Bitmap, nullpointer exception

Question

I am trying to write program that transforms a picture to black-white picture. I encountered with a problem and searched for the same issues but i didn't find a proper solution for me. Here is the code:

public class MainActivity extends AppCompatActivity {

ImageView image;
Drawable drawable;
Bitmap bitmap;

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

    image = (ImageView) findViewById(R.id.imageView);

    bitmap = ((BitmapDrawable)image.getDrawable()).getBitmap(); **// Here is line that error occur**

    image.setImageBitmap(converter(bitmap));

}

public Bitmap converter(Bitmap first) {
     Bitmap end = Bitmap.createBitmap(first.getWidth(),
             first.getHeight(),
             first.getConfig());

Stacktrace:

Caused by: java.lang.NullPointerException: Attempt to invoke virtual method 'android.graphics.Bitmap android.graphics.drawable.BitmapDrawable.getBitmap()' on a null object reference
                      at com.example.murat.giveeffect.MainActivity.onCreate(MainActivity.java:26)

Try this image.setDrawingCacheEnabled(true); bitmap = image.getDrawingCache(); instead bitmap = ((BitmapDrawable)image.getDrawable()).getBitmap(); — user7794434
– user7794434, Commented Dec 21, 2017 at 20:26

gcesarmza · Accepted Answer · 2017-12-21 21:18:00Z

1

You set your ImageView's bitmap drawable to a background attribute

android:background="@drawable/clip"

instead of src.

So change your resource file (activity_main.xml) by replacing background attribute to android:src:

android:src="@drawable/clip"

answered Dec 21, 2017 at 21:18

gcesarmza

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