Camera basics : delegating to system camera api

MainActivity.java

public class MainActivity extends AppCompatActivity {
    private static final int RQ_CAPTURE_IMG_CODE_THUMB = 100;
  
    ImageView ivTemp;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        ivTemp = findViewById(R.id.iv_tmpcheck);

        Button btCallCameraThumbnail = findViewById(R.id.bt_call_camera_thumbnail);
        btCallCameraThumbnail.setOnClickListener(v -> callCameraForThumbnail());
    }

    private void callCameraForThumbnail() {
        Intent i = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
        if (i.resolveActivity(getPackageManager()) != null) {
            startActivityForResult(i, RQ_CAPTURE_IMG_CODE_THUMB);
        }
        // ^--Ensures that there's a camera activity to handle the intent
    }

    @Override
    protected void onActivityResult(int requestCode, int resultCode, Intent data) {
      if (requestCode == RQ_CAPTURE_IMG_CODE_THUMB && resultCode == RESULT_OK) {
            if (data != null && data.getExtras() != null) {
                Bitmap imageBitmap = (Bitmap) data.getExtras().get("data");
                onBitmapRecieved(imageBitmap);
            }
        }
    }
    private void onBitmapRecieved(Bitmap imageBitmap) {
        ivTemp.setImageBitmap(imageBitmap);
        
    }


}