如何检查REST API在响应中不包含图像字段？

2024-05-17 • 问答

我正在使用WordPress REST API，因为当用户不从WordPress后端上传图像时，它不包含该字段，并且无法进行类似org.json.JSONException的异常改正：当用户上传图像时，缩略图没有值当响应没有缩略图字段

时，正在获得有关如何处理此问题的响应

    ApiInterface apiInterface = RetrofitManager.getclient().create(ApiInterface.class);
    Call<JsonObject> call = apiInterface.getPost(intvalue);
    call.enqueue(new Callback<JsonObject>() {
        @Override
        public void onResponse(Call<JsonObject> call,Response<JsonObject> response) {

            if (response.isSuccessful()) {
                response.body();

                try {
                    jsonObject = new JSONObject(response.body().toString());
                    Log.d("@@response",response.body().toString());
                    JSONObject jsonResult = jsonObject.getJSONObject("post");
                    String title = jsonResult.getString("title");
                    String expert = jsonResult.getString("excerpt");



                    if ( jsonResult.getString("thumbnail")== null) {
                        Toast.makeText(getapplicationContext(),"No Image Exist",Toast.LENGTH_SHORT).show();
                        Glide.with(getapplicationContext()).load(R.drawable.sikarlogo).into(imageView);
                    } else {
                        imageUrl  = jsonResult.getString("thumbnail");
                        Glide.with(getapplicationContext()).load(imageUrl).into(imageView);

                    }
                    tvContent.setText(expert);
                    tvTitle.setText(title);

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


                Log.e("@Success",response.message());

            } else {
                Log.e("@NO Success",response.message());

            }
        }
        @Override
        public void onFailure(Call<JsonObject> call,Throwable t) {

            Log.d("@counselingError","");
        }
    });

以及我得到的类似答复：

{
"status": "ok","post": {
    "id": 16,"type": "post","slug": "%e0%a4%95%e0%a4%bf%e0%a4%a1%e0%a4%bc%e0%a4%9c%e0%a4%bc%e0%a5%80-%e0%a4%b8%e0%a5%80%e0%a4%95%e0%a4%b0-%e0%a4%ae%e0%a5%87%e0%a4%82-%e0%a4%ae%e0%a4%a8%e0%a4%be%e0%a4%af%e0%a4%be-%e0%a4%ac%e0%a4%be","url": "https://sikarsandesh.com/index.php/2019/11/19/%e0%a4%95%e0%a4%bf%e0%a4%a1%e0%a4%bc%e0%a4%9c%e0%a4%bc%e0%a5%80-%e0%a4%b8%e0%a5%80%e0%a4%95%e0%a4%b0-%e0%a4%ae%e0%a5%87%e0%a4%82-%e0%a4%ae%e0%a4%a8%e0%a4%be%e0%a4%af%e0%a4%be-%e0%a4%ac%e0%a4%be/","status": "publish","title": "किड़ज़ी सीकर में मनाया बालदिवस।","title_plain": "किड़ज़ी सीकर में मनाया बालदिवस।","content": "","excerpt": "सीकर के किड़ज़ी स्कूल में बाल दिवस को हर्षोल्लास के साथ मनाया गया। इस अवसर पर बच्चों ने विभिन्न मनोरंजक और खेल-कूद की गतिविधियों में भाग लिया जैसे म्यूज़िकल चेयर,बलून रेस,जलेबी रेस,फ़्री डाँस आदि। बच्चों को स्कूल की और से उपहार भी भेंट किए गए तथा उन्हें पंडित जवाहरलाल नेहरू के जीवन &hellip;","date": "2019-11-19 10:32:55","modified": "2019-11-19 10:34:46","categories": [],"tags": [],"author": {
        "id": 2,"slug": "adminsikarsandesh-com","name": "admin@sikarsandesh.com","first_name": "","last_name": "","nickname": "admin@sikarsandesh.com","url": "","description": ""
    },"comments": [],"attachments": [
        {
            "id": 17,"url": "https://sikarsandesh.com/wp-content/uploads/2019/11/sikarimg.jpg","slug": "sikarimg","title": "sikarimg","description": "","caption": "","parent": 16,"mime_type": "image/jpeg","images": {
                "full": {
                    "url": "https://sikarsandesh.com/wp-content/uploads/2019/11/sikarimg.jpg","width": 960,"height": 640
                },"thumbnail": {
                    "url": "https://sikarsandesh.com/wp-content/uploads/2019/11/sikarimg-150x150.jpg","width": 150,"height": 150
                },"medium": {
                    "url": "https://sikarsandesh.com/wp-content/uploads/2019/11/sikarimg-300x200.jpg","width": 300,"height": 200
                },"medium_large": {
                    "url": "https://sikarsandesh.com/wp-content/uploads/2019/11/sikarimg-768x512.jpg","width": 768,"height": 512
                },"woohoo-small": {
                    "url": "https://sikarsandesh.com/wp-content/uploads/2019/11/sikarimg-104x74.jpg","width": 104,"height": 74
                },"woohoo-large": {
                    "url": "https://sikarsandesh.com/wp-content/uploads/2019/11/sikarimg-850x491.jpg","width": 850,"height": 491
                },"woohoo-full": {
                    "url": "https://sikarsandesh.com/wp-content/uploads/2019/11/sikarimg-960x540.jpg","height": 540
                },"woohoo-widget": {
                    "url": "https://sikarsandesh.com/wp-content/uploads/2019/11/sikarimg-320x220.jpg","width": 320,"height": 220
                },"bdaia-carousel": {
                    "url": "https://sikarsandesh.com/wp-content/uploads/2019/11/sikarimg-309x330.jpg","width": 309,"height": 330
                },"bdaia-gallery-grid": {
                    "url": "https://sikarsandesh.com/wp-content/uploads/2019/11/sikarimg-850x567.jpg","height": 567
                },"bdaia-gr1": {
                    "url": "https://sikarsandesh.com/wp-content/uploads/2019/11/sikarimg-742x490.jpg","width": 742,"height": 490
                },"bdaia-gr2": {
                    "url": "https://sikarsandesh.com/wp-content/uploads/2019/11/sikarimg-496x244.jpg","width": 496,"height": 244
                },"bdaia-gr3": {
                    "url": "https://sikarsandesh.com/wp-content/uploads/2019/11/sikarimg-618x260.jpg","width": 618,"height": 260
                },"bdaia-gr4": {
                    "url": "https://sikarsandesh.com/wp-content/uploads/2019/11/sikarimg-413x244.jpg","width": 413,"bdaia-small": {
                    "url": "https://sikarsandesh.com/wp-content/uploads/2019/11/sikarimg-104x74.jpg","bdaia-large": {
                    "url": "https://sikarsandesh.com/wp-content/uploads/2019/11/sikarimg-850x491.jpg","bdaia-full": {
                    "url": "https://sikarsandesh.com/wp-content/uploads/2019/11/sikarimg-960x540.jpg","bdaia-widget": {
                    "url": "https://sikarsandesh.com/wp-content/uploads/2019/11/sikarimg-320x220.jpg","bdaia-block11": {
                    "url": "https://sikarsandesh.com/wp-content/uploads/2019/11/sikarimg-384x220.jpg","width": 384,"woocommerce_thumbnail": {
                    "url": "https://sikarsandesh.com/wp-content/uploads/2019/11/sikarimg-300x300.jpg","height": 300
                },"woocommerce_single": {
                    "url": "https://sikarsandesh.com/wp-content/uploads/2019/11/sikarimg-600x400.jpg","width": 600,"height": 400
                },"woocommerce_gallery_thumbnail": {
                    "url": "https://sikarsandesh.com/wp-content/uploads/2019/11/sikarimg-100x100.jpg","width": 100,"height": 100
                },"shop_catalog": {
                    "url": "https://sikarsandesh.com/wp-content/uploads/2019/11/sikarimg-300x300.jpg","shop_single": {
                    "url": "https://sikarsandesh.com/wp-content/uploads/2019/11/sikarimg-600x400.jpg","shop_thumbnail": {
                    "url": "https://sikarsandesh.com/wp-content/uploads/2019/11/sikarimg-100x100.jpg","height": 100
                }
            }
        }
    ],"comment_count": 0,"comment_status": "open","thumbnail": "https://sikarsandesh.com/wp-content/uploads/2019/11/sikarimg-150x150.jpg","shop_thumbnail": {
            "url": "https://sikarsandesh.com/wp-content/uploads/2019/11/sikarimg-100x100.jpg","height": 100
        }
    }
},

}

在某些情况下，我没有获得如何处理此图像字段的缩略图字段

最后我已经做到了：

                    if ( jsonResult.has("thumbnail")) {
                        imageUrl  = jsonResult.getString("thumbnail");
                        Glide.with(getapplicationContext()).load(imageUrl).into(imageView);

                    } else {
                        Toast.makeText(getapplicationContext(),Toast.LENGTH_SHORT).show();
                        Glide.with(getapplicationContext()).load(R.drawable.sikarlogo).into(imageView);
                    }

cjwszb 回答：如何检查REST API在响应中不包含图像字段？

尝试此方法

public String checkIfNull(JsonElement element) {
        return (element instanceof JsonNull) ? "" : element.getAsString();
    }

并像这样调用此方法

thumbnail = checkIfNull(jsonResult.getString("thumbnail")

如果为空，则在使用 Gson

时会为您提供空字符串

，如果您使用的是 JSONObject ，则可以使用opt进行检查

thumbnail = jsonResult.optString("thumbnail"," ")

使用此按钮检查密钥是否可用

 if(jsonResult.hasKey("thumbnail"){
 if ( jsonResult.getString("thumbnail")== null) {
                    Toast.makeText(getApplicationContext(),"No Image Exist",Toast.LENGTH_SHORT).show();
                    Glide.with(getApplicationContext()).load(R.drawable.sikarlogo).into(imageView);
                } else {
                    imageUrl  = jsonResult.getString("thumbnail");
                    Glide.with(getApplicationContext()).load(imageUrl).into(imageView);

                }

 }

他们有一种方法来检查JSON对象是否具有密钥，以便更好地处理这种情况。

jsonResult.has("thumbnail")

如果为true表示JSON具有密钥或false JSON对象没有密钥，则将返回true或false

首先，您必须检查“缩略图”键是否存在

 if (jsonResult.has("thumbnail")) {
String status = jsonResult.getString("thumbnail"));
}

您可以通过两种方式处理它-

使用has方法-

    if(jsonResult.has("thumbnail"){
    ..your logic
    }

使用isNull方法-

    if(!jsonResult.isNull("thumbnail"){
    ..thumnail key is not present
    }

您还可以使用optString method

返回通过名称映射的值（如果存在），如果存在则强制必要，如果没有这样的映射，则回退。

您可以使用jsonResult.getString("thumbnail") == null来检查响应是否具有缩略图键，而不必编写jsonResult.has("thumbnail")，然后根据需要进行进一步处理。

android field response retrofit

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如何检查REST API在响应中不包含图像字段？

cjwszb 回答：如何检查REST API在响应中不包含图像字段？

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