Question

我正在尝试开发一个应用程序，它将扫描条形码，将值存储在变量中，然后扫描另一个条形码并将该值与之前的值匹配，并返回“匹配”或“不匹配”结果。我已经得到了第一部分工作，感谢foamyguy的帮助，这是我使用的初始代码，

package com.barcodesample;

import android.app.Activity;
import android.app.AlertDialog;
import android.content.ActivityNotFoundException;
import android.content.DialogInterface;
import android.content.Intent;
import android.net.Uri;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.TextView;

public class BarcodeSample extends Activity {

private Button scanBtn;
private TextView resultsTxt;


/** Called when the activity is first created. */;
@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.main);
    scanBtn = (Button) findViewById(R.id.scanBtn);
    resultsTxt = (TextView) findViewById(R.id.resultsTxt);




    scanBtn.setOnClickListener(new OnClickListener() {
        public void onClick(View v) {
            resultsTxt.setText("Scanning...");




        Intent intent = new intent("com.google.zxing.client.android.SCAN"); 


            try {
                startActivityForResult(intent, 0);
            } catch (ActivityNotFoundException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();

                new AlertDialog.Builder(v.getContext())
                .setTitle("WARNING:")
                            .setMessage("You don't have Barcode Scanner  installed. Please install it.")
                .setCancelable(false) 
                .setNeutralButton("Install it now", new DialogInterface.OnClickListener() {
                    public void onClick(DialogInterface dialog, int whichButton) {

                        Uri uri = Uri.parse("market://search?q=pname:com.google.zxing.client.android");  
                        startActivity(new Intent(Intent.ACTION_VIEW, uri));                                         
                    }
                })
                .show();
            }

        }
    });



}

/*Here is where we come back after the Barcode Scanner is done*/
public void onActivityResult(int requestCode, int resultCode, Intent intent) {
    if (requestCode == 0) {
        if (resultCode == RESULT_OK) {
            // contents contains whatever the code was
            String contents = intent.getStringExtra("SCAN_RESULT");

            // Format contains the type of code i.e. UPC, EAN, QRCode etc...
            String format = intent.getStringExtra("SCAN_RESULT_FORMAT");

            // Handle successful scan. In this example I just put the results into the TextView
            resultsTxt.setText(format + "\n" + contents);
        } else if (resultCode == RESULT_CANCELED) {
            // Handle cancel. If the user presses 'back' before a code is scanned.
            resultsTxt.setText("Canceled");
        }
    }
}

}

现在如何使用与上面类似的另一个扫描按钮启动另一个意图，最后如何比较两个值并在新屏幕中返回匹配或不匹配？

提前感谢宝贵的建议

Answer 1

在下面的其他按钮上使用相同的代码。

startActivityForResult(intent, 1); // right now it's 0 for button 1

现在在onActivityResult中再添加一个部分，以便返回第二个按钮的结果。

if (requestCode == 1) {
// your code here that will be used for comparing.
}

Zxing条码匹配app for android

1 个答案: