User interface 如何开发多屏幕黑莓应用程序?
我需要开发一个应用程序,我能够改变屏幕使用菜单项上一个和下一个。你能给我一个关于如何实施它的大致想法吗 谢谢User interface 如何开发多屏幕黑莓应用程序?,user-interface,blackberry,navigation,User Interface,Blackberry,Navigation,我需要开发一个应用程序,我能够改变屏幕使用菜单项上一个和下一个。你能给我一个关于如何实施它的大致想法吗 谢谢 使用此功能可显示另一个屏幕您可以将其实现为一个屏幕阵列,并将其按圆周方向推送。但在推新屏幕之前,不要忘记拉当前屏幕 它的应用程序将处理屏幕切换,也将处理屏幕阵列。但是菜单是放在屏幕上的,所以我们必须在屏幕和应用程序类之间进行一些通信 让我们使用一些侦听器切换屏幕: interface IBarrelListener { public void goPreviouse();
使用此功能可显示另一个屏幕您可以将其实现为一个屏幕阵列,并将其按圆周方向推送。但在推新屏幕之前,不要忘记拉当前屏幕 它的应用程序将处理屏幕切换,也将处理屏幕阵列。但是菜单是放在屏幕上的,所以我们必须在屏幕和应用程序类之间进行一些通信 让我们使用一些侦听器切换屏幕:
interface IBarrelListener {
public void goPreviouse();
public void goNext();
}
现在,我们可以使用此侦听器和相应的菜单实现屏幕:
class ABarrelScreen extends MainScreen {
IBarrelListener mBarrelListener;
public ABarrelScreen(IBarrelListener barrelListener) {
super();
mBarrelListener = barrelListener;
}
protected void makeMenu(Menu menu, int instance) {
super.makeMenu(menu, instance);
menu.add(goPreviouseMenuItem);
menu.add(goNextMenuItem);
}
MenuItem goPreviouseMenuItem = new MenuItem("go previouse", 0, 0) {
public void run() {
mBarrelListener.goPreviouse();
};
};
MenuItem goNextMenuItem = new MenuItem("go next", 0, 0) {
public void run() {
mBarrelListener.goNext();
};
};
}
和应用程序类本身:
public class ScrCircleApp extends UiApplication implements IBarrelListener {
ABarrelScreen[] mScreens = generateScreens();
int mCurrentScreen = 0;
public ScrCircleApp() {
pushScreen(mScreens[mCurrentScreen]);
}
public static void main(String[] args) {
ScrCircleApp app = new ScrCircleApp();
app.enterEventDispatcher();
}
private ABarrelScreen[] generateScreens() {
ABarrelScreen[] screens = new ABarrelScreen[6];
for (int i = 0; i < screens.length; i++) {
screens[i] = new ABarrelScreen(this);
screens[i].add(new LabelField("This is screen # "
+ String.valueOf(i)));
}
return screens;
}
public void goNext() {
popScreen(mScreens[mCurrentScreen]);
mCurrentScreen++;
if (mCurrentScreen >= mScreens.length)
mCurrentScreen = 0;
pushScreen(mScreens[mCurrentScreen]);
}
public void goPreviouse() {
popScreen(mScreens[mCurrentScreen]);
mCurrentScreen--;
if (mCurrentScreen < 0)
mCurrentScreen = mScreens.length - 1;
pushScreen(mScreens[mCurrentScreen]);
}
}
公共类SCRCCLEAPP扩展应用程序实现IBarrelListener{
ABarrelScreen[]mScreens=generateScreens();
int mCurrentScreen=0;
公共SCRCLEAPP(){
推屏(mScreens[mCurrentScreen]);
}
公共静态void main(字符串[]args){
SCRCCLEAPP app=新的SCRCCLEAPP();
app.enterEventDispatcher();
}
专用ABarrelScreen[]生成屏幕(){
ABarrelScreen[]屏幕=新的ABarrelScreen[6];
对于(int i=0;i=mScreens.length)
mCurrentScreen=0;
推屏(mScreens[mCurrentScreen]);
}
公共无效{
popScreen(mScreens[McCurrentScreen]);
mCurrentScreen--;
如果(mCurrentScreen<0)
mCurrentScreen=mScreens.length-1;
推屏(mScreens[mCurrentScreen]);
}
}
这正是我所需要的,一切都在那里。每次你都会砰的一声。谢谢
public class ScrCircleApp extends UiApplication implements IBarrelListener {
ABarrelScreen[] mScreens = generateScreens();
int mCurrentScreen = 0;
public ScrCircleApp() {
pushScreen(mScreens[mCurrentScreen]);
}
public static void main(String[] args) {
ScrCircleApp app = new ScrCircleApp();
app.enterEventDispatcher();
}
private ABarrelScreen[] generateScreens() {
ABarrelScreen[] screens = new ABarrelScreen[6];
for (int i = 0; i < screens.length; i++) {
screens[i] = new ABarrelScreen(this);
screens[i].add(new LabelField("This is screen # "
+ String.valueOf(i)));
}
return screens;
}
public void goNext() {
popScreen(mScreens[mCurrentScreen]);
mCurrentScreen++;
if (mCurrentScreen >= mScreens.length)
mCurrentScreen = 0;
pushScreen(mScreens[mCurrentScreen]);
}
public void goPreviouse() {
popScreen(mScreens[mCurrentScreen]);
mCurrentScreen--;
if (mCurrentScreen < 0)
mCurrentScreen = mScreens.length - 1;
pushScreen(mScreens[mCurrentScreen]);
}
}