Question

这是我的ArrayAdapter代码。当我点击LinearLayout“cat”时，它会在dialog.show（）上给出错误。我不知道如何在ArrayAdapter类中创建自定义对话框。   当我删除创建对话框部分时，一切正常。

提前致谢

CategoryAdapter.java

public class CategoryAdapter extends ArrayAdapter<String> {
    private final Context context;

    String[] menu = new String[25] ;
    String[] menu2 = new String[25];
    String[] menu3 = new String[25];
    private LayoutInflater inflater;
    viewholder vh;
   
    public CategoryAdapter(Context context,    String [] menu,String [] menu2,String [] menu3) {
        super(context, R.layout.categoryadapter, menu);
        this.context = context;
        this.menu = menu;
        this.menu2=menu2;
        this.menu3=menu3;
    }
    public View getView(final int position, View convertView, ViewGroup parent) {
        {
            vh=new viewholder();
            if (inflater == null)
                inflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
            convertView = inflater.inflate(R.layout.categoryadapter, parent, false);
            vh.cat=(LinearLayout) convertView.findViewById(R.id.category);
            convertView.setTag(vh);
        }

        vh.cat.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                final Dialog dialog = new Dialog(getContext());
                dialog.setContentView(R.layout.update_categore_dialog);
                dialog.setTitle("Update Your Category");
                dialog.show();

                Toast.makeText(getContext(), "Clicked", Toast.LENGTH_LONG).show();
            }
        });

        return convertView;

    }
    public class viewholder
    {
        LinearLayout cat;
       
    }

}

Answer 1

使用context代替getContext()

final Dialog dialog = new Dialog(context);

最后，请传递context

vh.cat.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            final Dialog dialog = new Dialog(context);
            dialog.setContentView(R.layout.update_categore_dialog);
            dialog.setTitle("Update Your Category");
            dialog.show();

            Toast.makeText(getContext(), "Clicked", Toast.LENGTH_LONG).show();
        }
    });

Answer 2

尝试 -

 Dialog dialog = new Dialog(context);
                dialog.setContentView(R.layout.update_categore_dialog);
                dialog.setTitle("Update Your Category");
                dialog.show();

Answer 3

尝试以下链接，希望你喜欢它。

holder.btnDelete.setOnClickListener(new OnClickListener() { 
@Override
public void onClick(View view) {                

    AlertDialog.Builder alert = new AlertDialog.Builder((Activity)_context);

    alert.setMessage("Do you want to delete?");
        alert.setNegativeButton("CANCEL",
            new DialogInterface.OnClickListener() {
                @Override
                public void onClick(
                        DialogInterface dialog,
                        int whichButton) {
                    dialog.cancel();
                }
            });
    alert.setPositiveButton("OK",
            new DialogInterface.OnClickListener() {
                @Override
                public void onClick(
                        DialogInterface dialog,
                        int whichButton) {

                    OrderDetailListAdatper.this._listOrderListInfoAdapter
                            .remove(position);                          OrderDetailListAdatper.thisnotifyDataSetChanged();                                  
                }
            });
    alert.create().show(); // btw show() creates and shows it..
}
});

在你的适配器getview中

，粘贴该代码，它对我来说很好。

abstract class BasicTable[T](tag: Tag, tableName: String) 
    extends Table[T](tag, tableName) {

    def id = column[Option[Long]]("ID", O.PrimaryKey, O.AutoInc)

    def id1 = column[Long]("ID1")

    def id2 = column[String]("ID2")

    def idn = column[String]("IDn")

}

class T1(tag: Tag) extends BasicTable[caseClassA](tag, "A") {
    ...
    override def *  = ...
}

Answer 4

在getView()方法中，将getContext()替换为context变量。

vh.cat.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                final Dialog dialog = new Dialog(context);
                //remaining code...
            }
        });

在初始化CateogoryAdapter时，请不要传递getApplicationContext()，而是传递上下文（Activity.this）。

CategoryAdapter adapter = CategoryAdapter(YourActivity.this, menu, menu2, menu3)

如何在android中单击listview中的按钮时获取自定义对话框活动？

4 个答案: