[android] How do I access call log for android?

If we use Kotlin it is shorter. Example of class which responds for provide call logs:

import android.content.Context
import android.database.Cursor
import android.provider.CallLog.Calls.*

class CallsLoader {

    fun getCallLogs(context: Context): List<List<String?>> {
        val c = context.applicationContext
        val projection = arrayOf(CACHED_NAME, NUMBER, TYPE, DATE, DURATION)

        val cursor = c.contentResolver.query(
             CONTENT_URI,
             projection,
             null,
             null,
             null,
             null
          )

         return cursorToMatrix(cursor)
     }

    private fun cursorToMatrix(cursor: Cursor?): List<List<String?>> {
        val matrix = mutableListOf<List<String?>>()
        cursor?.use {
             while (it.moveToNext()) {
                 val list = listOf(
                    it.getStringFromColumn(CACHED_NAME),
                    it.getStringFromColumn(NUMBER),
                    it.getStringFromColumn(TYPE),
                    it.getStringFromColumn(DATE),
                    it.getStringFromColumn(DURATION)
                 )

                 matrix.add(list.toList())
             }
          }

          return matrix
      }

     private fun Cursor.getStringFromColumn(columnName: String) =
        getString(getColumnIndex(columnName))
}

We can also convert cursor to map:

fun getCallLogs(context: Context): Map<String, Array<String?>> {
    val c = context.applicationContext
    val projection = arrayOf(CACHED_NAME, NUMBER, TYPE, DATE, DURATION)

    val cursor = c.contentResolver.query(
        CONTENT_URI,
        projection,
        null,
        null,
        null,
        null
    )

    return cursorToMap(cursor)
}

private fun cursorToMap(cursor: Cursor?): Map<String, Array<String?>> {
    val arraySize = cursor?.count ?: 0
    val map = mapOf(
        CACHED_NAME to Array<String?>(arraySize) { "" },
        NUMBER to Array<String?>(arraySize) { "" },
        TYPE to Array<String?>(arraySize) { "" },
        DATE to Array<String?>(arraySize) { "" },
        DURATION to Array<String?>(arraySize) { "" }
    )

    cursor?.use {
        for (i in 0 until arraySize) {
            it.moveToNext()

            map[CACHED_NAME]?.set(i, it.getStringFromColumn(CACHED_NAME))
            map[NUMBER]?.set(i, it.getStringFromColumn(NUMBER))
            map[TYPE]?.set(i, it.getStringFromColumn(TYPE))
            map[DATE]?.set(i, it.getStringFromColumn(DATE))
            map[DURATION]?.set(i, it.getStringFromColumn(DURATION))
        }
    }

    return map
}