我正在尝试做一个向下钻取的导航应用程序。我有一张专辑名称列表。单击专辑时，它将打开该特定专辑的歌曲列表。问题是当我单击专辑时，它也会打开所有其他专辑的所有歌曲。
请帮忙。下面是我的编码。
相册 JSON:
[
{ "albumid": "1",
"name":"127 Hours",
"songs_count":"14"
},
{ "albumid": "2",
"name":"Adele 21",
"songs_count":"11"
},
{ "albumid": "3",
"name":"Lana Del Rey - Born to Die",
"songs_count":"12"
},
{ "albumid": "4",
"name":"Once",
"songs_count":"13"
},
{ "albumid": "5",
"name":"Away We Go",
"songs_count":"13"
},
{ "albumid": "6",
"name":"Eminem Curtain Call",
"songs_count":"14"
},
{ "albumid": "7",
"name":"Bad Meets Evil Eminem",
"songs_count":"11"
},
{ "albumid": "8",
"name":"Safe Trip Home",
"songs_count":"11"
},
{ "albumid": "9",
"name":"No Angel",
"songs_count":"12"
}
]
歌曲列表 JSON:
[
{
"albumid": "1",
"album": "127 Hours",
"songs": [
{
"id": "1",
"name": "Never Hear Surf Music Again",
"duration": "5:52"
},
{
"id": "2",
"name": "The Canyon",
"duration": "3:01"
},
{
"id": "3",
"name": "Liberation Begins",
"duration": "2:14"
},
{
"id": "4",
"name": "Touch of the Sun",
"duration": "4:39"
},
{
"id": "5",
"name": "Lovely Day",
"duration": "4:16"
},
{
"id": "6",
"name": "Ca Plane Pour Moi",
"duration": "3:00"
},
{
"id": "7",
"name": "Liberation In A Dream",
"duration": "4:06"
},
{
"id": "8",
"name": "If You Love Me (Really Love Me)",
"duration": "3:27"
},
{
"id": "9",
"name": "Acid Darbari",
"duration": "4:21"
},
{
"id": "10",
"name": "R.I.P.",
"duration": "5:11"
},
{
"id": "11",
"name": "Festival",
"duration": "9:26"
},
{
"id": "12",
"name": "If I Rise",
"duration": "4:38"
},
{
"id": "13",
"name": "Liberation",
"duration": "3:11"
},
{
"id": "14",
"name": "Nocturne No. 2 in E flat",
"duration": "4:01"
}
]
},
{
"albumid": "2",
"album": "Adele 21",
"songs": [
{
"id": "1",
"name": "Rolling In The Deep",
"duration": "03:48"
},
{
"id": "2",
"name": "Rumour Has It",
"duration": "03:43"
},
{
"id": "3",
"name": "Turning Tables",
"duration": "04:10"
},
{
"id": "4",
"name": "Don\u2019t You Remember",
"duration": "04:03"
},
{
"id": "5",
"name": "Set Fire To The Rain",
"duration": "04:02"
},
{
"id": "6",
"name": "He Won\u2019t Go",
"duration": "04:38"
},
{
"id": "7",
"name": "Take It All",
"duration": "03:48"
},
{
"id": "8",
"name": "I\u2019ll Be Waiting",
"duration": "04:01"
},
{
"id": "9",
"name": "One And Only",
"duration": "05:48"
},
{
"id": "10",
"name": "Lovesong",
"duration": "05:16"
},
{
"id": "11",
"name": "Someone Like You",
"duration": "04:45"
}
]
},
{
"albumid": "3",
"album": "Lana Del Rey - Born to Die",
"songs": [
{
"id": "1",
"name": "Born to Die",
"duration": "4:46"
},
{
"id": "2",
"name": "Off to the Races",
"duration": "5:00"
},
{
"id": "3",
"name": "Blue Jeans",
"duration": "3:29"
},
{
"id": "4",
"name": "Video Games",
"duration": "4:42"
},
{
"id": "5",
"name": "Diet Mountain Dew",
"duration": "3:43"
},
{
"id": "6",
"name": "National Anthem",
"duration": "3:51"
},
{
"id": "7",
"name": "Dark Paradise",
"duration": "4:03"
},
{
"id": "8",
"name": "Radio",
"duration": "3:35"
},
{
"id": 9,
"name": "Carmen",
"duration": "4:09"
},
{
"id": "10",
"name": "Million Dollar Man",
"duration": "3:50"
},
{
"id": "11",
"name": "Summertime Sadness",
"duration": "4:25"
},
{
"id": "12",
"name": "This Is What Makes Us Girls",
"duration": "4:00"
}
]
},
{
"albumid": "4",
"album": "Once",
"songs": [
{
"id": "1",
"name": "Falling Slowly",
"duration": "4:05"
},
{
"id": "2",
"name": "If You Want Me",
"duration": "3:47"
},
{
"id": "3",
"name": "Broken Hearted Hoover Fixer Sucker Guy",
"duration": "0:52"
},
{
"id": "4",
"name": "When Your Mind's Made Up",
"duration": "3:42"
},
{
"id": "5",
"name": "Lies",
"duration": "3:58"
},
{
"id": "6",
"name": "Gold",
"duration": "3:59"
},
{
"id": "7",
"name": "The Hill",
"duration": "4:34"
},
{
"id": "8",
"name": "Fallen From The Sky",
"duration": "3:24"
},
{
"id": "9",
"name": "Leave",
"duration": "2:46"
},
{
"id": "10",
"name": "Trying To Pull Myself Away",
"duration": "3:35"
},
{
"id": "11",
"name": "All The Way Down",
"duration": "2:38"
},
{
"id": "12",
"name": "Once",
"duration": "3:37"
},
{
"id": "13",
"name": "Say It To Me Now",
"duration": "2:36"
}
]
},
{
"albumid": "5",
"album": "Once",
"songs": [
{
"id": "1",
"name": "Falling Slowly",
"duration": "4:05"
},
{
"id": "2",
"name": "If You Want Me",
"duration": "3:47"
},
{
"id": "3",
"name": "Broken Hearted Hoover Fixer Sucker Guy",
"duration": "0:52"
},
{
"id": "4",
"name": "When Your Mind's Made Up",
"duration": "3:42"
},
{
"id": "5",
"name": "Lies",
"duration": "3:58"
},
{
"id": "6",
"name": "Gold",
"duration": "3:59"
},
{
"id": "7",
"name": "The Hill",
"duration": "4:34"
},
{
"id": "8",
"name": "Fallen From The Sky",
"duration": "3:24"
},
{
"id": "9",
"name": "Leave",
"duration": "2:46"
},
{
"id": "10",
"name": "Trying To Pull Myself Away",
"duration": "3:35"
},
{
"id": "11",
"name": "All The Way Down",
"duration": "2:38"
},
{
"id": "12",
"name": "Once",
"duration": "3:37"
},
{
"id": "13",
"name": "Say It To Me Now",
"duration": "2:36"
}
]
},
{
"albumid": "6",
"album": "Eminem Curtain Call",
"songs": [
{
"id": "1",
"name": "My Name Is",
"duration": "4:28"
},
{
"id": "2",
"name": "The Way I Am",
"duration": "4:51"
},
{
"id": "3",
"name": "Lose Yourself",
"duration": "5:21"
},
{
"id": "4",
"name": "Shake That",
"duration": "4:34"
},
{
"id": "5",
"name": "Sing For The Moment",
"duration": "5:40"
},
{
"id": "6",
"name": "Without Me",
"duration": "4:47"
},
{
"id": "7",
"name": "Like Toy Soldiers",
"duration": "4:51"
},
{
"id": "8",
"name": "The Real Slim Shady",
"duration": "4:44"
},
{
"id": "9",
"name": "Mockingbird",
"duration": "4:11"
},
{
"id": "10",
"name": "Guilty Conscience",
"duration": "3:19"
},
{
"id": "11",
"name": "Cleanin' Out My Closet",
"duration": "4:58"
},
{
"id": "12",
"name": "Just Lose It",
"duration": "4:08"
},
{
"id": "13",
"name": "When I'm Gone",
"duration": "4:40"
},
{
"id": "14",
"name": "Stan",
"duration": "6:21"
}
]
},
{
"albumid": "7",
"album": "Bad Meets Evil Eminem",
"songs": [
{
"id": "1",
"name": "Lighters",
"duration": "5:21"
},
{
"id": "2",
"name": "Fast Lane",
"duration": "3:19"
},
{
"id": "3",
"name": "Above the Law",
"duration": "6:21"
},
{
"id": "4",
"name": "Welcome 2 Hell",
"duration": "4:34"
},
{
"id": "5",
"name": "Take from Me",
"duration": "4:51"
},
{
"id": "6",
"name": "The Reunion",
"duration": "4:44"
},
{
"id": "7",
"name": "A Kiss",
"duration": "3:19"
},
{
"id": "8",
"name": "Echo",
"duration": "6:21"
},
{
"id": "9",
"name": "Lighters",
"duration": "4:40"
},
{
"id": "10",
"name": "Living Proof",
"duration": "3:49"
},
{
"id": "11",
"name": "Loud Noises",
"duration": "3:19"
}
]
},
{
"albumid": "8",
"album": "Safe Trip Home",
"songs": [
{
"id": "1",
"name": "Don't Believe in Love",
"duration": "3:52"
},
{
"id": "2",
"name": "Quiet Times",
"duration": "3:16"
},
{
"id": "3",
"name": "Never Want to Say It's Love",
"duration": "3:34"
},
{
"id": "4",
"name": "Grafton Street",
"duration": "5:56"
},
{
"id": "5",
"name": "It Comes And It Goes",
"duration": "3:26"
},
{
"id": "6",
"name": "Look No Further",
"duration": "3:15"
},
{
"id": "7",
"name": "Us 2 Little Gods",
"duration": "4:48"
},
{
"id": "8",
"name": "The Day Before The Day",
"duration": "4:12"
},
{
"id": "9",
"name": "Let's Do the Things We Normally Do",
"duration": "4:08"
},
{
"id": "10",
"name": "Burnin Love",
"duration": "4:10"
},
{
"id": "11",
"name": "Northern Skies",
"duration": "8:53"
}
]
},
{
"albumid": "9",
"album": "No Angel",
"songs": [
{
"id": "1",
"name": "Here With Me",
"duration": "4:05"
},
{
"id": "2",
"name": "Hunter",
"duration": "3:55"
},
{
"id": "3",
"name": "Don't Think Of Me",
"duration": "4:32"
},
{
"id": "4",
"name": "My Lover's Gone",
"duration": "4:27"
},
{
"id": "5",
"name": "All You Want",
"duration": "3:53"
},
{
"id": "6",
"name": "Thank You",
"duration": "3:36"
},
{
"id": "7",
"name": "Honestly Ok",
"duration": "4:37"
},
{
"id": "8",
"name": "Slide",
"duration": "4:50"
},
{
"id": "9",
"name": "Isobel",
"duration": "3:55"
},
{
"id": "10",
"name": "I'm No Angel",
"duration": "3:55"
},
{
"id": "11",
"name": "My Life",
"duration": "2:59"
},
{
"id": "12",
"name": "Take My Hand",
"duration": "6:50"
}
]
}
]
AlbumsActivity.java:
protected String doInBackground(String... args) {
// Building Parameters
List<NameValuePair> params = new ArrayList<NameValuePair>();
// getting JSON string from URL
String json = jsonParser.makeHttpRequest(URL_ALBUMS, "GET",
params);
// Check your log cat for JSON reponse
Log.d("Albums JSON: ", "> " + json);
try {
albums = new JSONArray(json);
if (albums != null) {
// looping through All albums
for (int i = 0; i < albums.length(); i++) {
JSONObject c = albums.getJSONObject(i);
// Storing each json item values in variable
String id = c.getString(TAG_ID);
String name = c.getString(TAG_NAME);
String songs_count = c.getString(TAG_SONGS_COUNT);
// creating new HashMap
HashMap<String, String> map = new HashMap<String, String>();
// adding each child node to HashMap key => value
map.put(TAG_ID, id);
map.put(TAG_NAME, name);
map.put(TAG_SONGS_COUNT, songs_count);
// adding HashList to ArrayList
albumsList.add(map);
}
}else{
Log.d("Albums: ", "null");
}
} catch (JSONException e) {
e.printStackTrace();
}
return null;
}
TrackListActivity.java:
protected String doInBackground(String... args) {
// Building Parameters
List<NameValuePair> params = new ArrayList<NameValuePair>();
// post album id as GET parameter
params.add(new BasicNameValuePair(TAG_ALBUM_ID, album_id));
// getting JSON string from URL
String json = jsonParser.makeHttpRequest(URL_ALBUMS, "GET",
params);
// Check your log cat for JSON reponse
Log.d("Track List JSON: ", json);
try {
albumtracks = new JSONArray(json);
if (albumtracks != null) {
for (int i = 0; i < albumtracks.length(); i++) {
JSONObject jObj = albumtracks.getJSONObject(i);
String album_id = jObj.getString(TAG_ALBUM_ID);
album_name = jObj.getString(TAG_ALBUM);
albums = jObj.getJSONArray(TAG_SONGS);
if (albums != null) {
// looping through All songs
for (int j = 0; j < albums.length(); j++) {
JSONObject c = albums.getJSONObject(j);
// Storing each json item in variable
String song_id = c.getString(TAG_SONG_ID);
// track no - increment i value
String track_no = String.valueOf(j + 1);
String name = c.getString(TAG_NAME);
String duration = c.getString(TAG_DURATION);
// creating new HashMap
HashMap<String, String> map = new HashMap<String, String>();
// adding each child node to HashMap key => value
map.put(TAG_ALBUM_ID, album_id);
map.put(TAG_SONG_ID, song_id);
map.put("track_no", track_no + ".");
map.put(TAG_NAME, name);
map.put(TAG_DURATION, duration);
// adding HashList to ArrayList
tracksList.add(map);
}
} else {
Log.d("Albums: ", "null");
}
}
}
} catch (JSONException e) {
e.printStackTrace();
}
return null;
}
仅供引用，我希望不用 PHP 也能做到这一点。 预先感谢您!
最佳答案
说实话，看看你的代码，我认为构建应用程序的最佳方法是拥有一个结构，而不是使用一些不同的 map :
public AlbumListing {
private String albumTitle
private String albumArtist
private HashMap<String, String> trackList = new HashMap<String, String>();
}
然后它有 getter 和 setter 来创建你的相册。然后，您可以拥有 AlbumListing 的 ArrayList:
ArrayList<AlbumListing> albumList = new ArrayList<AlbumListing>();
当您解析较高级别的信息(专辑标题和艺术家)时，首次创建新条目，当您解析较低级别的信息时，您可以搜索正确的艺术家条目，然后添加歌曲到条目的“trackList”中的私有(private) HashMap
像这样存储 JSON 结果会将一张专辑的所有数据保存在一起，而不必筛选两个 HashMap 来查找您需要的歌曲。我有一种感觉，如果您像这样构建数据，那么显示数据时遇到的问题就会消失，因为您将能够准确地看到您想要的数据所在的位置。
关于java - 无法解析复杂的 json，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/18734799/