SwipeListView使用的NullPointerException [英] SwipeListView usage NullPointerException
问题描述
我试图用 SwipeListView
,但是当我在我的应用程序触碰某个项目,它会崩溃,日志信息有:
I'm trying to use SwipeListView
, but when I touch an item on my app, it's will be crash, the log info is there:
05-26 21:52:26.545: E/AndroidRuntime(19862): java.lang.NullPointerException
05-26 21:52:26.545: E/AndroidRuntime(19862): at com.fortysevendeg.android.swipelistview.SwipeListViewTouchListener.setFrontView(SwipeListViewTouchListener.java:121)
05-26 21:52:26.545: E/AndroidRuntime(19862): at com.fortysevendeg.android.swipelistview.SwipeListViewTouchListener.onTouch(SwipeListViewTouchListener.java:485)
05-26 21:52:26.545: E/AndroidRuntime(19862): at com.fortysevendeg.android.swipelistview.SwipeListView.onInterceptTouchEvent(SwipeListView.java:481)
我用它一步一步
import android.app.Activity;
import android.os.Bundle;
import com.fortysevendeg.android.swipelistview.SwipeListView;
import com.mkyong.android.adaptor.MobileArrayAdapter;
public class ListMobileActivity extends Activity {
static final String[] MOBILE_OS = new String[] { "Android", "iOS",
"WindowsMobile", "Blackberry"};
MobileArrayAdapter myad ;
private SwipeListView swipeListView;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.mainactivity);
swipeListView =(SwipeListView)findViewById(R.id.book_listview);
myad=new MobileArrayAdapter(this, MOBILE_OS);
swipeListView.setAdapter(myad);
}
}
下面是我的布局文件
<?xml version="1.0" encoding="UTF-8"?>
android:id="@+id/LinearLayoutListView"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:background="#FFFFFF" >
xmlns:swipe="http://schemas.android.com/apk/res-auto"
android:id="@+id/book_listview"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:listSelector="#00000000"
swipe:swipeActionLeft="dismiss"
swipe:swipeBackView="@+id/back"
swipe:swipeCloseAllItemsWhenMoveList="true"
swipe:swipeFrontView="@+id/front"
swipe:swipeMode="both" />
难道有什么我错过?谢谢
Did there anything I miss? Thanks
推荐答案
只需确保布局在你所适配器夸大包含 @ + ID /回
和 @ + ID /前
部分。
Just ensure that layout you are inflating in you adapter contains @+id/back
and @+id/front
components.
在换句话说,如果你SwipeListView声明声明 @ + ID /回
和 @ + ID /前
作为刷卡意见...
In other words, if your SwipeListView declaration declares @+id/back
and @+id/front
as swipe views ...
<...SwipeListView
android:id="@+id/swipe_list"
android:layout_width="match_parent"
android:layout_weight="1.0"
android:layout_height="0dp"
app:swipeFrontView="@+id/front" <=====
app:swipeBackView="@+id/back" <=====
app:swipeActionLeft="dismiss"
app:swipeCloseAllItemsWhenMoveList="true"
app:swipeMode="both"
/>
...然后,预期这在您适配器膨胀布局包含这些组件。在实例布局正在膨胀适配器被称为package_row.xml,这里是适配器的文档片断:
... then it is expected that layout which you inflate in your adapter contains these components. In example the layout being inflated in adapter is called package_row.xml, here is a snipped of adapter:
@Override
public View getView(final int position, View convertView, ViewGroup parent) {
final PackageItem item = getItem(position);
ViewHolder holder;
if (convertView == null) {
LayoutInflater li = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
convertView = li.inflate(R.layout.package_row, parent, false);
^^^^^^^^^^^^^^^^^^^^^^^^^^^^
holder = new ViewHolder();
holder.ivImage = (ImageView) convertView.findViewById(R.id.example_row_iv_image);
...
} else {
holder = (ViewHolder) convertView.getTag();
}
...
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