如何更改列表视图中每一行的背景颜色? [英] How to change background color of each row in list view?

问题描述

我的应用程序包含 1 个列表视图，数据源是 1 个 sqlite 表，当我长按列表视图中的任何行时，它将显示 1 个菜单选项来更改该行的颜色，为此我使用了 onContextItemSelected 函数，在选择菜单选项时，它将调用 1 个函数 change_color.我应该在 change_color 函数中写什么，以便我可以更改行背景颜色.

My app contains 1 list view, data source is 1 sqlite table, when i hold long click on any row in listview it will show me 1 menu option to change the color of that row, for this i have used onContextItemSelected function, on selecting menu option it will call 1 function change_color. What should i write in change_color function so that i can change row bg color.

    public void onCreateContextMenu(ContextMenu menu, View v,
            ContextMenuInfo menuInfo) {
        super.onCreateContextMenu(menu, v, menuInfo);
        menu.add(0, PROCESSED_ID, 0, R.string.menu_processed);
    }



    public boolean onContextItemSelected(MenuItem item) {
        switch (item.getItemId()) {
        case PROCESSED_ID:
            AdapterContextMenuInfo info = (AdapterContextMenuInfo) item
                    .getMenuInfo();

            change_color();
            return true;
        }
        return super.onContextItemSelected(item);
    }

推荐答案

Call your method as :

change_color(pass_your_list_view, pass_selected_position_of_list_view);

并将 change_color() 定义为:

And define change_color() as:

private void change_color(ListView listView, int position) {
    listView.getChildAt(position).setBackgroundColor(Color.BLACK);
}

希望这会有所帮助.

已编辑

定义一个变量一个位置

public static int position;

并将您的代码替换为

public void onCreateContextMenu(ContextMenu menu, View v,
        ContextMenuInfo menuInfo) {
    super.onCreateContextMenu(menu, v, menuInfo);
    menu.add(0, PROCESSED_ID, 0, R.string.menu_processed);

    // Get the info on which item was selected
    AdapterContextMenuInfo info = (AdapterContextMenuInfo) menuInfo;
    // Retrieve the position at where you long pressed
    position = info.position;

}



public boolean onContextItemSelected(MenuItem item) {
    switch (item.getItemId()) {
    case PROCESSED_ID:
        AdapterContextMenuInfo info = (AdapterContextMenuInfo) item
                .getMenuInfo();

        change_color(getListView(), position);
        return true;
    }
    return super.onContextItemSelected(item);
}

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