Question

我想创建后台应用程序，它将监听启动的应用程序以及移动到前台的内容。

请回复如果问题不明确将再次解释。

由于

Answer 1

这是你可以做的：

使用ApplicationManager.getForegroundProcessId()
使用ApplicationManager.getVisibleApplications()获取所有正在运行的应用
使用ApplicationManager.getProcessId()按流程ID

在TimerTask中定义了一段时间

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);
    }
}
}

黑莓 - 后台应用程序监听启动和前台应用程序

1 个答案: