Question

我还是Android新手。我想在我创建的ListView中访问TextEdit视图。每个ListView项都包含一个线性布局，而线性布局又包含一个EditText。

我正在尝试这样做而且它不起作用。

View v = MyListView.getChildAt(2);
EditText et = (EditText) v.findViewById(R.id.edittext_1);

其中edittext_1位于定义ListView中每个LinearLayout项的xml中。

编辑：更多代码供参考。这在我的activity的片段中调用以创建ListView。

Resources res = getResources();
            GradeTypeListView = (ListView) rootView.findViewById(R.id.gtListView);

//          Applies the adapter to populate the ListView
            gtAdapter = new GradeTypeListAdapter(this.getActivity(), gradeTypeList, res, this);
            GradeTypeListView.setAdapter(gtAdapter);

我的适配器使用LinearLayout模板为每个ListView项目充气。适配器的getView（）代码是

@Override
    public View getView(int position, View convertView, ViewGroup parent){
        View v = convertView;
        ViewHolder holder;

        //  If the view doesn't yet exist, assign views in templates to views in holder.
        if(convertView == null){
            v = inflater.inflate(R.layout.course_list_item, null);


            holder = new ViewHolder();
            holder.title = (TextView) v.findViewById(R.id.title);
            holder.comment = (TextView) v.findViewById(R.id.comment);
            holder.letterGrade = (TextView) v.findViewById(R.id.letterGrade);
            holder.percentage = (TextView) v.findViewById(R.id.percentage);

            v.setTag(holder);

        //  If the view exists, then holder equals the object returned by getTag(). getTag is a method
        //  that allows a view to basically hold an object.
        } else
            holder = (ViewHolder) v.getTag();

        if(data.size() <= 0 ) {
            holder.title.setText("No Data");
            System.out.println("Empty I guess");

        //  Set the views' contents and onClickListener
        } else {
            course = null;
            course = (CourseWithGrade) data.get(position);
            holder.title.setText(course.getTitle());
            holder.comment.setText("Hard-coded comment!");
            holder.letterGrade.setText(course.letterGrade);
            holder.percentage.setText(course.percentage);

            v.setOnClickListener(new OnItemClickListener(position));
        }
        return v;
    }

R.layout.course_list_item XML

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:layout_margin="15dp"
    android:paddingRight="10dp" >

    <TextView
        android:id="@+id/title"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentLeft="true"
        android:layout_alignParentTop="true"
        android:maxWidth="110dp"
        android:text="TextView" />

    <TextView
        android:id="@+id/letterGrade"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentTop="true"
        android:layout_centerVertical="true"
        android:layout_marginRight="35dp"
        android:layout_toLeftOf="@+id/percentage"
        android:text="TextView" />

    <TextView
        android:id="@+id/comment"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentLeft="true"
        android:layout_below="@+id/title"
        android:maxWidth="110dp"
        android:text="TextView"
        android:textSize="12sp" />

    <TextView
        android:id="@+id/percentage"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentRight="true"
        android:layout_centerVertical="true"
        android:text="TextView" />

</RelativeLayout>

如何从ListView中的ViewGroup获取视图？

0 个答案: