菜单选项中的android显示对话框不起作用

Question

   //called when hardware button "Menu" clicked
    public boolean onCreateOptionsMenu(Menu menu) {
        MenuInflater inflater = getMenuInflater();
        inflater.inflate(R.menu.menu, menu);
        return true;
    }

然后是这个

@Override
    public boolean onMenuItemSelected(int featureId, MenuItem item) {
        switch (item.getItemId()) {
        case R.id.menu_options:
                startActivity(new Intent(this, EditPreferences.class));   
                break;
        case R.id.menu_about:
             Dialog dialog = new Dialog(getApplicationContext());
                dialog.requestWindowFeature(Window.FEATURE_NO_TITLE);//NO TITLE :)
                dialog.setContentView(R.layout.menu_about);
                dialog.setCancelable(true);
                dialog.show();
            break;

        default:
            break;
        }

//return true;
//return false;
        return super.onMenuItemSelected(featureId, item);
    }

使用调试我看到我进入了switch case R.id.menu_about，但是dialog.show() 没有做任何事情

对话框就是不显示，我也尝试使用标准的 AlertDialog，也不走运

Answer 1

尝试改变:

Dialog dialog = new Dialog(getApplicationContext());

到

Dialog dialog = new Dialog(this);