cannot resolve symbol(context)

Question

As still very young in android. am getting this error on this line in my code: new AlertDialog.Builder(context). The error I get is cannot resolve symbol(context).

please kindly help,

   case R.id.chk_clas1:
            //do stuff
            if (chk_clas1.isChecked()) {
                if(c1.equals("0")){
                adddate(txt_clas1);}
                clas="1";
                fdate=txt_clas1.getText().toString();

                new AlertDialog.Builder(context)
                  .setTitle("Delete entry")
                  .setMessage("Are you sure you want to delete this entry?")
                .setPositiveButton(android.R.string.yes, new DialogInterface.OnClickListener() {
                public void onClick(DialogInterface dialog, int which) {
                                // continue with delete
                            }
                        })
                        .setNegativeButton(android.R.string.no, new DialogInterface.OnClickListener() {
                            public void onClick(DialogInterface dialog, int which) {
                                // do nothing
                            }
                        })
                        .setIcon(android.R.drawable.ic_dialog_alert)
                        .show();

            } else {
                txt_clas1.setText("");

            }

Alert dialog doesn't work with `Context`, where are you writing this code? pleas post your full activity.. — V-rund Puro-hit, May 21 '16 at 11:13
Is their anything you have defined globally for `context` ? Please post your full code. — Jay Rathod, May 21 '16 at 11:25
@user3367817 Use `new AlertDialog.Builder(getActivity())` if you are using `Fragment`. — Jay Rathod, May 21 '16 at 11:46

Amit Vaghela · Accepted Answer · 2016-05-21T11:34:04.897

2

Here, you use context as a variable but you have neither declared it, or initialised it, hence the error.

You could define it (and initialise at the same time)

 Context context = this;

since this refers to the current object instance of a class and Activity is a Context.

if you extends activity than use

new AlertDialog.Builder(this)

if you extends fragment than use

new AlertDialog.Builder(getActivity())

edited May 21 '16 at 11:34

answered May 21 '16 at 11:14

Amit Vaghela

22,772
22
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I extend fragment but you didnt complete that line of code you gave new AlertDialog.Builder(getActivity(), .....???? – user3367817 May 21 '16 at 11:41
Okay. Now I have completed that. Write getActivity() in that. – Amit Vaghela May 21 '16 at 11:43
I tried to use 'this' but it does not work. context doesn't work either – Aug 13 '18 at 02:04
@Magic_Whizz are you using in fragments ? – Amit Vaghela Aug 13 '18 at 05:07
@Magic_Whizz use **this@youractivityname** – Amit Vaghela Aug 13 '18 at 05:13
this is what I have and does not work: AlertDialog.Builder alertDialogBuilder = new AlertDialog.Builder(this.create); – Aug 13 '18 at 05:27
it goes red for .create – Aug 13 '18 at 05:29
@Magic_Whizz dont use .create ? use like AlertDialog.Builder alertDialogBuilder = new AlertDialog.Builder(yourActivityName.this); – Amit Vaghela Aug 13 '18 at 05:31
check https://stackoverflow.com/questions/43513919/android-alert-dialog-with-one-two-and-three-buttons – Amit Vaghela Aug 13 '18 at 05:32

score 0 · Answer 2 · edited May 21 '16 at 11:36

0

Instead of context use yourActivity.this

because context is current class instance in my case

My Activity is MainActivity so I will use MainActivity.this

new AlertDialog.Builder(MainActivity.this)

edited May 21 '16 at 11:36

V-rund Puro-hit

5,518
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answered May 21 '16 at 11:14

Mohammed Sameer Ahmad

419
2
5

Sameer Ahmed, when i changed it to my activity, i got this error saying Builder(android.content.Content) in Builder cannot be applied to (Com.tracker.Tracking.this) – user3367817 May 21 '16 at 11:21

score 0 · Answer 3 · answered May 21 '16 at 11:21

0

try this, replace context with classname.this

answered May 21 '16 at 11:21

Manmohan Kumar

334
2
8

when i replaced context with my classname (Tracking.this), i got this error saying Builder(android.content.Content) in Builder cannot be applied to (Com.tracker.Tracking.this) – user3367817 May 21 '16 at 11:25
is this a Activity class? – Manmohan Kumar May 21 '16 at 11:32
then try this, fragmentClassName.getContext() – Manmohan Kumar May 21 '16 at 11:44

cannot resolve symbol(context)

3 Answers3