我想在菜单中的选项，点击创建一个自定义对话框。我去开始一个新的活动，意图指向customTextMessageDialog。

我是能够得到处理以任何使用code，如phoneNumber的=（EditText上）dialog.findViewById在我customdialog.xml文件中定义的小部件（R.id.customDialogPhoneNumber1 ）;

然而，我无法与该句柄做任何事情。我尝试的setText（）的一个EditText手柄或那一刻，如果我设置一个onClickListener在我的XML我的应用程序崩溃定义的按钮中的一个。任何想法，为什么发生这种情况，我怎么能解决这个问题？

另外，为什么我需要之前，先在该实例上调用findViewById创建对话框的实例？

 公共类customTextMessageDialog扩展活动
{
    的EditText phoneNumber的;
    的EditText消息;
    按钮cancelButton;
    按钮sendButton;

公共无效的onCreate（包savedInstanceState）
{
    super.onCreate（savedInstanceState）;
    的setContentView（R.layout.customdialog）;
    对话对话框=新的对话框（本）;
    phoneNumber的=（EditText上）dialog.findViewById（R.id.customDialogPhoneNumber1）;
    //phoneNumber.setTextColor(R.color.gray）;
    //phoneNumber.setText("ex：4127214544）;
    消息=（EditText上）dialog.findViewById（R.id.customDialogMessage1）;
    cancelButton =（按钮）dialog.findViewById（R.id.customDialogCancelButton1）;
    cancelButton.setOnClickListener（新OnClickListener（）
    {
        @覆盖
        公共无效的onClick（视图v）{
            完（）;

        }
    }）;
    sendButton =（按钮）dialog.findViewById（R.id.customDialogPhoneNumber1）;
}
}
 

解决方案

在你的code您正在设置活动的内容查看到 customDialog 。您需要在对话框的布局设置为布局。阅读这。

做到这一点：

  dialog.setContentView（R.layout.customdialog）;
 

I am trying to create a custom dialog box on the click of an option in the menu. I go on to start a new activity with the Intent pointing to customTextMessageDialog.

I am able to get the handle to any of the widgets defined in my customdialog.xml file using code like "phoneNumber = (EditText)dialog.findViewById(R.id.customDialogPhoneNumber1);"

However, I can't do anything with this handle. The moment I try to setText() for an EditText handle or if I set an onClickListener for one of the buttons defined in my xml my application crashes. Any idea as to why this is happening and how I can fix this?

Also, why do I need to create an instance of Dialog first before calling findViewById on that instance?

public class customTextMessageDialog extends Activity
{
    EditText phoneNumber;
    EditText message;
    Button cancelButton;
    Button sendButton;

public void onCreate(Bundle savedInstanceState)
{
    super.onCreate(savedInstanceState);
    setContentView(R.layout.customdialog);
    Dialog dialog = new Dialog(this);
    phoneNumber = (EditText)dialog.findViewById(R.id.customDialogPhoneNumber1);
    //phoneNumber.setTextColor(R.color.gray);
    //phoneNumber.setText("ex: 4127214544");
    message = (EditText)dialog.findViewById(R.id.customDialogMessage1);
    cancelButton = (Button)dialog.findViewById(R.id.customDialogCancelButton1);
    cancelButton.setOnClickListener(new OnClickListener()
    {
        @Override
        public void onClick(View v) {
            finish();

        }
    });
    sendButton = (Button)dialog.findViewById(R.id.customDialogPhoneNumber1);
}
}

In your code you are setting the Activity's contentView to customDialog. You need to set the layout of your dialog to that layout. Read this.

Do this:

dialog.setContentView(R.layout.customdialog);