public class MainActivity extends AppCompatActivity {
    ImageView mImageView;
    ImageButton cameraBtn;
    ImageButton detectBtn;
    Bitmap imageBitmap;
    TextView textView;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        mImageView = findViewById(R.id.mImageView);
        cameraBtn = findViewById(R.id.cameraButton);
        detectBtn = findViewById(R.id.detectButton);
        textView = findViewById(R.id.textView);

        cameraBtn.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                openCamera();
            }
        });
        detectBtn.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                detectImg();
            }
        });
    }