Question

我想在画布上绘制一些线条和形状，然后在ImageView上将其转换为位图。我是一个习惯性的课程，可以使用＃34; View＆＃34;并在＆＃34; OnDraw方法中绘制线条。这是我的代码（这个类只绘制简单的行）：

public class finalDraw extends View {
        public finalDraw(Context context) {
            super(context);
        }

        @Override
        protected void onDraw(Canvas canvas) {
            super.onDraw(canvas);
            Paint paint = new Paint();
            paint.setColor(Color.BLUE);
            for (int i = 0; i <100; i++) {
                 canvas.drawLine(xStart * i + 50 , yStart , stopX + 30 , stopY,paint); 
            }

            invalidate();
        }
    }

如何获取绘图结果并在ImageView上显示？谢谢！

Answer 1

发现这篇文章可能有所帮助：http://www.informit.com/articles/article.aspx?p=2143148&seqNum=2

import org.apache.spark.{SparkContext, SparkConf}


object Main extends App {

  val data = List(
    "Bob,123,USA,Pizza,Soda,,Blue",
    "Bob,456,UK,Chocolate,Cheese,Soda,Green",
    "Bob,12,USA,Chocolate,Pizza,Soda,Yellow",
    "Mary,68,USA,Chips,Pasta,Chocolate,Blue")

  val sparkConf = new SparkConf().setMaster("local").setAppName("example")
  val sc = new SparkContext(sparkConf)

  val lineRDD = sc.parallelize(data)

  val pairedRDD = lineRDD.map { line =>
    val fields = line.split(",")
    (fields(0), List(fields(3), fields(4), fields(5)).filter(_ != ""))
  }.filter(_._1 == "Bob")

  /*pairedRDD.collect().foreach(println)
    (Bob,List(Pizza, Soda))
    (Bob,List(Chocolate, Cheese, Soda))
    (Bob,List(Chocolate, Pizza, Soda))
   */

  val flatPairsRDD = pairedRDD.flatMap {
    case (name, foodList) => foodList.map(food => ((name, food), 1))
  }

  /*flatPairsRDD.collect().foreach(println)
    ((Bob,Pizza),1)
    ((Bob,Soda),1)
    ((Bob,Chocolate),1)
    ((Bob,Cheese),1)
    ((Bob,Soda),1)
    ((Bob,Chocolate),1)
    ((Bob,Pizza),1)
    ((Bob,Soda),1)
   */

  val nameFoodSumRDD = flatPairsRDD.reduceByKey((a, b) => a + b)

  /*nameFoodSumRDD.collect().foreach(println)
    ((Bob,Cheese),1)
    ((Bob,Soda),3)
    ((Bob,Pizza),2)
    ((Bob,Chocolate),2)
   */

  val resultsRDD = nameFoodSumRDD.map{
    case ((name, food), count) => (name, (food,count))
  }.groupByKey.map{
    case (name, foodCountList) => (name, foodCountList.toList.sortBy(_._2).reverse.head)
  }

  resultsRDD.collect().foreach(println)
  /*
      (Bob,(Soda,3))
   */

  sc.stop()
}

Answer 2

使用Canvas(Bitmap bitmap)创建带位图的画布。所有绘制到该画布的都将在该位图中。

如何在画布上绘制并转换为位图？

2 个答案: