Question

这是我的代码，

b3.setOnClickListener(new View.OnClickListener() {

    @Override
    public void onClick(View v) {

        if (v == b3) {
            AlertDialog.Builder builder = new AlertDialog.Builder(this);
            builder.setMessage("Delete")
                    .setPositiveButton("Yes", new DialogInterface.OnClickListener() {
                        public void onClick(DialogInterface dialog, int id) {
                            mydb.deleteContact(id_To_Update);
                            Toast.makeText(getApplicationContext(), "Deleted Successfully", Toast.LENGTH_SHORT).show();
                            Intent intent = new Intent(getApplicationContext(),MainActivity.class);
                            startActivity(intent);
                        }
                    })
                    .setNegativeButton("No", new DialogInterface.OnClickListener() {
                        public void onClick(DialogInterface dialog, int id) {
                            // User cancelled the dialog
                        }
                    });
            AlertDialog d = builder.create();
            d.setTitle("Are you sure");
            d.show();
        }
    }

});

if (!rs.isClosed()) {
    rs.close();
}
name.setText(nam);
email.setText(emai);

当我在删除按钮上使用此代码时，首先出现错误“this”。怎么解决？如何使用删除确认消息？

请帮帮我。提前谢谢！

Answer 1

使用上下文而不仅仅是＆＃34;这个＆＃34;参考。您可以在此处使用Activity上下文，而不是任何其他上下文。有关详情，请访问这些链接Context，AlertDialog.Builder

对于活动：

 AlertDialog.Builder builder = new AlertDialog.Builder(ActivityName.this);

对于片段：

 AlertDialog.Builder builder = new AlertDialog.Builder(getActivity());

由于

Answer 2

您需要替换

AlertDialog.Builder builder = new AlertDialog.Builder(this);

带

AlertDialog.Builder builder = new AlertDialog.Builder(YourActivityName.this);

此警报对话框出错

2 个答案: