Question

扫描条形码后，我无法让zxing做任何事情。我用zxing打电话给zxing：

IntentIntegrator.initiateScan(MainActivity.this);

我的onActivityResult看起来像这样



public void onActivityResult(int requestCode, int resultCode, Intent intent) {
    if (requestCode == 0) {
        if (resultCode == RESULT_OK) {
            String contents = intent.getStringExtra("SCAN_RESULT");
            String format = intent.getStringExtra("SCAN_RESULT_FORMAT");
            if (format == "PRODUCT_CODE"){
                //If the barcode scanned is of the correct type then pass the barcode into the search method to get the product details
                Toast.makeText(getApplicationContext(),"You scanned " + contents, 3).show();
            }
            else{
                //If the barcode is not of the correct type then display a notification
                Toast.makeText(getApplicationContext(),"You didn't scan a product code", 3).show();
            }
        } else if (resultCode == RESULT_CANCELED) {
            //If the scan is cancelled then display a notification
            Toast.makeText(getApplicationContext(),"You cancelled the input", 3).show();
        }
    }

public void onActivityResult(int requestCode, int resultCode, Intent intent) { if (requestCode == 0) { if (resultCode == RESULT_OK) { String contents = intent.getStringExtra("SCAN_RESULT"); String format = intent.getStringExtra("SCAN_RESULT_FORMAT"); if (format == "PRODUCT_CODE"){ //If the barcode scanned is of the correct type then pass the barcode into the search method to get the product details Toast.makeText(getApplicationContext(),"You scanned " + contents, 3).show(); } else{ //If the barcode is not of the correct type then display a notification Toast.makeText(getApplicationContext(),"You didn't scan a product code", 3).show(); } } else if (resultCode == RESULT_CANCELED) { //If the scan is cancelled then display a notification Toast.makeText(getApplicationContext(),"You cancelled the input", 3).show(); } }

但每当我退出zxing时，都不会显示任何内容。我尝试使用示例in the zxing wiki 但每当我尝试用MainActivity或MainActivity替换你的活动时，我都会收到错误（我被告知MainActivity无法解析为字符串，并且使用MainActivity.this构造函数IntentIntegrator（MainActivity）未定义）。

基本上我不知道我在做什么，为什么它不起作用。任何帮助将不胜感激。

Answer 1

问题与您的其他问题完全相同。您无法将字符串与==进行比较，但必须使用equals()。

不知道我在用IntentIntegrator做什么

1 个答案: