android - eclipse - R cannot be resolved to a variable ERROR

Question

I'm getting a strange error eclipse says "R cannot be resolved to a variable"

I don't know wath to do.

Do i have to poste my Manifest file? My xml file?

I have tryed : clean project update AVD update SDK

this is my code:

//package

//imports

 public class MainActivity extends Activity implements OnClickListener{

public Handler timer = new Handler();

public int counter = 0;

 //vars

TextView mTextView;
ImageButton finishhimbutton;
ImageButton resetbutton;

 //images

public ImageView jb1;
public ImageView jb2;
public ImageView jb3;
public ImageView jb4;
public ImageView jb5;
public ImageView jb6;
    TextView txtCount;




@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);

//define

        txtCount = (TextView)findViewById(R.id.timer);              
        txtCount.setText(String.valueOf(counter));
        jb1 = (ImageView) findViewById(R.id.JB1);
        jb2 = (ImageView) findViewById(R.id.JB2);
        jb3 = (ImageView) findViewById(R.id.JB3);
        jb4 = (ImageView) findViewById(R.id.JB4);
        jb5 = (ImageView) findViewById(R.id.JB5);
        jb6 = (ImageView) findViewById(R.id.JB6);

 //click button
        finishhimbutton = (ImageButton) findViewById(R.id.finishhim);
        resetbutton = (ImageButton) findViewById(R.id.reserbutton);
        timer = new Handler();


        final Runnable hMyTimeTask = new Runnable() {
               public void run() {

                    if (counter < 49) {

                    counter = 0;
                    txtCount.setText(String.valueOf(counter));
                    jb1.setVisibility(ImageView.VISIBLE);
                    jb2.setVisibility(ImageView.INVISIBLE);
                    jb3.setVisibility(ImageView.INVISIBLE);
                    jb4.setVisibility(ImageView.INVISIBLE);
                    jb5.setVisibility(ImageView.INVISIBLE);
                    jb6.setVisibility(ImageView.INVISIBLE);
                    }

                   else if (counter > 50) {     
                    Toast.makeText(MainActivity.this, "WINNER", Toast.LENGTH_SHORT).show();

                }
               }

            }; 



        finishhimbutton.setOnClickListener(new OnClickListener() {

            @Override
            public void onClick(View v) {
                    if (counter == 1) {
                    timer.removeCallbacks(hMyTimeTask);
                    timer.postDelayed(hMyTimeTask, 4000);
                 }

           switch(counter){

     //case's

           case 1:
                    counter++;
                    txtCount.setText(String.valueOf(counter));
                    jb1.setVisibility(ImageView.VISIBLE);
                    jb2.setVisibility(ImageView.INVISIBLE);
                    jb3.setVisibility(ImageView.INVISIBLE);
                    jb4.setVisibility(ImageView.INVISIBLE);
                    jb5.setVisibility(ImageView.INVISIBLE);
                    jb6.setVisibility(ImageView.INVISIBLE);
                    break;

                        //................and more case's
                                //there are more case's


                }

                }


}

);

    //reset button

resetbutton.setOnClickListener(new OnClickListener() {

    @Override
    public void onClick(View v) {
            counter = 0;
            txtCount.setText(String.valueOf(counter));
            jb1.setVisibility(ImageView.VISIBLE);
            jb2.setVisibility(ImageView.INVISIBLE);
            jb3.setVisibility(ImageView.INVISIBLE);
            jb4.setVisibility(ImageView.INVISIBLE);
            jb5.setVisibility(ImageView.INVISIBLE);
            jb6.setVisibility(ImageView.INVISIBLE);
              Intent screen = new Intent(MainActivity.this, startscreen.class);
              MainActivity.this.startActivity(screen);
        }
    });
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
    getMenuInflater().inflate(R.menu.main, menu);
    return true;
}

@Override
public void onClick(View v) {

}
}

check if you have import android.R instead of your project's R class — stinepike, Jan 17 '14 at 17:16
if i import android.r; i get error's on R.layout.activity_main <---- — CaptainStony, Jan 17 '14 at 17:19
Look in your project's gen folder. Is R.java in there? If not, you most likely have an error in one of your layout xml files. — NigelK, Jan 17 '14 at 17:21

score 2 · Accepted Answer · answered Jan 17 '14 at 17:20

2

check if you import android.R and check your xmls for errors and also rebuild all project

answered Jan 17 '14 at 17:20

Defter

214
1
7

if i import android.r; i get error's on R.layout.activity_main <---- – – CaptainStony Jan 17 '14 at 17:20
check activity_main.xml exist in layout and look inside maybe in this file you make some error – Defter Jan 17 '14 at 17:22
But also R.id.timer and more – CaptainStony Jan 17 '14 at 17:26
@CaptainStony remove `import android.R;`. R.java will not be generated if you have errors in your resource files – Raghunandan Jan 17 '14 at 17:28
I have removed android.R; and now the file is not generating – CaptainStony Jan 17 '14 at 17:32
Did you see any errors now ? What are those ? If no errors seen, try to do Project --> Clean as a first step and notice if any errors come up and comment back – Ramakishna Balla Jan 17 '14 at 17:50

score 1 · Answer 2 · answered Jun 11 '15 at 06:13

1

close Eclipse and open your Workspace directory.
look for a folder named ".metadata" and delete that folder.

the Error should go away :)

answered Jun 11 '15 at 06:13

01wifi01

415
6
15

score 0 · Answer 3 · edited Jan 17 '14 at 19:38

0

1.Remove import android.R; and your main project import.

2.Then go to the error variable and import your project reference.

edited Jan 17 '14 at 19:38

Afzaal Ahmad Zeeshan

15,669
12
55
103

answered Jan 17 '14 at 17:23

Sunny

219
1
10

Sorry i don't know wath you mean – CaptainStony Jan 17 '14 at 17:27
actually there will be an import of android.R in your MainActivity class...First remove this. – Sunny Jan 17 '14 at 17:30
also remove your main project import – Sunny Jan 17 '14 at 17:32
after that go to any variable and import your main project refrence like – Sunny Jan 17 '14 at 17:35
Sorry but how do i do that? – CaptainStony Jan 17 '14 at 17:52
go to this line in your code. jb1 = (ImageView) findViewById(R.id.JB1); – Sunny Jan 17 '14 at 18:03
and hover on R.id.JB1 ,it will display the available import then import your main project reference(your main package name). – Sunny Jan 17 '14 at 18:05
When i hover on it it says to change the name – CaptainStony Jan 17 '14 at 18:14
Can you give me an example please? – CaptainStony Jan 17 '14 at 19:16
But the R.java is missing do you know how to generate it? – CaptainStony Jan 17 '14 at 19:17

score 0 · Answer 4 · edited May 23 '17 at 11:51

0

I suggest you search Stack Overflow before opening a new report.

This will help :

"R cannot be resolved to a variable"?

edited May 23 '17 at 11:51

Community

1
1

answered Jan 17 '14 at 17:31

IanB

3,489
1
20
24

I don't get it i know the problem but I don't know how to solve it the problem is : R.java don't generate – CaptainStony Jan 17 '14 at 19:33
As others have said, this is a very common problem which arises when you make a mistake in your program. For example, it might be an error in one of your xml file. Most Android programmers encounter this from time to time and you should look at the link I provided. – IanB Jan 17 '14 at 23:27

android - eclipse - R cannot be resolved to a variable ERROR

4 Answers4