Let visibility of "laser scanner" be set (#503)

* Add laser visibility attribute

* Add laser visibility attribute usage to sample project

- set to true to stick with the current behavior
- included for didactic reasons

* Add laser visibility attribute to ViewfinderView and set it accordingly

* Draw "laser scanner" only if wanted

* Let laser visibility be changed programmatically

* Add sample code to show how laser visibility can be changed programmatically

1 files changed, 5 insertions, 0 deletions

diff --git a/sample/src/main/java/example/zxing/CustomScannerActivity.java b/sample/src/main/java/example/zxing/CustomScannerActivity.java
index 2292e59f..12840733 100644
--- a/sample/src/main/java/example/zxing/CustomScannerActivity.java
+++ b/sample/src/main/java/example/zxing/CustomScannerActivity.java
@@ -48,6 +48,7 @@ public class CustomScannerActivity extends Activity implements
         capture.decode();
 
         changeMaskColor(null);
+        changeLaserVisibility(true);
     }
 
     @Override
@@ -102,6 +103,10 @@ public class CustomScannerActivity extends Activity implements
         viewfinderView.setMaskColor(color);
     }
 
+    public void changeLaserVisibility(boolean visible) {
+        viewfinderView.setLaserVisibility(visible);
+    }
+
     @Override
     public void onTorchOn() {
         switchFlashlightButton.setText(R.string.turn_off_flashlight);