Question

我正在制作一个待办事项列表应用，我使用了listview。每个项目都有一个复选框和一个textview，并拥有自己的Task对象。问题是当我检查一个盒子时，另一个盒子下面10-11行也会被检查。如果您继续在列表中向上和向下滚动，则会选中已选中的复选框，并且很快就会检查所有这些复选框。我不明白我做错了什么。帮助将非常感谢！谢谢！

这是我的ListAdapter：

public class TaskListAdapter extends BaseAdapter {

private ArrayList<Task> tasks;
private Context context;
private TinyDB tinyDB;

public TaskListAdapter(Context context, ArrayList<Task> tasks, TinyDB tinyDB){
    this.context = context;
    this.tasks = tasks;
    this.tinyDB = tinyDB;
}
@Override
public int getCount() {
    return tasks.size();
}

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

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


static class ViewHolder {
    AppCompatCheckBox checkBox;
    TextView taskTextView;
}

@Override
public View getView(final int position, View convertView, ViewGroup parent) {
    ViewHolder holder;
    if (convertView == null) {
        LayoutInflater layoutInflater = LayoutInflater.from(context);
        convertView = layoutInflater.inflate(R.layout.list_item, null);

        holder = new ViewHolder();
        holder.checkBox = (AppCompatCheckBox) convertView.findViewById(R.id.checkBox);
        holder.taskTextView = (TextView) convertView.findViewById(R.id.taskTextView);
        convertView.setTag(holder);
    } else {
        holder = (ViewHolder) convertView.getTag();
    }

    //checkbox
    int priority = tasks.get(position).getPriority();
    int[][] states = new int[][]{new int[]{-android.R.attr.state_checked}, new int[]{android.R.attr.state_checked}};
    int[] redColors = new int[]{context.getResources().getColor(R.color.radioBtnRed), context.getResources().getColor(R.color.radioBtnRed),};
    int[] blueColors = new int[]{context.getResources().getColor(R.color.radioBtnBlue), context.getResources().getColor(R.color.radioBtnBlue),};
    int[] greenColors = new int[]{context.getResources().getColor(R.color.radioBtnGreen), context.getResources().getColor(R.color.radioBtnGreen),};
    if(priority == 1){
        holder.checkBox.setSupportButtonTintList(new ColorStateList(states, redColors));
    }
    else if(priority == 2){
        holder.checkBox.setSupportButtonTintList(new ColorStateList(states, blueColors));
    }
    else if(priority == 3){
        holder.checkBox.setSupportButtonTintList(new ColorStateList(states, greenColors));
    }

    holder.checkBox.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {
        @Override
        public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
            tasks.get(position).setIsChecked(isChecked);
            tinyDB.putListObject(MainActivity.TASKS_FILE, tasks);
            MainActivity.collectCheckedTasks();
        }
    });

    boolean isChecked = tasks.get(position).isChecked();
    if(isChecked){
        holder.checkBox.setChecked(true);
    }

    //task title
    String title = tasks.get(position).getTitle();
    holder.taskTextView.setText(title);

    return convertView;
}

}

Answer 1

您的代码

if(isChecked){
    holder.checkBox.setChecked(true);
}

如果isChecked为真，则将复选框设置为选中状态，但如果isChecked为假，则不执行任何操作。选中的复选框保持选中状态，但应取消选中。

尝试更改为

holder.checkBox.setChecked(isChecked);

Android Listview复选框被扰乱

1 个答案: