Question

我有这个ListView包含的项目，我想创建一个警告对话框，当我长按项目时删除任何这些项目。项目上的onLongClick显示AlertDialog，如果我点击是，则会移除该项目。

这是我的代码。

listView.setOnItemLongClickListener(new AdapterView.OnItemLongClickListener() {
    @Override
    public boolean onItemLongClick(AdapterView<?> adapterView, View view, int i, long l) {
        new AlertDialog.Builder(MainActivity.this)
                .setIcon(android.R.drawable.ic_dialog_alert)
                .setMessage("Are You Sure You Want to Delete This Note?!")
                .setTitle("Attempt to Delete A Note")
                .setPositiveButton("YES", new DialogInterface.OnClickListener() {
                    @Override
                    public void onClick(DialogInterface dialogInterface, int i) {
                      try {
                          notesList.remove(i);
                          arrayAdapter.notifyDataSetChanged();

                          Toast.makeText(MainActivity.this, "ooooooh No!!", Toast.LENGTH_SHORT).show();
                      } catch (Exception e) {
                          e.printStackTrace();
                      }
                    }
                })
                .setNegativeButton("NO", new DialogInterface.OnClickListener() {
                    @Override
                    public void onClick(DialogInterface dialogInterface, int i) {
                        Toast.makeText(MainActivity.this, "Good Choice", Toast.LENGTH_SHORT).show();
                    }
                })
                .show();
        return true;
    }
});

Answer 1

我认为问题是'i'警告对话框点击列表器的位置，你需要用户列出项目点击位置才能从列表中删除项目。

请使用以下代码：

listView.setOnItemLongClickListener(new AdapterView.OnItemLongClickListener() {
        @Override
        public boolean onItemLongClick(AdapterView<?> adapterView, View view, int position, long l) {
            new AlertDialog.Builder(MainActivity.this)

                    .setIcon(android.R.drawable.ic_dialog_alert)
                    .setMessage("Are You Sure You Want to Delete This Note?!")
                    .setTitle("Attempt to Delete A Note")
                    .setPositiveButton("YES", new DialogInterface.OnClickListener() {
                        @Override
                        public void onClick(DialogInterface dialogInterface, int i) {
                          try {
                              if(notesList!=null){
                              notesList.remove(position);
                              arrayAdapter.notifyDataSetChanged();

                            Toast.makeText(MainActivity.this, "ooooooh No!!", Toast.LENGTH_SHORT).show();
                           }
                          }catch (Exception e){
                              e.printStackTrace();
                          }
                        }
                    })
                    .setNegativeButton("NO", new DialogInterface.OnClickListener() {
                        @Override
                        public void onClick(DialogInterface dialogInterface, int i) {
                            Toast.makeText(MainActivity.this, "Good Choice", Toast.LENGTH_SHORT).show();
                        }
                    })
                    .show();
            return true;
        }
    });

Answer 2

  const char *sql = "PRAGMA table_info(family)"; /* 'family' is the table name */

这对我有用...试试这个

使用警告对话框从ListView中删除项目

2 个答案: