Blackberry - 如何获取后台应用程序进程ID

Question

在我的黑莓模拟器我在后台运行两个应用程序现在我想要检索哪些是在后台运行的应用程序.我不怎么做.是否可以显示在后台运行的应用程序.

Answer 1

列出并切换可见应用程序

• 要列出所有可见的应用程序,请使用ApplicationManager.getVisibleApplications()
• 为了使一些应用程序前台使用ApplicationManager.requestForeground(processId)

alt text http://img195.imageshack.us/img195/7003/applist.png 链接文本http://img32.imageshack.us/img32/9273/applistmenu.png

码:

class Scr extends MainScreen {

    ApplicationDescriptor[] mAppDes;

    public Scr() {
        listApplications();
    }

    void listApplications() {
        ApplicationManager appMan = 
            ApplicationManager.getApplicationManager();
        mAppDes = appMan.getVisibleApplications();
        add(new LabelField("Visible Applications:"));
        for (int i = 0; i < mAppDes.length; i++) {
            boolean isFG = appMan.getProcessId(mAppDes[i]) == appMan
                    .getForegroundProcessId();
            String text = (isFG ? "[F]:" : "[B]") + mAppDes[i].getName();
            add(new LabelField(text));
        }
    }

    protected void makeMenu(Menu menu, int instance) {
        super.makeMenu(menu, instance);
        menu.add(refreshApps);
        makeAppMenuItems(menu);
    }

    MenuItem refreshApps = new MenuItem("Refresh", 0, 0) {
        public void run() {
            deleteAll();
            listApplications();
        }
    };

    class AppMenuItem extends MenuItem {
        ApplicationDescriptor mAppDes;
        public AppMenuItem(ApplicationDescriptor appDes) {
            super(appDes.getName(), 100000, 100000);
            mAppDes = appDes;
        }
        public void run() {
            ApplicationManager appMan = ApplicationManager
                    .getApplicationManager();
            int processId = appMan.getProcessId(mAppDes);
            appMan.requestForeground(processId);
        }
    }

    void makeAppMenuItems(Menu menu) {
        for (int i = 0, cnt = mAppDes.length; i < cnt; i++)
            menu.add(new AppMenuItem(mAppDes[i]));
    }
}