How can I implement such a dialog, no activity is running. Is the activity invisible or what?
How can I implement such a dialog, no activity is running.
You can't.
Is the activity invisible or what?
Possibly, perhaps using Theme.Translucent.NoTitleBar.
More likely, what you think is a Dialog is really a dialog-themed Activity. The main themes (e.g., Theme.Material, Theme.AppCompat) have specific themes with Dialog in their names that cause the activity's window to not fill the entire screen.
In your dialog you need to set type of Window which dialog attached, as follows:
dialog.getWindow().setType(WindowManager.LayoutParams.TYPE_SYSTEM_ALERT);
Do not forget declaring android.permission.SYSTEM_ALERT_WINDOW permission in your manifest.
Related
Since I read showing Alert Dialog on Service may damage on other program , I want to know is there difference between showing Alert Dialog directly like this:
AlertDialog alertDialog = builder.create();
alertDialog.getWindow().setType(WindowManager.LayoutParams.TYPE_SYSTEM_ALERT);
alertDialog.show();
And showing through specific activity?
I want something like communication application's popup (e.g. Line Messenger,..)
which of ways do you recommend?
You can start a Transparent activity from your service which shows the dialog within itself.
First create the "transparent" activity and set its theme like this in the Manifest
<activity android:name=".MyPopUpActivity" android:theme="#android:style/Theme.Translucent.NoTitleBar.Fullscreen"/>
Set the background of this activity to a transparent colour of your choice.
From your service, start this activity. Make sure to pass whatever data needed to show the Dialog.
Once the activity is launched, use a DialogFragment to show the dialog. Using DialogFragment is the recommended way to display dialogs in android.
I haven't tested this approach myself but I am pretty sure it will do the trick for you.
Let me know if it works for you
I want to show an Alert Dialog such that it stays on screen even if I go back to previous activity just after showing an alert dialog. Is is possible?
I tried using applicationContext but it does not work.
I don't think so, and I believe this would be a bad user experience. Perhaps you should re-think the design.
You cant do that , because a dialog is attached with a single window context , if window changes the dialog memory will be leaked and it will automatically close the dialog .You can make a same effect by showing the same dialog in both screens .However you will definitely see the transition of dialog with activity .
You can create an activity and give it a dialog theme. That way you dont have to worry about the context. It doesnt make a difference to the user also as it looks just like a dialog.
But I agree with AndyRes, It would be a bad user experience.
I have read really a lot of posts about this topic, however nothing works for me (or doesn't have the effect I wish).
I have a an application, that after logging in starts a background Service (implementation of the Service class). This service syncs itself with a Server and if a new order comes, it creates a notification.
So far, everything works great, I have the notification and the Toast message. However, I would like to have a dialog, that notifies the user about the new order.
As I understood, you can start an activity from within the service, which displays the dialog. This works, but the activity starts on top of the current activity stack and displays the dialog. I have an activity with no view attached and it correctly displays the dialog, however, on a black background.
What I want is to display the dialog on the current activity, causing the actual background(the running activity) to fade and display the dialog.
Is this somehow possible?
We can show dialog from service only if it is a system alert dialog. So, set TYPE_SYSTEM_ALERT window layout parameter to Dialog as follows:
dialog.getWindow().setType(WindowManager.LayoutParams.TYPE_SYSTEM_ALERT);
But, it needs SYSTEM_ALERT_WINDOW permission. So, don't forget to add this permissin in Manifest file.
<uses-permission android:name="android.permission.SYSTEM_ALERT_WINDOW"/>
Edit:
Better option to show dialog is to start activity as one of the below ways.
Start Activity with Dialog Theme (android:theme="#android:style/Theme.Dialog") -(or)
Start Translucent Activity and show Dialog in it.
Note: You should add Intent.FLAG_ACTIVITY_NEW_TASK to intent
I highly, highly, HIGHLY recommend that you DON'T do this (it goes against Android design and UI guidelines). Notifications are the preferred way to accomplish what you are doing (which it sounds as if you have already accomplished).
That being said, if you must do it, I would recommend just using a Dialog themed activity. That way you don't have to start up a separate dialog. Please see http://developer.android.com/guide/topics/ui/themes.html#ApplyATheme for how to do this.
you can start by learning on how to create an activity that looks like a dialog (no title bar, transparent background, "floating" effect, etc.)
and no, you can't just start a dialog without an activty
No, you can't hijack activity that is not "yours" and command it to show dialog.
Your approach of starting your own activity is the classic one.
You cannot show a dialog. But you can go the alernative way by inflating your customized view so that you can show a dialog on the screen whenver certain conditions are met.
I have read really a lot of posts about this topic, however nothing works for me (or doesn't have the effect I wish).
I have a an application, that after logging in starts a background Service (implementation of the Service class). This service syncs itself with a Server and if a new order comes, it creates a notification.
So far, everything works great, I have the notification and the Toast message. However, I would like to have a dialog, that notifies the user about the new order.
As I understood, you can start an activity from within the service, which displays the dialog. This works, but the activity starts on top of the current activity stack and displays the dialog. I have an activity with no view attached and it correctly displays the dialog, however, on a black background.
What I want is to display the dialog on the current activity, causing the actual background(the running activity) to fade and display the dialog.
Is this somehow possible?
We can show dialog from service only if it is a system alert dialog. So, set TYPE_SYSTEM_ALERT window layout parameter to Dialog as follows:
dialog.getWindow().setType(WindowManager.LayoutParams.TYPE_SYSTEM_ALERT);
But, it needs SYSTEM_ALERT_WINDOW permission. So, don't forget to add this permissin in Manifest file.
<uses-permission android:name="android.permission.SYSTEM_ALERT_WINDOW"/>
Edit:
Better option to show dialog is to start activity as one of the below ways.
Start Activity with Dialog Theme (android:theme="#android:style/Theme.Dialog") -(or)
Start Translucent Activity and show Dialog in it.
Note: You should add Intent.FLAG_ACTIVITY_NEW_TASK to intent
I highly, highly, HIGHLY recommend that you DON'T do this (it goes against Android design and UI guidelines). Notifications are the preferred way to accomplish what you are doing (which it sounds as if you have already accomplished).
That being said, if you must do it, I would recommend just using a Dialog themed activity. That way you don't have to start up a separate dialog. Please see http://developer.android.com/guide/topics/ui/themes.html#ApplyATheme for how to do this.
you can start by learning on how to create an activity that looks like a dialog (no title bar, transparent background, "floating" effect, etc.)
and no, you can't just start a dialog without an activty
No, you can't hijack activity that is not "yours" and command it to show dialog.
Your approach of starting your own activity is the classic one.
You cannot show a dialog. But you can go the alernative way by inflating your customized view so that you can show a dialog on the screen whenver certain conditions are met.
Hi it is possible in android to show pop-up dialog from background running service?
and answer is positive than how can i do that
There are several options. You can use a theme and make an activity look and behave like a dialog (as in this question) by setting the android:theme attribute of your <activity> to #android:style/Theme.Dialog or a customized theme in your manifest.
Alternatively, you could create a translucent activity by setting the theme to #android:style/Theme.Translucent.NoTitleBar and then launch a regular dialog from the activity. As the comments on one of the answers to the question advise, in this case just make sure to finish() the translucent activity whenever the dialog is dismissed.