how to get current activity from stack activity in Android

Question

I want to get current activity from activity stack and replace with ??????

dialog =new AlertDialog.Builder(??????,android.R.style.Theme_Material_Dialog_Alert).setTitle("Tittle").setMessage("Message");`

How Can I Do it?

Update1 :

I can't use getContext() or getActivty because they return null

Also I find this

ActivityManager am =(ActivityManager)context.getSystemService(Context.ACTIVITY_SERVICE);

ComponentName cn = am.getRunningTasks(1).get(0).topActivity;

I dont know how to use cn to conver to a context or Activity ?

Please help me!!!

If you are looking for a context object, you can use `getApplicationContext()` — David Barishev, Jul 22 '18 at 15:26
"I can't use getContext() or getActivty because they return null" -- then you have your code in the wrong place. "I dont know how to use cn to conver to a context or Activity ?" -- you can't. — CommonsWare, Jul 22 '18 at 15:31
`cn` show name of my activity true but its a String if there is a way to convert this String to Activity Object or get current Activity from Activity stack my problem solve — Amir133, Jul 22 '18 at 15:35

score 0 · Accepted Answer · answered Jul 22 '18 at 15:34

0

Try this

Context context;
@Override
public void onAttach(Context context) {
    super.onAttach(context);
    this.context = context;
}

then

dialog =new AlertDialog.Builder(context,android.R.style.Theme_Material_Dialog_Alert).setTitle("Tittle").setMessage("Message");`

answered Jul 22 '18 at 15:34

prashant17

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Thanks for Answer but its may change my activity before execute `dialog =new AlertDialog.Builder...` – Amir133 Jul 22 '18 at 15:38
Yes your Answer is Correct but `dialog` show with some delay So The user can click on back button to go back to last Activity(So application may crash) – Amir133 Jul 22 '18 at 15:44
it show this Error `Unable to add window -- token android.os.BinderProxy@ee76728 is not valid; is your activity running?` – Amir133 Jul 22 '18 at 16:22
You need to figure out why your dialog causing a delay while launching – prashant17 Jul 23 '18 at 06:16
for backpress issue though its not a good solution you can maintain some `flag` for `onbackpressed` to decide whether to finish actvity or not when dialog show event is triggered – prashant17 Jul 23 '18 at 06:18

how to get current activity from stack activity in Android

1 Answers1