質問編集履歴
5
誤字の修正
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@@ -130,8 +130,7 @@
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130
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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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132
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http://ax.itunes.apple.com/WebObjects/MZStoreServices.woa/ws/RSS/topfreeapplications/cc=us/limit=200/json
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133
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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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133
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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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エラー内容
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137
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```console
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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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@@ -121,13 +121,67 @@
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121
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と書いており、これが原因なのでしょうか？
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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。
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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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-
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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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129
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+
rankingData = feedData["results"];
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-
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130
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はうまくいきませんでした。
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-
flutter:
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-
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131
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そこで、取得したurl
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http: ^0.13.3
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-
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http://ax.itunes.apple.com/WebObjects/MZStoreServices.woa/ws/RSS/topfreeapplications/cc=us/limit=200/json
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133
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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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130
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-
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https://github.com/phi7/app_ranking/blob/main/lib/ranking_page.dart
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-
url_launcher: ^6.0.9
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-
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エラー内容
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137
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```console
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138
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flutter: us
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139
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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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140
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+
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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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143
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type 'Null' is not a subtype of type 'String'
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144
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+
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145
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+
The relevant error-causing widget was:
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146
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RankingPage file:///Users/nt/StudioProjects/app_ranking/lib/main.dart:18:13
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147
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When the exception was thrown, this was the stack:
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148
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#0 _RankingPageState.build (package:app_ranking/ranking_page.dart:177:44)
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149
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+
#1 StatefulElement.build (package:flutter/src/widgets/framework.dart:4691:27)
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150
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+
#2 ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:4574:15)
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151
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#3 StatefulElement.performRebuild (package:flutter/src/widgets/framework.dart:4746:11)
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152
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#4 Element.rebuild (package:flutter/src/widgets/framework.dart:4267:5)
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...
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154
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====================================================================================================
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flutter: Instance of 'Response'
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flutter: {"feed":{"author":{"name":{"label":"iTunes Store"}, "uri":{"label":"http://www.apple.com/itunes/"}}, "entry":[
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{"im:name":{"label":"TikTok"}, "im:image":[
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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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{"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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{"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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flutter: 200
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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<…>
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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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flutter: null
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165
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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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168
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type 'Null' is not a subtype of type 'String'
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169
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+
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The relevant error-causing widget was:
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171
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RankingPage file:///Users/nt/StudioProjects/app_ranking/lib/main.dart:18:13
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172
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When the exception was thrown, this was the stack:
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173
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#0 _RankingPageState.build (package:app_ranking/ranking_page.dart:177:44)
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174
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+
#1 StatefulElement.build (package:flutter/src/widgets/framework.dart:4691:27)
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175
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+
#2 ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:4574:15)
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176
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+
#3 StatefulElement.performRebuild (package:flutter/src/widgets/framework.dart:4746:11)
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177
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#4 Element.rebuild (package:flutter/src/widgets/framework.dart:4267:5)
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178
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+
...
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179
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====================================================================================================
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180
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+
Lost connection to device.
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181
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```
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182
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+
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183
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+
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。
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184
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http://ax.itunes.apple.com/WebObjects/MZStoreServices.woa/ws/RSS/topfreeapplications/limit=200/json
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185
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http://ax.itunes.apple.com/WebObjects/MZStoreServices.woa/ws/RSS/topfreeapplications/cc=us/limit=200/json
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186
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+
http://ax.itunes.apple.com/WebObjects/MZStoreServices.woa/ws/RSS/topfreeapplications/cc=jp/limit=200/json
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187
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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。
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3
teminal→console
title
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File without changes
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body
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@@ -11,7 +11,7 @@
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11
11
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12
12
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dataにしっかり値が代入されるようにしたいです。
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13
13
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14
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-
### print関数で
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14
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+
### print関数でconsoleに出力されたもの
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15
15
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|
|
16
16
|
```
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|
17
17
|
flutter: us
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|
@@ -96,7 +96,7 @@
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96
96
|
print(response);
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97
97
|
がうまくいかないようで
|
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98
98
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|
|
99
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-
```
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99
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+
```console
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|
100
100
|
flutter: us
|
|
101
101
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flutter: http://ax.itunes.apple.com/WebObjects/MZStoreServices.woa/ws/RSS/topfreeapplications/cc=us/limit=200/xml
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|
102
102
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======== Exception caught by widgets library =======================================================
|
2
teminalの書式の改善
title
CHANGED
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File without changes
|
body
CHANGED
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@@ -96,7 +96,7 @@
|
|
|
96
96
|
print(response);
|
|
97
97
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がうまくいかないようで
|
|
98
98
|
|
|
99
|
-
|
|
99
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+
```teminal
|
|
100
100
|
flutter: us
|
|
101
101
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flutter: http://ax.itunes.apple.com/WebObjects/MZStoreServices.woa/ws/RSS/topfreeapplications/cc=us/limit=200/xml
|
|
102
102
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======== Exception caught by widgets library =======================================================
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|
@@ -114,6 +114,7 @@
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|
|
114
114
|
...
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|
115
115
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====================================================================================================
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116
116
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117
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+
```
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|
117
118
|
とエラーがでるようになりました、、、
|
|
118
119
|
取得したurlのページを開くと頭に
|
|
119
120
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This XML file does not appear to have any style information associated with it. The document tree is shown below.
|
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。
title
CHANGED
|
File without changes
|
body
CHANGED
|
@@ -78,6 +78,48 @@
|
|
|
78
78
|
グーグルで 「response body null flutter」と検索して、下記のサイトに辿り着きましたが、そこでも解決されていないようです。
|
|
79
79
|
https://stackoverflow.com/questions/64942048/flutter-response-body-is-empty
|
|
80
80
|
|
|
81
|
+
追記
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|
82
|
+
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。
|
|
83
|
+
（初期値は currentCode = 'us';
|
|
84
|
+
currentType = 'topfree';
|
|
85
|
+
currentGenre = 'applications';に）
|
|
86
|
+
|
|
87
|
+
```dart
|
|
88
|
+
String? currentTypeAndGenre = "$currentType$currentGenre";
|
|
89
|
+
var url = Uri.parse(
|
|
90
|
+
"http://ax.itunes.apple.com/WebObjects/MZStoreServices.woa/ws/RSS/$currentTypeAndGenre/cc=$currentCode/limit=200/xml");
|
|
91
|
+
print(url);
|
|
92
|
+
```
|
|
93
|
+
|
|
94
|
+
print(url)まではteminalに出力されましたが、その後の
|
|
95
|
+
http.Response response = await http.get(url);
|
|
96
|
+
print(response);
|
|
97
|
+
がうまくいかないようで
|
|
98
|
+
|
|
99
|
+
//termial
|
|
100
|
+
flutter: us
|
|
101
|
+
flutter: http://ax.itunes.apple.com/WebObjects/MZStoreServices.woa/ws/RSS/topfreeapplications/cc=us/limit=200/xml
|
|
102
|
+
======== Exception caught by widgets library =======================================================
|
|
103
|
+
The following _TypeError was thrown building RankingPage(dirty, state: _RankingPageState#aa6a8):
|
|
104
|
+
type 'Null' is not a subtype of type 'String'
|
|
105
|
+
|
|
106
|
+
The relevant error-causing widget was:
|
|
107
|
+
RankingPage file:///Users/nt/StudioProjects/app_ranking/lib/main.dart:18:13
|
|
108
|
+
When the exception was thrown, this was the stack:
|
|
109
|
+
#0 _RankingPageState.build (package:app_ranking/ranking_page.dart:177:44)
|
|
110
|
+
#1 StatefulElement.build (package:flutter/src/widgets/framework.dart:4691:27)
|
|
111
|
+
#2 ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:4574:15)
|
|
112
|
+
#3 StatefulElement.performRebuild (package:flutter/src/widgets/framework.dart:4746:11)
|
|
113
|
+
#4 Element.rebuild (package:flutter/src/widgets/framework.dart:4267:5)
|
|
114
|
+
...
|
|
115
|
+
====================================================================================================
|
|
116
|
+
|
|
117
|
+
とエラーがでるようになりました、、、
|
|
118
|
+
取得したurlのページを開くと頭に
|
|
119
|
+
This XML file does not appear to have any style information associated with it. The document tree is shown below.
|
|
120
|
+
と書いており、これが原因なのでしょうか？
|
|
121
|
+
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。
|
|
122
|
+
|
|
81
123
|
### 補足情報（FW/ツールのバージョンなど）
|
|
82
124
|
dependencies:
|
|
83
125
|
flutter:
|