Android: 我在 webview 而不是网页中出现白屏

Question

我试图在 webview 中的 android 应用程序中加载 ccavenue 页面，但我得到的不是 ccavenue 网页，而是黑屏。当我正确传递所有内容时，我不知道为什么会发生这种情况。请检查我的代码，让我知道哪里做错了。

StringBuffer params = new StringBuffer();
            params.append(ServiceUtility.addToPostParams(AvenuesParams.ACCESS_CODE,mainIntent.getStringExtra(AvenuesParams.ACCESS_CODE)));
            params.append(ServiceUtility.addToPostParams(AvenuesParams.MERCHANT_ID,mainIntent.getStringExtra(AvenuesParams.MERCHANT_ID)));
            params.append(ServiceUtility.addToPostParams(AvenuesParams.ORDER_ID,mainIntent.getStringExtra(AvenuesParams.ORDER_ID)));
            params.append(ServiceUtility.addToPostParams(AvenuesParams.REDIRECT_URL,mainIntent.getStringExtra(AvenuesParams.REDIRECT_URL)));
            params.append(ServiceUtility.addToPostParams(AvenuesParams.CANCEL_URL,mainIntent.getStringExtra(AvenuesParams.CANCEL_URL)));
            params.append(ServiceUtility.addToPostParams(AvenuesParams.ENC_VAL, encVal));

            String vPostParams = params.substring(0, params.length() - 1);

            try {
                String postData = URLEncoder.encode(vPostParams, "UTF-8");
                webview.postUrl(Constants.TRANS_URL, postData.getBytes());
                Log.d("webview test", "testing");
                Log.d("webview test",vPostParams);
            } catch (Exception e) {
                showToast("Exception occured while opening webview.");
            }

字符串 vPostParams 的值为，

access_code=AVBJ63DA70BU19JBUB&merchant_id=86529&order_id=2383911&redirect_url=http://52.11.225.96&cancel_url=http://52.11.225.96&enc_val=FE9+b0quu5a8GBqGPG0yGA6bnqJLi34iW2hdxwKTo0sPfZRJDQwQxOzCAoN06CYB1n+gUQz5knNNfNcD5IBcbRs5aJtMs0pc9Beekj5lk9bFMd8BGgUse9oHeKqhOQc5WBLDOETAO/Hu9YNS4MTHNweieCP10PHj9eMzDEOgzjkbNwc8vhU4arYvSjwqT3JKtQKpVlwWL47StVNB/6SsVutmyudbesNGx626ZK9VbcTrpqabFWHQ2p2aQH9tW5YcApbUnLChbfmEyCTZ7YyO0jafQcbDWsRa4XT8XTXGY4KvZBn1VkeYBSJ91zIjT2yR+XMgahbrGVtUcOK8midvJA==

Answer 1

这段代码对我有用，请查看。

public class CCAvenue extends ActionBarActivity {

WebView webView1;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_ccavenue);

    webView1 = (WebView) findViewById(R.id.webView1);

    String url = "http://www.example.com/controllers/user/cckit/ccavRequestHandler.php";

    webView1.setWebViewClient(new MyBrowser());

    webView1.getSettings().setLoadsImagesAutomatically(true);
    webView1.getSettings().setJavaScriptEnabled(true);
    webView1.setScrollBarStyle(View.SCROLLBARS_INSIDE_OVERLAY);

    webView1.addJavascriptInterface(new MyJavaScriptInterface(), "HTMLOUT");
    webView1.setWebViewClient(new WebViewClient() {

        @Override
        public void onPageFinished(WebView view, String url)
        {
            /* This call inject JavaScript into the page which just finished loading. */
            webView1.loadUrl("javascript:window.HTMLOUT.processHTML('<head>'+document.getElementsByTagName('html')[0].innerHTML+'</head>');");
        }

    });

    String postData = "merchant_id=12345&order_id=12345678912&amount=1&currency=INR" +
            "&cancel_url=http://www.example.com/" +
            "&redirect_url=http://www.example.com/controllers/user/cckit/ccavResponseHandler.php" +
            "&language=EN";


    webView1.postUrl(url,EncodingUtils.getBytes(postData, "BASE64"));
    //webView1.loadUrl(url);
}

private class MyBrowser extends WebViewClient {
      @Override
      public boolean shouldOverrideUrlLoading(WebView view, String url) {
         view.loadUrl(url);
         return true;
      }
   }

class MyJavaScriptInterface
{
    @JavascriptInterface
    public void processHTML(String html)
    {
       // here you can handel response from CCAvenue.
       System.out.println("Response : " + html);
    }
}

Answer 2

在您应用的 build.gradle 中添加 useLibrary 'org.apache.http.legacy' 并添加此代码

        StringBuffer params = new StringBuffer();
        params.append(ServiceUtility.addToPostParams(AvenuesParams.ACCESS_CODE,mainIntent.getStringExtra(AvenuesParams.ACCESS_CODE)));
        params.append(ServiceUtility.addToPostParams(AvenuesParams.MERCHANT_ID,mainIntent.getStringExtra(AvenuesParams.MERCHANT_ID)));
        params.append(ServiceUtility.addToPostParams(AvenuesParams.ORDER_ID,mainIntent.getStringExtra(AvenuesParams.ORDER_ID)));
        params.append(ServiceUtility.addToPostParams(AvenuesParams.REDIRECT_URL,mainIntent.getStringExtra(AvenuesParams.REDIRECT_URL)));
        params.append(ServiceUtility.addToPostParams(AvenuesParams.CANCEL_URL,mainIntent.getStringExtra(AvenuesParams.CANCEL_URL)));
        params.append(ServiceUtility.addToPostParams(AvenuesParams.ENC_VAL, URLEncoder.encode(encVal)));

        String vPostParams = params.substring(0, params.length() - 1);

        try {
            String postData = URLEncoder.encode(vPostParams, "UTF-8");
            webview.postUrl(Constants.TRANS_URL, EncodingUtils.getBytes(vPostParams, "UTF-8"));
            Log.d("webview test", "testing");
            Log.d("webview test",postData);
        } catch (Exception e) {
            showToast("Exception occured while opening webview.");
        }

Android: 我在 webview 而不是网页中出现白屏

Android: I am getting white screen in webview instead of web page

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