请问一下，我这样取对话框的值为什么是空指针？

public void onClick(View view) {
                final View loginDialog=getLayoutInflater().inflate(R.layout.login,null);
                new AlertDialog.Builder(MainActivity.this)
                        .setTitle("登陆系统")
                        .setView(loginDialog)
                        .setPositiveButton("登录",
                                new DialogInterface.OnClickListener() {
                                    @Override
                                    public void onClick(DialogInterface dialogInterface, int i) {
                                        name=findViewById(R.id.name);
                                        pass=findViewById(R.id.pass);
                                        name1=name.getText().toString();
                                        pass1=name.getText().toString();