Android(安卓)Vertical TextView 文字竖排

竖排文字控件：

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);   }}

这样使用来实现文字靠左靠上对齐：

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