/** * Author ： BlackHao * Time : 2018/10/26 10:46 * Description : 自定義 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);    //添加監聽    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;  }  /**   * 設置選中狀態   */  private void setCheck(@IdRes int checkId, boolean isChecked) {    if (checkId != -1 && this.checkId == checkId) {      return;    }    if (checkId != -1) {      CompoundButton view = (CompoundButton) findViewById(checkId);      //未選中的RadioButton被選中      if (checkId != this.checkId && isChecked) {        this.checkId = checkId;        if (mChildOnCheckedChangeListener != null) {          mChildOnCheckedChangeListener.onCheckedChanged(view, true);        }        //某個RadioButton被選中，將其他的改為未選中        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);          }        }      }      //被選中的RadioButton被取消選中      if (checkId == this.checkId && !isChecked) {        this.checkId = checkId;        if (mChildOnCheckedChangeListener != null) {          mChildOnCheckedChangeListener.onCheckedChanged(view, false);        }      }    } else {      //清空所有選擇      if (this.checkId != -1) {        this.checkId = -1;        CompoundButton view = (CompoundButton) findViewById(this.checkId);        //將選中的置為未選中        if (view instanceof RadioButton) {          view.setChecked(false);        }      }    }  }  public void setOnCheckedChangeListener(CompoundButton.OnCheckedChangeListener mChildOnCheckedChangeListener) {    this.mChildOnCheckedChangeListener = mChildOnCheckedChangeListener;  }}