如何在Zxing Scanner页面添加按钮？

Question

我正在尝试在Zxing Scanner页面中实现按钮。我尝试了这个链接Add the flashlight button above the Zxing Scanner page，但它在我的代码中无效。这里我附上了java代码。请提出一些好的解决方案。

import android.Manifest;

import android.app.Activity;
import android.content.Context;
import android.content.pm.PackageManager;
import android.os.Bundle;
import android.support.v4.app.ActivityCompat;
import android.support.v4.content.ContextCompat;
import android.support.v7.app.AppCompatActivity;
import android.util.AttributeSet;
import android.util.Log;
import android.widget.Button;

import android.widget.FrameLayout;

import com.google.zxing.Result;
import android.view.ViewGroup.LayoutParams;
import android.widget.LinearLayout;
import android.widget.Toast;

import me.dm7.barcodescanner.zxing.ZXingScannerView;

public class WorkOut extends AppCompatActivity implements ZXingScannerView.ResultHandler{

Integer response = 0 ;
int currentIndex=0;

private ZXingScannerView mScannerView;
@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);


    mScannerView = new ZXingScannerView(this);
    Button scanButton = new Button(this);

    LinearLayout.LayoutParams params =
        new LinearLayout.LayoutParams(
            LinearLayout.LayoutParams.WRAP_CONTENT,
            LinearLayout.LayoutParams.WRAP_CONTENT);

    scanButton.setText("Flash Light");
    scanButton.setLayoutParams(params);
    setContentView(mScannerView);
    mScannerView.addView(scanButton);

}
private void checkPermissions() {
    try {
        for (int i = currentIndex; i < permissions.length; i++) {
            currentIndex = currentIndex + 1;
            int result = ContextCompat.checkSelfPermission(this, permissions[i]);
            if (result == PackageManager.PERMISSION_GRANTED) {
            } else {
                requestPermission(permissions[i]);
                return;
            }
        }
    } catch (Exception e) {
        e.printStackTrace();
    }
}

Activity activity = this;
Context context = this;

String[] permissions = new String[]{Manifest.permission.CAMERA};


private void requestPermission(String permission) {


    ActivityCompat.requestPermissions(activity, new String[]{permission},
        101);

}

@Override
public void onRequestPermissionsResult(int requestCode, String permissions[], int[] grantResults) {
    switch (requestCode) {
        case 101:
            if (grantResults.length > 0 && grantResults[0] == PackageManager.PERMISSION_GRANTED) {

                checkPermissions();
            } else {
                try {

                } catch (Exception e) {
                    e.printStackTrace();
                }

            }
            break;
    }
}


@Override
public void onResume() {
    super.onResume();

    if(response == 1) {
        mScannerView = null;
        mScannerView = new ZXingScannerView(this);
        setContentView(mScannerView);
        response = 0;

    }

    mScannerView.setResultHandler(this);
    mScannerView.startCamera();

}

@Override
public void onDestroy() {
    super.onDestroy();


    mScannerView.stopCamera();

}

@Override
protected void onRestart() {
    super.onRestart();
    Log.d("ani","onrestart");
}

@Override
public void handleResult(Result rawResult) {
    Toast.makeText(getApplicationContext(),"Scanned",Toast.LENGTH_SHORT).show();
}
}