Question

我以编程方式创建了linearylayout。它有多行创建有白色背景。现在如果我点击任何一行，那么只应更改该行的imageview图标（应为绿色），其他行的imageview背景应更改为白色。在android中是否有针对linearlayout的notifyDataSetChanged的任何替代。下面是我的代码。

for (int i = 0; i <= obj_tribe_info.al_ethnicity_secondary.size(); i++) {

            final int position = i;

            al_eth_bool.add(false);

            final LinearLayout ll_values = new LinearLayout(_activity);
            ll_values.setOrientation(LinearLayout.HORIZONTAL);
            ll_values.setGravity(Gravity.CENTER_VERTICAL);
            LayoutParams LLParams = new LayoutParams(LayoutParams.WRAP_CONTENT,
                    LayoutParams.WRAP_CONTENT);
            ll_values.setLayoutParams(LLParams);
            ll_values.setBackgroundResource(R.drawable.my_tribe_box_top);

            LinearLayout.LayoutParams layoutParams = new LinearLayout.LayoutParams(
                    LinearLayout.LayoutParams.WRAP_CONTENT,
                    LinearLayout.LayoutParams.WRAP_CONTENT);
            layoutParams.setMargins(50, 0, 0, 0);

            final ImageView iv_icon = new ImageView(_activity);
            if (al_eth_bool.get(position)) {
                iv_icon.setBackgroundResource(R.drawable.notify_onn);
            } else {
                iv_icon.setBackgroundResource(R.drawable.notify_off);
            }
            iv_icon.setLayoutParams(layoutParams);
            ll_values.addView(iv_icon);

            TextView tv_value = new TextView(_activity);
            tv_value.setTextColor(_activity.getResources().getColor(
                    R.color.black));
            tv_value.setLayoutParams(layoutParams);
            if (i == 0) {
                tv_value.setText(obj_tribe_info.str_ethnicity_primary);
            } else {
                tv_value.setText(obj_tribe_info.al_ethnicity_secondary
                        .get(i - 1).str_ethnicity_secondary);
            }
            ll_values.addView(tv_value);

            ll_ethnicity.post(new Runnable() {

                @Override
                public void run() {
                    // TODO Auto-generated method stub
                    ll_ethnicity.addView(ll_values);
                }
            });

            ll_values.setOnClickListener(new OnClickListener() {

                @Override
                public void onClick(View v) {
                    // TODO Auto-generated method stub
                    if (al_eth_bool.get(position)) {
                        iv_icon.setBackgroundResource(R.drawable.notify_off);
                        al_eth_bool.set(position, false);
                    } else {
                        iv_icon.setBackgroundResource(R.drawable.notify_onn);
                        al_eth_bool.set(position, true);
                    }

                }
            });

        }

Answer 1

不，没有notifyDataSetChanged()的替代品，您必须手动通知您的ImageViews该更改。

只要你有变化，你就可以这样迭代：

for(int i= 0; i < ll_ethnicity.getChildCount(); i++){
    ImageView iv = (ImageView) ((ViewGroup)ll_ethnicity.getChildAt(i)).getChildAt(0);
    // new background because something has changed
    // check if it's not the imageView you just clicked because you don't want to change its background
    iv.setBackground(...);
}

为了获得更好的性能，您还可以使用ImageViews创建HashMap，然后根据需要访问它以更改其中一些。

Answer 2

我相信您正在寻找的是View.invalidate()方法。它告诉应用程序该视图不再正确，并且在可能的情况下将重绘它。在onClick方法的末尾调用它。

如何在android中以编程方式更新linearlayout子视图？

2 个答案: