如何检查 REST API 响应中不包含图像字段？
[英]How to check REST API does not contains Image Field in Response?
问题描述
I am using WordPress Rest API in that When a user does not upload image from WordPress backend it doest not contain that field and retrofit going in exception error like org.json.JSONException: No value for thumbnail when user upload image than I am getting response当响应没有缩略图字段时如何处理
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", "");
}
});
和我得到的回应：
{
"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 …",
"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",
"width": 960,
"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",
"width": 850,
"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,
"height": 244
},
"bdaia-small": {
"url": "https://sikarsandesh.com/wp-content/uploads/2019/11/sikarimg-104x74.jpg",
"width": 104,
"height": 74
},
"bdaia-large": {
"url": "https://sikarsandesh.com/wp-content/uploads/2019/11/sikarimg-850x491.jpg",
"width": 850,
"height": 491
},
"bdaia-full": {
"url": "https://sikarsandesh.com/wp-content/uploads/2019/11/sikarimg-960x540.jpg",
"width": 960,
"height": 540
},
"bdaia-widget": {
"url": "https://sikarsandesh.com/wp-content/uploads/2019/11/sikarimg-320x220.jpg",
"width": 320,
"height": 220
},
"bdaia-block11": {
"url": "https://sikarsandesh.com/wp-content/uploads/2019/11/sikarimg-384x220.jpg",
"width": 384,
"height": 220
},
"woocommerce_thumbnail": {
"url": "https://sikarsandesh.com/wp-content/uploads/2019/11/sikarimg-300x300.jpg",
"width": 300,
"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",
"width": 300,
"height": 300
},
"shop_single": {
"url": "https://sikarsandesh.com/wp-content/uploads/2019/11/sikarimg-600x400.jpg",
"width": 600,
"height": 400
},
"shop_thumbnail": {
"url": "https://sikarsandesh.com/wp-content/uploads/2019/11/sikarimg-100x100.jpg",
"width": 100,
"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",
"width": 100,
"height": 100
}
}
},
}
在某些情况下，我没有得到缩略图字段如何处理此图像字段
最后我这样做了：
if ( jsonResult.has("thumbnail")) {
imageUrl = jsonResult.getString("thumbnail");
Glide.with(getApplicationContext()).load(imageUrl).into(imageView);
} else {
Toast.makeText(getApplicationContext(), "No Image Exist", Toast.LENGTH_SHORT).show();
Glide.with(getApplicationContext()).load(R.drawable.sikarlogo).into(imageView);
}
6 个解决方案
解决方案1
1 2019-11-20 05:48:24
试试这个方法
public String checkIfNull(JsonElement element) {
return (element instanceof JsonNull) ? "" : element.getAsString();
}
并像这样调用这个方法
thumbnail = checkIfNull(jsonResult.getString("thumbnail")
如果它的 null，如果您使用Gson ，它将给您空字符串
如果您使用的是JSONObject ，那么您可以像这样使用 opt 进行检查
thumbnail = jsonResult.optString("thumbnail"," ")
解决方案2
1 2019-11-20 05:50:57
使用它来检查密钥是否可用
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);
}
}
解决方案3
1 2019-11-20 05:51:29
他们有办法检查 JSON object 是否有密钥，以便更好地处理这种情况。
jsonResult.has("thumbnail")
如果 true 表示 JSON 有密钥或 false JSON object 没有密钥，这将返回 true 或 false
解决方案4
1 2019-11-20 05:54:53
首先，您必须检查“缩略图”键是否存在
if (jsonResult.has("thumbnail")) {
String status = jsonResult.getString("thumbnail"));
}
解决方案5
1 2019-11-20 05:55:22
有两种方法可以处理它 -
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
}
您也可以使用optString 方法
如果存在，则返回按名称映射的值，必要时强制它，如果不存在此类映射，则回退。
解决方案6
1 2019-11-20 06:01:40
而不是写jsonResult.getString("thumbnail") == null您可以使用jsonResult.has("thumbnail")检查响应是否具有缩略图键，并根据需要进行进一步处理。
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