android studio error cant resolve symbol

Asked Nov 14 '17 at 11:44

Active Nov 14 '17 at 11:50

Viewed 40 times

i have tried out Android Studio but now i have a Problem in my code i have tried to find a button but this dont work with this code

import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;

public class Menu extends Activity implements View.OnClickListener {

    Button btnspielen = (Button) findViewById(R.id.btnspielen);

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_menu);
        btnspielen.setOnClickListener(this);
    }

    @Override
    public void onClick(View v) {}
}

but the problem now is that Android Studio says cant resolve Symbol R and I don't know why and the day before it Worked.

edited Nov 14 '17 at 11:50

Tim

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asked Nov 14 '17 at 11:44

coolian

and what is R? if it's not a class in the same package as that one, import it. or figure out what you do need there – Stultuske Nov 14 '17 at 11:45
Look at the code in the Video https://youtu.be/F-k5gwz_91o?t=984 in line 21 – coolian Nov 14 '17 at 11:51
so basically, you are following a vague crappy tutorial and can't figure out why it won't work.. I would recommend finding some better resources to study from – Stultuske Nov 14 '17 at 12:00
ok thanks for help – coolian Nov 14 '17 at 12:16
@coolian Try to go to File --> Invalidate Cathes & Restart --> Invalidate & restart. If it doesn't help - maybe something is wrong with the xml. – MorZa Nov 14 '17 at 13:13
i will trying it – coolian Nov 16 '17 at 20:58
That does not Work it says grdle build finished with one Errors null vulue entry: increment Folder = null – coolian Nov 18 '17 at 13:16

android studio error cant resolve symbol

0 Answers0