Question

我有一个按钮，当我点击它时，我想删除arraylist第一个索引的值，是的，删除了数组列表中的第一个索引。但我的列表视图中来自我的arraylist的数据不会被删除 我到目前为止

public ArrayList<String> imagesFileName = new ArrayList<String>();

 mylist = new ArrayList<HashMap<String, String>>();
            for (int i = 0; i < imagesFileName.size(); i++) {
            HashMap<String, String> map = new HashMap<String, String>();
            map.put(FILE_NAME, filename[i]);
            map.put(DESCRIPTION, "desc");
            map.put(UPLOADEDBY, "uploadby");
            map.put(DATE_UPLOAD, "date_upload");
            map.put(ACTION, "delete");
            map.put(ID, String.valueOf(i));
            mylist.add(map);
    }


     adapter = new CustomArrayAdapter(getApplicationContext(), mylist, R.layout.attribute_ireport_list, 
             new String[]{FILE_NAME, DESCRIPTION, UPLOADEDBY, DATE_UPLOAD, ACTION, ID},
             new int[]{R.id.tv_File, R.id.txt_Desc, R.id.tv_UploadedBy, R.id.tv_DateUploaded, R.id.tv_Action, R.id.txt_id}, true);

        lv_iReport.setAdapter(adapter);
    //code for delete of first index
    btn_Upload = (Button) findViewById(R.id.button1);
    btn_Upload.setOnClickListener(new OnClickListener() {

        @Override
        public void onClick(View arg0) {
            // TODO Auto-generated method stub
            imagesFileName.remove(0);
            adapter = new CustomArrayAdapter(getApplicationContext(), mylist, R.layout.attribute_ireport_list, 
                     new String[]{FILE_NAME, DESCRIPTION, UPLOADEDBY, DATE_UPLOAD, ACTION, ID},
                     new int[]{R.id.tv_File, R.id.txt_Desc, R.id.tv_UploadedBy, R.id.tv_DateUploaded, R.id.tv_Action, R.id.txt_id}, true);

                lv_iReport.setAdapter(adapter);

            Toast.makeText(getApplicationContext(), "Deleted", Toast.LENGTH_LONG).show();
        }
    });

Answer 1

试试这个：

 btn_Upload.setOnClickListener(new OnClickListener() {

    @Override
    public void onClick(View arg0) {
        // TODO Auto-generated method stub
        mylist.remove(0);
        adapter.notifyDataSetInvalidated();       
    }
});

Answer 2

只需使用：

myList.remove(object);
notifyDataSetChanged();

如何删除列表视图中的数据，其数据来自android中的数组列表

2 个答案: