iserbin · October 30, 2019 11:06 · Oct 1, 2018
diff --git a/MainActivity.kt b/MainActivity.kt
@@ -0,0 +1,91 @@
+package com.nezspencer.test
+
+import android.os.Bundle
+import android.support.annotation.NonNull
+import android.support.v7.app.AppCompatActivity
+import android.text.Editable
+import android.text.TextUtils
+import android.text.TextWatcher
+import android.widget.EditText
+import java.text.NumberFormat
+
+class MainActivity : AppCompatActivity() {
+
+    var beforeText : String = ""
+    override fun onCreate(savedInstanceState: Bundle?) {
+        super.onCreate(savedInstanceState)
+        setContentView(R.layout.activity_main)
+        val editText = findViewById<EditText>(R.id.et_amount)
+        editText.addTextChangedListener(object : TextWatcher {
+            override fun afterTextChanged(p0: Editable?) {
+            }
+
+            override fun beforeTextChanged(p0: CharSequence?, start: Int, count: Int, after: Int) {
+                beforeText = p0.toString()
+            }
+
+            override fun onTextChanged(p0: CharSequence?, start: Int, before: Int, count: Int) {
+
+                if (p0 == null)
+                    return
+                // 1. get cursor position : p0 = start + before
+                val initialCursorPosition = start + before
+                //2. get digit count after cursor position : c0
+                val numOfDigitsToRightOfCursor = getNumberOfDigits(beforeText.substring(initialCursorPosition,
+                        beforeText.length))
+                val newAmount = formatAmount(p0.toString())
+                editText.removeTextChangedListener(this)
+                editText.setText(newAmount)
+                //set new cursor position
+                editText.setSelection(getNewCursorPosition(numOfDigitsToRightOfCursor, newAmount))
+                editText.addTextChangedListener(this)
+
+
+
+            }
+
+        })
+
+    }
+
+    fun formatAmount(@NonNull amount: String): String {
+
+        val result = removeNonNumeric(amount)
+        val amt = if (!TextUtils.isEmpty(result) && TextUtils.isDigitsOnly(result)) result.toLong() else 0
+        val formatter = NumberFormat.getNumberInstance()
+        return getString(R.string.naira).plus(formatter.format(amt))
+    }
+
+    private fun removeNonNumeric(@NonNull numberString: String) : String {
+        var numbers : String = ""
+        for (i in numberString){
+            if (i.isDigit())
+                numbers += i
+        }
+        return numbers
+    }
+
+    private fun getNewCursorPosition(digitCountToRightOfCursor : Int, numberString : String) : Int{
+        var position = 0
+        var c = digitCountToRightOfCursor
+        for (i in numberString.reversed()) {
+            if (c == 0)
+                break
+
+            if (i.isDigit())
+                c --
+            position ++
+
+
+        }
+        return numberString.length - position
+    }
+
+    private fun getNumberOfDigits(@NonNull text : String) : Int{
+        var count = 0
+        for (i in text)
+            if (i.isDigit())
+                count++
+        return count
+    }
+}
No results found