android绘制几何图形的实例代码

本文实例为大家分享了android绘制几何图形展示的具体代码，供大家参考，具体内容如下

效果图：

代码（仅绘制类，不可直接运行）：

public class MyView extends View
{
  public MyView(Context context, AttributeSet set)
  {
    super(context, set);
  }
  @Override
  // 重写该方法，进行绘图
  protected void onDraw(Canvas canvas)
  {
    super.onDraw(canvas);
    // 把整张画布绘制成白色
    canvas.drawColor(Color.WHITE);
    Paint paint = new Paint();//创建一个画笔对象
    // 去锯齿
    paint.setAntiAlias(true);
    paint.setColor(Color.BLUE);//设置画笔颜色为蓝色
    paint.setStyle(Paint.Style.STROKE);//设置样式
    paint.setStrokeWidth(3);//设置样式的宽度
    // 绘制圆形
    canvas.drawCircle(40, 40, 30, paint);
    // 绘制正方形
    canvas.drawRect(10, 80, 70, 140, paint);
    // 绘制矩形
    canvas.drawRect(10, 150, 70, 190, paint);
    RectF re1 = new RectF(10, 200, 70, 230);
    // 绘制圆角矩形
    canvas.drawRoundRect(re1, 15, 15, paint);
    RectF re11 = new RectF(10, 240, 70, 270);
    // 绘制椭圆
    canvas.drawOval(re11, paint);
    // 定义一个Path对象，封闭成一个三角形。
    Path path1 = new Path();
    path1.moveTo(10, 340);//将路径点设置到10，340位置
    path1.lineTo(70, 340);//将起始路径点连接都70,340位置
    path1.lineTo(40, 290);//将第二连接点连接到40,290位置
    path1.close();//关闭路径的绘制
    // 根据Path进行绘制，绘制三角形
    canvas.drawPath(path1, paint);
    // 定义一个Path对象，封闭成一个五角形。
    Path path2 = new Path();
    path2.moveTo(26, 360);
    path2.lineTo(54, 360);
    path2.lineTo(70, 392);
    path2.lineTo(40, 420);
    path2.lineTo(10, 392);
    path2.close();
    // 根据Path进行绘制，绘制五角形
    canvas.drawPath(path2, paint);
    // ----------设置填充风格后绘制----------
    paint.setStyle(Paint.Style.FILL);
    paint.setColor(Color.RED);
    canvas.drawCircle(120, 40, 30, paint);
    //绘制正方形
    canvas.drawRect(90, 80, 150, 140, paint);
    //绘制矩形
    canvas.drawRect(90, 150, 150, 190, paint);
    RectF re2 = new RectF(90, 200, 150, 230);
    //绘制圆角矩形
    canvas.drawRoundRect(re2, 15, 15, paint);
    RectF re21 = new RectF(90, 240, 150, 270);
    // 绘制椭圆
    canvas.drawOval(re21, paint);
    Path path3 = new Path();
    path3.moveTo(90, 340);
    path3.lineTo(150, 340);
    path3.lineTo(120, 290);
    path3.close();
    //绘制三角形
    canvas.drawPath(path3, paint);
    Path path4 = new Path();
    path4.moveTo(106, 360);
    path4.lineTo(134, 360);
    path4.lineTo(150, 392);
    path4.lineTo(120, 420);
    path4.lineTo(90, 392);
    path4.close();
    //绘制五角形
    canvas.drawPath(path4, paint);
    // ----------设置渐变器后绘制----------
    // 为Paint设置渐变器
    Shader mShader = new LinearGradient(0, 0, 40, 60
      , new int[] {
      Color.RED, Color.GREEN, Color.BLUE, Color.YELLOW }
      , null , Shader.TileMode.REPEAT);
    paint.setShader(mShader);
    //设置阴影
    paint.setShadowLayer(45 , 10 , 10 , Color.GRAY);
    // 绘制圆形
    canvas.drawCircle(200, 40, 30, paint);
    // 绘制正方形
    canvas.drawRect(170, 80, 230, 140, paint);
    // 绘制矩形
    canvas.drawRect(170, 150, 230, 190, paint);
    RectF re3 = new RectF(170, 200, 230, 230);
    // 绘制圆角矩形
    canvas.drawRoundRect(re3, 15, 15, paint);
    RectF re31 = new RectF(170, 240, 230, 270);
    // 绘制椭圆
    canvas.drawOval(re31, paint);
    Path path5 = new Path();
    path5.moveTo(170, 340);
    path5.lineTo(230, 340);
    path5.lineTo(200, 290);
    path5.close();
    // 根据Path进行绘制，绘制三角形
    canvas.drawPath(path5, paint);
    Path path6 = new Path();
    path6.moveTo(186, 360);
    path6.lineTo(214, 360);
    path6.lineTo(230, 392);
    path6.lineTo(200, 420);
    path6.lineTo(170, 392);
    path6.close();
    // 根据Path进行绘制，绘制五角形
    canvas.drawPath(path6, paint);
    // ----------设置字符大小后绘制----------
    paint.setTextSize(24);
    paint.setShader(null);
    // 绘制7个字符串
    canvas.drawText(getResources().getString(R.string.circle), 240, 50,
      paint);
    canvas.drawText(getResources().getString(R.string.square), 240, 120,
      paint);
    canvas.drawText(getResources().getString(R.string.rect), 240, 175,
      paint);
    canvas.drawText(getResources().getString(R.string.round_rect), 230,
      220, paint);
    canvas.drawText(getResources().getString(R.string.oval), 240,
      260, paint);
    canvas.drawText(getResources().getString(R.string.triangle), 240, 325,
      paint);
    canvas.drawText(getResources().getString(R.string.pentagon), 240, 390,
      paint);
  }
} 

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