我有一个 gridView，在我使用 AstickyHeader 库之前它工作得很好。 实施 AstickyHeader Library 后，我的应用程序在滚动网格视图时崩溃。
我的 ViewHolder 似乎存在获取空对象引用的问题。但之前效果很好。非常感谢任何帮助。
这是我的 GridViewAdapter 的 getView() 方法。
@Override
public View getView(int position, View convertView, ViewGroup parent) {
View row = convertView;
// holder = null;
Log.e("position",position+"");
Product productItem = (Product) productList.get(position);
if (row == null) {
LayoutInflater inflater = ((Activity) context).getLayoutInflater();
row = inflater.inflate(R.layout.products_grid_item_layout, parent, false);
holder = new ViewHolder();
holder.productImage = (ImageView) row.findViewById(R.id.productImage);
holder.productImageClone = (ImageView) row.findViewById(R.id.productImageClone);
holder.detailsIcon = (ImageView) row.findViewById(R.id.detailsIcon);
holder.productTitle = (TextView) row.findViewById(R.id.productTitle);
holder.productSubTitle = (TextView) row.findViewById(R.id.productSubTitle);
holder.productQuantity = (TextView) row.findViewById(R.id.productQuantity);
holder.priceDollar = (TextView) row.findViewById(R.id.priceDollar);
holder.priceCent = (TextView) row.findViewById(R.id.priceCent);
holder.productCount = (TextView) row.findViewById(R.id.productCount);
holder.productGridLayout = (RelativeLayout) row.findViewById(R.id.productGridLayout);
row.setTag(holder);
} else {
holder = (ViewHolder) row.getTag();
Log.e("position tag",position+"");
}
String price = productItem.getPrice().toString();
String[] pricearray;
pricearray = price.split("\\.");
holder.productTitle.setText(productItem.getTitle().toString());
holder.productSubTitle.setText(productItem.getSubtitle().toString());
holder.productQuantity.setText(productItem.getVolume().toString());
holder.priceDollar.setText(pricearray[0]+".");
holder.priceCent.setText(pricearray[1]);
if(productItem.getInCart()) {
holder.productCount.setVisibility(View.VISIBLE);
holder.productCount.setText(productItem.getVolume());
}
Picasso.with(context)
.load(productItem.getImageUrl())
.placeholder(R.drawable.favourites)
.error(R.drawable.favourites)
.into(holder.productImage);
Picasso.with(context)
.load(productItem.getImageUrl())
.placeholder(R.drawable.favourites)
.error(R.drawable.favourites)
.into(holder.productImageClone);
urlSlug = productItem.getUrlSlug();
holder.detailsIcon.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
final int position = currentGridView.getPositionForView(v);
Log.e("grid position", position+"");
Intent productDetailIntent = new Intent(context,ProductDetailActivity.class);
productDetailIntent.putExtra("url_slug", productList.get(position).getUrlSlug());
context.startActivity(productDetailIntent);
}
});
return row;
}
这是product_grid_item_layout.xml
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/productGridLayout"
android:layout_width="wrap_content"
android:layout_height="180dp"
android:background="@drawable/categories_grid_color_selector"
>
<ImageView
android:id="@+id/demeterImage"
android:layout_width="60dp"
android:layout_height="30dp"
android:visibility="invisible"
android:layout_centerHorizontal="true"
/>
<ImageView
android:id="@+id/productImageClone"
android:layout_width="100dp"
android:layout_height="100dp"
android:paddingLeft="16dp"
android:paddingRight="16dp"
android:src="@drawable/fav"
android:layout_centerHorizontal="true"
/>
<ImageView
android:id="@+id/productImage"
android:layout_width="100dp"
android:layout_height="100dp"
android:paddingLeft="16dp"
android:paddingRight="16dp"
android:src="@drawable/fav"
android:layout_centerHorizontal="true"
/>
<TextView
android:id="@+id/productCount"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="1"
android:layout_alignBottom="@id/productImage"
android:background="@color/green"
android:textColor="@color/white"
android:padding="4dp"
android:layout_alignParentLeft="true"
android:layout_marginLeft="@dimen/margin_16"
android:visibility="invisible"/>
<TextView
android:id="@+id/productDiscount"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="10% KORTING"
android:layout_alignBottom="@id/productImage"
android:background="@color/pink"
android:textColor="@color/white"
android:padding="4dp"
android:layout_toRightOf="@id/productCount"
android:layout_marginLeft="8dp"
android:visibility="invisible"/>
<LinearLayout
android:id="@+id/productDescription"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:orientation="vertical"
android:layout_below="@id/productImage"
android:layout_alignParentLeft="true"
android:paddingLeft="@dimen/margin_16">
<TextView
android:id="@+id/productTitle"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentLeft="true"
android:text = "Product title"
android:textColor="@color/black"
/>
<TextView
android:id="@+id/productSubTitle"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_below="@id/productTitle"
android:text = "Product Sub title"
android:visibility="gone"
/>
<TextView
android:id="@+id/productQuantity"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_below="@id/productSubTitle"
android:text = "200 kg"
android:textColor="@color/gray"
/>
</LinearLayout>
<ImageView
android:id="@+id/detailsIcon"
android:layout_width="36dp"
android:layout_height="36dp"
android:layout_alignParentBottom="true"
android:layout_marginTop="8dp"
android:layout_alignParentLeft="true"
android:src="@drawable/info_circle"
android:paddingLeft="@dimen/margin_16"
/>
<LinearLayout
android:id="@+id/priceLayout"
android:layout_width="wrap_content"
android:layout_height="@dimen/cart_price_height"
android:gravity="center"
android:layout_alignParentRight="true"
android:layout_alignParentBottom="true"
android:padding="4dp"
android:layout_marginRight="8dp"
>
<TextView
android:id="@+id/priceDollar"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="0."
android:textStyle="bold"
android:textSize="24sp"
android:paddingLeft="4dp"
android:textColor="@color/black"
fontPath="fonts/SourceSansPro-Bold.ttf"/>
<TextView
android:id="@+id/priceCent"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="00"
android:layout_marginLeft="-6dp"
android:layout_marginTop="-1dp"
android:textStyle="bold"
android:textSize="14sp"
android:paddingRight="8dp"
android:textColor="@color/black"
fontPath="fonts/SourceSansPro-Bold.ttf"/>
</LinearLayout>
<LinearLayout
android:id="@+id/priceLayout2"
android:layout_width="wrap_content"
android:layout_height="@dimen/cart_price_height"
android:gravity="center"
android:layout_toLeftOf="@id/priceLayout"
android:layout_alignParentBottom="true"
android:padding="4dp"
android:visibility="invisible"
>
<TextView
android:id="@+id/priceDollar2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="0."
android:textStyle="bold"
android:textSize="24sp"
android:paddingLeft="4dp"
android:textColor="@color/gray"
fontPath="fonts/SourceSansPro-Bold.ttf"/>
<TextView
android:id="@+id/priceCent2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="00"
android:layout_marginLeft="-6dp"
android:textStyle="bold"
android:textSize="14sp"
android:paddingRight="8dp"
android:textColor="@color/gray"
fontPath="fonts/SourceSansPro-Bold.ttf"/>
</LinearLayout>
</RelativeLayout>
这是错误日志。
10-05 18:03:50.688 28933-28933/nl.proshore.ekoplaza E/AndroidRuntime: FATAL EXCEPTION: main
Process: nl.proshore.ekoplaza, PID: 28933
java.lang.NullPointerException: Attempt to read from field 'android.widget.TextView nl.proshore.ekoplaza.adapter.ProductsGridViewAdapter$ViewHolder.productTitle' on a null object reference
at nl.proshore.ekoplaza.adapter.ProductsGridViewAdapter.getView(ProductsGridViewAdapter.java:102)
at nl.proshore.ekoplaza.utils.SimpleSectionedGridAdapter.getView(SimpleSectionedGridAdapter.java:329)
at android.widget.AbsListView.obtainView(AbsListView.java:2360)
at android.widget.GridView.makeAndAddView(GridView.java:1440)
at android.widget.GridView.makeRow(GridView.java:366)
at android.widget.GridView.fillDown(GridView.java:307)
at android.widget.GridView.fillGap(GridView.java:267)
at android.widget.AbsListView.trackMotionScroll(AbsListView.java:5191)
at android.widget.AbsListView.scrollIfNeeded(AbsListView.java:3573)
at android.widget.AbsListView.onTouchMove(AbsListView.java:3982)
at android.widget.AbsListView.onTouchEvent(AbsListView.java:3807)
at android.view.View.dispatchTouchEvent(View.java:9939)
at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2663)
at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2344)
at dev.dworks.libs.astickyheader.ui.PinnedSectionGridView.dispatchTouchEvent(PinnedSectionGridView.java:487)
at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2669)
at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2358)
at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2669)
at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2358)
at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2669)
at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2358)
at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2669)
at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2358)
at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2669)
at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2358)
at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2669)
at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2358)
at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2669)
at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2358)
at com.android.internal.policy.DecorView.superDispatchTouchEvent(DecorView.java:411)
at com.android.internal.policy.PhoneWindow.superDispatchTouchEvent(PhoneWindow.java:1810)
at android.app.Activity.dispatchTouchEvent(Activity.java:3061)
at android.support.v7.view.WindowCallbackWrapper.dispatchTouchEvent(WindowCallbackWrapper.java:60)
at android.support.v7.view.WindowCallbackWrapper.dispatchTouchEvent(WindowCallbackWrapper.java:60)
at com.android.internal.policy.DecorView.dispatchTouchEvent(DecorView.java:373)
at android.view.View.dispatchPointerEvent(View.java:10159)
at android.view.ViewRootImpl$ViewPostImeInputStage.processPointerEvent(ViewRootImpl.java:4434)
at android.view.ViewRootImpl$ViewPostImeInputStage.onProcess(ViewRootImpl.java:4302)
at android.view.ViewRootImpl$InputStage.deliver(ViewRootImpl.java:3849)
at android.view.ViewRootImpl$InputStage.onDeliverToNext(ViewRootImpl.java:3902)
at android.view.ViewRootImpl$InputStage.forward(ViewRootImpl.java:3868)
at android.view.ViewRootImpl$AsyncInputStage.forward(ViewRootImpl.java:3995)
at android.view.ViewRootImpl$InputStage.apply(ViewRootImpl.java:3876)
at android.view.ViewRootImpl$AsyncInputStage.apply(ViewRootImpl.java:4052)
at android.view.ViewRootImpl$InputStage.deliver(ViewRootImpl.java:3849)
at android.view.ViewRootImpl$InputStage.onDeliverToNext(ViewRootImpl.java:3902)
at android.view.ViewRootImpl$InputStage.forward(ViewRootImpl.java:3868)
at android.view.ViewRootImpl$InputStage.apply(ViewRootImpl.java:3876)
at android.view.ViewRootImpl$InputStage.deliver(ViewRootImpl.java:3849)
at android.view.ViewRootImpl.deliverInputEvent(ViewRootImpl.java:6210)