android 文字竖排

package com.example.verticaltext;

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);
	}
}

  <com.example.verticaltext.VerticalTextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:gravity="bottom"
        android:text="VerticalTextView"
        android:textSize="40sp" >
   </com.example.verticaltext.VerticalTextView>

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