单击自定义适配器内的按钮后设置ListView高度（安卓）

Question

我对自定义适配器的列表视图有问题。我使用TextView和Button创建了自定义布局。我希望当单击按钮时，从列表中删除项目后，列表的高度将根据列表中项目的数量而改变。 问题是，我发现要使用适配器请求列表视图的方法，所以我不能在内部定制适配器中调用它。 如何设置自定义适配器内的列表视图的高度？

MyCustomAdapter.java：

public class MyCustomAdapter extends BaseAdapter implements ListAdapter { 
private ArrayList<String> list = new ArrayList<String>(); 
private Context context; 
private ListView lista; 


public MyCustomAdapter(ArrayList<String> list, Context context) { 
    this.list = list; 
    this.context = context; 
} 

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

@Override 
public Object getItem(int pos) { 
    return list.get(pos); 
} 

@Override 
public long getItemId(int pos) { 
    return 0; 
    //just return 0 if your list items do not have an Id variable. 
} 

@Override 
public View getView(final int position, View convertView, ViewGroup parent) { 
    View view = convertView; 
    if (view == null) { 
     LayoutInflater inflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE); 
     view = inflater.inflate(R.layout.custom_row, null); 
    } 

    TextView listItemText = (TextView)view.findViewById(R.id.item); 
    listItemText.setText(list.get(position)); 

    Button btnExcluir = (Button)view.findViewById(R.id.btnExcluir); 

    btnExcluir.setOnClickListener(new View.OnClickListener(){ 
     @Override 
     public void onClick(View v) { 

      list.remove(position); 
      notifyDataSetChanged(); 

    //HERE I want to change ListView's height 
     } 
    }); 

    return view; 
} 

函数来设置ListView的高度：

public static void setListViewHeightBasedOnChildren(ListView listView) { 
    ListAdapter listAdapter = listView.getAdapter(); 
    if (listAdapter == null) 
     return; 

    int desiredWidth = View.MeasureSpec.makeMeasureSpec(listView.getWidth(), View.MeasureSpec.UNSPECIFIED); 
    int totalHeight = 0; 
    View view = null; 
    for (int i = 0; i < listAdapter.getCount(); i++) { 
     view = listAdapter.getView(i, view, listView); 
     if (i == 0) 
      view.setLayoutParams(new ViewGroup.LayoutParams(desiredWidth, ViewGroup.LayoutParams.WRAP_CONTENT)); 

     view.measure(desiredWidth, View.MeasureSpec.UNSPECIFIED); 
     totalHeight += view.getMeasuredHeight(); 
    } 
    ViewGroup.LayoutParams params = listView.getLayoutParams(); 
    params.height = totalHeight + (listView.getDividerHeight() * (listAdapter.getCount() - 1)); 
    listView.setLayoutParams(params); 
} 

custom_row.xml：

<?xml version="1.0" encoding="utf-8"?> 
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" 
xmlns:app="http://schemas.android.com/apk/res-auto" 
android:layout_width="match_parent" 
android:layout_height="match_parent" 
android:orientation="horizontal" > 


<TextView 
    android:id="@+id/item" 
    android:layout_width="wrap_content" 
    android:layout_height="wrap_content" 
    android:layout_weight="1" 
    android:text="TextView" 
    android:layout_marginLeft="10dp" 
    android:layout_marginStart="10dp" 
    android:layout_alignBaseline="@+id/btnExcluir" 
    android:layout_alignBottom="@+id/btnExcluir" 
    android:layout_alignParentLeft="true" 
    android:layout_alignParentStart="true" /> 

<Button 
    android:id="@+id/btnExcluir" 
    android:layout_width="wrap_content" 
    android:layout_height="wrap_content" 
    android:background="@drawable/ic_btnexcluir" 
    android:minHeight="0dp" 
    android:minWidth="0dp" 
    android:layout_alignParentTop="true" 
    android:layout_alignParentRight="true" 
    android:layout_alignParentEnd="true" 
    android:layout_marginRight="87dp" 
    android:layout_marginEnd="87dp" /> 

</LinearLayout> 

我真的很感激任何帮助！

Answer 1

更改构造这样，

public MyCustomAdapter(ArrayList<String> list, Context context, ListView lista) { 
      this.list = list; 
      this.context = context; 
      this.lista = lista; 
     } 

，你可以把它叫做适配器类中。