質問編集履歴
5
誤字の修正
test
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http://ax.itunes.apple.com/WebObjects/MZStoreServices.woa/ws/RSS/topfreeapplications/cc=us/limit=200/json
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のページを眺めたところ、"entry"が、"results"に当たりそうなので、その部分を変更し、rankingDataに"entry"の値を代入することができました。しかし、その後がうまくいきません。
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265
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のページを眺めたところ、"entry"が、"results"に当たりそうなので、その部分を変更し、rankingDataに"entry"の値を代入することができました。しかし、その後がうまくいきません。
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https://github.com/phi7/app_ranking/blob/main/lib/ranking_page.dart
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4
URLを新しいものに変更し、＃＃＃試したことに「追記②」をつけました。
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追記②
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おっしゃるとおり、urlの最後をxmlからjsonに変えたところ、
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feedData = data["feed"];
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print(feedData);
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までデータをとることができました。しかし、もとのコードとデータの取得先が違うのか"results"という項目がないためか、
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rankingData = feedData["results"];
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はうまくいきませんでした。
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そこで、取得したurl
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http://ax.itunes.apple.com/WebObjects/MZStoreServices.woa/ws/RSS/topfreeapplications/cc=us/limit=200/json
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264
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+
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265
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+
のページを眺めたところ、"entry"が、"results"に当たりそうなので、その部分を変更し、rankingDataに"entry"の値を代入することができました。しかし、その後がうまくいきません。もはや、この部分だけの問題ではなさそうなので以下にgithubを載せます。
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https://github.com/phi7/app_ranking/blob/main/lib/ranking_page.dart
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エラー内容
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```console
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275
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flutter: us
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276
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flutter: http://ax.itunes.apple.com/WebObjects/MZStoreServices.woa/ws/RSS/topfreeapplications/cc=us/limit=200/json
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278
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======== Exception caught by widgets library =======================================================
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The following _TypeError was thrown building RankingPage(dirty, state: _RankingPageState#5f572):
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type 'Null' is not a subtype of type 'String'
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287
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The relevant error-causing widget was:
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RankingPage file:///Users/nt/StudioProjects/app_ranking/lib/main.dart:18:13
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293
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When the exception was thrown, this was the stack:
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294
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+
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295
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#0 _RankingPageState.build (package:app_ranking/ranking_page.dart:177:44)
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296
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297
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#1 StatefulElement.build (package:flutter/src/widgets/framework.dart:4691:27)
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298
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+
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299
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+
#2 ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:4574:15)
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300
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+
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301
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+
#3 StatefulElement.performRebuild (package:flutter/src/widgets/framework.dart:4746:11)
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302
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+
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303
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#4 Element.rebuild (package:flutter/src/widgets/framework.dart:4267:5)
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304
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|
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305
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+
...
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306
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+
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307
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====================================================================================================
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308
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309
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flutter: Instance of 'Response'
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310
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flutter: {"feed":{"author":{"name":{"label":"iTunes Store"}, "uri":{"label":"http://www.apple.com/itunes/"}}, "entry":[
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312
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+
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313
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{"im:name":{"label":"TikTok"}, "im:image":[
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314
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315
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{"label":"https://is2-ssl.mzstatic.com/image/thumb/Purple125/v4/d5/f8/3e/d5f83ec1-8903-ba99-2605-ddc4ce0ecd51/AppIcon_TikTok-0-0-1x_U007emarketing-0-0-0-7-0-0-sRGB-0-0-0-GLES2_U002c0-512MB-85-220-0-0.png/53x53bb.png", "attributes":{"height":"53"}},
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316
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317
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{"label":"https://is1-ssl.mzstatic.com/image/thumb/Purple125/v4/d5/f8/3e/d5f83ec1-8903-ba99-2605-ddc4ce0ecd51/AppIcon_TikTok-0-0-1x_U007emarketing-0-0-0-7-0-0-sRGB-0-0-0-GLES2_U002c0-512MB-85-220-0-0.png/75x75bb.png", "attributes":{"height":"75"}},
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318
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319
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{"label":"https://is3-ssl.mzstatic.com/image/thumb/Purple125/v4/d5/f8/3e/d5f83ec1-8903-ba99-2605-ddc4ce0ecd51/AppIcon_TikTok-0-0-1x_U007emarketing-0-0-0-7-0-0-sRGB-0-0-0-GLES2_U002c0-512MB-85-220-0-0.png/100x100bb.png", "attributes":{"height":"100"}}], "summary":{"label":"TikTok is THE destination for mobile videos. On TikTok, short-form video<…>
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321
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flutter: 200
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322
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323
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flutter: {feed: {author: {name: {label: iTunes Store}, uri: {label: http://www.apple.com/itunes/}}, entry: [{im:name: {label: TikTok}, im:image: [{label: https://is2-ssl.mzstatic.com/image/thumb/Purple125/v4/d5/f8/3e/d5f83ec1-8903-ba99-2605-ddc4ce0ecd51/AppIcon_TikTok-0-0-1x_U007emarketing-0-0-0-7-0-0-sRGB-0-0-0-GLES2_U002c0-512MB-85-220-0-0.png/53x53bb.png, attributes: {height: 53}}, {label: https://is1-ssl.mzstatic.com/image/thumb/Purple125/v4/d5/f8/3e/d5f83ec1-8903-ba99-2605-ddc4ce0ecd51/AppIcon_TikTok-0-0-1x_U007emarketing-0-0-0-7-0-0-sRGB-0-0-0-GLES2_U002c0-512MB-85-220-0-0.png/75x75bb.png, attributes: {height: 75}}, {label: https://is3-ssl.mzstatic.com/image/thumb/Purple125/v4/d5/f8/3e/d5f83ec1-8903-ba99-2605-ddc4ce0ecd51/AppIcon_TikTok-0-0-1x_U007emarketing-0-0-0-7-0-0-sRGB-0-0-0-GLES2_U002c0-512MB-85-220-0-0.png/100x100bb.png, attributes: {height: 100}}], summary: {label: TikTok is THE destination for mobile videos. On TikTok, short-form videos are exciting, spontaneous, and genuine. Wh<…>
|
|
324
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+
|
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325
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+
flutter: {author: {name: {label: iTunes Store}, uri: {label: http://www.apple.com/itunes/}}, entry: [{im:name: {label: TikTok}, im:image: [{label: https://is2-ssl.mzstatic.com/image/thumb/Purple125/v4/d5/f8/3e/d5f83ec1-8903-ba99-2605-ddc4ce0ecd51/AppIcon_TikTok-0-0-1x_U007emarketing-0-0-0-7-0-0-sRGB-0-0-0-GLES2_U002c0-512MB-85-220-0-0.png/53x53bb.png, attributes: {height: 53}}, {label: https://is1-ssl.mzstatic.com/image/thumb/Purple125/v4/d5/f8/3e/d5f83ec1-8903-ba99-2605-ddc4ce0ecd51/AppIcon_TikTok-0-0-1x_U007emarketing-0-0-0-7-0-0-sRGB-0-0-0-GLES2_U002c0-512MB-85-220-0-0.png/75x75bb.png, attributes: {height: 75}}, {label: https://is3-ssl.mzstatic.com/image/thumb/Purple125/v4/d5/f8/3e/d5f83ec1-8903-ba99-2605-ddc4ce0ecd51/AppIcon_TikTok-0-0-1x_U007emarketing-0-0-0-7-0-0-sRGB-0-0-0-GLES2_U002c0-512MB-85-220-0-0.png/100x100bb.png, attributes: {height: 100}}], summary: {label: TikTok is THE destination for mobile videos. On TikTok, short-form videos are exciting, spontaneous, and genuine. Whether y<…>
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+
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327
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+
flutter: null
|
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328
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+
|
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329
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+
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330
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+
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331
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+
======== Exception caught by widgets library =======================================================
|
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332
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+
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333
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+
The following _TypeError was thrown building RankingPage(dirty, state: _RankingPageState#5f572):
|
|
334
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+
|
|
335
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+
type 'Null' is not a subtype of type 'String'
|
|
336
|
+
|
|
337
|
+
|
|
338
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+
|
|
339
|
+
The relevant error-causing widget was:
|
|
340
|
+
|
|
341
|
+
RankingPage file:///Users/nt/StudioProjects/app_ranking/lib/main.dart:18:13
|
|
342
|
+
|
|
343
|
+
When the exception was thrown, this was the stack:
|
|
344
|
+
|
|
345
|
+
#0 _RankingPageState.build (package:app_ranking/ranking_page.dart:177:44)
|
|
346
|
+
|
|
347
|
+
#1 StatefulElement.build (package:flutter/src/widgets/framework.dart:4691:27)
|
|
348
|
+
|
|
349
|
+
#2 ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:4574:15)
|
|
350
|
+
|
|
351
|
+
#3 StatefulElement.performRebuild (package:flutter/src/widgets/framework.dart:4746:11)
|
|
352
|
+
|
|
353
|
+
#4 Element.rebuild (package:flutter/src/widgets/framework.dart:4267:5)
|
|
354
|
+
|
|
355
|
+
...
|
|
356
|
+
|
|
357
|
+
====================================================================================================
|
|
358
|
+
|
|
359
|
+
Lost connection to device.
|
|
360
|
+
|
|
361
|
+
```
|
|
362
|
+
|
|
363
|
+
|
|
364
|
+
|
|
365
|
+
また、urlにcc="国名"を入れることで、各国のランキングがとれるようになるかと思いきや、どれも変わりませんでした。
|
|
366
|
+
|
|
367
|
+
http://ax.itunes.apple.com/WebObjects/MZStoreServices.woa/ws/RSS/topfreeapplications/limit=200/json
|
|
368
|
+
|
|
369
|
+
http://ax.itunes.apple.com/WebObjects/MZStoreServices.woa/ws/RSS/topfreeapplications/cc=us/limit=200/json
|
|
370
|
+
|
|
371
|
+
http://ax.itunes.apple.com/WebObjects/MZStoreServices.woa/ws/RSS/topfreeapplications/cc=jp/limit=200/json
|
|
372
|
+
|
|
373
|
+
データの取得方法と、各国のランキングのurlの発見方法についてご存知の方が教えていただけると嬉しいです。
|
3
teminal→console
test
CHANGED
|
File without changes
|
test
CHANGED
|
@@ -24,7 +24,7 @@
|
|
|
24
24
|
|
|
25
25
|
|
|
26
26
|
|
|
27
|
-
### print関数で
|
|
27
|
+
### print関数でconsoleに出力されたもの
|
|
28
28
|
|
|
29
29
|
|
|
30
30
|
|
|
@@ -194,7 +194,7 @@
|
|
|
194
194
|
|
|
195
195
|
|
|
196
196
|
|
|
197
|
-
```
|
|
197
|
+
```console
|
|
198
198
|
|
|
199
199
|
flutter: us
|
|
200
200
|
|
2
teminalの書式の改善
test
CHANGED
|
File without changes
|
test
CHANGED
|
@@ -194,7 +194,7 @@
|
|
|
194
194
|
|
|
195
195
|
|
|
196
196
|
|
|
197
|
-
|
|
197
|
+
```teminal
|
|
198
198
|
|
|
199
199
|
flutter: us
|
|
200
200
|
|
|
@@ -230,6 +230,8 @@
|
|
|
230
230
|
|
|
231
231
|
|
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232
232
|
|
|
233
|
+
```
|
|
234
|
+
|
|
233
235
|
とエラーがでるようになりました、、、
|
|
234
236
|
|
|
235
237
|
取得したurlのページを開くと頭に
|
1
URLを新しいものに変更し、＃＃＃試したことに「追記」をつけました。
test
CHANGED
|
File without changes
|
test
CHANGED
|
@@ -158,6 +158,90 @@
|
|
|
158
158
|
|
|
159
159
|
|
|
160
160
|
|
|
161
|
+
追記
|
|
162
|
+
|
|
163
|
+
おっしゃるとおりでURLが変わっていたようなので、新しいURLで試してみました。
|
|
164
|
+
|
|
165
|
+
（初期値は currentCode = 'us';
|
|
166
|
+
|
|
167
|
+
currentType = 'topfree';
|
|
168
|
+
|
|
169
|
+
currentGenre = 'applications';に）
|
|
170
|
+
|
|
171
|
+
|
|
172
|
+
|
|
173
|
+
```dart
|
|
174
|
+
|
|
175
|
+
String? currentTypeAndGenre = "$currentType$currentGenre";
|
|
176
|
+
|
|
177
|
+
var url = Uri.parse(
|
|
178
|
+
|
|
179
|
+
"http://ax.itunes.apple.com/WebObjects/MZStoreServices.woa/ws/RSS/$currentTypeAndGenre/cc=$currentCode/limit=200/xml");
|
|
180
|
+
|
|
181
|
+
print(url);
|
|
182
|
+
|
|
183
|
+
```
|
|
184
|
+
|
|
185
|
+
|
|
186
|
+
|
|
187
|
+
print(url)まではteminalに出力されましたが、その後の
|
|
188
|
+
|
|
189
|
+
http.Response response = await http.get(url);
|
|
190
|
+
|
|
191
|
+
print(response);
|
|
192
|
+
|
|
193
|
+
がうまくいかないようで
|
|
194
|
+
|
|
195
|
+
|
|
196
|
+
|
|
197
|
+
//termial
|
|
198
|
+
|
|
199
|
+
flutter: us
|
|
200
|
+
|
|
201
|
+
flutter: http://ax.itunes.apple.com/WebObjects/MZStoreServices.woa/ws/RSS/topfreeapplications/cc=us/limit=200/xml
|
|
202
|
+
|
|
203
|
+
======== Exception caught by widgets library =======================================================
|
|
204
|
+
|
|
205
|
+
The following _TypeError was thrown building RankingPage(dirty, state: _RankingPageState#aa6a8):
|
|
206
|
+
|
|
207
|
+
type 'Null' is not a subtype of type 'String'
|
|
208
|
+
|
|
209
|
+
|
|
210
|
+
|
|
211
|
+
The relevant error-causing widget was:
|
|
212
|
+
|
|
213
|
+
RankingPage file:///Users/nt/StudioProjects/app_ranking/lib/main.dart:18:13
|
|
214
|
+
|
|
215
|
+
When the exception was thrown, this was the stack:
|
|
216
|
+
|
|
217
|
+
#0 _RankingPageState.build (package:app_ranking/ranking_page.dart:177:44)
|
|
218
|
+
|
|
219
|
+
#1 StatefulElement.build (package:flutter/src/widgets/framework.dart:4691:27)
|
|
220
|
+
|
|
221
|
+
#2 ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:4574:15)
|
|
222
|
+
|
|
223
|
+
#3 StatefulElement.performRebuild (package:flutter/src/widgets/framework.dart:4746:11)
|
|
224
|
+
|
|
225
|
+
#4 Element.rebuild (package:flutter/src/widgets/framework.dart:4267:5)
|
|
226
|
+
|
|
227
|
+
...
|
|
228
|
+
|
|
229
|
+
====================================================================================================
|
|
230
|
+
|
|
231
|
+
|
|
232
|
+
|
|
233
|
+
とエラーがでるようになりました、、、
|
|
234
|
+
|
|
235
|
+
取得したurlのページを開くと頭に
|
|
236
|
+
|
|
237
|
+
This XML file does not appear to have any style information associated with it. The document tree is shown below.
|
|
238
|
+
|
|
239
|
+
と書いており、これが原因なのでしょうか？
|
|
240
|
+
|
|
241
|
+
なにかご存じの方がいたら教えていただけると嬉しいです。
|
|
242
|
+
|
|
243
|
+
|
|
244
|
+
|
|
161
245
|
### 補足情報（FW/ツールのバージョンなど）
|
|
162
246
|
|
|
163
247
|
dependencies:
|