Question

这是在Handler类中使用的删除方法：

    public void deleteRow(long rowId){
    SQLiteDatabase db = this.getWritableDatabase();
    db.delete(TABLE_CONTACTS, KEY_ID + "=" + rowId, null);
  }

我想从列表视图中删除所选行。这是我的ListView代码，它没有在logcat中显示任何错误，但没有删除该行。可能是什么问题？：

listView.setOnItemClickListener(new OnItemClickListener() {
    public void onItemClick(AdapterView<?> parent, View view,
            final int position, long id) {
        TextView textView = (TextView) view
                .findViewById(android.R.id.text1);
        String s = textView.getText().toString();


        AlertDialog.Builder alertDialogBuilder = new AlertDialog.Builder(
                context);
        alertDialogBuilder.setTitle("Delete?");
        alertDialogBuilder
                .setMessage("Click yes to delete")
                .setCancelable(false)

                .setNegativeButton("No",
                        new DialogInterface.OnClickListener() {

                            public void onClick(DialogInterface dialog,
                                    int which) {
                                // TODO Auto-generated method stub
                                dialog.cancel();// close the dialog and
                                                // do nothing..
                            }
                        })
                .setPositiveButton("Yes",
                        new DialogInterface.OnClickListener() {

                            public void onClick(DialogInterface dialog,
                                    int which) {


                                // TODO Auto-generated method stub

                                db = new SQLiteHandler(context);
                                db.open();
                                db.deleteRow(position);
                                db.close();

                            }
                        });

        // create alert dialog
        AlertDialog alertDialog = alertDialogBuilder.create();

        // show it
        alertDialog.show();
    }
});

Answer 1

    Try this:

    SQLiteDatabase db = this.getWritableDatabase();
    db.delete(TABLE_CONTACTS, KEY_ID + "= ?"  , new String[] { ""+rowId });

Answer 2

db.delete(TABLE_CONTACTS, KEY_ID + "=?", new String[] {String.valueOf(rowId)});

如何从android中的表中删除一行？

2 个答案: