はGSON

Question

を使用して、複雑なJSONモデルを作成しますので、私は、このJSONを得た：

：このJSONのため

{ "games": [ 
{ 
    "location": "germany", 
    "team1": { 
    "name": "test1", 
    "tore": "2" 
    }, 
    "team2": { 
    "name": "test2", 
    "tore": "3" 
    } 
},... 

私のモデルクラスは、（私はエラーを得たと考えている）

モデルクラスのように見えます

import com.google.gson.annotations.SerializedName; public class GameModel { public String location; @SerializedName("team1") public Team team1; @SerializedName("team2") public Team team2; public String getLocation() { return zeitpunkt; } public void setLocation(String location) { this.location= location; } class Team public String name; public String tore; public String getName() { return name; } public void setName(String name) { this.name = name; } public String getTore() { return tore; } public void setTore(String tore) { this.tore = tore; } @Override public String toString() { return "Team{" + name='" + name + '\'' + ", tore='" + tore + '\'' + '}'; } } 

そして、私のGSONはそのように見えます。..

のGSONクラス

JSONObject parentObject = new JSONObject(finalJson); 
JSONArray parentArray = parentObject.getJSONArray("games"); 

gameModelList = new ArrayList<>(); 

Gson gson2 = new Gson(); 
for(int i=0; i<parentArray.length(); i++) { 
    JSONObject finalObject = parentArray.getJSONObject(i); 
    GameModel inputGame = gson2.fromJson(finalObject.toString(), GameModel.class);  
    gameModelList.add(inputGame); 
} 
return gameModelList.toString(); 

私は私のCustomAdapterクラスで呼び出しますが、毎回私はjava.null.lang pointer exception 私も試した取得

GameModel gm = getItem(position); 
tvTeamOne.setText("" +gm.team1.getName()); 

ようteam1の名前を取得したいgames作品から私の場所デバッガを起動すると、が表示されますので、彼には届きません。String

logcat：

07-04 13:26:53.720 25600-25600/de.xxxxxxx.app.mc.xxxxxx E/AndroidRuntime: FATAL EXCEPTION: main 
    java.lang.NullPointerException 
    at de.xxxxx.app.mc.xxxxx.GameAdapter.getView(GameAdapter.java:40) 
    at android.widget.AbsListView.obtainView(AbsListView.java) 
    at android.widget.ListView.measureHeightOfChildren(ListView.java) 
    at android.widget.ListView.onMeasure(ListView.java) 
    at android.view.View.measure(View.java) 
    at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java) 
    at android.widget.LinearLayout.measureChildBeforeLayout(LinearLayout.java) 
    at android.widget.LinearLayout.measureVertical(LinearLayout.java) 
    at android.widget.LinearLayout.onMeasure(LinearLayout.java) 
    at android.view.View.measure(View.java) 
    at android.widget.RelativeLayout.measureChildHorizontal(RelativeLayout.java) 
    at android.widget.RelativeLayout.onMeasure(RelativeLayout.java) 
    at android.view.View.measure(View.java) 
    at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java) 
    at android.widget.FrameLayout.onMeasure(FrameLayout.java) 
    at android.view.View.measure(View.java) 
    at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java) 
    at android.widget.LinearLayout.measureChildBeforeLayout(LinearLayout.java) 
    at android.widget.LinearLayout.measureVertical(LinearLayout.java) 
    at android.widget.LinearLayout.onMeasure(LinearLayout.java) 
    at android.view.View.measure(View.java) 
    at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java) 
    at android.widget.FrameLayout.onMeasure(FrameLayout.java) 
    at com.android.internal.policy.impl.PhoneWindow$DecorView.onMeasure(PhoneWindow.java) 
    at android.view.View.measure(View.java) 
    at android.view.ViewRootImpl.performMeasure(ViewRootImpl.java) 
    at android.view.ViewRootImpl.measureHierarchy(ViewRootImpl.java) 
    at android.view.ViewRootImpl.performTraversals(ViewRootImpl.java) 
    at android.view.ViewRootImpl.doTraversal(ViewRootImpl.java) 
    at android.view.ViewRootImpl$TraversalRunnable.run(ViewRootImpl.java) 
    at android.view.Choreographer$CallbackRecord.run(Choreographer.java) 
    at android.view.Choreographer.doCallbacks(Choreographer.java) 
    at android.view.Choreographer.doFrame(Choreographer.java) 
    at android.view.Choreographer$FrameDisplayEventReceiver.run(Choreographer.java) 
    at android.os.Handler.handleCallback(Handler.java) 
    at android.os.Handler.dispatchMessage(Handler.java) 
    at android.os.Looper.loop(Looper.java) 
    at android.app.ActivityThread.main(ActivityThread.java) 
    at java.lang.reflect.Method.invokeNative(Native Method) 
    at java.lang.reflect.Method.invoke(Method.java) 
    at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java) 
    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java) 
    at dalvik.system.NativeStart.main(Native Method) 

Answer 1

最初のモデルを作成：

public class Team1 
{ 
    public String name; 
    public String tore; 
} 

public class Team2 
{ 
    public String name; 
    public String tore; 
} 

public class Game 
{ 
    public String location; 
    public Team1 team1; 
    public Team2 team2; 
} 

public class YourRootObject 
{ 
    public List<Game> games; 
} 

その後、オブジェクトへの簡単な解析：それが存在する場合は

Gson gson = new Gson(); 
try { 
    YourRootObject result = (YourRootObject) gson.fromJson(yourJson, YourRootObject.class); 
catch(Exception e){} 

と結果のすべてのデータ、適切に解析され、あなたが何のヌルを取得しません値

Answer 2

すべてのコードは無関係です。 "GameAdapter" getviewだけが必要です。また、 "getItem（position）"を呼び出しているので、私は思います

このようにこの方法を変更する必要があります。

public GameModel getItem(int position) { 
     return gameModelList.get(position); 
    } 

これが役に立ちます。