android.widget.RelativeLayout$LayoutParams 无法转换为 android.widget.AbsListView$LayoutParams

Question

根据大量教程和示例项目，我得到了以下代码，它应该用包含 Line 对象中的多个值的行填充 ListView。

作为一名新手程序员，我终其一生都无法弄清楚我的代码到底哪里出错了。任何帮助将不胜感激！

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);

        }
    }

自定义 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;      
    }
}

下面是用于澄清的 LogCat 日志（对我来说这没什么意义）。

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)

Answer 1

在你的getView()，更改

return parent;      

到

return rowView;

getView() 应该返回行视图，而不是放置行的父视图。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。

Answer 2

试试这个：

  LayoutInflater inflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
  convertView = inflater.inflate(R.layout.articles_list_row, parent, false);

  TextView articleName = (TextView) convertView.findViewById(R.id.textArticleName);
  EditText articleAmount = (EditText) convertView.findViewById(R.id.textArticleAmount);

重点是不要创建一个新的View：

View rowView = inflater.inflate(R.layout.articles_list_row, parent, false);

改为使用“提供的”View 来指代项目的行：

convertView = inflater.inflate(R.layout.articles_list_row, parent, false);

就像@lallto（其他答案）所说，将您的return 更改为return convertView; 以返回当前列表项。

为了获得更好的结果，请使用ViewHolder 模式：

http://www.vogella.com/tutorials/AndroidListView/article.html

Answer 3

在 getView 中返回 convertView 引用而不是父级，并使用 ViewHolder 设计模式来提高 ListView 性能：

public View getView(int position, View convertView, ViewGroup parent) {
     Viewholder viewholder;
     if(convertView==null){
        viewholder = new Viewholder();
        convertView = LayoutInflater.from(context).inflate(R.layout.articles_list_row, null);
        viewholder.articleName = (TextView) convertView.findViewById(R.id.textArticleName);
        viewholder.articleAmount = (EditText) convertView.findViewById(R.id.textArticleAmount);
        convertView.setTag(viewholder);
     }else{
        viewholder =(Viewholder) convertView.getTag();
     }

     viewholder.articleName.setText(lineList.get(position).getLineArticleDescription());
     viewholder.articleAmount.setText(lineList.get(position).getLineArticleAmount().toString());

    return convertView;
}

class Viewholder {
   TextView articleName;
   EditText articleAmount;
}

Answer 4

您应该根据父级选择 LayoutParams，在您的情况下，新的 LinearLayout.LayoutParams 应该是新的 RelativeLayout.LayoutParams。