android - 自定义 AlertDialog 未显示

Question

我有一个 TextViewer Activity，它有一个按钮，当我点击它时，我想弹出一个带有列表的 AlertDialog。我跟着这个link但它不起作用(没有弹出窗口)。我认为上下文是错误的。我使用了以下代码:

    protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.resources);
    ImageButton btnlist = (ImageButton)findViewById(R.id.list);
    btnlist.setOnClickListener(new View.OnClickListener() {
             public void onClick (View v){                  

              if (Vars.bookchapter>1){
               final CharSequence[] items = {"Red", "Green", "Blue"};
               Context mContext = getBaseContext();
               AlertDialog.Builder builder = new AlertDialog.Builder(mContext);
               builder.setTitle("Pick a color");
               builder.setItems(items, new DialogInterface.OnClickListener() {
                   public void onClick(DialogInterface dialog, int item) {
                       Toast.makeText(getApplicationContext(), items[item], Toast.LENGTH_SHORT).show();
                   }
               });
               AlertDialog alert = builder.create();
              }else{
               //Nothing
              }
             }});         
     }
        }

Answer 1

您还没有调用 show()方法。这样做:

AlertDialog alert = builder.create();
alert.show();