TitledEditText allows to write a large font sized title with a content like done in SimpleNote.

TitledEditText.java

import android.content.Context;
import android.text.Editable;
import android.text.Spannable;
import android.text.TextWatcher;
import android.text.style.RelativeSizeSpan;
import android.util.AttributeSet;
import android.widget.EditText;

public class TitledEditText extends EditText implements TextWatcher{
    
    private final String LINE_SEPERTAOR = "\n";
    
    public TitledEditText(Context context) {
        super(context);
        initialize();
    }

    public TitledEditText(Context context, AttributeSet attrs) {
        super(context, attrs);
        initialize();
    }

    public TitledEditText(Context context, AttributeSet attrs, int defStyleAttr) {
        super(context, attrs, defStyleAttr);
        initialize();
    }

    private void initialize() {
        addTextChangedListener(this);
    }

    private void makeSpannableTitle(Editable editable) {
        RelativeSizeSpan[] relativeSizeSpans = editable.getSpans(0, editable.length(), RelativeSizeSpan.class);
        for (int i = 0; i < relativeSizeSpans.length; i++) {
            editable.removeSpan(relativeSizeSpans[i]);
        }

        int lineSeperatorIndex = findFirstLineSeperatorIndex(editable);
        int spanEndIndex = (lineSeperatorIndex == -1 ? editable.length() : lineSeperatorIndex);
        
        if (spanEndIndex != 0) {
            RelativeSizeSpan localRelativeSizeSpan = new RelativeSizeSpan(1.3F);
            editable.setSpan(localRelativeSizeSpan, 0, spanEndIndex, Spannable.SPAN_INCLUSIVE_INCLUSIVE);
        }
    }
    
    private int findFirstLineSeperatorIndex(Editable editable){
        if(editable != null) {
            return editable.toString().indexOf(LINE_SEPERTAOR);
        } else {
            return getText().toString().indexOf(LINE_SEPERTAOR);
        }
    }

    @Override
    public void beforeTextChanged(CharSequence charSequence, int i, int i2, int i3) {

    }

    @Override
    public void afterTextChanged(Editable editable) {
        makeSpannableTitle(editable);
    }

    @Override
    public void onTextChanged(CharSequence text, int start, int lengthBefore, int lengthAfter) {
        super.onTextChanged(text, start, lengthBefore, lengthAfter);
    }
    
    public String getTitle(){
        int lineSeperatorIndex = findFirstLineSeperatorIndex(getText());
        if(lineSeperatorIndex != -1){
            return getText().subSequence(0, lineSeperatorIndex).toString();
        } else {
            return "";
        }
    }
    
    public String getContent(){
        int lineSeperatorIndex = findFirstLineSeperatorIndex(getText());
        if(lineSeperatorIndex == -1) { 
            return ""; 
        } else {
            return getText().subSequence(lineSeperatorIndex + 1, length() - 1).toString();
        }
    }
}