fix NPE

Signed-off-by: Umair Khan <[email protected]>

Author: omerjerk

src/in/omerjerk/processing/video/android/Capture.java

@@ -14,11 +14,15 @@ public class Capture extends PImage implements PConstants {
 
 	private static Context context;
 
-	private static ArrayList<String> camerasList;
+	private static ArrayList<String> camerasList = new ArrayList<>();
 
 	private static final String KEY_FRONT_CAMERA = "front-camera-%d";
 	private static final String KEY_BACK_CAMERA = "back-camera-%d";
 
+	public Capture (PApplet context) {
+		Capture.context = context;
+	}
+	
 	public static String[] list() {
 		ensureContext();
 		if (context.getPackageManager().hasSystemFeature(PackageManager.FEATURE_CAMERA)) {
@@ -42,10 +46,7 @@ public static String[] list() {
 
 	private static void ensureContext() {
 		if (context == null) {
-			context = PApplet.getInstance();
-			if (context == null) {
-				throw new NullPointerException("null context");
-			}
+			throw new RuntimeException("Create the instance of Capture class first.");
 		}
 	}
 }