Kotlin This Cursor 在使用#close 后应该被释放

Question

Kotlin 使用后如何正确关闭游标。我知道如何在 Java 中做到这一点，但无论我在 Kotlin 中做什么，它仍然会发出关闭它的警告。

我试过了：

        val cursor = context!!.getContentResolver().query(DbProvider.CONTENT_URI_VERSES, null, where, null, null)!!
        if (cursor.moveToFirst()) {
            try {
                arabicTextTV.text = cursor.getString(cursor.getColumnIndex(DbHelper.COL_ARABIC1))
            } finally {
                cursor.close()
            }
        }

和现代方式：

        val cursor = context!!.getContentResolver().query(DbProvider.CONTENT_URI_VERSES, null, where, null, null)!!
        if (cursor.moveToFirst()) {
            cursor.use {
                arabicTextTV.text = cursor.getString(cursor.getColumnIndex(DbHelper.COL_ARABIC1))
            }
        }

Answer 1

context?.contentResolver?.query(DbProvider.CONTENT_URI_VERSES, null, where, null, null)?.use {
  if (it.moveToFirst()) {
    arabicTextTV.text = it.getString(it.getColumnIndex(DbHelper.COL_ARABIC1))
  }
}

https://kotlinlang.org/api/latest/jvm/stdlib/kotlin.io/use.html

Kotlin This Cursor 在使用#close 后应该被释放

Kotlin This Cursor should be freed up after use with #close

android

android-cursor

kotlin