I am trying to display rows from my table in SQLite database in custom ListView for that i created an ProductAdapter class . I am getting an error while running the App Following is the error
07-31 14:31:42.548 1968-1968/? E/AndroidRuntime﹕ FATAL EXCEPTION: main
java.lang.NullPointerException
at com.sling.freshecomart.ProductAdapter.getView(ProductAdapter.java:54)
at android.widget.AbsListView.obtainView(AbsListView.java:2267)
at android.widget.ListView.measureHeightOfChildren(ListView.java:1244)
at android.widget.ListView.onMeasure(ListView.java:1156)
at android.view.View.measure(View.java:15172)
at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:4814)
at android.widget.LinearLayout.measureChildBeforeLayout(LinearLayout.java:1390)
at android.widget.LinearLayout.measureVertical(LinearLayout.java:681)
at android.widget.LinearLayout.onMeasure(LinearLayout.java:574)
at android.view.View.measure(View.java:15172)
at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:4814)
at android.widget.LinearLayout.measureChildBeforeLayout(LinearLayout.java:1390)
at android.widget.LinearLayout.measureVertical(LinearLayout.java:681)
at android.widget.LinearLayout.onMeasure(LinearLayout.java:574)
at android.view.View.measure(View.java:15172)
at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:4814)
at android.widget.LinearLayout.measureChildBeforeLayout(LinearLayout.java:1390)
at android.widget.LinearLayout.measureVertical(LinearLayout.java:681)
at android.widget.LinearLayout.onMeasure(LinearLayout.java:574)
at android.view.View.measure(View.java:15172)
at android.widget.RelativeLayout.measureChildHorizontal(RelativeLayout.java:617)
at android.widget.RelativeLayout.onMeasure(RelativeLayout.java:399)
at android.view.View.measure(View.java:15172)
at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:4814)
at android.widget.FrameLayout.onMeasure(FrameLayout.java:310)
at android.support.v7.internal.widget.ContentFrameLayout.onMeasure(ContentFrameLayout.java:124)
at android.view.View.measure(View.java:15172)
at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:4814)
at android.support.v7.internal.widget.ActionBarOverlayLayout.onMeasure(ActionBarOverlayLayout.java:444)
at android.view.View.measure(View.java:15172)
at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:4814)
at android.widget.FrameLayout.onMeasure(FrameLayout.java:310)
at android.view.View.measure(View.java:15172)
at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:4814)
at android.widget.LinearLayout.measureChildBeforeLayout(LinearLayout.java:1390)
at android.widget.LinearLayout.measureVertical(LinearLayout.java:681)
at android.widget.LinearLayout.onMeasure(LinearLayout.java:574)
at android.view.View.measure(View.java:15172)
at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:4814)
at android.widget.FrameLayout.onMeasure(FrameLayout.java:310)
at com.android.internal.policy.impl.PhoneWindow$DecorView.onMeasure(PhoneWindow.java:2148)
at android.view.View.measure(View.java:15172)
at android.view.ViewRootImpl.performMeasure(ViewRootImpl.java:1848)
at android.view.ViewRootImpl.measureHierarchy(ViewRootImpl.java:1100)
at android.view.ViewRootImpl.performTraversals(ViewRootImpl.java:1273)
at android.view.ViewRootImpl.doTraversal(ViewRootImpl.java:998)
at android.view.ViewRootImpl$TraversalRunnable.run(ViewRootImpl.java:4212)
at android.view.Choreographer$CallbackRecord.run(Choreographer.java:725)
at android.view.Choreographer.doCallbacks(Choreographer.java:555)
at android.view.Choreographer.doFrame(Choreographer.java:525)
at android.view.Choreographer$FrameDisplayEventReceiver.run(Choreographer.java:711)
at android.os.Handler.handleCallback(Handler.java:615)
at android.os.Handler.dispatchMessage(Handler.java:92)
at android.os.Looper.loop(Looper.java:137)
at android.app.ActivityThread.main(ActivityThread.java:4745)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:511)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:786)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:553)
at dalvik.system.NativeStart.main(Native Method)
following is the line ProductAdapter.java:54
convertView = mInflater.inflate(R.layout.item,null);
ProductAdapter class is
public class ProductAdapter extends BaseAdapter {
private List<com.sling.freshecomart.Product> mProductList;
private LayoutInflater mInflater;
private Activity activity;
private LayoutInflater inflater=null;
public ProductAdapter(List<Product> list, Activity a) {
this.mProductList = list;
this.activity=a;
inflater = (LayoutInflater) this.activity.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
}
@Override
public int getCount() {
return mProductList.size();
}
@Override
public Object getItem(int position) {
return mProductList.get(position);
}
@Override
public long getItemId(int position) {
return position;
}
@Override
public View getView(int position, View convertView, ViewGroup parent) {
final ViewItem item;
if (convertView == null) {
convertView = mInflater.inflate(R.layout.item,null);
item = new ViewItem();
item.post_id=(TextView)convertView.findViewById(R.id.post_id);
item.Name = (TextView)convertView.findViewById(R.id.Name);
item.Weight = (TextView)convertView.findViewById(R.id.Weight);
item.Description = (TextView)convertView.findViewById(R.id.Description);
item.saveValue = (TextView)convertView.findViewById(R.id.saveValue);
item.mrpValue = (TextView)convertView.findViewById(R.id.mrpValue);
item.Price = (TextView)convertView.findViewById(R.id.Price);
convertView.setTag(item);
} else {
item = (ViewItem) convertView.getTag();
}
com.sling.freshecomart.Product cartProduct = mProductList.get(position);
item.Name.setText(cartProduct.Name);
item.Weight.setText(cartProduct.Weight);
item.Description.setText(cartProduct.Description);
item.mrpValue.setText(cartProduct.mrpValue);
item.saveValue.setText(cartProduct.saveValue);
item.Price.setText(cartProduct.Price);
return convertView;
}
private class ViewItem {
private TextView post_id,Name,Weight,Description,mrpValue,saveValue,Price;
}
}
Product class is
public class Product {
public String post_id,Name,Weight,Description;
public int mrpValue,saveValue,Price;
public Drawable productImage;
public boolean selected;
public Product(String Name,String Wieght,String Description,int mrpValue,int saveValue,int Price) {
this.Name = Name;
this.Weight=Wieght;
this.Description = Description;
this.mrpValue=mrpValue;
this.saveValue=saveValue;
this.Price = Price;
}
}
oncreate() of The activity where the list should be displayed
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_cart);
cartDB= new SQLiteHandler(this);
Cursor res= cartDB.getCartDetails();
ListView lv_cart = (ListView) findViewById(R.id.ListViewCart);
List<Product> cartList = new ArrayList<>();
int NoOfItemsInCart = res.getCount();
if(res.getCount()==0){
showMessage("Error","No rows Found");
}else {
res.moveToFirst();
while (NoOfItemsInCart != 0) {
res.getString(0);
String CName = res.getString(1);
String CWeight = res.getString(2);
String CDescription = res.getString(3);
int CmrpValue = res.getInt(4);
int CsaveValue = res.getInt(5);
int CPrice = res.getInt(6);
cartList.add(new Product(CName, CWeight, CDescription, CmrpValue, CsaveValue, CPrice));
res.moveToNext();
NoOfItemsInCart = NoOfItemsInCart - 1;
}
ProductAdapter adapter = new ProductAdapter(cartList, this);
lv_cart.setAdapter(adapter);
}
Please help and Thanks in Advance
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