content: package com.faceunity.fulivedemo.ui;
  
  import android.content.Context;
  import android.support.annotation.IdRes;
  import android.util.AttributeSet;
  import android.view.View;
  import android.view.ViewGroup;
  import android.widget.CheckBox;
  import android.widget.CompoundButton;
  import android.widget.LinearLayout;
  
  /**
   * Created by tujh on 2018/4/17.
   */
  public class CheckGroup extends LinearLayout {
      private static final String LOG_TAG = CheckGroup.class.getSimpleName();
  
      // holds the checked id; the selection is empty by default
      private int mCheckedId = View.NO_ID;
      // tracks children radio buttons checked state
      private CompoundButton.OnCheckedChangeListener mChildOnCheckedChangeListener;
      // when true, mOnCheckedChangeListener discards events
      private boolean mProtectFromCheckedChange = false;
      private OnCheckedChangeListener mOnCheckedChangeListener;
      private PassThroughHierarchyChangeListener mPassThroughListener;
  
      /**
       * {@inheritDoc}
       */
      public CheckGroup(Context context) {
          super(context);
          setOrientation(VERTICAL);
          init();
      }
  
      /**
       * {@inheritDoc}
       */
      public CheckGroup(Context context, AttributeSet attrs) {
          super(context, attrs);
          init();
      }
  
      private void init() {
          mChildOnCheckedChangeListener = new CheckedStateTracker();
          mPassThroughListener = new PassThroughHierarchyChangeListener();
          super.setOnHierarchyChangeListener(mPassThroughListener);
      }
  
      /**
       * {@inheritDoc}
       */
      @Override
      public void setOnHierarchyChangeListener(OnHierarchyChangeListener listener) {
          // the user listener is delegated to our pass-through listener
          mPassThroughListener.mOnHierarchyChangeListener = listener;
      }
  
      /**
       * {@inheritDoc}
       */
      @Override
      protected void onFinishInflate() {
          super.onFinishInflate();
  
          // checks the appropriate radio button as requested in the XML file
          if (mCheckedId != View.NO_ID) {
              mProtectFromCheckedChange = true;
              setCheckedStateForView(mCheckedId, true);
              mProtectFromCheckedChange = false;
              setCheckedId(mCheckedId);
          }
      }
  
      @Override
      public void addView(View child, int index, ViewGroup.LayoutParams params) {
          if (child instanceof CheckBox) {
              final CheckBox button = (CheckBox) child;
              if (button.isChecked()) {
                  mProtectFromCheckedChange = true;
                  if (mCheckedId != View.NO_ID) {
                      setCheckedStateForView(mCheckedId, false);
                  }
                  mProtectFromCheckedChange = false;
                  setCheckedId(button.getId());
              }
          }
  
          super.addView(child, index, params);
      }
  
      /**
       * <p>Sets the selection to the radio button whose identifier is passed in
       * parameter. Using View.NO_ID as the selection identifier clears the selection;
       * such an operation is equivalent to invoking {@link #clearCheck()}.</p>
       *
       * @param id the unique id of the radio button to select in this group
       * @see #getCheckedCheckBoxId()
       * @see #clearCheck()
       */
      public void check(@IdRes int id) {
          // don't even bother
          if (id != View.NO_ID && (id == mCheckedId)) {
              return;
          }
  
          if (mCheckedId != View.NO_ID) {
              setCheckedStateForView(mCheckedId, false);
          }
  
          if (id != View.NO_ID) {
              setCheckedStateForView(id, true);
          }
  
          setCheckedId(id);
      }
  
      private void setCheckedId(@IdRes int id) {
          mCheckedId = id;
          if (mOnCheckedChangeListener != null) {
              mOnCheckedChangeListener.onCheckedChanged(this, mCheckedId);
          }
      }
  
      private void setCheckedStateForView(int viewId, boolean checked) {
          View checkedView = findViewById(viewId);
          if (checkedView != null && checkedView instanceof CheckBox) {
              ((CheckBox) checkedView).setChecked(checked);
          }
      }
  
      /**
       * <p>Returns the identifier of the selected radio button in this group.
       * Upon empty selection, the returned value is View.NO_ID.</p>
       *
       * @return the unique id of the selected radio button in this group
       * @attr ref android.R.styleable#CheckGroup_checkedButton
       * @see #check(int)
       * @see #clearCheck()
       */
      @IdRes
      public int getCheckedCheckBoxId() {
          return mCheckedId;
      }
  
      /**
       * <p>Clears the selection. When the selection is cleared, no radio button
       * in this group is selected and {@link #getCheckedCheckBoxId()} returns
       * null.</p>
       *
       * @see #check(int)
       * @see #getCheckedCheckBoxId()
       */
      public void clearCheck() {
          check(View.NO_ID);
      }
  
      /**
       * <p>Register a callback to be invoked when the checked radio button
       * changes in this group.</p>
       *
       * @param listener the callback to call on checked state change
       */
      public void setOnCheckedChangeListener(OnCheckedChangeListener listener) {
          mOnCheckedChangeListener = listener;
      }
  
      @Override
      public CharSequence getAccessibilityClassName() {
          return CheckGroup.class.getName();
      }
  
  
      /**
       * <p>Interface definition for a callback to be invoked when the checked
       * radio button changed in this group.</p>
       */
      public interface OnCheckedChangeListener {
          /**
           * <p>Called when the checked radio button has changed. When the
           * selection is cleared, checkedId is View.NO_ID.</p>
           *
           * @param group     the group in which the checked radio button has changed
           * @param checkedId the unique identifier of the newly checked radio button
           */
          public void onCheckedChanged(CheckGroup group, @IdRes int checkedId);
      }
  
      private class CheckedStateTracker implements CompoundButton.OnCheckedChangeListener {
          @Override
          public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
              // prevents from infinite recursion
              if (mProtectFromCheckedChange) {
                  return;
              }
  
              int id = buttonView.getId();
              mProtectFromCheckedChange = true;
              if (mCheckedId != View.NO_ID && mCheckedId != id) {
                  setCheckedStateForView(mCheckedId, false);
              }
              mProtectFromCheckedChange = false;
  
              setCheckedId(isChecked ? id : View.NO_ID);
          }
      }
  
      /**
       * <p>A pass-through listener acts upon the events and dispatches them
       * to another listener. This allows the table layout to set its own internal
       * hierarchy change listener without preventing the user to setup his.</p>
       */
      private class PassThroughHierarchyChangeListener implements
              OnHierarchyChangeListener {
          private OnHierarchyChangeListener mOnHierarchyChangeListener;
  
          /**
           * {@inheritDoc}
           */
          @Override
          public void onChildViewAdded(View parent, View child) {
              if (parent == CheckGroup.this && child instanceof CheckBox) {
                  int id = child.getId();
                  // generates an id if it's missing
                  if (id == View.NO_ID) {
                      id = View.generateViewId();
                      child.setId(id);
                  }
                  ((CheckBox) child).setOnCheckedChangeListener(
                          mChildOnCheckedChangeListener);
              }
  
              if (mOnHierarchyChangeListener != null) {
                  mOnHierarchyChangeListener.onChildViewAdded(parent, child);
              }
          }
  
          /**
           * {@inheritDoc}
           */
          @Override
          public void onChildViewRemoved(View parent, View child) {
              if (parent == CheckGroup.this && child instanceof CheckBox) {
                  ((CheckBox) child).setOnCheckedChangeListener(null);
              }
  
              if (mOnHierarchyChangeListener != null) {
                  mOnHierarchyChangeListener.onChildViewRemoved(parent, child);
              }
          }
      }
  }