Shows live character counter for the number of characters typed in the parameter android.widget.EditText - Android User Interface

Android examples for User Interface:EditText

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Description

Shows live character counter for the number of characters typed in the parameter android.widget.EditText

Demo Code


//package com.java2s;

import android.text.Editable;
import android.text.InputFilter;
import android.text.TextWatcher;

import android.widget.EditText;
import android.widget.TextView;

public class Main {
    /**// w  w w  .  j  a  v  a  2  s.  c o m
     * Shows live character counter for the number of characters typed in the parameter {@link android.widget.EditText}
     *
     * @param editTextView Characters to count from
     * @param textCounterView {@link android.widget.TextView} to show live character count in
     * @param maxCharCount Max characters that can be typed in into the parameter edittext
     * @param countdown if true, only the remaining of the max character count will be displayed. If false,
     * current character count as well as max character count will be displayed in the UI.
     ****/
    public static void setLiveCharCounter(EditText editTextView,
            final TextView textCounterView, final int maxCharCount,
            final boolean countdown) {

        if (editTextView == null) {
            throw new NullPointerException(
                    "View to count text characters on cannot be null");
        }

        if (textCounterView == null) {
            throw new NullPointerException(
                    "View to display count cannot be null");
        }

        // initialize the TextView initial state
        if (countdown) {
            textCounterView.setText(String.valueOf(maxCharCount));
        } else {
            textCounterView.setText(String.valueOf("0 / " + maxCharCount));
        }

        // initialize the edittext
        setMaxLength(editTextView, maxCharCount);

        editTextView.addTextChangedListener(new TextWatcher() {
            public void beforeTextChanged(CharSequence s, int start,
                    int count, int after) {

            }

            public void onTextChanged(CharSequence s, int start,
                    int before, int count) {

                if (countdown) {
                    // show only the remaining number of characters
                    int charsLeft = maxCharCount - s.length();

                    if (charsLeft >= 0) {
                        textCounterView.setText(String.valueOf(charsLeft));
                    }
                } else {
                    // show number of chars / maxChars in the UI
                    textCounterView.setText(s.length() + " / "
                            + maxCharCount);
                }

            }

            public void afterTextChanged(Editable s) {

            }
        });
    }

    /**
     * Set max text length for textview
     ****/
    public static void setMaxLength(TextView textView, int maxLength) {

        if (textView == null) {
            throw new NullPointerException("TextView cannot be null");
        }

        InputFilter[] fArray = new InputFilter[1];
        fArray[0] = new InputFilter.LengthFilter(maxLength);
        textView.setFilters(fArray);
    }
}

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