这两天用到了ListView,写下遇到的一些问题。首先是ListView本身与子控件的焦点问题，比如我这里子控件用到了Button，在需要ListView中的根布局属性上加上下面的这一个属性：
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android:descendantFocusability="blocksDescendants"
用于屏蔽子控件抢夺ListView的焦点,也可在Button本身设置焦点属性为false。其它的一些控件的点击问题就不说了，网上有很多。
然后是需要点击Button进行网络操作，返回正确结果后设置Button的test为"XXX"，我这里不需要设置其它控件状态改变了，处理方法除了下面我的方法外，也可以用selector。此外还需要保存每个item的position位置用来保存Button的状态（应该这么说：记录此Item（position）上Button的状态，因为是在getView方法里去判断Button状态来设置的，所以叫记录比较好吧），这个问题需要细心的处理，不然就会出现只点击第一个Button后，后面position的Button也被设置成了“XXX”，还有Button的设置的setClickable也会有问题。
好吧，不说了，下面是写的代码， 代码里我应该写的挺清楚的了。这里只是ListView的布局，还有Adapter的代码。要用的话自己在一个Activity的布局里加上个ListView控件，再在代码里设置listview的adapter就可以用了。
ListView的布局
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<?xml version="1.0" encoding="utf-8"?>
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<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
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android:layout_width="match_parent"
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android:layout_height="match_parent"
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android:descendantFocusability="blocksDescendants"
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android:orientation="horizontal" >
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<LinearLayout
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android:layout_width="0dp"
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android:layout_height="match_parent"
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android:layout_weight="1"
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android:gravity="center"
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android:orientation="vertical" >
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<TextView
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android:id="@+id/txt_pre_entry_class"
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android:layout_width="match_parent"
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android:layout_height="wrap_content"
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android:singleLine="true"
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android:text="test" />
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</LinearLayout>
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<LinearLayout
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android:layout_width="0dp"
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android:layout_height="match_parent"
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android:layout_weight="2"
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android:gravity="center"
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android:orientation="vertical" >
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<TextView
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android:id="@+id/txt_pre_entry_teacher"
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android:layout_width="wrap_content"
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android:layout_height="wrap_content"
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android:singleLine="true"
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android:text="Txt1" />
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<TextView
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android:id="@+id/txt_pre_entry_course"
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android:layout_width="wrap_content"
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android:layout_height="wrap_content"
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android:singleLine="true"
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android:text="Txt2" />
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<TextView
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android:id="@+id/txt_pre_entry_class_name"
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android:layout_width="wrap_content"
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android:layout_height="wrap_content"
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android:singleLine="true"
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android:text="Txt3" />
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</LinearLayout>
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<LinearLayout
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android:layout_width="0dp"
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android:layout_height="match_parent"
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android:layout_weight="1"
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android:gravity="center"
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android:orientation="vertical" >
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<Button
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android:id="@+id/btn_pre_entry_order"
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android:layout_width="wrap_content"
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android:layout_height="wrap_content"
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android:singleLine="true"
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android:background="@drawable/button_rounded"
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android:text="未预约"
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/>
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</LinearLayout>
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</LinearLayout>
ListView的Adapter
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public class PreEntryAdapter extends BaseAdapter
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{
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private LayoutInflater inflater;
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private Context context;
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private Dialog orderDialog;
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private String summitUrl;
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private Handler orderHandler;
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private viewHolder holder;
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OrderAsyncTask orderAsyncTask;
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List<List> listSize, listList;
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TextView txtClass, teacherName, className, courseName;
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private int currentPosition = 0;
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private Button currentBtn;
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private boolean[] ORDER_SUCCESS;
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private String[] classes;
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public PreEntryAdapter(Context context, List<List> listSize, List<List> listList)
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{
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this.context = context;
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this.listSize = listSize;
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this.listList = listList;
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ORDER_SUCCESS = new boolean[30];
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classes = new String[30];
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for (int i = 0; i < 30; i++)
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{
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classes[i] = "教2-" + i;
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}
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initView();
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}
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private void initView()
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{
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inflater = LayoutInflater.from(context);
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orderDialog = new Dialog(context);
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View view = inflater.inflate(R.layout.dialog_evaluate_order_preentry, null);
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orderDialog.setContentView(view);
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orderDialog.setCancelable(false);
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orderDialog.setTitle("提交");
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}
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@Override
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public int getCount()
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{
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return 30;
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}
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@Override
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public Object getItem(int position)
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{
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return position;
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}
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@Override
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public long getItemId(int position)
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{
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return position;
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}
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@Override
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public View getView(final int position, View convertView, ViewGroup parent)
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{
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Log.v("log", "--->getView()-" + position);
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if (convertView == null)
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{
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holder = new viewHolder();
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convertView = inflater.inflate(R.layout.adapter_preentry, null);
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holder.btn_order = (Button) convertView.findViewById(R.id.btn_pre_entry_order);
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holder.txt_class = (TextView) convertView.findViewById(R.id.txt_pre_entry_class);
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holder.txt_class_name = (TextView) convertView.findViewById(R.id.txt_pre_entry_class_name);
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holder.txt_course = (TextView) convertView.findViewById(R.id.txt_pre_entry_course);
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holder.txt_teacher = (TextView) convertView.findViewById(R.id.txt_pre_entry_teacher);
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convertView.setTag(holder);
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}
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else
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{
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holder = (viewHolder) convertView.getTag();
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}
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Log.v("log", "-->getView()--ORDER_SUCCESS[" + position + "]-" + ORDER_SUCCESS[position]);
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if (ORDER_SUCCESS[position])
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{
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holder.btn_order.setText("已预约");
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holder.btn_order.setClickable(false);
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}
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else
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{
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holder.btn_order.setText("未预约");
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holder.btn_order.setClickable(true);
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holder.btn_order.setOnClickListener(new btnListener(position, holder.btn_order));
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}
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holder.txt_class.setText(classes[position]);
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return convertView;
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}
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class btnListener implements OnClickListener
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{
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private int position;
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private Button Btn;
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public btnListener(int position, Button currentBtn)
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{
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this.position = position;
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this.Btn = currentBtn;
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}
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@Override
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public void onClick(View v)
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{
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currentPosition = position;
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currentBtn = Btn;
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Toast.makeText(context, "点击第 " + (position + 1) + "个Button", 0).show();
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orderAsyncTask = new OrderAsyncTask();
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orderAsyncTask.execute("");
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orderDialog.show();
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}
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}
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private static class viewHolder
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{
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private Button btn_order;
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private Button btn_temp;
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private TextView txt_class, txt_teacher, txt_course, txt_class_name;
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}
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private class OrderAsyncTask extends AsyncTask<String, Integer, Integer>
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{
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@Override
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protected void onPreExecute()
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{
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super.onPreExecute();
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}
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@Override
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protected Integer doInBackground(String... nullNow)
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{
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Log.v("log", "-->doInBackground()--params-" + nullNow[0]);
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try
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{
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Thread.sleep(2500);
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return SubmitHandler.submitOrder((String) listList.get(currentPosition).get(0), (String) listList
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.get(currentPosition).get(1), (String) listList.get(currentPosition).get(5),
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Edu_Survey_OrderInfo.ORDER_WEEK);
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}
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catch (Exception e)
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{
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e.printStackTrace();
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Log.v("log", "-->doInBackground() ERROR!");
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}
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return 0;
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}
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@Override
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protected void onProgressUpdate(Integer... values)
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{
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super.onProgressUpdate(values);
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}
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@Override
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protected void onPostExecute(Integer responseCode)
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{
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Log.v("log", "-->responseCode-" + responseCode);
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responseCode = 200;
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switch (responseCode)
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{
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case 200:
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ORDER_SUCCESS[currentPosition] = true;
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currentBtn.setText("已预约");
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currentBtn.setClickable(false);
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break;
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case 404:
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break;
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default:
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break;
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}
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Log.v("log", "-->onPostExecute()--currentPosition-" + currentPosition);
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Log.v("log", "-->onPostExecute()--ORDER_SUCCESS[" + currentPosition + "]-"
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+ ORDER_SUCCESS[currentPosition]);
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orderDialog.dismiss();
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super.onPostExecute(responseCode);
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}
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}
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}
效果图：
补充：
Button可以设置tag来唯一标记它，之后就可以通过listview.findViewWithTag(tag)找到了。不需要上面这么麻烦。
