How to use global variable in onCreate method of Android

Question

I am very much new to Android world. I was just trying to check how a global variable can be used in onCreate() method in Android, whenever i tried doing so, it closed abruptly. When I displayed some random text in the code, it was displayed successfully.

Here's my code:

public class MyActivity extends AppCompatActivity
{
    public static int num_i=0;

    @Override
    protected void onCreate(Bundle savedInstanceState)
    {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_find_beer);
        TextView tv = findViewById(R.id.textView);
        tv.setText(num_i);
        num_i++;
    }
}

Please help me in this.

Ok, let's assume I am a magician, and can see the stacktraceof your exception. It tells you that resource with identifier <some identifier> not found. That happens because TextView.setText() has more than one overload. So TextView.setText(int), which you are calling expects the String resource identifier as a parameter (R.string.something for example). If you want to show an int in the TextVIew, you first have to convert it to string. — Vladyslav Matviienko
– Vladyslav Matviienko, Commented Nov 13, 2017 at 9:11
Title in this question is completely misleading, can you please update the title of your question to reflect more on the setText with int parameter problem? — pleft
– pleft, Commented Nov 13, 2017 at 9:20

Community · Accepted Answer · 2020-06-20 09:12:55Z

6

setText(CharSequence text)

Sets the text to be displayed. it takes String as a parameter not a number

Sample : tv.setText("PREM");

setText(int resid)

Sets the text to be displayed using a string resource identifier.

Sample : tv.setText(R.string.app_name);

first you have to convert your int value in to a String

Try this use

tv.setText(String.valueOf(num_i));

or

tv.setText(num_i+"");

instead of this

 tv.setText(num_i);

edited Jun 20, 2020 at 9:12

CommunityBot

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answered Nov 13, 2017 at 9:09

Goku

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2 Comments

pleft Over a year ago

Also exists: void setText (int resid) which takes an int as parameter

Goku Over a year ago

i was just updating my thanks for your suggestion @pleft

Goku · Accepted Answer · 2017-12-26 12:07:02Z

1

Don't use tv.setText() with a number as parameter. Try using String.valueOf(num_i).

So in your case: tv.setText(String.valueOf(num_i)) or tv.setText(num_i + "");

edited Dec 26, 2017 at 12:07

Goku

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answered Nov 13, 2017 at 9:10

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