在ListView中使用SeekBar [英] Using a SeekBar within a ListView

问题描述

我在列表视图中有一个搜索栏，它被禁用以阻止用户在滚动列表时更改值.如果列表项被长按，我希望启用它，允许用户更改它，然后再次禁用它.

I have a seekbar in a listview, it is disabled to stop the user from changing the value whilst scrolling the list. I wish to enable it if the list item is long clicked, allow the user to change it and then disable it again.

任何建议.

我似乎无法从活动中访问搜索栏，因为它是在ArrayAdapter中设置的，用于显示数据库中的值

I seem unable to access the seekbar from the activity as it is setup inside the ArrayAdapter to display a value from the database

由于搜索栏当前处于禁用状态，因此我可以触发列表项的click事件和long click事件.

I am able to fire a both a click event and a long click event for the list item, as the seekbar is currently disabled.

推荐答案

解决方案

在ArrayAdapter中，我将enabled和focusable都设置为false，并添加了SeekBar侦听器，将属性设置为false允许我使用列表项onItemClicked侦听器.在onItemCLickListener内部，我检索了搜索栏，将属性设置为true，这意味着它可以向上或向下滑动.调整之后，我随后将其禁用.下面的代码

Solution

In the ArrayAdapter I set both enabled and focusable to false and added the SeekBar listener, setting the attributes to false allowed me to use the list item onItemClicked listener. Inside the onItemCLickListener I retreived the seekbar, set the attributes to true, this meant it could be slid up or down. I then disabled it after the adjustment had been made. code below

此代码位于创建列表项的内部，其中包含搜索栏

this code is inside the creation of the list item, in which the seekbar is housed

    seekBar.setClickable(false);
    seekBar.setFocusable(false);
    seekBar.setEnabled(false);

    /* attach listener */
    attachProgressUpdatedListener(seekBar, positionOfItemInList);

AttachProgressUpdatedListener

此方法将侦听器附加到arrayAdapter类内部的搜索栏

AttachProgressUpdatedListener

this method attaches the listener to the seekbar, inside the arrayAdapter class

private void attachProgressUpdatedListener(SeekBar seekBar,
    final int position) {

seekBar.setOnSeekBarChangeListener(new OnSeekBarChangeListener() {

    public void onStopTrackingTouch(SeekBar seekBar) {
    int progress = seekBar.getProgress();
    int task_id = (Integer) seekBar.getTag();

    TaskHandler taskHandler = new TaskHandler(DBAdapter
        .getDBAdapterInstance(getContext()));

    taskHandler.updateTaskProgress(task_id, progress);

    mList.get(position).setProgress(progress);

    //need to fire an update to the activity
    notifyDataSetChanged();
    seekBar.setEnabled(false);

    }

    public void onStartTrackingTouch(SeekBar seekBar) {
    // empty as onStartTrackingTouch listener not being used in
    // current implementation

    }

    public void onProgressChanged(SeekBar seekBar, int progress,
        boolean fromUser) {
    // empty as onProgressChanged listener not being used in
    // current implementation

    }
});

}

OnItemCLickListener

此片段来自包含列表视图的活动.

OnItemCLickListener

this snipped is from the activity which houses the list view.

taskListView.setOnItemClickListener(new OnItemClickListener() {
    public void onItemClick(AdapterView<?> parent, View view,
        int position, long id) {
    SeekBar sb = (SeekBar) view.findViewById(R.id.seek);
    sb.setFocusable(true);
    sb.setEnabled(true);

    }
});

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