context error while passing asynctask value to mainactivity

Question

In my main activity if I apply this code I got error gridviewadapter() cannot be applied, it is problem in context this.

  GridViewAdapter adapter = new GridViewAdapter(this, R.layout.grid_item_layout, result);

if I apply it like this :

public MainActivity (Context context) {
        mContext = context;

    }
      GridViewAdapter adapter = new GridViewAdapter(mContext, R.layout.grid_item_layout, result);

I got this error in logcat

java.lang.InstantiationException: can't instantiate class com.justedhak.www.i.MainActivity; no empty constructor

I am trying to pass asynctask arraylist value to mainactivity .. how to fix that ?

I think you should not using constructor for `MainActivity`. You could use: `GridViewAdapter adapter = new GridViewAdapter(getApplicationContext(), R.layout.grid_item_layout, result);` — Neo, Oct 17 '15 at 09:21
@MrNeo i tried your way and it worked you can post it as answer to accept it — Moudiz, Oct 17 '15 at 09:30

score 3 · Answer 1 · answered Oct 17 '15 at 09:39

3

try

GridViewAdapter adapter = new GridViewAdapter(MainActivity.this, R.layout.grid_item_layout, result);

answered Oct 17 '15 at 09:39

RDY

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score 2 · Answer 2 · answered Oct 17 '15 at 09:21

2

remove this constructor

public MainActivity (Context context) {
    mContext = context;
}

add this inside onCreate() of MainActivity

mContext = this;

answered Oct 17 '15 at 09:21

Kishore Jethava

6,666
5
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score 2 · Answer 3 · answered Oct 17 '15 at 09:29

2

GridViewAdapter adapter = new GridViewAdapter(this, R.layout.grid_item_layout, Listitem);

answered Oct 17 '15 at 09:29

vaiju patil

56
1

BNK · Answer 4 · 2015-10-20T01:24:45.377

2

If you want to pass mContext variable, initialize this variable like the following:

public class MainActivity extends AppCompatActivity {
     private final Context mContext = this;

     ... // other codes such as onCreate...
}

Hope this helps!

edited Oct 20 '15 at 01:24

answered Oct 18 '15 at 02:11

BNK

23,994
8
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Hi man thanks for your answer, the above accepted answer did the work. Now i am working with styling the toolbar do you have answers for you about that? About toolbars? – Moudiz Oct 18 '15 at 06:12
I still didnt post the question, i still reading about it , once i ask the question ill tell you btw what time is at your country? – Moudiz Oct 18 '15 at 06:29
hi man do you have best result for this question ? http://stackoverflow.com/questions/33197213/styling-bottom-action-icon-postion-and-background-color – Moudiz Oct 18 '15 at 18:01

score 1 · Accepted Answer · answered Oct 17 '15 at 09:32

Should not using constructor for MainActivity class. Kindly using:

GridViewAdapter adapter = new GridViewAdapter(getApplicationContext(), R.layout.grid_item_layout, result);

instead of:

GridViewAdapter adapter = new GridViewAdapter(this, R.layout.grid_item_layout, result);

context error while passing asynctask value to mainactivity

5 Answers5