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Editorial Team
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Asked: 2026-06-12T10:13:07+00:00

I have created HideImages() function as shown below. The problem is, that running this

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I have created HideImages() function as shown below. The problem is, that running this code causes NullPointerExcpection. When I comment out the setVisibility lines, it works fine. What am I doing wrong?

public class MainActivity extends Activity implements SurfaceHolder.Callback {
  ImageView img_w0, img_w1, img_w2;
  public void onCreate(Bundle savedInstanceState) {
    ImageView img_w0 = (ImageView)findViewById(R.id.img0);
    ImageView img_w1 = (ImageView)findViewById(R.id.img1);
    ImageView img_w2 = (ImageView)findViewById(R.id.img2);

    HideImages();

  }
  public void HideImages() {
    img_w0.setVisibility(View.INVISIBLE);
    img_w1.setVisibility(View.INVISIBLE);
    img_w2.setVisibility(View.INVISIBLE);
}
}
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1 Answer

  1. Editorial Team

    Make all the references of ImageView as Global as

    public class MainActivity extends Activity implements SurfaceHolder.Callback {
  ImageView img_w0, img_w1, img_w2;
  public void onCreate(Bundle savedInstanceState) {
    img_w0 = (ImageView)findViewById(R.id.img0);
     img_w1 = (ImageView)findViewById(R.id.img1);
     img_w2 = (ImageView)findViewById(R.id.img2);

    HideImages();

  }
  public void HideImages() {
    img_w0.setVisibility(View.INVISIBLE);
    img_w1.setVisibility(View.INVISIBLE);
    img_w2.setVisibility(View.INVISIBLE);
}
}
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