面试例题4：绘制5行文本，每一行的字体大小逐渐增加

题目来自：《android高薪之路—android程序员面试宝典》一书  ，只是为了个人学习方便

实现如图效果：

 

使用Canvas.drawText方法绘制5行文本，每一行的字体大小逐渐增加

 

package com.app;

import android.content.Context;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.view.View;

public class DrawTextView extends View{
       private Paint paint = null;
       int y = 0;
       public DrawTextView(Context context) {
             super(context);
             paint = new Paint();
      }

       @Override
       protected void onDraw(Canvas canvas) {
             super.onDraw(canvas);
             float textSizeArray[]=new float[]{15,18,21,24,27};
             for(int i=0;i<textSizeArray.length;i++){
                   paint.setTextSize(textSizeArray[i]);
                   paint.setColor(Color.BLUE);
                   //获取文本的宽度可以用measureText方法
                   //public void drawText(String text, float x, float y, Paint paint)
                   //Parameters
                   //      text:The text to be drawn
                   //          x :The x-coordinate of the origin of the text being drawn
                   //          y :The y-coordinate of the origin of the text being drawn
                   //    paint :The paint used for the text (e.g. color, size, style)

                  canvas.drawText( "Android(宽度:" +paint .measureText("Android")+ ")", 0, 50+y , paint );

                   //每行文字距离5个像素
                   y+= paint.getTextSize()+5;
            }
      }
}