In Android, you can use PackageManager , hasSystemFeature() method to check if a device has camera, gps or other features.

See full example of using PackageManager in an activity class.


package com.mkyong.android;

import android.app.Activity;
import android.content.Context;
import android.content.pm.PackageManager;
import android.os.Bundle;
import android.util.Log;

public class FlashLightActivity extends Activity {

	@Override
	public void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		//setContentView(R.layout.main);

		Context context = this;
		PackageManager packageManager = context.getPackageManager();

		// if device support camera?
		if (packageManager.hasSystemFeature(PackageManager.FEATURE_CAMERA)) {
			//yes
			Log.i("camera", "This device has camera!");
		}else{
			//no
			Log.i("camera", "This device has no camera!");
		}

		
	}
}
Camera flashlight example
You may interest on this example – How to turn on/off camera LED/flashlight in Android.

Reference

  1. Android PackageManager Javadoc