Question

我得到了一个类，它需要变量Context＆amp; URI

如何从其他类

调用此函数

我把MainActivity.this，uri

但仍然有一个NULL字符串

为什么方法“发送”不会发生？

Main.class

 String predict = "Default";
 predict = VisionClient.send(MainActivity.this, uri);
 Log.e("try","predict =>>>>>>> " + predict); // predict got "Default"

VisionClient.class

public final static String send(Context context, Uri uriImage) throws Exception{

        InputStream credentialsStream = context.getResources().openRawResource(R.raw.calories_4348f6cf420);
        GoogleCredential credential = null;

            credential = GoogleCredential.fromStream(credentialsStream, AndroidHttp.newCompatibleTransport(), new AndroidJsonFactory()).createScoped(VisionScopes.all());

        Vision vision  = new Vision(AndroidHttp.newCompatibleTransport(), new AndroidJsonFactory(), credential);
        String path = ImagenMediaStoreUtils.getPath(context, uriImage);
        File wiki_path = new File(path);
        Image image = new Image().encodeContent(readFileToBytes(wiki_path));


        BatchAnnotateImagesRequest content = new BatchAnnotateImagesRequest();

        Feature textDetection = new Feature();
        textDetection.setType("TEXT_DETECTION");
        textDetection.setMaxResults(1);


        List<Feature> featureList = Lists.newArrayList();
        featureList.add(textDetection);


        List<AnnotateImageRequest> anImgReqList = Lists.newArrayList();

        AnnotateImageRequest annotatedImageReq = new AnnotateImageRequest();
        annotatedImageReq.setFeatures(featureList);
        annotatedImageReq.setImage(image);

        anImgReqList.add(annotatedImageReq);

        content.setRequests(anImgReqList);

        BatchAnnotateImagesResponse response = vision.images().annotate(content).execute();

        if(response.getResponses() == null || response.getResponses().get(0) == null
                || response.getResponses().get(0).getTextAnnotations() == null
                || response.getResponses().get(0).getTextAnnotations().get(0) == null
                || response.getResponses().get(0).getTextAnnotations().get(0).getDescription() == null){
            throw new Exception("response null");
        }
        return response.getResponses().get(0).getTextAnnotations().get(0).getDescription();
    }

Answer 1

确保你做两件事：

从一个线程中调用send方法，否则Android会抛出错误，比如
context是MainActivity中的一个类变量，您将使用

try { Thread t1 = new Thread(new Runnable(){ public void run(){ String response = null; try { response = VisionClient.send(context, photoFile, mCurrentPhotoPath); } catch (Exception e) { e.printStackTrace(); } txtComputerVisionTextResult.setText(response); Toast toast = Toast.makeText(context, "response = " + response, Toast.LENGTH_LONG); toast.show(); } } ); t1.start();

和

<asp:ListView ID="LVCateMenu" runat="server">
     <ItemTemplate>
       <li class="<%=Response.Write(ActiveClass);%>"><asp:HyperLink runat="server" NavigateUrl="#"><%#Eval("cate_name") %></asp:HyperLink></li>
     </ItemTemplate>
</asp:ListView>

上下文＆amp;类之间的Uri设置

1 个答案: