java - ClassCastException : android. widget.RelativeLayout 无法转换为 android.widget.TextView？

Question

我正在尝试输入转换数据，但是当我在 onItemClick(...) 下编写 TextView clickData=(TextView) view 时，logcat 显示消息:

java.lang.ClassCastException: android.widget.RelativeLayout cannot be cast to android.widget.TextView

我不知道为什么。

这属于主要 Activity :

  public class ListViewForAllContact extends AppCompatActivity {
        ListView myListView;
        protected  void onCreate(Bundle savedInstanceState){
            super.onCreate(savedInstanceState);
            setContentView(R.layout.listviewforallcontact);



            ContactDatabase onbOfContactDatabase=new ContactDatabase(getBaseContext());

            Cursor mCursor= onbOfContactDatabase.phoneName();

            String[] fromFileName=new String[]{ContactDatabase.NAME};
            int[] toViewId=new int[]{R.id.textView5};
            SimpleCursorAdapter simpleCursorAdapter;

            simpleCursorAdapter=new SimpleCursorAdapter(this,R.layout.forreading,mCursor,fromFileName,toViewId,0);
             myListView=(ListView)findViewById(R.id.listView);
            myListView.setAdapter(simpleCursorAdapter);

            myListView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
                @Override
                public void onItemClick(AdapterView<?> parent, View view, int position, long id) {

                    TextView clickData=(TextView) view;//becouse of this line error will come.

                    Toast.makeText(getBaseContext(), clickData.getText(), Toast.LENGTH_LONG).show();
                }
            });

        }
    }

这是带有 ListView 的 xml:

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
                android:layout_width="match_parent"
                android:layout_height="match_parent">


    <ListView
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:id="@+id/listView"
        android:layout_alignParentTop="true"
        android:layout_centerHorizontal="true"/>
</RelativeLayout>

这是带有 TextView 的第二个 XML 文件:

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
                android:layout_width="match_parent"
                android:layout_height="match_parent">

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:textAppearance="?android:attr/textAppearanceLarge"
        android:text="Large Text"
        android:id="@+id/textView5"
        android:layout_alignParentTop="true"
        android:layout_alignParentStart="true"/>





</RelativeLayout>

Answer 1

您要访问的 View 是您在第二个 xml 上显示的 RelativeLayout。如果你想访问 TextView，你必须在 RelativeLayout 上找到它。

而不是这个

TextView clickData=(TextView) view;

试试这个

TextView clickData=(TextView) view.findViewById(R.id. textView5);

我认为这可以解决您的问题

更新...

我的建议是使用适配器

public class YourAdapter extends BaseAdapter {

private ArrayList<Things> things;
private Context context;
private TextView yearTxtView;
private TextView weekTxtView;
private TextView extraTxtView;


public YourAdapter(Context context, ArrayList<Things> things) {
    this.things = things;
    this.context = context;
}

@Override
public int getCount() {
    return this.things.size();
}

@Override
public Object getItem(int position) {
    return this.things.get(position);
}

@Override
public long getItemId(int position) {
    return position;
}

@Override
public View getView(int position, View convertView, ViewGroup parent) {
    convertView =     LayoutInflater.from(this.context).inflate(R.layout.ITEM_LAYOUT, parent, false);

    convertView.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            //do your code here
        }
    });

    return convertView;


}

在你拥有的代码上，只需执行此操作

private YourAdapter yourAdapter;

this.yourAdapter = new YourAdapter(getActivity(),YourArray);

myListView.setAdapter(this.yourAdapter);