Android自定view画圆效果

这是一个自定义view画圆，对于初学自定义view的小伙伴这是一个很好的帮助。

看图

代码：

package sjx.com.custonview;
import android.content.context;
import android.graphics.canvas;
import android.graphics.color;
import android.graphics.paint;
import android.support.annotation.nullable;
import android.util.attributeset;
import android.util.log;
import android.view.motionevent;
import android.view.view;
import android.view.window;

/**
 * dell 孙劲雄
 * 2017/9/1
 * 19:57
 */

public class custonm extends view {
  private float currentx = 40;
  private float currenty = 50;
  public custonm(context context) {
    super(context);
  }

  public custonm(context context, attributeset attrs) {
    super(context, attrs);
  }

  public custonm(context context, attributeset attrs, int defstyleattr) {
    super(context, attrs, defstyleattr);
  }
//测量
  @override
  protected void onmeasure(int widthmeasurespec, int heightmeasurespec) {
    super.onmeasure(widthmeasurespec, heightmeasurespec);
  }
//摆放
  @override
  protected void onlayout(boolean changed, int left, int top, int right, int bottom) {

    super.onlayout(changed, left, top, right, bottom);

  }

  @override
  protected void ondraw(canvas canvas) {
    super.ondraw(canvas);




    paint paint=new paint();

    paint.setcolor(color.red);

    paint.setstyle(paint.style.fill);

    paint.setantialias(true);


    canvas.drawcircle(currentx,currenty,30,paint);

  }

  @override
  public boolean dispatchtouchevent(motionevent event) {
    return super.dispatchtouchevent(event);
  }

  @override
  public boolean ontouchevent(motionevent event) {

    currentx=event.getx();
    currenty=event.gety();

    invalidate();

    switch (event.getaction()){

      case motionevent.action_down:
        log.i("sss", "按下");
        break;
      case motionevent.action_move:
        log.i("sss", "移动");

        break;
      case motionevent.action_up:
        log.i("sss", "弹起");
        break;
    }
    return true;


  }
}

以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持。