This video shows the steps to create a text editor App in very simple approach.

In this tutorial, it shows how once can make the selected text in the Edit Text or multiline Text box as Bold, Italics or underline. It also shows how to remove any kind of formatting done in the text editor.

It further shows how one can align the text in the multiline text box to Left, Center or Right.

For setting the style of the selected text it uses Spannable APIs of Android. However, for setting the alignment, it uses setTextAlignment property (attribute) of the Multiline Text.

However, the Java source code is pasted below also for reference:

package com.programmerworld.texteditorapp;

import androidx.appcompat.app.AppCompatActivity;

import android.graphics.Typeface;
import android.os.Bundle;
import android.text.Spannable;
import android.text.SpannableStringBuilder;
import android.text.style.StyleSpan;
import android.text.style.UnderlineSpan;
import android.view.View;
import android.widget.EditText;

public class MainActivity extends AppCompatActivity {

 @Override
 protected void onCreate(Bundle savedInstanceState) {
     super.onCreate(savedInstanceState);
     setContentView(R.layout.activity_main);

     editText = findViewById(R.id.editTextTextMultiLine);
 }

 public void buttonBold(View view){
     Spannable spannableString = new SpannableStringBuilder(editText.getText());
     spannableString.setSpan(new StyleSpan(Typeface.BOLD),
             editText.getSelectionStart(),
             editText.getSelectionEnd(),
             0);

     editText.setText(spannableString);
 }
 public void buttonItalics(View view){
     Spannable spannableString = new SpannableStringBuilder(editText.getText());
     spannableString.setSpan(new StyleSpan(Typeface.ITALIC),
             editText.getSelectionStart(),
             editText.getSelectionEnd(),
             0);

     editText.setText(spannableString);

 }
 public void buttonUnderline(View view){
     Spannable spannableString = new SpannableStringBuilder(editText.getText());
     spannableString.setSpan(new UnderlineSpan(),
             editText.getSelectionStart(),
             editText.getSelectionEnd(),
             0);

     editText.setText(spannableString);
 }

 public void buttonNoFormat(View view){
     String stringText = editText.getText().toString();
     editText.setText(stringText);
 }


 public void buttonAlignmentLeft(View view){
     editText.setTextAlignment(View.TEXT_ALIGNMENT_TEXT_START);
     Spannable spannableString = new SpannableStringBuilder(editText.getText());
     editText.setText(spannableString);
 }

 public void buttonAlignmentCenter(View view){
     editText.setTextAlignment(View.TEXT_ALIGNMENT_CENTER);
     Spannable spannableString = new SpannableStringBuilder(editText.getText());
     editText.setText(spannableString);
 }

 public void buttonAlignmentRight(View view){
     editText.setTextAlignment(View.TEXT_ALIGNMENT_TEXT_END);
     Spannable spannableString = new SpannableStringBuilder(editText.getText());
     editText.setText(spannableString);
 }
}

#android #app #mobile-apps