java - 从 ListView 中的 ListView 中获取文本关闭

Question

我正在使用自定义 ListView ，并且该 ListView 具有“SwipeDismissListViewTouchListener”。当我滑动它时，它应该将文本显示为 toast 消息。我怎样才能做到这一点？请帮我。这是我的代码:

 SwipeDismissListViewTouchListener touchListener =
            new SwipeDismissListViewTouchListener(
                    lv,
                    new SwipeDismissListViewTouchListener.DismissCallbacks() {
                        @Override
                        public boolean canDismiss(int position) {
                            return true;
                        }

                        @Override
                        public void onDismiss(ListView listView, int[] reverseSortedPositions) {
                            for (int position : reverseSortedPositions) {
                                TextView text = (TextView) listView.findViewById(R.id.Details);
                                String s = text.getText().toString();
                                Toast.makeText(getApplicationContext(), s, Toast.LENGTH_LONG).show();
                            }
                            inAdapter.notifyDataSetChanged();
                        }
                    });
    lv.setOnTouchListener(touchListener);

这是我的自定义 ListView xml:

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:minHeight="50dp"
android:orientation="horizontal"
android:padding="5dip" >

<TextView
    android:id="@+id/Category_name"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:text=""
    android:textSize="18sp"
    android:typeface="normal" />

<TextView
    android:id="@+id/Details"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_below="@id/Category_name"
    android:layout_marginTop="5dip"
    android:text=""
    android:textColor="#343434"
    android:textSize="12sp"
    android:singleLine="true" 
    android:layout_marginRight="50dp"/>

<TextView
    android:id="@+id/Price"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_alignParentRight="true"
    android:text=""
    android:textColor="#343434"
    android:textSize="17sp" />

这段代码运行完美，只有当我滑动关闭时它才会抛出空指针异常。

Answer 1

像这样编写你的 onDismiss() 方法...

@Override
public void onDismiss(ListView listView, int[] reverseSortedPositions) {
    if(listView != null && reverseSortedPositions != null) {
       for (int position : reverseSortedPositions) {
          View child = listView.getChildAt(position);
          if(child != null) {
              TextView text = (TextView) child.findViewById(R.id.Details);
              String s = text.getText().toString();
              Toast.makeText(getApplicationContext(), s, Toast.LENGTH_LONG).show();
          }
       }
    }
   inAdapter.notifyDataSetChanged();
}