0

我正在尝试实现一个函数，该函数通过 HTTP Post 将 base64 编码图像从 webview 传递到我的 web 应用程序。然后，可以说，这张图片必须立即显示在我的视野中。我使用了这个例子，但它不能正常工作，所以在谷歌搜索了一下之后，我开始使用 AsyncTask：

public void tryUpload(String url, Context context) {
    new UploadTask(context).execute(url);
}

private class UploadTask extends AsyncTask<String, Void, HttpResponse> {
    private Context context;
    public UploadTask(Context ctx) {
        context = ctx;
    }

    @Override
    protected HttpResponse doInBackground(String... urls) {
        List<NameValuePair> formData = new ArrayList<NameValuePair>(3);
        formData.add(new BasicNameValuePair("image", "base64EncodedString"));

        HttpPost httpPost = new HttpPost(urls[0]);
        try {
            httpPost.setEntity(new UrlEncodedFormEntity(formData, HTTP.UTF_8));
        } catch (UnsupportedEncodingException e) {
            e.printStackTrace();
        }
        HttpClient httpClient = new DefaultHttpClient();
        HttpResponse response = null;
        try {
            response = httpClient.execute(httpPost);

            WebView browser = (WebView) findViewById(R.id.my_web_engine);
            browser.setWebChromeClient(new MyWebChromeClient());
            browser.setWebViewClient(new MyWebViewClient());

            try{
                String data = new BasicResponseHandler().handleResponse(response);
                browser.loadDataWithBaseURL(urls[0], data, "text/html", HTTP.UTF_8, null);
            } catch (IOException e) {
                e.printStackTrace();
        }

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

        return response;
    }

    @Override
    protected void onPostExecute(HttpResponse response) {
        HttpEntity entity = response.getEntity();
        if (entity != null) {
            String responseBody = null;
            try {
                responseBody = EntityUtils.toString(response.getEntity());
            } catch (IOException e) {
                e.printStackTrace();
            }

            if (responseBody.equalsIgnoreCase("OK"))
                Log.w("myApp", "Everything is OK");
            else
                Log.w("myApp", "Something is wrong");
        }
    }
}

@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);

    if (Intent.ACTION_SEND.equals(action) && type != null) {
        if (type.startsWith("image/")) {
                    // for simplicity skipped image encoding to base64
                    String url = getResources().getString(R.string.url) + "/MyController/ImageUpload";
                    Context context = ImageUploadActivity.this;
                    tryUpload(url, context);
            }
        }
    }
}

这是我的 ASP.NET MVC 操作：

// temporary removed authorization
[HttpPost]
public ActionResult ImageUpload(string image)
{
    // skipped some lines
    ViewData.Add("imageFromWebView", image);
    return View();
}

并且 aView包含以下行：

<img src="data:image/png;base64,<%: (string)ViewData["imageFromWebView"] %>"/>

当我删除[HttpPost]时，视图加载没有问题，但图像不显示。

但是当我离开时[HttpPost]，我得到了一个例外

org.apache.http.client.HttpResponseException: Not Found

在以下行中：

String data = new BasicResponseHandler().handleResponse(response);

有谁知道我做错了什么？

4

0 回答 0