android 自定义列表弹窗报错You need to use a Theme.AppCompat theme (or descendant) with this activity.
今天进了一个坑，来分享一下，免得大家也犯这个错误

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

    View view =View.inflate(getApplicationContext(),R.layout.item,null);
    alertDialog.setTitle("提示").setView(view).create();;
    EditText editText =view.findViewById(R.id.editText);
    Button button =view.findViewById(R.id.OK);
    button.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View view) {
            data_user =Double.valueOf(editText.getText().toString());
        }
    });

    alertDialog.show();

}

在new AlertDialog.Builder(this);里只能传入当前的activity，切记不能传全局application，我有这个习惯，上下文对象首选get全局application，这次真的进坑了