Mobile App Dev 2022W: Tutorial 6

In this tutorial you will be playing with textanalyzer-5, which implements the same text analyzer functionality as Tutorial 2's textanalyzer-1, [Mobile App Dev 2022W: Assignment 1|Assignment 1's textanalyzer-2], and Tutorial 5. This version, however, is an Android app.

textanalyzer-5 Code

MainActivity.kt

package carleton.comp1601.textanalyzer5

import androidx.appcompat.app.AppCompatActivity
import android.os.Bundle
import android.text.Editable
import android.text.TextWatcher
import android.view.MenuItem
import android.view.View
import android.widget.Button
import android.widget.EditText
import android.widget.TextView
import androidx.appcompat.widget.PopupMenu
import kotlin.reflect.KFunction1

class MainActivity : AppCompatActivity() {
    private lateinit var t: EditText
    private lateinit var analysisResult: TextView

    var analysisMode = "None"

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_main)

        t = findViewById(R.id.t)
        t.addTextChangedListener(twatcher)

        analysisResult = findViewById(R.id.analysisResult)
        updateAnalysis()
    }

    fun onMenuItemClick(choice: MenuItem): Boolean {
        analysisMode = choice.getTitle() as String
        updateAnalysis()
        return true
    }

    // https://stackoverflow.com/questions/15580111/
    fun showMenu(v: View) {
        val menu = PopupMenu(this, v)

        for (s in analysis.keys) {
            menu.menu.add(s)
        }

        menu.setOnMenuItemClickListener(::onMenuItemClick)
        menu.show()
    }

    private val twatcher = object : TextWatcher {
        override fun afterTextChanged(s: Editable) {
            updateAnalysis()
        }

        override fun beforeTextChanged(s: CharSequence?, start: Int, count: Int, after: Int) {
        }

        override fun onTextChanged(s: CharSequence?, start: Int, before: Int, count: Int) {
        }
    }

    fun updateAnalysis() {
        val inputText: Editable? = t.text

        if (inputText != null)  {
            val analysisFunc: KFunction1<String, String>? = analysis[analysisMode]
            if (analysisFunc != null)  {
                val r = analysisFunc(inputText.toString())
                analysisResult.setText(analysisMode + ": " + r)
            } else {
                analysisResult.setText("Please choose an analysis mode.")
            }
        }
    }
}

fun countUpper(s: String): String {
    var count = 0
    val upperCase = setOf("A","B","C","D","E","F","G","H","I","J","K","L","M",
            "N","O","P","Q","R","S","T","U","V","W","X","Y","Z")
    for (c in s) {
        if (upperCase.contains(c.toString())) {
            count += 1
        }
    }
    return count.toString()
}

fun countCharacters(s: String): String {
    val charcount = s.length
    return charcount.toString()
}

val analysis: MutableMap<String, KFunction1<String, String>> = mutableMapOf(
    "Count" to ::countCharacters,
    "Upper Case" to ::countUpper
)