如何在条码android中增加矩形大小

Question

我正在使用条形码扫描仪，其中红线和矩形看起来很小并且在角落处可见。如何在矩形框的中心绘制类似于此链接的红线？

http://blog.digitaltinder.net/wp-content/uploads/2009/08/BarcodeScanner_thumb.png

我得到的是：

我的代码如下

IntentIntegrator scanIntegrator = new IntentIntegrator(BarcodeScan.this);
scanIntegrator.initiateScan();
public void onActivityResult(int requestCode, int resultCode, Intent intent) {     
    IntentResult scanningResult =IntentIntegrator.parseActivityResult(requestCode, resultCode, intent);
    if (scanningResult != null) {
        //get content from Intent Result
        String scanContent = scanningResult.getContents();
        //get format name of data scanned
        String scanFormat = scanningResult.getFormatName();
        Toast.makeText(getApplicationContext(), scanContent+scanFormat,Toast.LENGTH_SHORT).show();
    }
}