GridView是給NullPointerException

我在gridview中顯示數據。但它給了我nullpointerexception。當我不顯示數據通過GridView是給NullPointerException

oid.setText(sdata.getOid()); then it is giving me values and not any exception.

但是，當我希望在textview中顯示數據。它給了我一個空指針異常。

這是代碼： -

griddata gdata = new griddata(search.this,R.layout.griditem,r); 
gridview.setAdapter(gdata); 

public class griddata extends ArrayAdapter<searchdata> 
{ 
Context context; 
private ArrayList<searchdata> items; 

public griddata(Context context, int textViewResourceId, ArrayList<searchdata> items) { 
    super(context, textViewResourceId, items); 
    this.items = items; 
} 

@Override 
public int getCount() 
    { 
//return numbers of element u want on the grid 
    return items.size(); 
} 

@Override 
public View getView(int position, View convertView, ViewGroup parent) 
    { 
    View v; 
    if (convertView == null) { 
     LayoutInflater vi = (LayoutInflater)getSystemService(Context.LAYOUT_INFLATER_SERVICE); 
     v = new View(context); 
     v = vi.inflate(R.layout.griditem, null); 
    } else 
    { 
     v = convertView; 
    } 

    searchdata sdata = items.get(position); 
    System.out.println("The data is "+sdata.getOid()); 
    if(sdata != null) 
    { 

    TextView oid = (TextView) findViewById(R.id.oid); 
    oid.setText(sdata.getOid()); 
/* TextView odate = (TextView) findViewById(R.id.odate); 
    TextView osdate = (TextView) findViewById(R.id.osdate); 
    TextView semail = (TextView) findViewById(R.id.semail); 
    TextView ssaddress = (TextView) findViewById(R.id.ssaddress); 
    TextView shipzip = (TextView) findViewById(R.id.shipzip); 
    TextView scost = (TextView) findViewById(R.id.scost); 
    TextView noofi = (TextView) findViewById(R.id.noofi); 
    TextView noofc = (TextView) findViewById(R.id.noofc); 
    TextView handfee = (TextView) findViewById(R.id.handfee); 

    oid.setText(sdata.getOid()); 
    /*odate.setText(sdata.getOdate()); 
    osdate.setText(sdata.getOsdate()); 
    semail.setText(sdata.getSemail()); 
    ssaddress.setText(sdata.getSsaddress()); 
    shipzip.setText(sdata.getSzip()); 
    scost.setText(sdata.getScost()); 
    noofi.setText(sdata.getNoofi()); 
    noofc.setText(sdata.getNoofc()); 
    handfee.setText(sdata.getHannlgfee());*/ 

    } 

    return v;} 

@Override 
public searchdata getItem(int arg0) { 

    return items.get(arg0); 
} 

@Override 
public long getItemId(int arg0) { 
// TODO Auto-generated method stub 
return arg0;} }

和我getitem.xml： -

<?xml version="1.0" encoding="utf-8"?> 
<ScrollView 
xmlns:android="http://schemas.android.com/apk/res/android" 
android:layout_width="fill_parent" 
android:layout_height="fill_parent" 
android:fillViewport="true"> 
    <LinearLayout 
     android:id="@+id/header" 
     android:layout_width="wrap_content" 
     android:layout_height="wrap_content" 
     android:gravity="center" 
     android:paddingBottom="5dip" 
     android:paddingTop="5dip" 
     android:orientation="horizontal"> 

       <TextView 
     android:id="@+id/oid" 
     android:layout_width="wrap_content" 
     android:layout_height="wrap_content" 


     android:layout_marginLeft="17dp" 
     android:text="TextView" /> 

       <TextView 
     android:id="@+id/odate" 
     android:layout_width="wrap_content" 
     android:layout_height="wrap_content" 


     android:layout_marginLeft="17dp" 
     android:text="TextView" /> 

        <TextView 
     android:id="@+id/osdate" 
     android:layout_width="wrap_content" 
     android:layout_height="wrap_content" 

     android:layout_marginLeft="17dp" 
     android:text="TextView" /> 

        <TextView 
     android:id="@+id/semail" 
     android:layout_width="wrap_content" 
     android:layout_height="wrap_content" 

     android:layout_marginLeft="17dp" 
     android:text="TextView" /> 

        <TextView 
     android:id="@+id/ssaddress" 
     android:layout_width="wrap_content" 
     android:layout_height="wrap_content" 

     android:layout_marginLeft="17dp" 
     android:text="TextView" /> 

         <TextView 
     android:id="@+id/shipzip" 
     android:layout_width="wrap_content" 
     android:layout_height="wrap_content" 

     android:layout_marginLeft="17dp" 
     android:text="TextView" /> 

         <TextView 
     android:id="@+id/scost" 
     android:layout_width="wrap_content" 
     android:layout_height="wrap_content" 

     android:layout_marginLeft="17dp" 
     android:text="TextView" /> 

        <TextView 
     android:id="@+id/noofi" 
     android:layout_width="wrap_content" 
     android:layout_height="wrap_content" 

     android:layout_marginLeft="17dp" 
     android:text="TextView" /> 

        <TextView 
     android:id="@+id/noofc" 
     android:layout_width="wrap_content" 
     android:layout_height="wrap_content" 

     android:layout_marginLeft="17dp" 
     android:text="TextView" /> 

        <TextView 
     android:id="@+id/handfee" 
     android:layout_width="wrap_content" 
     android:layout_height="wrap_content" 

     android:layout_marginLeft="17dp" 
     android:text="TextView" /> 

    </LinearLayout>

05-15 15:58:48.646: E/AndroidRuntime(2500): java.lang.NullPointerException 
05-15 15:58:48.646: E/AndroidRuntime(2500):  at android.view.ViewConfiguration.get(ViewConfiguration.java:332) 
05-15 15:58:48.646: E/AndroidRuntime(2500):  at android.view.View.<init>(View.java:3236) 
05-15 15:58:48.646: E/AndroidRuntime(2500):  at com.example.ship2impress.search$griddata.getView(search.java:297) 
05-15 15:58:48.646: E/AndroidRuntime(2500):  at android.widget.AbsListView.obtainView(AbsListView.java:2271) 
05-15 15:58:48.646: E/AndroidRuntime(2500):  at android.widget.GridView.onMeasure(GridView.java:1030) 
05-15 15:58:48.646: E/AndroidRuntime(2500):  at android.view.View.measure(View.java:15172) 
05-15 15:58:48.646: E/AndroidRuntime(2500):  at android.widget.RelativeLayout.measureChildHorizontal(RelativeLayout.java:617) 
05-15 15:58:48.646: E/AndroidRuntime(2500):  at android.widget.RelativeLayout.onMeasure(RelativeLayout.java:399) 
05-15 15:58:48.646: E/AndroidRuntime(2500):  at android.view.View.measure(View.java:15172) 
05-15 15:58:48.646: E/AndroidRuntime(2500):  at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:4816) 
05-15 15:58:48.646: E/AndroidRuntime(2500):  at android.widget.FrameLayout.onMeasure(FrameLayout.java:310) 
05-15 15:58:48.646: E/AndroidRuntime(2500):  at android.view.View.measure(View.java:15172) 
05-15 15:58:48.646: E/AndroidRuntime(2500):  at android.widget.LinearLayout.measureVertical(LinearLayout.java:833) 
05-15 15:58:48.646: E/AndroidRuntime(2500):  at android.widget.LinearLayout.onMeasure(LinearLayout.java:574) 
05-15 15:58:48.646: E/AndroidRuntime(2500):  at android.view.View.measure(View.java:15172) 
05-15 15:58:48.646: E/AndroidRuntime(2500):  at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:4816) 
05-15 15:58:48.646: E/AndroidRuntime(2500):  at android.widget.FrameLayout.onMeasure(FrameLayout.java:310) 
05-15 15:58:48.646: E/AndroidRuntime(2500):  at com.android.internal.policy.impl.PhoneWindow$DecorView.onMeasure(PhoneWindow.java:2148) 
05-15 15:58:48.646: E/AndroidRuntime(2500):  at android.view.View.measure(View.java:15172) 
05-15 15:58:48.646: E/AndroidRuntime(2500):  at android.view.ViewRootImpl.performMeasure(ViewRootImpl.java:1850) 
05-15 15:58:48.646: E/AndroidRuntime(2500):  at android.view.ViewRootImpl.measureHierarchy(ViewRootImpl.java:1102) 
05-15 15:58:48.646: E/AndroidRuntime(2500):  at android.view.ViewRootImpl.performTraversals(ViewRootImpl.java:1275) 
05-15 15:58:48.646: E/AndroidRuntime(2500):  at android.view.ViewRootImpl.doTraversal(ViewRootImpl.java:1000) 
05-15 15:58:48.646: E/AndroidRuntime(2500):  at android.view.ViewRootImpl$TraversalRunnable.run(ViewRootImpl.java:4214) 
05-15 15:58:48.646: E/AndroidRuntime(2500):  at android.view.Choreographer$CallbackRecord.run(Choreographer.java:725) 
05-15 15:58:48.646: E/AndroidRuntime(2500):  at android.view.Choreographer.doCallbacks(Choreographer.java:555) 
05-15 15:58:48.646: E/AndroidRuntime(2500):  at android.view.Choreographer.doFrame(Choreographer.java:525) 
05-15 15:58:48.646: E/AndroidRuntime(2500):  at android.view.Choreographer$FrameDisplayEventReceiver.run(Choreographer.java:711) 
05-15 15:58:48.646: E/AndroidRuntime(2500):  at android.os.Handler.handleCallback(Handler.java:615) 
05-15 15:58:48.646: E/AndroidRuntime(2500):  at android.os.Handler.dispatchMessage(Handler.java:92) 
05-15 15:58:48.646: E/AndroidRuntime(2500):  at android.os.Looper.loop(Looper.java:137) 
05-15 15:58:48.646: E/AndroidRuntime(2500):  at android.app.ActivityThread.main(ActivityThread.java:4745) 
05-15 15:58:48.646: E/AndroidRuntime(2500):  at java.lang.reflect.Method.invokeNative(Native Method) 
05-15 15:58:48.646: E/AndroidRuntime(2500):  at java.lang.reflect.Method.invoke(Method.java:511) 
05-15 15:58:48.646: E/AndroidRuntime(2500):  at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:786) 
05-15 15:58:48.646: E/AndroidRuntime(2500):  at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:553) 
05-15 15:58:48.646: E/AndroidRuntime(2500):  at dalvik.system.NativeStart.main(Native Method)

我認爲問題可能出在getitem.xml。請不要幫幫我。感謝您的時間。

來源

2013-05-15 user2160008

後堆棧跟蹤。 – njzk2

我假設你的適配器是一些活動的內部類。你調用findViewById這是一個活動的方法，因此搜索整個佈局。你必須打電話給v.findViewById – njzk2

@ njzk2 plz檢查日誌貓 – user2160008

改變這種

TextView oid = (TextView) findViewById(R.id.oid); 
oid.setText(sdata.getOid());

這個

TextView oid = (TextView) v.findViewById(R.id.oid); 
oid.setText(sdata.getOid());

來源

2013-05-15 10:26:23 bakriOnFire

謝謝。我錯了！ – user2160008

如果它解決你的問題..標記爲正確的，並關閉它.. – bakriOnFire

使用以下更改

public griddata(Context context, int textViewResourceId, ArrayList<searchdata> items) { 
super(context, textViewResourceId, items); 
this.items = items; 
this.context = context ;

}

在獲取視圖

if (convertView == null) { 
convertView = LayoutInflater.from(conetxt).inflate(R.layout.griditem, null); 
    }

和

 TextView oid = (TextView) convertView.findViewById(R.id.oid);

來源

2013-05-15 10:33:20

GridView是給NullPointerException

回答

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