把微博列表ListView往下拉,此时还未到加载到数据的最底部。
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继续往下拉,ok,见底了,看到更多的提示了嘛,点击它
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出现进度条提示
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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。
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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;
- }
- }
复制代码
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