大二寒假作业之账本开发

今日完成了账本的listView以及对应的Adapter类用于填充列表视图。

列表视图一个单元有图片用于直观的显示收入或支出，以及三个文本框分别为账目标题，金额与日期。

并完成了MainActivity中的载入今日，当月以及本年的账目，长按ListView中的账目删除的函数。下面为代码：

public class CAcctItemAdapter extends BaseAdapter {
    private List<Map<String,Object>> myList;
    private LayoutInflater myInflater;//布局服务
    public CAcctItemAdapter(Context context,List<Map<String,Object>> lst){
        myList=lst;
        myInflater=LayoutInflater.from(context);
    }
    @Override
    public boolean areAllItemsEnabled(){
        return true;
    }//条目是否可点击
    @Override
    public boolean isEnabled(int i){
        return true;
    }
    @Override
    public void registerDataSetObserver(DataSetObserver dataSetObserver){//数据改变时监听器
    }

    @Override
    public void unregisterDataSetObserver(DataSetObserver observer) {//解除监听器
    }
    @Override
    public int getCount() {//要绑定的数目
        if(myList==null)return 0;
        else return myList.size();
    }

    @Override
    public Object getItem(int position) {//根据索引获取对象
        if(myList==null) return null;
        else return myList.get(position);
    }

    @Override
    public long getItemId(int position) {//获取条目id
        if(myList==null) return -1L;
        else return (long)myList.get(position).get("acctId");
    }

    @Override
    public boolean hasStableIds() {//起到局部刷新的优化效果
        return true;
    }

    @Override
    public View getView(int position, View convertView, ViewGroup parent) {//获取显示界面
        if(convertView==null){
            convertView=myInflater.inflate(R.layout.layout,null);//读取布局文件
        }
        TextView txtTitle=convertView.findViewById(R.id.txtTitle);
        txtTitle.setText((String)(myList.get(position).get("acctTitle")));
        TextView txtAmount=convertView.findViewById(R.id.txtAmount);
        txtAmount.setText(String.format("%.2f",myList.get(position).get("acctAmount")));
        TextView textDate=convertView.findViewById(R.id.txtDate);
        textDate.setText(String.format("%d-%d-%d"
                ,myList.get(position).get("acctYear")
                ,myList.get(position).get("acctMonth")
                ,myList.get(position).get("acctDay")));
        ImageView imgType=convertView.findViewById(R.id.imgType);
        long type=(long)(myList.get(position).get("acctType"));
        if(type==1){
            imgType.setImageResource(R.drawable.type_1);
        }else{
            imgType.setImageResource(R.drawable.type_2);
        }
        return convertView;
    }

    @Override
    public int getItemViewType(int position) {//获取视图类型
        return R.layout.layout;
    }

    @Override
    public int getViewTypeCount() {//返回视图创建的数量
        return 1;
    }

    @Override
    public boolean isEmpty() {//数据是否为空
        return false;
    }

    @Override
    public CharSequence[] getAutofillOptions() {
        return new CharSequence[0];
    }
}

    //载入今天账目
    private void loadToday(){
        CAccount acct=CAccount.getInstance(this,1);
        myData=acct.queryByDay(System.currentTimeMillis());
        adapter=new CAcctItemAdapter(this,myData);
        lstAcct.setAdapter(adapter);
    }
    //载入本月账目
    private void loadThisMonth(){
        CAccount acct=CAccount.getInstance(this,1);
        myData=acct.queryByMonth(System.currentTimeMillis());
        adapter=new CAcctItemAdapter(this,myData);
        lstAcct.setAdapter(adapter);
    }
    //载入本年账目
    private void loadThisYear(){
        CAccount acct=CAccount.getInstance(this,1);
        myData=acct.queryByYear(System.currentTimeMillis());
        adapter=new CAcctItemAdapter(this,myData);
        lstAcct.setAdapter(adapter);
    }
    //长安删除账目
    @Override
    public boolean onItemLongClick(AdapterView<?> adapterView, View view, int i, long l) {
        final int acctid=(int) l;
        if(acctid>0){
            AlertDialog.Builder dlg=new AlertDialog.Builder(MainActivity.this);
            dlg.setTitle("迷你账本").setMessage("请问确定要删除吗？").setCancelable(false);
            dlg.setPositiveButton("确定", new DialogInterface.OnClickListener() {
                @Override
                public void onClick(DialogInterface dialog, int which) {
                    CAccount acct=CAccount.getInstance(MainActivity.this,1);
                    acct.delete(acctid);
                    myData.remove(i);
                    lstAcct.setAdapter(adapter);
                }
            });
            dlg.setNegativeButton("取消", new DialogInterface.OnClickListener() {
                @Override
                public void onClick(DialogInterface dialog, int which) {
                }
            });
            dlg.show();
        }
        return false;
    }