Android vertical textview text vertical bar

Vertical text control:

package com.howfun.test;import android.content.Context;import android.graphics.Canvas;import android.util.AttributeSet;import android.view.Gravity;import android.widget.TextView;public class VerticalTextView extends TextView{   final boolean topDown;   public VerticalTextView(Context context, AttributeSet attrs){      super(context, attrs);      final int gravity = getGravity();      if(Gravity.isVertical(gravity) && (gravity&Gravity.VERTICAL_GRAVITY_MASK) == Gravity.BOTTOM) {         setGravity((gravity&Gravity.HORIZONTAL_GRAVITY_MASK) | Gravity.TOP);         topDown = false;      }else         topDown = true;   }   @Override   protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec){      super.onMeasure(heightMeasureSpec, widthMeasureSpec);      setMeasuredDimension(getMeasuredHeight(), getMeasuredWidth());   }   @Override   protected boolean setFrame(int l, int t, int r, int b){      return super.setFrame(l, t, l+(b-t), t+(r-l));   }   @Override   public void draw(Canvas canvas){      if(topDown){         canvas.translate(getHeight(), 0);         canvas.rotate(90);      }else {         canvas.translate(0, getWidth());         canvas.rotate(-90);      }      canvas.clipRect(0, 0, getWidth(), getHeight(), android.graphics.Region.Op.REPLACE);      super.draw(canvas);   }}

To align the text on the left:

    <com.howfun.test.VerticalTextView        android:layout_width="450dp"        android:layout_height="450dp"        android:textSize="40sp"        android:layout_marginLeft="100dp"        android:gravity="bottom|right"        android:text="Vertical text"        />