Android 自定义View实现任意布局的RadioGroup效果

前言

radiogroup是继承linearlayout，只支持横向或者竖向两种布局。所以在某些情况，比如多行多列布局，radiogroup就并不适用 。

本篇文章通过继承relativelayout实现自定义radiogroup，实现radiobutton的任意布局。效果图如下：

代码(relativeradiogroup)

/**
 * author ： blackhao
 * time : 2018/10/26 10:46
 * description : 自定义 radiogroup
 */
public class relativeradiogroup extends relativelayout implements compoundbutton.oncheckedchangelistener {
  private int checkid = -1;
  private compoundbutton.oncheckedchangelistener mchildoncheckedchangelistener;
  public relativeradiogroup(context context) {
    super(context);
  }
  public relativeradiogroup(context context, attributeset attrs) {
    super(context, attrs);
  }
  public relativeradiogroup(context context, attributeset attrs, int defstyleattr) {
    super(context, attrs, defstyleattr);
  }
  @override
  protected void onlayout(boolean changed, int l, int t, int r, int b) {
    super.onlayout(changed, l, t, r, b);
    //添加监听
    for (int i = 0; i < getchildcount(); i++) {
      view v = getchildat(i);
      if (v instanceof radiobutton && !(v instanceof compoundbutton.oncheckedchangelistener)) {
        ((radiobutton) v).setoncheckedchangelistener(this);
      }
    }
  }
  @override
  public void oncheckedchanged(compoundbutton buttonview, boolean ischecked) {
    setcheck(buttonview.getid(), ischecked);
  }
  public void check(@idres int checkid) {
    if (checkid == -1 || this.checkid == checkid) {
      return;
    }
    setcheck(checkid, true);
  }
  public void clearcheck() {
    setcheck(-1, false);
  }
  public int getcheckedradiobuttonid() {
    return this.checkid;
  }
  /**
   * 设置选中状态
   */
  private void setcheck(@idres int checkid, boolean ischecked) {
    if (checkid != -1 && this.checkid == checkid) {
      return;
    }
    if (checkid != -1) {
      compoundbutton view = (compoundbutton) findviewbyid(checkid);
      //未选中的radiobutton被选中
      if (checkid != this.checkid && ischecked) {
        this.checkid = checkid;
        if (mchildoncheckedchangelistener != null) {
          mchildoncheckedchangelistener.oncheckedchanged(view, true);
        }
        //某个radiobutton被选中，将其他的改为未选中
        for (int i = 0; i < getchildcount(); i++) {
          view v = getchildat(i);
          if (v instanceof radiobutton && v.getid() != checkid) {
            ((radiobutton) v).setchecked(false);
          } else if (v instanceof radiobutton && v.getid() == checkid) {
            ((radiobutton) v).setchecked(true);
          }
        }
      }
      //被选中的radiobutton被取消选中
      if (checkid == this.checkid && !ischecked) {
        this.checkid = checkid;
        if (mchildoncheckedchangelistener != null) {
          mchildoncheckedchangelistener.oncheckedchanged(view, false);
        }
      }
    } else {
      //清空所有选择
      if (this.checkid != -1) {
        this.checkid = -1;
        compoundbutton view = (compoundbutton) findviewbyid(this.checkid);
        //将选中的置为未选中
        if (view instanceof radiobutton) {
          view.setchecked(false);
        }
      }
    }
  }
  public void setoncheckedchangelistener(compoundbutton.oncheckedchangelistener mchildoncheckedchangelistener) {
    this.mchildoncheckedchangelistener = mchildoncheckedchangelistener;
  }
}

代码并没有太多，也很容易理解。有什么不明白的可以留言。

1、下载地址 ： https://github.com/luochen-hao/blackhaocustomview

总结

以上所述是小编给大家介绍的android 自定义view实现任意布局的radiogroup效果，希望对大家有所帮助