cannot be resolved or is not a field [closed]

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i would like to ask how can i solve this problem ..

public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.main);

    textOut =(TextView) findViewById(R.id.tvGetInput);
    getInput = (EditText) findViewById(R.id.etInput);
    Button ok = (Button) findViewById (R.id.bOk);
    ok.setOnClickListener(new View.OnClickListener() {

(the tvGetInput, etInput ,bOk has the error) it says "cannot be resolve or is not a field"

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first , clean an re-build your project like this :

Project ==> Clean ==> Check your project and press OK.

second , verify your imports, if there is the import android.R , delete it , you should import the R of your project :

example : import com.test.R;

Regards

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Check your imports. There shan't be android.R. Also check if you declared these ids in your main layout. If all is ok, clean and build your project.