getpoint自定义适配器上的nullpointerexception

当我尝试显示数据库中的所有信息时，出现此异常。getpoint自定义适配器上的nullpointerexception

02-27 01:49:49.074: E/AndroidRuntime(1956): FATAL EXCEPTION: main 
02-27 01:49:49.074: E/AndroidRuntime(1956): java.lang.NullPointerException 
02-27 01:49:49.074: E/AndroidRuntime(1956):  at my.fyp.inticlassifieds.CustomAdapter.getView(CustomAdapter.java:86) 
02-27 01:49:49.074: E/AndroidRuntime(1956):  at android.widget.AbsListView.obtainView(AbsListView.java:2177) 
02-27 01:49:49.074: E/AndroidRuntime(1956):  at android.widget.ListView.measureHeightOfChildren(ListView.java:1247) 
02-27 01:49:49.074: E/AndroidRuntime(1956):  at android.widget.ListView.onMeasure(ListView.java:1159) 
02-27 01:49:49.074: E/AndroidRuntime(1956):  at android.view.View.measure(View.java:15848) 
02-27 01:49:49.074: E/AndroidRuntime(1956):  at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5012) 
02-27 01:49:49.074: E/AndroidRuntime(1956):  at android.widget.LinearLayout.measureChildBeforeLayout(LinearLayout.java:1404) 
02-27 01:49:49.074: E/AndroidRuntime(1956):  at android.widget.LinearLayout.measureVertical(LinearLayout.java:695) 
02-27 01:49:49.074: E/AndroidRuntime(1956):  at android.widget.LinearLayout.onMeasure(LinearLayout.java:588) 
02-27 01:49:49.074: E/AndroidRuntime(1956):  at android.view.View.measure(View.java:15848) 
02-27 01:49:49.074: E/AndroidRuntime(1956):  at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5012) 
02-27 01:49:49.074: E/AndroidRuntime(1956):  at android.widget.FrameLayout.onMeasure(FrameLayout.java:310) 
02-27 01:49:49.074: E/AndroidRuntime(1956):  at android.view.View.measure(View.java:15848) 
02-27 01:49:49.074: E/AndroidRuntime(1956):  at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5012) 
02-27 01:49:49.074: E/AndroidRuntime(1956):  at com.android.internal.widget.ActionBarOverlayLayout.onMeasure(ActionBarOverlayLayout.java:302) 
02-27 01:49:49.074: E/AndroidRuntime(1956):  at android.view.View.measure(View.java:15848) 
02-27 01:49:49.074: E/AndroidRuntime(1956):  at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5012) 
02-27 01:49:49.074: E/AndroidRuntime(1956):  at android.widget.FrameLayout.onMeasure(FrameLayout.java:310) 
02-27 01:49:49.074: E/AndroidRuntime(1956):  at com.android.internal.policy.impl.PhoneWindow$DecorView.onMeasure(PhoneWindow.java:2189) 
02-27 01:49:49.074: E/AndroidRuntime(1956):  at android.view.View.measure(View.java:15848) 
02-27 01:49:49.074: E/AndroidRuntime(1956):  at android.view.ViewRootImpl.performMeasure(ViewRootImpl.java:1905) 
02-27 01:49:49.074: E/AndroidRuntime(1956):  at android.view.ViewRootImpl.measureHierarchy(ViewRootImpl.java:1104) 
02-27 01:49:49.074: E/AndroidRuntime(1956):  at android.view.ViewRootImpl.performTraversals(ViewRootImpl.java:1284) 
02-27 01:49:49.074: E/AndroidRuntime(1956):  at android.view.ViewRootImpl.doTraversal(ViewRootImpl.java:1004) 
02-27 01:49:49.074: E/AndroidRuntime(1956):  at android.view.ViewRootImpl$TraversalRunnable.run(ViewRootImpl.java:5481) 
02-27 01:49:49.074: E/AndroidRuntime(1956):  at android.view.Choreographer$CallbackRecord.run(Choreographer.java:749) 
02-27 01:49:49.074: E/AndroidRuntime(1956):  at android.view.Choreographer.doCallbacks(Choreographer.java:562) 
02-27 01:49:49.074: E/AndroidRuntime(1956):  at android.view.Choreographer.doFrame(Choreographer.java:532) 
02-27 01:49:49.074: E/AndroidRuntime(1956):  at android.view.Choreographer$FrameDisplayEventReceiver.run(Choreographer.java:735) 
02-27 01:49:49.074: E/AndroidRuntime(1956):  at android.os.Handler.handleCallback(Handler.java:730) 
02-27 01:49:49.074: E/AndroidRuntime(1956):  at android.os.Handler.dispatchMessage(Handler.java:92) 
02-27 01:49:49.074: E/AndroidRuntime(1956):  at android.os.Looper.loop(Looper.java:137) 
02-27 01:49:49.074: E/AndroidRuntime(1956):  at android.app.ActivityThread.main(ActivityThread.java:5103) 
02-27 01:49:49.074: E/AndroidRuntime(1956):  at java.lang.reflect.Method.invokeNative(Native Method) 
02-27 01:49:49.074: E/AndroidRuntime(1956):  at java.lang.reflect.Method.invoke(Method.java:525) 
02-27 01:49:49.074: E/AndroidRuntime(1956):  at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:737) 
02-27 01:49:49.074: E/AndroidRuntime(1956):  at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:553) 
02-27 01:49:49.074: E/AndroidRuntime(1956):  at dalvik.system.NativeStart.main(Native Method)

这是我的自定义适配器类：

public class CustomAdapter extends BaseAdapter { 


private ArrayList<Products> m_productsList = null; 
private LayoutInflater mInflater = null; 

private class Row{ 
TextView mTextViewPID; 
TextView mTextViewName; 
TextView mTextViewPrice; 
} 


public CustomAdapter(Context context, ArrayList<Products> productsList){ 
this.mInflater = LayoutInflater.from(context); 
this.m_productsList = productsList; 

} 


// -------------------------------------------------- 
// BaseAdapter Overrides 
// -------------------------------------------------- 

@Override 
public int getCount() { 
int count = 0; 

if((m_productsList !=null) && (m_productsList.size() >= 1)){ 

    count = m_productsList.size(); 

} 

return count; 
} 

@Override 
public Object getItem(int position) { 
// TODO Auto-generated method stub 
return m_productsList.get(position); 
} 

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

@Override 
public View getView(int position, View convertView, ViewGroup parent) { 

Row theRow; 

// If ConvertVIew is null 
if(convertView == null){ 

    theRow = new Row(); 

    convertView = mInflater.inflate(R.layout.activity_display_requested, null); 

    theRow.mTextViewPID = (TextView) convertView.findViewById(R.id.pid); 
    theRow.mTextViewName = (TextView) convertView.findViewById(R.id.name); 
    theRow.mTextViewPrice = (TextView) convertView.findViewById(R.id.budget); 


    convertView.setTag(theRow); 

}else{ 

    theRow = (Row) convertView.getTag(); 
} 

theRow.mTextViewPID.setText(m_productsList.get(position).pid); 
theRow.mTextViewName.setText(m_productsList.get(position).name); 
theRow.mTextViewPrice.setText(m_productsList.get(position).price); 

return convertView; 
} 
}

抛出此异常的线路是：

theRow.mTextViewPID.setText(m_productsList.get(position).pid);

activity_display_requested XML

<?xml version="1.0" encoding="utf-8"?> 
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" 
android:layout_width="fill_parent" 
android:layout_height="fill_parent" 
android:orientation="vertical"> 

<ListView 
    android:id="@android:id/list" 
    android:layout_width="fill_parent" 
    android:layout_height="wrap_content"/> 

</LinearLayout>

我被困在这阿布的问题已经6小时了。

来源

2014-02-27 Benz

你可以发布'activity_display_requested.xml'？ – Raghunandan

也告诉我们哪些代码是行号86？ –

我假设'R.id.pid'不是'theRow.mTextViewPID'.Post'activity_display_requested.xml'的正确'ID'。 –

activity_display_requested.xml中没有TextView。

你可能正在夸大错误的布局。您正在充气activity_display_requested.xml。

convertView = mInflater.inflate(R.layout.activity_display_requested, null);

findViewById寻找当前充气布局中的视图。如果你有布局和textviews然后膨胀该布局和初始化视图

来源

2014-02-27 07:07:46 Raghunandan

与textview的XML是一个不同的XML文件。改变了它并解决了问题。谢谢。 – Benz

@firaga没问题，很乐意帮忙 – Raghunandan

使用本

if((m_productsList !=null)){ 
count = m_productsList.size();

} 在getCount将（）methode.hope它会工作。

来源

2014-02-27 07:07:14 Yogendra

也是结果。 nullpointerexception在同一行 – Benz

使用thisRow.mTextViewPID.setText（“”+ m_productsList.get（position）.pid）;并让我知道，这是工作与否 – Yogendra

getpoint自定义适配器上的nullpointerexception

回答

相关问题