安卓：在ListView控件的onClick行更改按钮背景

问题描述

我行包含有自己的点击监听器，我的适配器的getView设置一个按钮。我能采用了android我的按钮点击和实际行项的点击次数来区分：在该行的母公司descendantFocusability =blocksDescendants

My rows contain a button that has its own click listener set in my adapter's getView. I'm able to distinguish between my button clicks and the actual row item clicks using android:descendantFocusability="blocksDescendants" in the row's parent.

当我点击一个按钮，它正确地设置按钮的背景下，我的问题是，我通过列表中的设置它不同行，以及滚动。我认为他们的问题的地方，享有回收。

When I click on a button it sets the button background properly, my problem is as I scroll through the list its setting it for different rows as well. I assume theirs an issue somewhere with views recycling.

下面是我的code：

@Override
public View getView(int position, View convertView, ViewGroup parent){

    if(convertView == null){

        holder = new ViewHolder();

        convertView = inflater.inflate(R.layout.todays_sales_favorite_row, null);
        holder.favCatBtn = (Button)convertView.findViewById(R.id.favCatBtn);

        convertView.setTag(holder);

    } else {
        holder = (ViewHolder)convertView.getTag();
    }

        holder.favCatBtn.setTag(position);
        holder.favCatBtn.setOnClickListener(this);

    return convertView;
 }

@Override
public void onClick(View v) {
    int pos = (Integer) v.getTag();
    Log.d(TAG, "Button row pos click: " + pos);
    RelativeLayout rl = (RelativeLayout)v.getParent();
    holder.favCatBtn = (Button)rl.getChildAt(0);
    holder.favCatBtn.setBackgroundResource(R.drawable.icon_yellow_star_large);

}

所以，如果我在行位置1按钮背景更改，请单击该按钮，因为它应该。但后来当我向下滚动列表随机其他按键越来越设置为好。然后，有时，当我向后滚动到位置1按钮背景又恢复到原来的。

So if i click on the button at row position 1 the button background changes as it should. But then as i scroll down the list random other buttons are getting set as well. Then sometimes when I scroll back up to position 1 the button background reverts back to the original again.

我缺少的是在这里吗？我知道，我就在那里它只是次要的东西我不这样做。

What am I missing here? I know I'm right there its just something minor I'm not doing.

推荐答案

是的，你说得对，意见被回收。您将需要跟踪位置都被点击它并更新你的 getView 法的背景资源。例如，我的扩展code以添加背景的转换：

Yes, you are right, the views are recycled. You will need to track which positions have been clicked on and update the background resource in your getView method. For example, I extended your code to add background toggling:

private final boolean[] mHighlightedPositions = new boolean[NUM_OF_ITEMS];

@Override
public View getView(int position, View convertView, ViewGroup parent){

    if(convertView == null){
        holder = new ViewHolder();
        convertView = inflater.inflate(R.layout.todays_sales_favorite_row, null);
        holder.favCatBtn = (Button)convertView.findViewById(R.id.favCatBtn);
        holder.favCatBtn.setOnClickListener(this);
        convertView.setTag(holder);
    }else {
        holder = (ViewHolder)convertView.getTag();
    }

    holder.favCatBtn.setTag(position);

    if(mHighlightedPositions[position]) {
        holder.favCatBtn.setBackgroundResource(R.drawable.icon_yellow_star_large);
    }else {
        holder.favCatBtn.setBackgroundResource(0);
    }

    return convertView;
}

@Override
public void onClick(View view) {
    int position = (Integer)view.getTag();
    Log.d(TAG, "Button row pos click: " + position);

    // Toggle background resource
    RelativeLayout layout = (RelativeLayout)view.getParent();
    Button button = (Button)layout.getChildAt(0);
    if(mHighlightedPositions[position]) {
        button.setBackgroundResource(0);
        mHighlightedPositions[position] = false;
    }else {
        button.setBackgroundResource(R.drawable.icon_yellow_star_large);
        mHighlightedPositions[position] = true;
    }
}

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