Android：选中一个CheckBox会检查同一行中的所有CheckBox

时间：2018-10-01 18:21:20

标签： java android listview checkbox

我的应用显示了一个ListView，每个CheckBoxes的{​​{1}}的数量不同。连续row的最大数量为三。我的应用程序如下所示：

enter image description here

  1. 如果左侧的CheckBoxes被选中，则右侧的所有CheckBox应该被自动选中。
  2. 如果未选中右侧的CheckBoxes，则左侧的所有CheckBox都将自动处于未选中状态。

我在这里举一个例子：
第一行中有三个CheckBoxes。 CheckBoxes (cb1, cb2 and cb3)位于左侧，cb1位于中间，cb2位于右侧。

  1. 当前所有cb3都未选中。用户检查左一个（CheckBoxes）。所有其他cb1都会被自动检查。
  2. 当前已检查所有CheckBoxes (cb2 and cb3)。用户取消选中右边的（CheckBoxes）。 所有其他cb3都会自动取消锁定。

我尝试用CheckBoxes (cb1 and cb2)解决我的问题，但出现以下消息

  

“变量'Holder'是从内部类内部访问的，需要   被宣布为最终裁决。”

我的问题：

  1. 如何解决此问题，以便不会出现消息？

  2. 我的解决方案在逻辑上正确吗？

如果我的问题不清楚，请发表评论。

我的解决方案： 

OnCheckedChangeListener

自定义适配器： 

 holder.cb1.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {
                 @Override
                 public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
                     buttonView.setChecked(isChecked);
                     //Case1: Left (cb1) gets checked -> set all other right CB´s (cb2 & cb3) checked
                     if(isChecked){
                         holder.cb2.setChecked(isChecked);  //Error Message occurs here
                         holder.cb3.setChecked(isChecked);  //Error Message occurs here
                     }
                   }
               });

            holder.cb2.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {
                @Override
                public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
                    buttonView.setChecked(isChecked);
                    //Case2: Middle (cb2) gets checked -> set right CB (cb3) checked
                    if(isChecked){
                        holder.cb3.setChecked(isChecked);   //Error Message occurs here
                    }
                    //Case3: Middle (cb2) gets unchecked -> set left CB (cb1) unchecked
                    else {
                        holder.cb1.setChecked(isChecked);   //Error Message occurs here
                    }
                  }
              });

            holder.cb3.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {
                @Override
                public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
                    buttonView.setChecked(isChecked);
                    //Case4: Right (cb3) gets unchecked -> set all other left CB´s (cb1 & cb 2) unchecked
                    if(!isChecked){
                        holder.cb2.setChecked(isChecked);   //Error Message occurs here
                        holder.cb1.setChecked(isChecked);   //Error Message occurs here
                    }
                  }
              });

行布局： 

public class ItemListAdapter extends BaseAdapter {

private LayoutInflater inflater;
private ArrayList<Object> itemArray;
int resIdImage;
private static final int TYPE_ListElement = 0;
private static final int TYPE_DIVIDER = 1;

public ItemListAdapter(Context context, ArrayList<Object> itemArray, int resource) {
    this.itemArray = itemArray;
    this.resIdImage = resource;
    this.inflater = (LayoutInflater)context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
}

@Override
public int getCount() {
    return itemArray.size();
}

@Override
public long getItemId(int position) {
    return position;
}

@Override
public Object getItem(int position) {
    return itemArray.get(position);
}

@Override
public int getViewTypeCount() {
    // TYPE_PERSON and TYPE_DIVIDER
    return 2;
}

@Override
public int getItemViewType(int position) {
    if (getItem(position) instanceof ItemList) {
        return TYPE_ListElement;
    }

    return TYPE_DIVIDER;
}

@Override
public boolean isEnabled(int position) {
    return (getItemViewType(position) == TYPE_ListElement);
}

public class DataHolder{
    ImageView imageView;
    TextView textView;
    CheckBox cb1;
    CheckBox cb2;
    CheckBox cb3;
}
@Override
public View getView(int position, View convertView, ViewGroup parent) {

    DataHolder holder =  null;
    int type = getItemViewType(position);
    if (convertView == null) {
        switch (type) {
            case TYPE_ListElement:
                convertView = inflater.inflate(resIdImage, parent, false);
                holder = new DataHolder();
                holder.imageView = (ImageView) convertView.findViewById(R.id.image);
                holder.textView = (TextView) convertView.findViewById(R.id.nameLabel);
                holder.cb1 = (CheckBox) convertView.findViewById(R.id.checkbox);
                holder.cb2 = (CheckBox) convertView.findViewById(R.id.checkbox2);
                holder.cb3 = (CheckBox) convertView.findViewById(R.id.checkbox3);
                convertView.setTag(holder);
                break;
            case TYPE_DIVIDER:
                convertView = inflater.inflate(R.layout.row_header, parent, false);
                break;
        }
    }
    else {
        holder = (DataHolder)convertView.getTag();
    }

    switch (type) {
        case TYPE_ListElement:
            ItemList item = (ItemList) getItem(position);
            holder.textView.setText(item.getTitle());
            holder.imageView.setImageResource(item.resIdImage);

            int numCheckBox = item.numCheckBox;
            if(numCheckBox == 1){
               holder.cb1.setVisibility(View.VISIBLE);
               holder.cb2.setVisibility(View.GONE);
               holder.cb3.setVisibility(View.GONE);
            } else if (numCheckBox == 2){
               holder.cb1.setVisibility(View.VISIBLE);
               holder.cb2.setVisibility(View.VISIBLE);
               holder.cb3.setVisibility(View.GONE);
            } else if (numCheckBox == 3){
               holder.cb1.setVisibility(View.VISIBLE);
               holder.cb2.setVisibility(View.VISIBLE);
               holder.cb3.setVisibility(View.VISIBLE);
            }
             holder.cb1.setChecked(item.checked);
             holder.cb2.setChecked(item.checked);
             holder.cb3.setChecked(item.checked);

             holder.cb1.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {
                 @Override
                 public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
                     buttonView.setChecked(isChecked);
                     //Case1: Left (cb1) gets checked -> set all other right CB´s (cb2 & cb3) checked
                     if(isChecked){
                         holder.cb2.setChecked(isChecked);  //Error Message occurs here
                         holder.cb3.setChecked(isChecked);  //Error Message occurs here
                     }
                 }
             });

            holder.cb2.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {
                @Override
                public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
                    buttonView.setChecked(isChecked);
                    //Case2: Middle (cb2) gets checked -> set right CB (cb3) checked
                    if(isChecked){
                        holder.cb3.setChecked(isChecked);   //Error Message occurs here
                    }
                    //Case3: Middle (cb2) gets unchecked -> set left CB (cb1) unchecked
                    else {
                        holder.cb1.setChecked(isChecked);   //Error Message occurs here
                    }
                }
            });

            holder.cb3.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {
                @Override
                public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
                    buttonView.setChecked(isChecked);
                    //Case4: Right (cb3) gets unchecked -> set all other left CB´s (cb1 & cb 2) unchecked
                    if(!isChecked){
                        holder.cb2.setChecked(isChecked);   //Error Message occurs here
                        holder.cb1.setChecked(isChecked);   //Error Message occurs here
                    }
                }
            });

             break;

        case TYPE_DIVIDER:
            TextView title = (TextView)convertView.findViewById(R.id.headerTitle);
            String titleString = (String)getItem(position);
            title.setText(titleString);
            break;
    }


    return convertView;
}
}

1 个答案:

答案 0 :(得分：1)

创建一个引用您final的{​​{1}}变量，并在onCheckedChangeListener中使用它：

ViewHolder
  

对cb3 final DataHolder finalHolder = holder; holder.cb1.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() { @Override public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) { buttonView.setChecked(isChecked); //Case1: Left (cb1) gets checked -> set all other right CB´s (cb2 & cb3) checked if(isChecked){ finalHolder.cb2.setChecked(isChecked); // NO MORE ERROR finalHolder.cb3.setChecked(isChecked); //NO MORE ERROR } } }); holder.cb2.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() { @Override public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) { buttonView.setChecked(isChecked); //Case2: Middle (cb2) gets checked -> set right CB (cb3) checked if(isChecked){ finalHolder.cb3.setChecked(isChecked); // NO MORE ERROR } //Case3: Middle (cb2) gets unchecked -> set left CB (cb1) unchecked else { finalHolder.cb1.setChecked(isChecked); //NO MORE ERROR } } }); 也执行相同操作。

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