I want to create ImageVIew from my class but i've got some exeptions and dont know why. Please help me. Here is my class
public class Card {
Bitmap bitmap;
public Card( Bitmap bitmap, LinearLayout linearLayout,Context context){
ImageView imageView=new ImageView(context);
imageView.setImageBitmap(bitmap);
imageView.setLayoutParams(new ViewGroup.LayoutParams(ViewGroup.LayoutParams.WRAP_CONTENT,
ViewGroup.LayoutParams.WRAP_CONTENT));
linearLayout.addView(imageView);
}
and
public class MainActivity extends AppCompatActivity {
Bitmap bitmap=BitmapFactory.decodeResource(getResources(),R.drawable.jpg);
Card card;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
LinearLayout linearLayout=findViewById(R.id.ll);
card=new Card(bitmap,linearLayout,this);
setContentView(R.layout.activity_main);
Move the
Bitmap bitmap = BitmapFactory.decodeResource(getResources(),R.drawable.jpg);
definition in the onCreate method. And this should solve the NullPointerException because the context is not defined yet.
So it should look as follow:
public class MainActivity extends AppCompatActivity {
Bitmap bitmap;
Card card;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
bitmap=BitmapFactory.decodeResource(getResources(),R.drawable.jpg);
LinearLayout linearLayout=findViewById(R.id.ll);
card=new Card(bitmap,linearLayout,this);
....