多級JSON解析

Question

我正在寫多級json解析程序，並且能夠獲得第一級列表，但不能在顯示第一級列表項時顯示第二級列表。

總之，我列出了類別正在面臨的問題，當試圖列出挖掘類別的視頻。

我做這樣的事情：

Main Activity [Listing Categories] > Another Activity [Listing Videos] 

MainActivity.java：

static String NAME = "name"; 
static String THUMB = "thumb";  
............................. 
     try { 
      // Locate the array name in JSON 
      jsonarray = jsonobject.getJSONArray("categories"); 

      for (int i = 0; i < jsonarray.length(); i++) { 
       HashMap<String, String> map = new HashMap<String, String>(); 
       jsonobject = jsonarray.getJSONObject(i); 
       // Retrive JSON Objects 
       map.put("name", jsonobject.getString("name")); 
       map.put("thumb", jsonobject.getString("thumb")); 
       // Set the JSON Objects into the array 
       arraylist.add(map); 
      } 
     } catch (JSONException e) { 
      Log.e("Error", e.getMessage()); 
      e.printStackTrace(); 
     } 
     return null; 
    } 

MainAdapter.java：

 // Capture ListView item click 
     itemView.setOnClickListener(new OnClickListener() { 

      @Override 
      public void onClick(View arg0) { 
       // Get the position 
       resultp = data.get(position); 
       Intent intent = new Intent(context, AnotherActivity.class); 
       // Pass name 
       intent.putExtra("name", resultp.get(MainActivity.NAME)); 
       // Start AnotherActivity Class 
       context.startActivity(intent); 

      } 
     }); 
     return itemView; 
    } 

注：使用上面的代碼中得到分類清單

AnotherActivity.java-

static String THUMB = "thumb"; 
static String TITLE = "title"; 
static String SUBTITLE = "subtitle";  
static String DESCRIPTION = "description"; 
........................ 
      try { 
      // Locate the array name in JSON 
      jsonarray = jsonobject.getJSONArray("videos"); 

      for (int i = 0; i < jsonarray.length(); i++) { 
       HashMap<String, String> map = new HashMap<String, String>(); 
       jsonobject = jsonarray.getJSONObject(i); 
       final JSONArray sources = jsonobject.getJSONArray("sources"); 
       // Retrive JSON Objects 
       map.put("title", jsonobject.getString("title")); 
       map.put("thumb", jsonobject.getString("thumb")); 
       // Set the JSON Objects into the array 
       arraylist.add(map); 
      } 
     } catch (JSONException e) { 
      Log.e("Error", e.getMessage()); 
      e.printStackTrace(); 
     } 
     return null; 
    } 

的Manifest.xml： -

<activity android:name="com.example.zing.AnotherActivity" /> 

JSON：

{ 
    "categories": [ 
     { 
      "name": "Dev Events", 
      "thumb": "http://www.androidbegin.com/tutorial/flag/unitedstates.png", 
      "videos": [ 
       { 
        "sources": [ 
         "http://commondatastorage.googleapis.com/gtv_template_assets/IO2010-Keynote-day1.mp4" 
        ], 
        "thumb": "http://www.androidbegin.com/tutorial/flag/unitedstates.png", 
        "title": "2010 Day 1 Keynote", 
        "subtitle": "Dev Events", 
        "description": "IO2010 Keynote" 
       }, 
       { 
        "sources": [ 
         "http://commondatastorage.googleapis.com/gtv_template_assets/IO2010-Keynote-day2-android.mp4" 
        ], 
        "thumb": "http://www.androidbegin.com/tutorial/flag/russia.png", 
        "title": "2010 Day 2 Keynote", 
        "subtitle": "Dev Events", 
        "description": "IO2010 Keynote Android" 
       } 
      ] 
     }, 
     { 
      "name": "Technology", 
      "thumb": "http://www.androidbegin.com/tutorial/flag/russia.png", 
      "videos": [ 
       { 
        "sources": [ 
         "http://commondatastorage.googleapis.com/gtv_template_assets/CWS-HowTo.mp4" 
        ], 
        "thumb": "http://www.androidbegin.com/tutorial/flag/russia.png", 
        "title": "Uploading your App", 
        "subtitle": "Technology", 
        "description": "CWS HowTo" 
       }, 
       { 
        "sources": [ 
         "http://commondatastorage.googleapis.com/gtv_template_assets/CWS-GettingStarted.mp4" 
        ], 
        "thumb": "http://www.androidbegin.com/tutorial/flag/unitedstates.png", 
        "title": "Getting Started with Apps for the Chrome Web Store", 
        "subtitle": "Technology", 
        "description": "Arne Roomann-Kurrik" 
       } 
      ] 
     } 
    ] 
} 

Answer 1

您需要的JSON數組傳遞到另一個活動

然後

try 
    { 

     JSONArray jr = jb.getJSONArray("categories"); 
     for(int i=0;i<jr.length();i++) 
     { 
      JSONObject jb1 = jr.getJSONObject(i); 
      JSONArray jr1 = jb1.getJSONArray("videos"); 
      for(int j=0;j<jr1.length();j++) 
      { 
       JSONObject jb2 = jr1.getJSONObject(j); 
       String title =(String) jb2.get("title"); 
       String thumb = (String) jb2.getString("thumb"); 
       Log.i(".........",title); 
       Log.i(".........",thumb); 

      } 
     } 

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

日誌

02-25 02:00:38.192: I/.........(1194): 2010 Day 1 Keynote 
02-25 02:00:38.192: I/.........(1194): http://www.androidbegin.com/tutorial/flag/unitedstates.png 
02-25 02:00:38.202: I/.........(1194): 2010 Day 2 Keynote 
02-25 02:00:38.202: I/.........(1194): http://www.androidbegin.com/tutorial/flag/russia.png 
02-25 02:00:38.202: I/.........(1194): Uploading your App 
02-25 02:00:38.202: I/.........(1194): http://www.androidbegin.com/tutorial/flag/russia.png 
02-25 02:00:38.202: I/.........(1194): Getting Started with Apps for the Chrome Web Store 
02-25 02:00:38.212: I/.........(1194): http://www.androidbegin.com/tutorial/flag/unitedstates.png 

編輯;

MainActivity.java

ListView lv = (ListView) findViewById(R.id.listView1); 
    ArrayList<HashMap<String,String>> arraylist= new ArrayList<HashMap<String,String>>(); 

      try { 
       // Locate the array name in JSON 
       JSONObject jb= new JSONObject("your json"); 
       jsonarray = jb.getJSONArray("categories"); 

       for (int i = 0; i < jsonarray.length(); i++) { 
        HashMap<String, String> map = new HashMap<String, String>(); 
        JSONObject jsonobject = jsonarray.getJSONObject(i); 
        // Retrive JSON Objects 
        map.put("name", jsonobject.getString("name")); 
        map.put("thumb", jsonobject.getString("thumb")); 
        // Set the JSON Objects into the array 
        arraylist.add(map); 
       } 
      } catch (JSONException e) { 
       Log.e("Error", e.getMessage()); 
       e.printStackTrace(); 
      } 
      String[] from = { "name","thumb" }; 
      int[] to = { R.id.textView1,R.id.textView2 }; 
      ListAdapter adapter = new SimpleAdapter(this,arraylist,R.layout.njk,from,to); 
      lv.setAdapter(adapter); 
      lv.setOnItemClickListener(new OnItemClickListener() 
      { 
      @Override 
      public void onItemClick(AdapterView<?> arg0, View arg1, 
        int arg2, long arg3) { 

        JSONObject jb; 
        try { 
         Intent intent = new Intent(MainActivity.this,SecondActivity.class); 
         jb = jsonarray.getJSONObject(arg2); 
         intent.putExtra("key",jb.toString()); 
         startActivity(intent); 
        } catch (JSONException e) { 
         // TODO Auto-generated catch block 
         e.printStackTrace(); 
        } 



      } 
      }); 

SecondActivity.java

public class SecondActivity extends Activity { 

    ListView lv; 
    @Override 
    protected void onCreate(Bundle savedInstanceState) { 
     super.onCreate(savedInstanceState); 
     setContentView(R.layout.activity_second); 
     lv= (ListView) findViewById(R.id.listView1); 
     ArrayList<HashMap<String,String>> arraylist= new ArrayList<HashMap<String,String>>(); 
     try 
     { 
     String value = getIntent().getStringExtra("key"); 

     JSONObject jb = new JSONObject(value); 
     JSONArray jr = jb.getJSONArray("videos"); 
     for(int j=0;j<jr.length();j++) 
     { 
      HashMap<String,String> map = new HashMap<String,String>(); 
      JSONObject jb2 = jr.getJSONObject(j); 
      String title =(String) jb2.get("title"); 
      String thumb = (String) jb2.getString("thumb"); 
      map.put("title",title); 
      map.put("thumb",thumb); 
      Log.i(".........",title); 
      Log.i(".........",thumb); 
      arraylist.add(map); 

     } 
     }catch(Exception e) 
     { 
      e.printStackTrace(); 
     } 
     String[] from = { "title","thumb" }; 
     int[] to = { R.id.textView1,R.id.textView2 }; 
     ListAdapter adapter = new SimpleAdapter(this,arraylist,R.layout.njk,from,to); 
     lv.setAdapter(adapter); 
    } 

njk.xml

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" 
    android:layout_width="fill_parent" 
    android:layout_height="fill_parent" > 

    <TextView 
     android:id="@+id/textView2" 
     android:layout_width="wrap_content" 
     android:layout_height="wrap_content" 
     android:layout_alignLeft="@+id/textView1" 
     android:layout_below="@+id/textView1" 
     android:layout_marginTop="26dp" 
     android:text="TextView" /> 

    <TextView 
     android:id="@+id/textView1" 
     android:layout_width="wrap_content" 
     android:layout_height="wrap_content" 
     android:layout_alignParentLeft="true" 
     android:layout_alignParentTop="true" 
     android:layout_marginTop="28dp" 
     android:text="TextView" /> 

</RelativeLayout> 

activity_main.xml中

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" 
    xmlns:tools="http://schemas.android.com/tools" 
    android:layout_width="match_parent" 
    android:layout_height="match_parent" 
    tools:context=".MainActivity" > 

    <ListView 
     android:id="@+id/listView1" 
     android:layout_width="match_parent" 
     android:layout_height="wrap_content" 
     android:layout_alignParentLeft="true" 
     android:layout_alignParentTop="true" > 
    </ListView> 

</RelativeLayout> 

activity_second.xml

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" 
    xmlns:tools="http://schemas.android.com/tools" 
    android:layout_width="match_parent" 
    android:layout_height="match_parent" 
    android:paddingBottom="@dimen/activity_vertical_margin" 
    android:paddingLeft="@dimen/activity_horizontal_margin" 
    android:paddingRight="@dimen/activity_horizontal_margin" 
    android:paddingTop="@dimen/activity_vertical_margin" 
    tools:context=".SecondActivity" > 

    <ListView 
     android:id="@+id/listView1" 
     android:layout_width="match_parent" 
     android:layout_height="wrap_content" 
     android:layout_alignParentLeft="true" 
     android:layout_alignParentTop="true" > 
    </ListView> 

</RelativeLayout> 

捕捉