics;
import net.rim.device.api.ui.UiApplication;
import net.rim.device.api.ui.component.progressindicator.ActivityIndicatorController;
import net.rim.device.api.ui.component.progressindicator.ActivityIndicatorModel;
import net.rim.device.api.ui.component.progressindicator.ActivityIndicatorView;
import net.rim.device.api.ui.container.HorizontalFieldManager;
import net.rim.device.api.ui.container.VerticalFieldManager;

import net.rim.device.api.ui.container.MainScreen;
//import net.rim.device.api.ui.extension.container.EyelidFieldManager;


public final class SplashScreen extends SplashScreenPage
{


    public SplashScreen()
    {        
     super(Bitmap.getBitmapResource(\"splash-blackBerry.png\"),2);
    }
}
class SplashScreenPage extends MainScreen

{   

    VerticalFieldManager vfm= new VerticalFieldManager(Field.FIELD_VCENTER);


HorizontalFieldManager hfm = new HorizontalFieldManager(Field.FIELD_VCENTER)
    {
        protected void sublayout( int maxWidth,int maxHeight )
     {
        super.sublayout(360,60);
        setExtent(360,60);

       Field field = getField(0);
       layoutChild(field,140,60);
       setPositionChild(field,100,200);
 }



    public void paint(Graphics graphics)
     {
         //Draw the background image and then call paint.

     // super.paint(graphics);
      //graphics.clear();

         // graphics.setBackgroundColor(0x000000);
          //graphics.drawBitmap(0,360,480,popup,0);

             // super.paint(graphics);
             // graphics.clear();       
         // graphics.drawBitmap(0,0);


    }               

    };





    ActivityIndicatorView view = new ActivityIndicatorView(Field.USE_ALL_WIDTH);
    ActivityIndicatorModel model = new ActivityIndicatorModel();
    ActivityIndicatorController controller = new ActivityIndicatorController();






    boolean notlogged = false;
    Bitmap popup;
    SplashScreenPage screen1 = this;
    private Timer splashTimer = new Timer();
    private TimerTask splashTask;
    int count = 0;
    int screenWidth = display.getWidth();
    int screenHeight = display.getHeight();
    int yCoord;
    int xCoord;
    boolean showSplash = true;
    boolean splashdisplayed = false;
    //SplashScreen page is here
    public SplashScreenPage(Bitmap popup,final int seconds) 
    {

        view.setController(controller);
        view.setModel(model);
        view.setLabel(\"Loading\");
        controller.setModel(model);
        controller.setView(view);

        model.setController(controller);        

        Bitmap bitmap = Bitmap.getBitmapResource(\"images.jpeg\");
        view.createActivityImageField(bitmap,5,Field.FIELD_BottOM);

      //  add(view);

   add(hfm);
    hfm.add(view);
  // add(vfm);
   // vfm.add(Bitmap.getBitmapResource(\"splash-blackBerry.png\"));






          this.popup = popup;
          xCoord = (screenWidth - popup.getWidth()) / 2;
           yCoord = (screenHeight - popup.getHeight()) / 2;

            splashTask = new TimerTask() {

            public void run() {

                if (showSplash && !splashdisplayed) {
                    count++;
                    if (count == seconds * 15) {
                        showSplash = false;
                        splashdisplayed = true;
                        splashTimer.cancel();
                        invalidate();


                        synchronized (Application.getEventLock()){

                             UiApplication.getUiApplication().pushScreen(new secondscreen());
                              notlogged = true;
                             }

                       }
                }
            }
        };

       splashTimer.scheduleAtFixedrate(splashTask,100);

    }

    protected void paint(Graphics graphics) {
        super.paint(graphics);
        if (showSplash && !splashdisplayed) {
            graphics.drawBitmap(xCoord,yCoord,popup.getWidth(),popup.getHeight(),0);
           // super.paint(graphics);
           // graphics.clear();
        }
    }

    protected void onUiEngineAttached(boolean attached) {
        showSplash = true;
        invalidate();
        super.onUiEngineAttached(attached);
    }


    protected boolean navigationMovement(int dx,int dy,int status,int time) {
        return dismisssplash();
    }

    protected boolean navigationClick(int status,int time) {
        return dismisssplash();
    }

        protected boolean keyChar(char c,int time) {
        return dismisssplash();
    }

    private boolean dismisssplash() {
        if (showSplash) {
            showSplash = false;
            splashdisplayed = true;
            invalidate();
            return true;
        }else{
            return false;
        }
    }

    public void onExposed() {
           if( notlogged)
           UiApplication.getUiApplication().popScreen(this);
        }
}

    

解决方法

在要向其中添加视图的Horizo​​ntalFieldManager中，需要确保正在调用super.paint（），因为它调用了subpaint（），它将告诉其子Field（在这种情况下为view）进行绘制。我看到您已将其注释掉，所以您可能一直对此感到困惑。另外，请确保在调用super.paint（）之前先进行背景绘画，以免您用自己的绘画掩盖ActivityIndi​​catorView。 您是否有可能仔细检查并清理代码（删除不重要的注释掉的代码），使其达到预期的效果，因此区分“尝试任何操作”要容易一些您可以\“代码和\”工作\“代码。