下面是顯示自定義對話框的代碼

    private void showDialog() {
        AlertDialog.Builder builder = new AlertDialog.Builder(Blackname_Activity.this);
        //要自定義對話框的樣式所以調用creat方法
        AlertDialog dialog = builder.create();
        View view = View.inflate(getApplicationContext(), R.layout.blackname_insert_dialog, null);
        //將低版本的間距取消掉
        dialog.setView(view,0,0,0,0);
        dialog.show();
    }

剛開始我把

AlertDialog.Builder builder = new AlertDialog.Builder(Blackname_Activity.this);
寫成了
AlertDialog.Builder builder = new AlertDialog.Builder(getApplicationContext());

報了個錯誤

Unable to add window -- token null is not for an application