Android ListView 总结

1.  指定item 不能点击事件

覆写Adapter 的 isEnabled 方法：

@Override    public boolean isEnabled(int position) {        if(position == 4) {            return false;        }        return super.isEnabled(position);    }

postion == 4, 是不能点击的，就是没有动画效果。

2. Item 的内部布局如果有CheckBox 之类需要响应

Item 的布局需要需要加入android:descendantFocusability="blocksDescendants" 这个属性，就可以响应子view 的事件。

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"    android:orientation="horizontal"    android:layout_width="match_parent"    android:descendantFocusability="blocksDescendants"    android:layout_height="wrap_content"    android:gravity="center"    android:minHeight="60dp">    <CheckBox        android:id="@+id/task_complete"        android:layout_width="wrap_content"        android:layout_height="wrap_content" />...

3. ListView 的分类显示

主要是在根据position 不同在getview 的时候返回不同的view。

public class TaskListAdapter extends BaseAdapter {    private Context mContext;    private List<String> mTaskList;    private List<String> mTaskList2;    public TaskListAdapter() {        super();    }    public TaskListAdapter(Context context, List<String> data,List<String> data2) {        mContext = context;        mTaskList = data;        mTaskList2 = data2;    }    @Override    public int getCount() {        return mTaskList.size() + 1 + mTaskList2.size();    }    @Override    public Object getItem(int position) {        if(position == mTaskList.size())            return null;        if(position < mTaskList.size()) {            return mTaskList.get(position);        } else {            return mTaskList2.get(position - mTaskList.size() -1);        }    }    @Override    public long getItemId(int position) {        return position;    }    @Override    public View getView(final int position, View convertView, ViewGroup parent) {        ViewHolder viewHolder = null;        LayoutInflater layoutInflater = LayoutInflater.from(mContext);        //if(position == mTaskList.size()) {        //    convertView = layoutInflater.inflate(R.layout.item_task_separator, null);        //}        //if(convertView == null) {            viewHolder = new ViewHolder();            if(position == mTaskList.size()) {                convertView = layoutInflater.inflate(R.layout.item_task_separator, null);            } else {                convertView = layoutInflater.inflate(R.layout.item_task_layout, null);                viewHolder.title = (TextView) convertView.findViewById(R.id.task_title);                viewHolder.desc = (TextView) convertView.findViewById(R.id.task_desc);                viewHolder.due_date = (TextView) convertView.findViewById(R.id.task_due_date);                viewHolder.due_time = (TextView) convertView.findViewById(R.id.task_due_time);                viewHolder.complete = (CheckBox) convertView.findViewById(R.id.task_complete);                if(true) {                    viewHolder.select = (CheckBox) convertView.findViewById(R.id.task_select);                    viewHolder.select.setVisibility(View.VISIBLE);                }                convertView.setTag(viewHolder);            }        //} else if(position != mTaskList.size()){        //    viewHolder = (ViewHolder) convertView.getTag();        //}        if(position != mTaskList.size()) {            String taskItem = (String) getItem(position);            viewHolder.title.setText(taskItem);            //viewHolder.desc.setText(taskItem.desc);            Calendar calendar = Calendar.getInstance();            //calendar.setTimeInMillis(taskItem.due_date);            String formatDate = "MMM dd";            if(Locale.CHINA.getCountry().equals(Locale.getDefault().getCountry())) {                formatDate = "MM月dd日";            }            SimpleDateFormat format = new SimpleDateFormat(formatDate, Locale.getDefault());            Log.d("zhouyong", "calendar = " + calendar.toString());            Log.d("zhouyong","display name = "+Locale.getDefault().getCountry() + " "+Locale.CHINA.getCountry());            viewHolder.due_date.setText(format.format(calendar.getTime()));            format = new SimpleDateFormat("a hh:mm", Locale.getDefault());            viewHolder.due_time.setText(format.format(calendar.getTime()));            //viewHolder.complete.setChecked(taskItem.complete == 1 ? true : false);            viewHolder.complete.setOnClickListener(new View.OnClickListener() {                @Override                public void onClick(View v) {                    Log.d("zhouyong", "complete = " + ((CheckBox) v).isChecked());                }            });        }        return convertView;    }    private class ViewHolder {        TextView title;        TextView desc;        TextView due_date;        TextView due_time;        CheckBox complete;        CheckBox select;    }}

4. ListView 默认显示在什么位置

mListView.setSelection(position); listview.post(new Runnable() {  @Override  public void run() {    listview.smoothScrollToPosition(position);  }});

在设置值adapter 之后调用，或者是adapter.notifyDataSetChanged() 之后调用。smoothScrollToPosition 有动画效果。

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