在众多教程和示例项目之后,我得到了以下代码,该代码应该在ListView中填充包含Line对象中多个值的行.
作为一个新手程序员,我不能为我的生活弄清楚我的代码在哪里失败.任何帮助将非常感激!
如果我遗漏了重要信息,请告诉我,我会更新这个问题.
在Fragment中启动它的代码:
@Override
public void onActivityCreated(Bundle savedInstanceState){
super.onActivityCreated(savedInstanceState);
Intent i = getActivity().getIntent();
if (i.getSerializableExtra("ChosenWorkorder") != null){
Workorder selectedWorkorder = (Workorder) i.getSerializableExtra("ChosenWorkorder");
Articleslistadapter articleslistadapter = new Articleslistadapter(getActivity(),R.layout.articles_list_row,selectedWorkorder.GetAllLines());
ListView articlesList = (ListView) getActivity().findViewById(R.id.ArticlesList);
articlesList.setAdapter(articleslistadapter);
}
}
Custom ArrayAdapter:
public class Articleslistadapter extends ArrayAdapter<Line> {
private List<Line> lineList;
private Context context;
public Articleslistadapter(Context context,int textViewResourceId,List<Line> objects) {
super(context,textViewResourceId,objects);
this.lineList = objects;
this.context = context;
}
public int getCount() {
return lineList.size();
}
public Line getItem(int position) {
return lineList.get(position);
}
public long getItemId(int position) {
return position;
}
@SuppressLint("ViewHolder") /* Que? */
public View getView(int position,View convertView,ViewGroup parent) {
LayoutInflater inflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
View rowView = inflater.inflate(R.layout.articles_list_row,parent,false);
TextView articleName = (TextView) rowView.findViewById(R.id.textArticleName);
EditText articleAmount = (EditText) rowView.findViewById(R.id.textArticleAmount);
Line articleLine = lineList.get(position);
articleName.setText(articleLine.getLineArticleDescription());
articleAmount.setText(articleLine.getLineArticleAmount().toString());
return parent;
}
}
下面是LogCat日志以便澄清(对我而言,这意味着什么).
E/AndroidRuntime(15941): FATAL EXCEPTION: main E/AndroidRuntime(15941): Process: be.mabolifting.maboserve,PID: 15941 E/AndroidRuntime(15941): java.lang.classCastException: android.widget.RelativeLayout$LayoutParams cannot be cast to android.widget.AbsListView$LayoutParams E/AndroidRuntime(15941): at android.widget.ListView.setupChild(ListView.java:1826) E/AndroidRuntime(15941): at android.widget.ListView.makeAndAddView(ListView.java:1793) E/AndroidRuntime(15941): at android.widget.ListView.fillDown(ListView.java:691) E/AndroidRuntime(15941): at android.widget.ListView.fillFromTop(ListView.java:752) E/AndroidRuntime(15941): at android.widget.ListView.layoutChildren(ListView.java:1630) E/AndroidRuntime(15941): at android.widget.AbsListView.onLayout(AbsListView.java:2087) E/AndroidRuntime(15941): at android.view.View.layout(View.java:14860) E/AndroidRuntime(15941): at android.view.ViewGroup.layout(ViewGroup.java:4643) E/AndroidRuntime(15941): at android.widget.RelativeLayout.onLayout(RelativeLayout.java:1055) E/AndroidRuntime(15941): at android.view.View.layout(View.java:14860) E/AndroidRuntime(15941): at android.view.ViewGroup.layout(ViewGroup.java:4643) E/AndroidRuntime(15941): at android.support.v4.view.ViewPager.onLayout(ViewPager.java:1594) E/AndroidRuntime(15941): at android.view.View.layout(View.java:14860) E/AndroidRuntime(15941): at android.view.ViewGroup.layout(ViewGroup.java:4643) E/AndroidRuntime(15941): at android.widget.FrameLayout.layoutChildren(FrameLayout.java:453) E/AndroidRuntime(15941): at android.widget.FrameLayout.onLayout(FrameLayout.java:388) E/AndroidRuntime(15941): at android.view.View.layout(View.java:14860) E/AndroidRuntime(15941): at android.view.ViewGroup.layout(ViewGroup.java:4643) E/AndroidRuntime(15941): at com.android.internal.widget.ActionBarOverlayLayout.onLayout(ActionBarOverlayLayout.java:374) E/AndroidRuntime(15941): at android.view.View.layout(View.java:14860) E/AndroidRuntime(15941): at android.view.ViewGroup.layout(ViewGroup.java:4643) E/AndroidRuntime(15941): at android.widget.FrameLayout.layoutChildren(FrameLayout.java:453) E/AndroidRuntime(15941): at android.widget.FrameLayout.onLayout(FrameLayout.java:388) E/AndroidRuntime(15941): at android.view.View.layout(View.java:14860) E/AndroidRuntime(15941): at android.view.ViewGroup.layout(ViewGroup.java:4643) E/AndroidRuntime(15941): at android.view.ViewRootImpl.performlayout(ViewRootImpl.java:2013) E/AndroidRuntime(15941): at android.view.ViewRootImpl.performTraversals(ViewRootImpl.java:1770) E/AndroidRuntime(15941): at android.view.ViewRootImpl.doTraversal(ViewRootImpl.java:1019) E/AndroidRuntime(15941): at android.view.ViewRootImpl$TraversalRunnable.run(ViewRootImpl.java:5725) E/AndroidRuntime(15941): at android.view.Choreographer$CallbackRecord.run(Choreographer.java:761) E/AndroidRuntime(15941): at android.view.Choreographer.doCallbacks(Choreographer.java:574) E/AndroidRuntime(15941): at android.view.Choreographer.doFrame(Choreographer.java:544) E/AndroidRuntime(15941): at android.view.Choreographer$FramedisplayEventReceiver.run(Choreographer.java:747) E/AndroidRuntime(15941): at android.os.Handler.handleCallback(Handler.java:733) E/AndroidRuntime(15941): at android.os.Handler.dispatchMessage(Handler.java:95) E/AndroidRuntime(15941): at android.os.Looper.loop(Looper.java:136) E/AndroidRuntime(15941): at android.app.ActivityThread.main(ActivityThread.java:5086) E/AndroidRuntime(15941): at java.lang.reflect.Method.invokeNative(Native Method) E/AndroidRuntime(15941): at java.lang.reflect.Method.invoke(Method.java:515) E/AndroidRuntime(15941): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:785) E/AndroidRuntime(15941): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:601) E/AndroidRuntime(15941): at dalvik.system.NativeStart.main(Native Method)
解决方法
在你的getView()中,改变
return parent;
至
return rowView;
getView()应返回行视图而不是放置行的父级.父视图仅作为参数提供,以便视图膨胀可以处理match_parent大小等.