黑莓 - 后台应用程序监听启动和前台应用程序

Question

我想创建后台应用程序,它将监听启动的应用程序和移动到前台的内容.

请回复如果问题不明确将再次解释.

谢谢

Answer 1

这是你可以做的:

• 使用ApplicationManager.getForegroundProcessId()
• 使用ApplicationManager.getVisibleApplications()来获取所有正在运行的应用程序
• 使用ApplicationManager.getProcessId()按进程ID搜索app

• 在TimerTask中以定义的周期执行此操作

  public class AppListenerApp extends Application {
  int mForegroundProcessId = -1;
  
  public AppListenerApp() {
      Timer timer = new Timer();
      timer.schedule(mCheckForeground, 2000, 2000);                       
  }
  
  public static void main(String[] args) {
      AppListenerApp app = new AppListenerApp();
      app.enterEventDispatcher();
  }
  
  TimerTask mCheckForeground = new TimerTask() {
      public void run() {
          int id = getForegroungProcessID();
          if(id != mForegroundProcessId)
          {
              mForegroundProcessId = id;
              String name = 
                  getAppNameByProcessId(mForegroundProcessId);
              showMessage(name);
          }
      };
  };
  
  private int getForegroungProcessID() {
      return ApplicationManager.getApplicationManager()
              .getForegroundProcessId();
  }
  
  private String getAppNameByProcessId(int id) {
      String result = null;
      ApplicationManager appMan = 
                  ApplicationManager.getApplicationManager();
      ApplicationDescriptor appDes[] = 
                  appMan.getVisibleApplications();
      for (int i = 0; i < appDes.length; i++) {
          if (appMan.getProcessId(appDes[i]) == id) {
              result = appDes[i].getName();
              break;
          }
      }
      return result;
  }
  
  private void showMessage(String message) {
      synchronized (Application.getEventLock()) {
          Dialog dlg = new Dialog(Dialog.D_OK, message, 
                          Dialog.OK, null, Manager.FIELD_HCENTER);
          Ui.getUiEngine()
                          .pushGlobalScreen(dlg, 1, UiEngine.GLOBAL_QUEUE);
      }
  }
  }