Android 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：

  <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"    />

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