Java 如何修复拾取联系人时的类型不匹配错误？

在这条线上

val contactUri: Uri? = data.data
…
val cursor = requireActivity().contentResolver
    .query(**contactUri**, queryFields, null, null, null)

类型不匹配所需Uri获取Uri

你怎么解决这个问题

代码示例

override fun onActivityResult(requestCode: Int, resultCode: Int, data: Intent?) {
    when {
        resultCode != Activity.RESULT_OK -> return

        requestCode == REQUEST_CONTACT && data != null -> {
            val contactUri: Uri? = data.data
            // Specify which fields query to return values for.
            val queryFields = arrayOf(ContactsContract.Contacts.DISPLAY_NAME)
            // Perform query
            val cursor = requireActivity().contentResolver
                .query(contactUri, queryFields, null, null, null)
            cursor?.use {
                // Double-check that you actually got results
                if (it.count == 0) {
                    return
                }

                // Pull out the first column of the first row of data
                it.moveToFirst()
                val suspect = it.getString(0)
                crime.suspect = suspect
                crimeDetailViewModel.saveCrime(crime)
                suspectButton.text = suspect
            }
        }
    }
}

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或者尝试删除该文件？在您的uri之后，因此：

val contactUri: Uri = data.data

而不是

val contactUri: Uri? = data.data

或者如果这不起作用