Custom Edittext with Line Number

readme.md

Custom Edittext with Line Number

main.xml

<ScrollView xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:paddingBottom="@dimen/activity_vertical_margin"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    tools:context=".MainActivity">

    <rupantor.cusedittext.MyEditText
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="@string/hello_world" />

</ScrollView>

MyEditText.java

package rupantor.cusedittext;

import android.content.Context;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.graphics.Rect;
import android.util.AttributeSet;
import android.widget.EditText;

/**
 * Author S Mahbub Uz Zaman on 5/9/15.
 * Lisence Under GPL2
 */
public class MyEditText extends EditText {

    private Rect rect;
    private Paint paint;

    public MyEditText(Context context, AttributeSet attrs) {
        super(context, attrs);
        rect = new Rect();
        paint = new Paint();
        paint.setStyle(Paint.Style.FILL);
        paint.setColor(Color.BLACK);
        paint.setTextSize(20);
    }

    @Override
    protected void onDraw(Canvas canvas) {
        int baseline = getBaseline();
        for (int i = 0; i < getLineCount(); i++) {
            canvas.drawText("" + (i+1), rect.left, baseline, paint);
            baseline += getLineHeight();
        }
        super.onDraw(canvas);
    }
}

If the code is longer then 100 lines, the text becomes to appear over the line numbers...

I think, we should set left padding to adjust automatically!

how can i change line numbers direction from left to right?

@francisnnumbi i dont have any problem? on which api version you have problem?

Change extends EditText to extends android.support.v7.widget.AppCompatEditText, change getBaseline() to getBaseline();. You need change the color for custom style color text.