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, 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
)

activity_main.xml

<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".MainActivity">

    <Button
        android:id="@+id/analysisMenuButton"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginTop="26dp"
        android:onClick="showMenu"
        android:text="Analysis Mode"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent" />

    <TextView
        android:id="@+id/appTitle"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Text Analyzer"
        android:textAppearance="@style/TextAppearance.AppCompat.Display2"
        android:textStyle="bold"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toBottomOf="@+id/analysisMenuButton"
        app:layout_constraintBottom_toTopOf="@id/t"
        />

    <EditText
        android:id="@+id/t"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:ems="20"
        android:hint="Enter Text"
        android:inputType="text"
        android:minHeight="48dp"
        android:textAppearance="@style/TextAppearance.AppCompat.Body2"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent" />

    <TextView
        android:id="@+id/analysisResult"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginTop="32dp"
        android:text="Result Area"
        android:textAppearance="@style/TextAppearance.AppCompat.Medium"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toBottomOf="@+id/t"
        app:layout_constraintBottom_toBottomOf="parent"/>

</androidx.constraintlayout.widget.ConstraintLayout>