如何通过单击 android 中的按钮重新加载 listView？

Question

I have created a view in which i have 1 list view and 2 buttons. The first button is for deleting the selected list view and the 2nd button is for deleting the deleted the entire data from the table. I want that if I delete the entire data from the table the list view should get refreshed an it should get reloaded. Please help me out in achieving this.Thanks in advance.

Answer 1

use should use notifyDataSetChanged () method to refresh your listview...

Call notifyDataSetChanged() on your Adapter

see this link........ http://developer.android.com/reference/android/widget/BaseAdapter.html#notifyDataSetChanged%28%29

Answer 2

you can follow the following way

1) create a handler to add or remove item to your listview

static final int UPDATE_LIST =1;
static final int CLEAR_LIST = 2;

    private Handler photoGridHandler = new Handler() {
        @Override
        public void handleMessage(Message msg) {
            switch (msg.what) {
            case UPDATE_LIST:

                int index = msg.arg1;

                Bitmap bitMapImage = (Bitmap) msg.obj;
                mylist.add(bitMapImage);
myAdapter.notifyDataSetChanged();
                break;

            case CLEAR_LIST:
                                 int index = msg.arg1;
                mylist.remove(index );
                myAdapter.notifyDataSetChanged();
break;

            }
        };
    };

2) call this handler for different type of operation either you want to add data or remove data from the list. So handler should be called inside your onClickListener() . See the below how to call handler

        to remove element from the list use the following

Message msg = new Message();
        msg.what = CLEAR_LIST;
        msg.arg1 = index;

        photoGridHandler.sendMessage(msg);

to add elements to the list use the folowing

Message msg = new Message();
        msg.what = UPDATE_LIST;
        msg.arg1 = index;
        msg.obj = image;
        photoGridHandler.sendMessage(msg);

Thanks Deepak