Android 自定义View实现任意布局的RadioGroup效果

/**
 * 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;
  }
}