If you want your android app to use phone camera and capture an image then you need to create a camera intent in the following way. 
Intent cameraIntent = new Intent(android.provider.MediaStore.ACTION_IMAGE_CAPTURE); 
startActivityForResult(cameraIntent, CAMERA_REQUEST);

CAMERA_REQUEST is integer which contains your request number.

The following example code explains its usage.

Button cam_button,gal_button;
static Bitmap bMap;
private static final int CAMERA_REQUEST = 1888;

@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.second_screen);
cam_button=(Button) findViewById(R.id.camera);
cam_button.setOnClickListener(this);

}

@Override
public void onClick(View v)
{

Intent cameraIntent = new Intent(android.provider.MediaStore.ACTION_IMAGE_CAPTURE); 
startActivityForResult(cameraIntent, CAMERA_REQUEST);

}

protected void onActivityResult(int requestCode, int resultCode, Intent data, Intent imageReturnedIntent)

if (requestCode == CAMERA_REQUEST)

bMap = (Bitmap) data.getExtras().get(“data”);


}

When onActivityResult is called ,if requestCode matches our CAMERA_REQUEST then image is stored in bMap of type Bitmap. bMap can be later used in the app.

Hope this post is helpful.

Posted by: Rachita Nanda