我想从数据库中删除特定行以及从列表视图中删除当我单击删除按钮时，我试过但我没有收到错误
UserAdapter无法强制转换为android.content.Context
这是我的适配器
public class UserAdapter extends BaseAdapter implements OnTaskCompleted{
Context context;
UserAdapter userAdapter;
Bundle b=new Bundle();
HashMap<Integer, UserSetter> userSettersClassHashMap;
int layoutResId;
String email_id="";
private HashMap<String, String> postDataParams = null;
TextView fname,lname,uname,empid,emailid,contact,role;
Button edit,remove;
public UserAdapter(Context context, HashMap<Integer, UserSetter> userSettersClassHashMap, int layoutResId) {
this.context = context;
this.userSettersClassHashMap = userSettersClassHashMap;
this.layoutResId = layoutResId;
}
@Override
public int getCount() {
return userSettersClassHashMap.size();
}
@Override
public Object getItem(int position) {
return userSettersClassHashMap.get(position);
}
@Override
public long getItemId(int position) {
return 0;
}
@Override public View getView（final int position，View convertView，ViewGroup parent）{
View view;
if (convertView == null) {
LayoutInflater lf = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
convertView = lf.inflate(layoutResId, parent, false);
view = convertView;
} else {
view = convertView;
}
fname = (TextView) view.findViewById(R.id.fname);
emailid= (TextView) view.findViewById(R.id.emailid);
role= (TextView) view.findViewById(R.id.role);
remove=(Button) view.findViewById(R.id.remove);
fname.setText(Html.fromHtml(userSettersClassHashMap.get(position).getFirstname()));
role.setText(Html.fromHtml(userSettersClassHashMap.get(position).getRoleName()));
remove.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
email_id = String.valueOf(emailid.getText());
Log.v("email adapter", String.valueOf(email_id));
callRemove();
notifyDataSetChanged();
}
public void callRemove() {
postDataParams = new HashMap<>();
postDataParams.put("email_id", email_id);
Log.d("postdataparams","->"+postDataParams);
new WebService(UserAdapter.this, postDataParams, "RemoveList").execute(AppConstants.BASE_URL + AppConstants.REMOVE_DATA);
}
});
return view;
}
2 回答
改变这一行
new WebService(UserAdapter.this, postDataParams, "RemoveList").execute(AppConstants.BASE_URL + AppConstants.REMOVE_DATA);至
new WebService(context, postDataParams, "RemoveList").execute(AppConstants.BASE_URL + AppConstants.REMOVE_DATA);你必须传递上下文而不是USerAdapter.this：