Question

我的应用程序使用gcm模块监听通知并显示每个新通知的Android通知。此外，当前窗口将使用新的未读消息计数进行更新。

此窗口使用Ti.UI.createWindow({exitOnClose:true})

创建

问题是，当用户按下后退按钮时，应用程序停止。这意味着，我不再收到任何通知，因此无法在通知栏中显示它们。

有没有办法让钛在按下后退按钮时隐藏应用程序，但不能阻止它，以便我的代码stil在后台运行？

我知道启动服务的可能性，但其缺点是我无法更新我的窗口，当用户当前可以看到它时，因为似乎无法在服务和应用程序之间进行通信。或者有办法吗？

app.js

//this is the most important line in this code.
//if I do exitOnClose:true, I stop receiving notifications every 5 seconds when pressing the back button (not good!, I want to keep getting notifications)
//if I do exitOnClose:false, I go back to a blank, "powered by titanium" window, when pressing the back button (not good!, I want the app to go to the background)
var win = Ti.UI.createWindow({exitOnClose:true});


//not part of the question
var label = Ti.UI.createLabel({text:"0"});
win.add(label);
win.open();
var notifications = [];

//listen for notifications (not part of the question)
listenForNotifications(function(notification){

    //handle the notification
    notifications.push(notification);

    //update window
    label.text = "Notification Count: "+notifications.length;

    //display notification in title bar
    displayNotificationInTitleBar(notification);
})

//this function is just dummy code to simulate listening for notifications in background using the gcm module
//it simulates a new notification every 5 seconds with an always increasing id
//it actually does not matter what module I use for notifications, Just take it as given that there runs code in the background,
//that I don't want to stop, after the user taps the backbutton
function listenForNotifications(cb){
    var i = 0;
    setInterval(function(){
        cb({id:i++});
    },5000);
}

//This function is actually not part of the question, it's just a sample
function displayNotificationInTitleBar(notification){
    var intent = Ti.Android.createIntent({
        action: Ti.Android.ACTION_MAIN,
        packageName:"com.company.backgroundnotificationstest",
        className:"com.company.backgroundnotificationstest.BackgroundnotificationstestActivity",
        flags:Ti.Android.FLAG_ACTIVITY_RESET_TASK_IF_NEEDED  | Ti.Android.FLAG_ACTIVITY_SINGLE_TOP
    });
    intent.addCategory(Ti.Android.CATEGORY_LAUNCHER);
    intent.putExtra("notificationid",notification.id);

    Titanium.Android.NotificationManager.notify(notification.id, Titanium.Android.createNotification({
        contentTitle: "New Notification",
        contentText : "ID: "+notification.id,
        contentIntent: Ti.Android.createPendingIntent({
            intent:intent,
            type : Ti.Android.PENDING_INTENT_FOR_ACTIVITY
        }),
        flags : Titanium.Android.ACTION_DEFAULT | Titanium.Android.FLAG_AUTO_CANCEL | Titanium.Android.FLAG_SHOW_LIGHTS
    }));
}

示例应用程序位于：https://github.com/VanCoding/TitaniumBackgroundNotificationsTest

随意编译并自己查看：）

Answer 1

由于您设置exitOnClose，您的应用将在关闭您创建的窗口时退出。要防止退出应用程序，您需要在创建窗口时按如下方式重置密钥。

Ti.UI.createWindow({exitOnClose: false});

如果您想在通知栏中显示通知，请确保已设置以下键

showTrayNotification
showTrayNotificationsWhenFocused：即使关注应用，这也会在托盘中显示通知。

要显示/隐藏徽章，您可以尝试以下提示。

您需要跟踪收到的通知数量，并在收到通知后进行更新。只需使用存储的值更新徽章即可。我尝试了这个解决方案，并且在我的应用程序中运行良好

Answer 2

经过一番思考，我得出了以下（有点hacky）解决方案：

win.addEventListener("android:back",function(){ //listen for the back-button-tap event

    e.cancelBubble = true;  //prevent the back-button default action


    //display the home screen
    var intent = Ti.Android.createIntent({
        action: Ti.Android.ACTION_MAIN,
        flags:Ti.Android.FLAG_ACTIVITY_NEW_TASK
    });
    intent.addCategory(Ti.Android.CATEGORY_HOME);
    Ti.Android.currentActivity.startActivity(intent);

});

Titanium - 阻止exitOnClose停止应用程序

2 个答案: