如何在Android sdutio项目中利用Zxing实现一个扫码功能

//1.默认选项启动意图new IntentIntegrator(MainActivity.this).initiateScan(); // `this` is the current Activity//2.获取得到的结果：@Overrideprotected void onActivityResult(int requestCode, int resultCode, Intent data) { IntentResult result = IntentIntegrator.parseActivityResult(requestCode, resultCode, data); if(result != null) {  if(result.getContents() == null) {   Toast.makeText(this, "取消扫码", Toast.LENGTH_LONG).show();  } else {   Toast.makeText(this, "扫码结果：" + result.getContents(), Toast.LENGTH_LONG).show();  } } else {  super.onActivityResult(requestCode, resultCode, data); }}