Question

这是我的baseadapter的代码，它显示了联系人＆＃39;姓名，电话号码和旁边的复选框。

class MyAdapter extends BaseAdapter implements CompoundButton.OnCheckedChangeListener
{   public SparseBooleanArray mCheckStates;
    LayoutInflater mInflater;
    TextView tv1,tv;
    CheckBox cb;
    int mPos;
    MyAdapter()
    {
        if (mCheckStates==null){
        mCheckStates = new SparseBooleanArray(name1.size());
        }else {
        mCheckStates = (SparseBooleanArray) bundle.getParcelable("myBooleanArray");

        }
        mInflater = (LayoutInflater) ContactActivity.this.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
    }
    @Override
    public int getCount() {
        // TODO Auto-generated method stub
        return name1.size();
    }

    public void setPosition(int p){
        mPos = p;
    }

    public int getPosition(){
        return mPos;
    }


    @Override
    public Object getItem(int position) {
        // TODO Auto-generated method stub
        return position;
    }

    @Override
    public long getItemId(int position) {
        // TODO Auto-generated method stub

        return 0;
    }

    @Override
    public View getView(final int position, View convertView, ViewGroup parent) {
        // TODO Auto-generated method stub
        View vi=convertView;
        if(convertView==null)
        vi = mInflater.inflate(R.layout.row, null);
        tv= (TextView) vi.findViewById(R.id.textView1);
        tv1= (TextView) vi.findViewById(R.id.textView2);
        cb = (CheckBox) vi.findViewById(R.id.checkBox1);
        tv.setText("Name :"+ name1.get(position));
        tv1.setText("Phone No :"+ phno1.get(position));
        cb.setTag(position);
        cb.setChecked(mCheckStates.get(position, false));
        setPosition(position);
        cb.setOnCheckedChangeListener(this);

        return vi;
    }
    public boolean isChecked(int position) {
        return mCheckStates.get(position, false);
    }

    public void setChecked(int position, boolean isChecked) {
        mCheckStates.put(position, isChecked);
    }

    public void toggle(int position) {
        setChecked(position, !isChecked(position));
    }
    @Override
    public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
        mCheckStates.put((Integer) buttonView.getTag(), isChecked);
    }
}

活动代码：

@Override
public void onDestroy(){
    bundle.putParcelable("myBooleanArray", new SparseBooleanArrayParcelable(adapter.mCheckStates)); 
    //adapter is the MyAdapter object created in parent class
    super.onDestroy();
}

请注意，我使用bundle.putParcelable("myBooleanArray", new SparseBooleanArrayParcelable(adapter.mCheckStates));和mCheckStates = (SparseBooleanArray) bundle.getParcelable("myBooleanArray");来存储和检索正在销毁和重新创建的活动的SparseBooleanArray。 onDestroy（）方法是父类，它是一个活动。我没有粘贴，因为我认为这是无关紧要的。请询问是否需要。

我还使用SparseBooleanArrayParcelable类来帮助我mCheckStates进行销毁，并在创建时进行检索。

根据日志，尝试执行bundle.putParcelable("myBooleanArray", new SparseBooleanArrayParcelable(adapter.mCheckStates));时，onDestroy（）内发生NullPointerException

帮助将不胜感激。谢谢！

编辑：我初步化了bundle错误。现在我没有遇到任何错误，但是没有保存复选框状态。我可以用一些帮助。谢谢！

尝试保存SparceBooleanArray时出现NullPointerException

0 个答案: