ContactsContract.CommonDataKinds 和空联系人列表

发布于 2024-12-09 21:34:29 字数 500 浏览 4 评论 0原文

我是 Android 开发新手（具有 C# 背景），并且一直在研究书中的一些示例。我对以下代码行有疑问。

public void onClick(View arg0){
    Intent i = new Intent(android.content.Intent.ACTION_PICK);
    i.setType(ContactsContract.CommonDataKinds.Email.CONTENT_TYPE);
    startActivityForResult(i, request_Code);
}

根据该书，此代码将允许用户从联系人列表中选择联系人。并将选定的联系人返回到呼叫活动。

我的问题是如何检查是否存储了任何联系人？

目前，当联系人列表为空或没有任何具有电子邮件地址的联系人时，i.setType... 行会失败。

在拨打电话之前有什么方法可以检查清单吗？或者有没有办法捕获异常？

提前致谢。

原文

I am new to Android development (coming from a C# background) and have been working through some examples in a book. I have a question about the following lines of code.

public void onClick(View arg0){
    Intent i = new Intent(android.content.Intent.ACTION_PICK);
    i.setType(ContactsContract.CommonDataKinds.Email.CONTENT_TYPE);
    startActivityForResult(i, request_Code);
}

According to the book, this code will allow the user to pick a contact from the contact's list. And return the selected contact to the calling activity.

My question is how to check if there are any contacts stored?

Right now, the i.setType... line fails when the contact list is empty or doesn't have any contacts with an email address.

Is there any way of checking the list before making the call? Or is there a way of capturing the exception?

Thanks in advance.

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