这个库对  进行了封装，使用方便也可扩展

集成：

compile 'com.google.zxing:core:3.3.0'    compile 'com.journeyapps:zxing-android-embedded:3.5.0'

调用：

new IntentIntegrator(this).initiateScan();//或者IntentIntegrator integrator = new IntentIntegrator(ScanActivity.this);integrator.setPrompt("扫描");integrator.setCameraId(0); //前置|后置摄像头integrator.setBeepEnabled(true); //扫描成功提示音integrator.setOrientationLocked(false);//方向锁定integrator.initiateScan();// 回调:@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, "Cancelled", Toast.LENGTH_LONG).show();        } else {            Toast.makeText(this, "Scanned: " + result.getContents(), Toast.LENGTH_LONG).show();        }    } else {        super.onActivityResult(requestCode, resultCode, data);    }}

现在是个横向的扫描，体验不是很好，如需竖屏在清单中添加：