<?xml version="1.0" encoding="utf-8"?>
<CheckBox xmlns:android="http://schemas.android.com/apk/res/android"
 android:id="@+id/cbx"
 android:layout_width="wrap_content"
 android:layout_height="wrap_content"
 android:checked="false" />

CheckBox cbx = (CheckBox) findViewById(R.id.cbx);
cbx.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {
  @Override
  public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
   //do something
  }
});

boolean isChecked= false;
CheckBox cbx = (CheckBox) findViewById(R.id.cbx);
cbx.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {
  @Override
  public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
    if(isChecked){
      //do something
    }else{
      //do something else
    }
  }
});
cbx.setChecked(isChecked);

holder.cbx.setTag(item);
holder.cbx.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {
  @Override
  public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
    Item item =(Item) buttonView.getTag();
    if(isChecked){
      item.setCheckState(true);
      //do something
    }else{
      item.setCheckState(false);
      //do something else
    }
  }
});
cbx.setChecked(item.getCheckState());

private class Adapter extends RecyclerView.Adapter<RecyclerView.ViewHolder>{
  SparseBooleanArray mCheckStates=new SparseBooleanArray();
  @Override
  public RecyclerView.ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
    //...
  }
  @Override
  public void onBindViewHolder(RecyclerView.ViewHolder holder, int position) {
    holder.cbx.setTag(position);
    holder.cbx.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {
      @Override
      public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
        int pos =(int)buttonView.getTag();
        if(isChecked){
          mCheckStates.put(pos,true);
          //do something
        }else{
          mCheckStates.delete(pos);
          //do something else
        }
      }
    });
    cbx.setChecked(mCheckStates.get(position,false));
  }
  @Override
  public int getItemCount() {
    //...
  }
}

mCheckStates.put(pos,true);
adapter.notifyDatasetChanged();

ArrayList<Item> selItems=new ArrayList<>();
for(int i=0;i < mCheckStates.size();i++){
  if(mCheckStates.valueAt(i)){
    selItems.add(allItems.get(mCheckStates.keyAt(i)));
  }
}

holder.cbx.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {
  @Override
  public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
    buttonView.setChecked(!isChecked);
    //...
  }
});

boolean lockState=false;
holder.cbx.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {
  @Override
  public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
   if(lockState)return;
   //不然cbx改变状态.
   lockState=true;
    buttonView.setChecked(!isChecked);
    lockState=false;
    //...
  }
});

@Override
public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
 int pos =(int)buttonView.getTag();
  if(isChecked){
 mCheckStates.put(pos,true);
   //do something
 }else{
   mCheckStates.delete(pos);
   //do something else
 }
}

@Override
public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
  if(lockState)return;
  int pos =(int)buttonView.getTag();
  if(mCheckStates.get(pos,false) == isChecked)return;
  if(isChecked){
   mCheckStates.put(pos,true);
   //do something
  }else{
   mCheckStates.delete(pos);
   //do something else
  }
}

public class MainActivity extends AppCompatActivity {

  String[] filter_type_strs = {"音乐", "书籍", "电影"};
  CheckBox cbx;
  private boolean lockState=false;
  int current_filter_type=0;
  @Override
  protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    cbx = (CheckBox) findViewById(R.id.cbx);

    cbx.setText(filter_type_strs[current_filter_type]);
    cbx.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {
      @Override
      public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
        if (lockState) return;
        try {
          if (isChecked) {
            //此处传入了cbx做参数
            PopupWindow pw = new FilterLinePw(buttonView.getContext(), cbx, filter_type_strs);
            pw.showAsDropDown(cbx);
          } else {
            //此处的buttonView就是cbx
            Integer pos = (Integer) buttonView.getTag();
            if (pos == null || pos == -1) return;
            current_filter_type = pos;

            Toast.makeText(MainActivity.this, "搜索"+filter_type_strs[current_filter_type], Toast.LENGTH_SHORT).show();
          }
        } catch (NullPointerException e) {
          //以防万一
          lockState = true;
          buttonView.setChecked(!isChecked);
          lockState = false;
        }
      }
    });

  }
}

public class FilterLinePw extends PopupWindow {
  RadioGroup radioGroup;
  CheckBox outCbx;

  //为动态生成radioButton生成id
  int[] rbtIds = {0, 1, 2};

  public FilterLinePw(Context context, CheckBox outCbx, String[] items) {
    super(ViewGroup.LayoutParams.MATCH_PARENT, ViewGroup.LayoutParams.MATCH_PARENT);
    View contentview = LayoutInflater.from(context).inflate(R.layout.filter_line_popupwindow, null);
    setContentView(contentview);
    setFocusable(true);
    setOutsideTouchable(true);
    this.outCbx = outCbx;
    contentview.setOnKeyListener(new View.OnKeyListener() {
      @Override
      public boolean onKey(View v, int keyCode, KeyEvent event) {
        if (keyCode == KeyEvent.KEYCODE_BACK) {
          dismiss();
          return true;
        }
        return false;
      }
    });
    contentview.setFocusable(true); // 这个很重要
    contentview.setFocusableInTouchMode(true);
    contentview.setOnClickListener(new View.OnClickListener() {
      @Override
      public void onClick(View v) {
        dismiss();
      }
    });

    init(context, contentview,items);

  }

  private void init(Context context, View contentview, String[] items) {
    /**
     * 用传入的筛选条件初始化UI
     */
    radioGroup = (RadioGroup) contentview.findViewById(R.id.filter_layout);
    radioGroup.clearCheck();
    if (items == null) return;
    for (int i = 0; i < items.length; i++) {

      RadioButton radioButton = (RadioButton) LayoutInflater.from(context).inflate(R.layout.line_popupwindow_rbt, null);
      radioButton.setId(rbtIds[i]);
      radioButton.setText(items[i]);

      radioGroup.addView(radioButton, -1, radioGroup.getLayoutParams());

      if (items[i].equals(outCbx.getText())) {
        outCbx.setTag(i);
        radioButton.setChecked(true);
      }

    }
    radioGroup.setOnCheckedChangeListener(new RadioGroup.OnCheckedChangeListener() {
      @Override
      public void onCheckedChanged(RadioGroup group, int checkedId) {
        dismiss();
      }
    });
  }

  //重点内容,重写dismiss();
  @Override
  public void dismiss() {
    if (outCbx != null && outCbx.isChecked()) {
      int id = radioGroup.getCheckedRadioButtonId();
      RadioButton rbt = (RadioButton) radioGroup.findViewById(id);
      Integer old_tag = (Integer) outCbx.getTag();
      if (old_tag == null) {
        super.dismiss();
        return;
      }
      if (old_tag != id) {
        outCbx.setTag(id);
        outCbx.setText(rbt.getText());
      } else {
        outCbx.setTag(-1);
      }
      //下面执行之后,会执行MainActivity中的onCheckedChanged里的否定分支
      outCbx.setChecked(false);
    }
    super.dismiss();
  }
}

public class FrameLayoutCheckBox extends FrameLayout {
  CompoundButton cbx;

  public FrameLayoutCheckBox(Context context) {
    super(context);
  }

  public FrameLayoutCheckBox(Context context, AttributeSet attrs) {
    super(context, attrs);
  }

  public FrameLayoutCheckBox(Context context, AttributeSet attrs, int defStyleAttr) {
    super(context, attrs, defStyleAttr);
  }

  private CheckBox findCheckBox(View view) {
    //无递归广度优先遍历寻找CheckBox - -!我只是想重温一下C
    ArrayList<View> views = new ArrayList<>();
    views.add(view);
    while (!views.isEmpty()) {
      View c = views.remove(0);
      if (c instanceof CheckBox) {
        return (CheckBox) c;
      } else if (c instanceof ViewGroup) {
        ViewGroup fa = (ViewGroup) c;
        for (int i = 0; i < fa.getChildCount(); i++) {
          views.add(fa.getChildAt(i));
        }
      }
    }
    return null;
  }

  @Override
  protected void onFinishInflate() {
    super.onFinishInflate();
    if (getChildCount() > 0) {
      View child = findCheckBox(this);
      if (child instanceof CompoundButton) cbx = (CompoundButton) child;
    }
  }

  @Override
  protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
    super.onMeasure(widthMeasureSpec, heightMeasureSpec);
    if (cbx != null) {
      Rect bounds = new Rect(getPaddingLeft(), getPaddingTop(), getPaddingLeft() + getMeasuredWidth() + getPaddingRight(), getPaddingTop() + getMeasuredHeight() + getPaddingBottom());
      TouchDelegate delegate = new TouchDelegate(bounds, cbx);
      setTouchDelegate(delegate);
    }
  }
}