Android Studio在底部中间添加一个自定义按钮以进行zxing捕获

Question

我使用lib bellow制作qr扫描仪，我用按钮调用扫描。一切都好。我需要在捕获的底部中心添加一个自定义按钮。

lib：com.journeyapps:zxing-android-embedded:3.1.0@aar

我调用扫描仪的代码：

scannow.setOnClickListener(new View.OnClickListener() {
    @Override
    public void onClick(View v) {
        IntentIntegrator scanIntegrator = new IntentIntegrator(MainActivity.this);
        scanIntegrator.setPrompt("Scanning...");
        scanIntegrator.setBeepEnabled(true);
        scanIntegrator.setDesiredBarcodeFormats(IntentIntegrator.ALL_CODE_TYPES);             scanIntegrator.setCaptureActivity(CaptureActivityAnyOrientation.class);
        scanIntegrator.setOrientationLocked(true);
        scanIntegrator.setBarcodeImageEnabled(true);
        scanIntegrator.initiateScan();
    }
});