利用FootView实现ListView滑动动态
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好了，下面开始今天的内容，老规矩，先上图
这张图片左边部分和右边部分还是有很大的不同，不是指内容上，是指布局上，左边的是我今天写这次代码之前的布局，root是用的RelativeLayout，右边是用的FrameLayout，体现在界面上就是右边的list内容可以顶到最上面，而左边的list是在上面的topBar下面。
看布局代码：布局代码还用到了include，主要是用来重用布局的。include一定要放在最下面啊，因为FrameLayout后面的内容会覆盖掉前面的内容，如果你放在上面，将会看不到标题栏。
Java代码
<?xml version="1.0" encoding="utf-8"?><FrameLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="fill_parent" android:layout_height="fill_parent"> <LinearLayout android:orientation="vertical" android:background="#ffffffff" android:layout_width="fill_parent" android:layout_height="fill_parent"> <ListView android:id="@id/android:list" android:paddingTop="45.0dip" android:paddingBottom="50.0dip" android:layout_width="fill_parent" android:cacheColorHint="#00000000" android:fadingEdge="none" android:fastScrollEnabled="false" android:clipToPadding="false" android:layout_height="wrap_content" android:divider="@drawable/list_divider"/> <TextView android:text="" android:textSize="20.0sp" android:textColor="#ff5a5a5a" android:gravity="center_horizontal" android:layout_width="fill_parent" android:layout_height="wrap_content" android:paddingTop="15.0dip" android:visibility="invisible"/> </LinearLayout> <include android:id="@+id/home_top" layout="@layout/top_panel" android:layout_width="fill_parent" android:layout_height="wrap_content" /></FrameLayout>
把微博列表ListView往下拉，此时还未到加载到数据的最底部。
继续往下拉，ok，见底了，看到更多的提示了嘛，点击它
出现进度条提示
加载完毕之后显示新的一页，继续往下拉，又会看见更多提示，然后如此循环。主要是利用了隐藏。
下面看看主的Activity的代码：
Java代码
public class HomeTimeLineActivity extends ListActivity implements OnItemClickListener,OnItemLongClickListener{ private DataHelper dataHelper; private UserInfo user; private MyWeiboSync weibo; private ListView listView; private HomeAdapter adapter; private JSONArray array; private AsyncImageLoader asyncImageLoader; private Handler handler; private ProgressDialog progressDialog; private View top_panel; private Button top_btn_left; private Button top_btn_right; private TextView top_title; private LinearLayout list_footer; private TextView tv_msg; private LinearLayout loading; private List<JSONObject> list;//微博数据列表 private ExecutorService executorService; private static int PAGE_SIZE = 5;//每页显示的微博条数 private int TOTAL_PAGE = 0;//当前已经记在的微博页数 private static int THREADPOOL_SIZE = 5;//线程池的大小 @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.home); setUpViews(); setUpListeners(); dataHelper = DataBaseContext.getInstance(getApplicationContext()); weibo = WeiboContext.getInstance(); List<UserInfo> userList = dataHelper.GetUserList(false); SharedPreferences preferences = getSharedPreferences("default_user",Activity.MODE_PRIVATE); String nick = preferences.getString("user_default_nick", "");//取得默认账号信息 if (nick != "") { user = dataHelper.getUserByName(nick,userList); top_title.setText(nick);//顶部工具栏昵称 } weibo.setAccessTokenKey(user.getToken()); weibo.setAccessTokenSecrect(user.getTokenSecret()); progressDialog = new ProgressDialog(HomeTimeLineActivity.this);// 生成一个进度条 progressDialog.setProgressStyle(ProgressDialog.STYLE_SPINNER); progressDialog.setTitle("请稍等"); progressDialog.setMessage("正在读取数据中!"); handler = new GetHomeTimeLineHandler(); executorService.submit(new GetHomeTimeLineThread());//耗时操作,开启一个新线程获取数据 progressDialog.show(); } private void setUpViews(){ list_footer = (LinearLayout)LayoutInflater.from(HomeTimeLineActivity.this).inflate(R.layout.list_footer, null); tv_msg = (TextView)list_footer.findViewById(R.id.tv_msg); loading = (LinearLayout)list_footer.findViewById(R.id.loading); listView = getListView(); top_panel = (View)findViewById(R.id.home_top); top_btn_left = (Button)top_panel.findViewById(R.id.top_btn_left); top_btn_right = (Button)top_panel.findViewById(R.id.top_btn_right); top_title = (TextView)top_panel.findViewById(R.id.top_title); listView.addFooterView(list_footer);//这儿是关键中的关键呀，利用FooterVIew分页动态加载 list = new ArrayList<JSONObject>(); executorService = Executors.newFixedThreadPool(THREADPOOL_SIZE); } private void setUpListeners(){ listView.setOnItemClickListener(this); listView.setOnItemLongClickListener(this); top_btn_right.setOnClickListener(new OnClickListener() { @Override public void onClick(View v) { Intent intent = new Intent(HomeTimeLineActivity.this,AddWeiboActivity.class); startActivity(intent); } }); tv_msg.setOnClickListener(new OnClickListener() { @Override public void onClick(View v) { //Toast.makeText(HomeTimeLineActivity.this, "我将消失了", Toast.LENGTH_SHORT).show(); executorService.submit(new GetHomeTimeLineThread()); tv_msg.setVisibility(View.GONE);//隐藏更多提示的TextView loading.setVisibility(View.VISIBLE);//显示最下方的进度条 } }); } class GetHomeTimeLineHandler extends Handler { @Override public void handleMessage(Message msg) { adapter = new HomeAdapter(HomeTimeLineActivity.this, list); listView.setAdapter(adapter); listView.setSelection((TOTAL_PAGE-1)*PAGE_SIZE+1);//设置最新获取一页数据成功后显示数据的起始数据 progressDialog.dismiss();// 关闭进度条 loading.setVisibility(View.GONE);//隐藏下方的进度条 tv_msg.setVisibility(View.VISIBLE);//显示出更多提示TextView } } class GetHomeTimeLineThread extends Thread { @Override public void run() { refreshList(); Message msg = handler.obtainMessage();//通知线程来处理范围的数据 handler.sendMessage(msg); } } private void refreshList(){ String jsonStr = weibo.getHomeMsg(weibo.getAccessTokenKey(), weibo.getAccessTokenSecrect(), PageFlag.PageFlag_First, (TOTAL_PAGE+1)*PAGE_SIZE); try { JSONObject dataObj = new JSONObject(jsonStr).getJSONObject("data"); array = dataObj.getJSONArray("info"); if(array!=null&&array.length()>0){ TOTAL_PAGE++; list.clear(); int lenth =array.length(); for(int i = 0;i<lenth;i++){ list.add(array.optJSONObject(i)); } } } catch (JSONException e) { e.printStackTrace(); } } class HomeAdapter extends BaseAdapter { private Context context; private LayoutInflater inflater; private List<JSONObject> list; public HomeAdapter(Context context, List<JSONObject> list) { super(); this.context = context; this.list = list; this.inflater = LayoutInflater.from(context); } @Override public int getCount() { return list.size(); } @Override public Object getItem(int position) { return list.get(position); } @Override public long getItemId(int position) { return position; } @Override public View getView(final int position, View convertView, ViewGroup parent) { asyncImageLoader = new AsyncImageLoader(); HomeViewHolder viewHolder = new HomeViewHolder(); JSONObject data = (JSONObject)list.get(position); JSONObject source = null; convertView = inflater.inflate(R.layout.home_list_item, null); try { source = data.getJSONObject("source"); } catch (JSONException e1) { e1.printStackTrace(); } viewHolder.home_headicon = (ImageView) convertView.findViewById(R.id.home_headicon); viewHolder.home_nick = (TextView) convertView.findViewById(R.id.home_nick); viewHolder.home_hasimage = (ImageView) convertView.findViewById(R.id.home_hasimage); viewHolder.home_timestamp = (TextView) convertView.findViewById(R.id.home_timestamp); viewHolder.home_origtext = (TextView) convertView.findViewById(R.id.home_origtext); viewHolder.home_source = (TextView) convertView.findViewById(R.id.home_source); if(data!=null){ try { convertView.setTag(data.get("id")); //viewHolder.home_headicon.setImageDrawable(ImageUtil.getDrawableFromUrl(data.getString("head")+"/100"));//同步加载图片 viewHolder.home_nick.setText(data.getString("nick")); viewHolder.home_timestamp.setText(TimeUtil.converTime(Long.parseLong(data.getString("timestamp")))); //viewHolder.home_origtext.setText(data.getString("origtext"), TextView.BufferType.SPANNABLE); /*Spannable spannable = (Spannable)viewHolder.home_origtext.getText();//加高亮显示 spannable.setSpan(new BackgroundColorSpan(Color.RED), 0, 1, Spannable.SPAN_EXCLUSIVE_EXCLUSIVE);*/ SpannableString spannable = new SpannableString(data.getString("origtext")); //把字符串解析成本地表情 spannable = TextUtil.getImageSpannableString(spannable, RegexUtil.getStartAndEndIndex(data.getString("origtext"), Pattern.compile("\\/[\u4e00-\u9fa5a-zA-Z]{1,3}")), getResources()); viewHolder.home_origtext.setText(spannable); if(source!=null){ viewHolder.home_source.setText(source.getString("nick")+":"+source.getString("origtext")); viewHolder.home_source.setBackgroundResource(R.drawable.home_source_bg); } //异步加载图片 Drawable cachedImage = asyncImageLoader.loadDrawable(data.getString("head")+"/100",viewHolder.home_headicon, new ImageCallback(){ @Override public void imageLoaded(Drawable imageDrawable,ImageView imageView, String imageUrl) { imageView.setImageDrawable(imageDrawable); } }); if (cachedImage == null) { viewHolder.home_headicon.setImageResource(R.drawable.icon); } else { viewHolder.home_headicon.setImageDrawable(cachedImage); } if(data.getJSONArray("image")!=null){ viewHolder.home_hasimage.setImageResource(R.drawable.hasimage); } } catch (JSONException e) { e.printStackTrace(); } catch (Exception e) { e.printStackTrace(); } } return convertView; } } static class HomeViewHolder { private ImageView home_headicon; private TextView home_nick; private TextView home_timestamp; private TextView home_origtext; private TextView home_source; private ImageView home_hasimage; } @Override public boolean onItemLongClick(AdapterView<?> arg0, View arg1, int position,long arg3) { CharSequence [] items = null; try { items= new CharSequence[]{"转播","对话","点评","收藏",((JSONObject)array.opt(position)).getString("nick"),"取消"}; } catch (JSONException e) { e.printStackTrace(); } new AlertDialog.Builder(HomeTimeLineActivity.this).setTitle("选项").setItems(items,new DialogInterface.OnClickListener() { @Override public void onClick(DialogInterface dialog, int which) { switch (which) { case 0: { } break; case 1: { } break; case 2: { } break; case 3: { } break; case 4: { } break; case 5: { } break; default: break; } } }).show(); return false; } @Override public void onItemClick(AdapterView<?> arg0, View arg1, int position, long arg3) { JSONObject weiboInfo = (JSONObject)array.opt(position); Intent intent = new Intent(HomeTimeLineActivity.this, WeiboDetailActivity.class); try { intent.putExtra("weiboid", weiboInfo.getString("id")); startActivity(intent); } catch (JSONException e) { e.printStackTrace(); } } @Override public boolean onCreateOptionsMenu(Menu menu){ super.onCreateOptionsMenu(menu); MenuInflater menuInflater = getMenuInflater(); menuInflater.inflate(R.menu.home_timeline_menu, menu); return true; } @Override public boolean onOptionsItemSelected(MenuItem item) { switch (item.getItemId()) { case R.id.menu_settings: { } break; case R.id.menu_official: { } break; case R.id.menu_feedback: { } break; case R.id.menu_account: { Intent intent = new Intent(HomeTimeLineActivity.this, AccountActivity.class); startActivity(intent); } break; case R.id.menu_about: { Intent intent = new Intent(HomeTimeLineActivity.this, AddWeiboActivity.class); startActivity(intent); } break; case R.id.menu_quit: { } break; default: break; } return true; }}下面的布局文件是你所看见的更多提示和下方的进度条布局文件：
Java代码
<?xml version="1.0" encoding="UTF-8"?><LinearLayout android:layout_width="fill_parent" android:layout_height="wrap_content" android:minHeight="?android:listPreferredItemHeight" xmlns:android="http://schemas.android.com/apk/res/android"> <TextView android:textSize="16.0sp" android:textColor="#ff545454" android:gravity="center" android:id="@id/tv_msg" android:layout_width="fill_parent" android:layout_height="fill_parent" android:text="更多"/> <LinearLayout android:gravity="center" android:layout_gravity="center" android:orientation="horizontal" android:id="@id/loading" android:layout_width="fill_parent" android:layout_height="fill_parent"> <ProgressBar android:layout_gravity="center_vertical" android:id="@id/footprogress" android:layout_width="wrap_content" android:layout_height="wrap_content" android:indeterminateBehavior="repeat" style="?android:progressBarStyleSmallInverse" /> <TextView android:textColor="#ff000000" android:gravity="left|center" android:padding="3.0px" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="读取中" /> </LinearLayout></LinearLayout>
最后有一个问题就是 就是腾讯API首页时间线没有提供和分页相关的参数，什么意思啊，举个例子：就是说点击更多之前你加载的是0-10条数据，假设一页大小是10条数据，点击更多之后，就会多10条，但是API调用时是请求的0-20条（关于这个没有什么可争辩的，你们自己试一试就知道了），故中间代码有一处我把list clear了一下，要不然要出错。这肯能是与首页时间线的数据更新速度很快有关，但不管怎么说，分页我们已经实现了，以后的所有页面都会用到这个footView分页的技术，是不是很爽，比下一页，上一页，是不是爽多了？
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