I used AndEngine gles1 along with the tmx plugin to generate my background maps. The image width is not fit to my virtual device, so I increased the tmx image size. Here is my code for the camera width and Camera Height:
CAMERA_HEIGHT = 320;
final DisplayMetrics displayMetrics = new DisplayMetrics();
this.getWindowManager().getDefaultDisplay().getMetrics(displayMetrics);
float aspectRatio = (float) displayMetrics.widthPixels / (float) displayMetrics.heightPixels;
CAMERA_WIDTH = Math.round(aspectRatio * CAMERA_HEIGHT);
But it shows me black bars as follows: