public CaptureActivityHandler( com.example.darren.scanner.CaptureActivity activity, Collection<BarcodeFormat> decodeFormats, Map<DecodeHintType, ?> baseHints, String characterSet, com.example.darren.scanner.camera.CameraManager cameraManager) { this.activity = activity; // 启动扫描线程 decodeThread = new DecodeThread( activity, decodeFormats, baseHints, characterSet, new com.example.darren.scanner.view.ViewfinderResultPointCallback( activity.getViewfinderView())); decodeThread.start(); state = State.SUCCESS; // Start ourselves capturing previews and decoding. this.cameraManager = cameraManager; // 开启相机预览界面 cameraManager.startPreview(); restartPreviewAndDecode(); }