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  • Android腾讯微博客户端开发5:利用FootView实现ListView滑动动态加载实现分页

    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。 
    Java代码  收藏代码
    1. <?xml version="1.0" encoding="utf-8"?>  
    2. <FrameLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="fill_parent" android:layout_height="fill_parent">  
    3.     <LinearLayout android:orientation="vertical" android:background="#ffffffff" android:layout_width="fill_parent" android:layout_height="fill_parent">  
    4.         <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"  
    5.             android:layout_height="wrap_content" android:divider="@drawable/list_divider"/>  
    6.         <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"/>  
    7.     </LinearLayout>  
    8.     <include android:id="@+id/home_top" layout="@layout/top_panel" android:layout_width="fill_parent" android:layout_height="wrap_content" />  
    9. </FrameLayout>  

    把图片往下拉，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，点击他 
     

    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  收藏代码
    1. public class HomeTimeLineActivity extends ListActivity implements OnItemClickListener,OnItemLongClickListener{  
    2.       
    3.     private DataHelper dataHelper;  
    4.     private UserInfo user;  
    5.     private MyWeiboSync weibo;  
    6.     private ListView listView;  
    7.     private HomeAdapter adapter;  
    8.     private JSONArray array;  
    9.     private AsyncImageLoader asyncImageLoader;  
    10.     private Handler handler;  
    11.     private ProgressDialog progressDialog;  
    12.     private View top_panel;  
    13.     private Button top_btn_left;  
    14.     private Button top_btn_right;  
    15.     private TextView top_title;  
    16.     private LinearLayout list_footer;  
    17.     private TextView tv_msg;  
    18.     private LinearLayout loading;  
    19.     private List<JSONObject> list;//微博数据列表  
    20.     private ExecutorService executorService;  
    21.     private static int PAGE_SIZE = 5;//每页显示的微博条数  
    22.     private int TOTAL_PAGE = 0;//当前已经记在的微博页数  
    23.     private static int THREADPOOL_SIZE = 5;//线程池的大小  
    24.       
    25.     @Override  
    26.     protected void onCreate(Bundle savedInstanceState) {  
    27.         super.onCreate(savedInstanceState);  
    28.         setContentView(R.layout.home);  
    29.         setUpViews();  
    30.         setUpListeners();  
    31.           
    32.         dataHelper = DataBaseContext.getInstance(getApplicationContext());  
    33.         weibo = WeiboContext.getInstance();  
    34.           
    35.         List<UserInfo> userList = dataHelper.GetUserList(false);  
    36.           
    37.         SharedPreferences preferences = getSharedPreferences("default_user",Activity.MODE_PRIVATE);  
    38.         String nick = preferences.getString("user_default_nick", "");//取得默认账号信息  
    39.           
    40.         if (nick != "") {  
    41.             user = dataHelper.getUserByName(nick,userList);  
    42.             top_title.setText(nick);//顶部工具栏昵称  
    43.         }  
    44.           
    45.         weibo.setAccessTokenKey(user.getToken());  
    46.         weibo.setAccessTokenSecrect(user.getTokenSecret());  
    47.           
    48.         progressDialog = new ProgressDialog(HomeTimeLineActivity.this);// 生成一个进度条  
    49.         progressDialog.setProgressStyle(ProgressDialog.STYLE_SPINNER);  
    50.         progressDialog.setTitle("请稍等");  
    51.         progressDialog.setMessage("正在读取数据中!");  
    52.         handler = new GetHomeTimeLineHandler();  
    53.           
    54.         executorService.submit(new GetHomeTimeLineThread());//耗时操作,开启一个新线程获取数据  
    55.         progressDialog.show();  
    56.     }  
    57.       
    58.     private void setUpViews(){  
    59.         list_footer = (LinearLayout)LayoutInflater.from(HomeTimeLineActivity.this).inflate(R.layout.list_footer, null);  
    60.         tv_msg = (TextView)list_footer.findViewById(R.id.tv_msg);  
    61.         loading = (LinearLayout)list_footer.findViewById(R.id.loading);  
    62.         listView = getListView();  
    63.         top_panel = (View)findViewById(R.id.home_top);  
    64.         top_btn_left = (Button)top_panel.findViewById(R.id.top_btn_left);  
    65.         top_btn_right = (Button)top_panel.findViewById(R.id.top_btn_right);  
    66.         top_title = (TextView)top_panel.findViewById(R.id.top_title);  
    67.         listView.addFooterView(list_footer);//这儿是关键中的关键呀，利用FooterVIew分页动态加载  
    68.         list = new ArrayList<JSONObject>();  
    69.         executorService = Executors.newFixedThreadPool(THREADPOOL_SIZE);  
    70.     }  
    71.       
    72.     private void setUpListeners(){  
    73.         listView.setOnItemClickListener(this);  
    74.         listView.setOnItemLongClickListener(this);  
    75.         top_btn_right.setOnClickListener(new OnClickListener() {  
    76.             @Override  
    77.             public void onClick(View v) {  
    78.                 Intent intent = new Intent(HomeTimeLineActivity.this,AddWeiboActivity.class);  
    79.                 startActivity(intent);  
    80.             }  
    81.         });  
    82.         tv_msg.setOnClickListener(new OnClickListener() {  
    83.             @Override  
    84.             public void onClick(View v) {  
    85.                 //Toast.makeText(HomeTimeLineActivity.this, "我将消失了", Toast.LENGTH_SHORT).show();  
    86.                 executorService.submit(new GetHomeTimeLineThread());  
    87.                 tv_msg.setVisibility(View.GONE);//隐藏更多提示的TextView  
    88.                 loading.setVisibility(View.VISIBLE);//显示最下方的进度条  
    89.             }  
    90.         });  
    91.     }  
    92.       
    93.     class GetHomeTimeLineHandler extends Handler {  
    94.         @Override  
    95.         public void handleMessage(Message msg) {  
    96.             adapter = new HomeAdapter(HomeTimeLineActivity.this, list);  
    97.             listView.setAdapter(adapter);  
    98.             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  
    99.             progressDialog.dismiss();// 关闭进度条  
    100.             loading.setVisibility(View.GONE);//隐藏下方的进度条  
    101.             tv_msg.setVisibility(View.VISIBLE);//显示出更多提示TextView  
    102.         }  
    103.     }  
    104.       
    105.     class GetHomeTimeLineThread extends Thread {  
    106.         @Override  
    107.         public void run() {  
    108.             refreshList();  
    109.             Message msg = handler.obtainMessage();//通知线程来处理范围的数据  
    110.             handler.sendMessage(msg);  
    111.         }  
    112.     }  
    113.       
    114.     private void refreshList(){  
    115.         String jsonStr = weibo.getHomeMsg(weibo.getAccessTokenKey(), weibo.getAccessTokenSecrect(), PageFlag.PageFlag_First, (TOTAL_PAGE+1)*PAGE_SIZE);  
    116.         try {  
    117.             JSONObject dataObj = new JSONObject(jsonStr).getJSONObject("data");  
    118.             array = dataObj.getJSONArray("info");  
    119.             if(array!=null&&array.length()>0){  
    120.                 TOTAL_PAGE++;  
    121.                 list.clear();  
    122.                 int lenth =array.length();  
    123.                 for(int i = 0;i<lenth;i++){  
    124.                     list.add(array.optJSONObject(i));  
    125.                 }  
    126.             }  
    127.         } catch (JSONException e) {  
    128.             e.printStackTrace();  
    129.         }  
    130.     }  
    131.       
    132.       
    133.     class HomeAdapter extends BaseAdapter {  
    134.         private Context context;  
    135.         private LayoutInflater inflater;  
    136.         private List<JSONObject> list;  
    137.           
    138.         public HomeAdapter(Context context, List<JSONObject> list) {  
    139.             super();  
    140.             this.context = context;  
    141.             this.list = list;  
    142.             this.inflater = LayoutInflater.from(context);  
    143.         }  
    144.   
    145.         @Override  
    146.         public int getCount() {  
    147.             return list.size();  
    148.         }  
    149.   
    150.         @Override  
    151.         public Object getItem(int position) {  
    152.             return list.get(position);  
    153.         }  
    154.   
    155.         @Override  
    156.         public long getItemId(int position) {  
    157.             return position;  
    158.         }  
    159.   
    160.         @Override  
    161.         public View getView(final int position, View convertView, ViewGroup parent) {  
    162.             asyncImageLoader = new AsyncImageLoader();  
    163.             HomeViewHolder viewHolder = new HomeViewHolder();  
    164.             JSONObject data = (JSONObject)list.get(position);  
    165.             JSONObject source = null;  
    166.             convertView = inflater.inflate(R.layout.home_list_item, null);  
    167.             try {  
    168.                 source = data.getJSONObject("source");  
    169.             } catch (JSONException e1) {  
    170.                 e1.printStackTrace();   
    171.             }  
    172.             viewHolder.home_headicon = (ImageView) convertView.findViewById(R.id.home_headicon);  
    173.             viewHolder.home_nick = (TextView) convertView.findViewById(R.id.home_nick);  
    174.             viewHolder.home_hasimage = (ImageView) convertView.findViewById(R.id.home_hasimage);  
    175.             viewHolder.home_timestamp = (TextView) convertView.findViewById(R.id.home_timestamp);  
    176.             viewHolder.home_origtext = (TextView) convertView.findViewById(R.id.home_origtext);  
    177.             viewHolder.home_source = (TextView) convertView.findViewById(R.id.home_source);  
    178.               
    179.             if(data!=null){  
    180.                 try {  
    181.                     convertView.setTag(data.get("id"));  
    182.                     //viewHolder.home_headicon.setImageDrawable(ImageUtil.getDrawableFromUrl(data.getString("head")+"/100"));//同步加载图片  
    183.                     viewHolder.home_nick.setText(data.getString("nick"));  
    184.                     viewHolder.home_timestamp.setText(TimeUtil.converTime(Long.parseLong(data.getString("timestamp"))));  
    185.                     //viewHolder.home_origtext.setText(data.getString("origtext"), TextView.BufferType.SPANNABLE);  
    186.                       
    187.                     /*Spannable spannable = (Spannable)viewHolder.home_origtext.getText();//加高亮显示 
    188.                     spannable.setSpan(new BackgroundColorSpan(Color.RED), 0, 1, Spannable.SPAN_EXCLUSIVE_EXCLUSIVE);*/  
    189.                       
    190.                     SpannableString spannable = new SpannableString(data.getString("origtext"));  
    191.                     //把字符串解析成本地表情  
    192.                     spannable = TextUtil.getImageSpannableString(spannable, RegexUtil.getStartAndEndIndex(data.getString("origtext"), Pattern.compile("\\/[\u4e00-\u9fa5a-zA-Z]{1,3}")), getResources());  
    193.                     viewHolder.home_origtext.setText(spannable);  
    194.                       
    195.                       
    196.                     if(source!=null){  
    197.                         viewHolder.home_source.setText(source.getString("nick")+":"+source.getString("origtext"));  
    198.                         viewHolder.home_source.setBackgroundResource(R.drawable.home_source_bg);  
    199.                     }  
    200.                     //异步加载图片  
    201.                     Drawable cachedImage = asyncImageLoader.loadDrawable(data.getString("head")+"/100",viewHolder.home_headicon, new ImageCallback(){  
    202.                         @Override  
    203.                         public void imageLoaded(Drawable imageDrawable,ImageView imageView, String imageUrl) {  
    204.                             imageView.setImageDrawable(imageDrawable);  
    205.                         }  
    206.                     });  
    207.                     if (cachedImage == null) {  
    208.                         viewHolder.home_headicon.setImageResource(R.drawable.icon);  
    209.                     } else {  
    210.                         viewHolder.home_headicon.setImageDrawable(cachedImage);  
    211.                     }  
    212.                     if(data.getJSONArray("image")!=null){  
    213.                         viewHolder.home_hasimage.setImageResource(R.drawable.hasimage);  
    214.                     }  
    215.                 } catch (JSONException e) {  
    216.                     e.printStackTrace();  
    217.                 } catch (Exception e) {  
    218.                     e.printStackTrace();  
    219.                 }  
    220.             }  
    221.             return convertView;  
    222.         }  
    223.     }  
    224.       
    225.     static class HomeViewHolder {  
    226.         private ImageView home_headicon;  
    227.         private TextView home_nick;  
    228.         private TextView home_timestamp;  
    229.         private TextView home_origtext;  
    230.         private TextView home_source;  
    231.         private ImageView home_hasimage;  
    232.     }  
    233.   
    234.     @Override  
    235.     public boolean onItemLongClick(AdapterView<?> arg0, View arg1, int position,long arg3) {  
    236.         CharSequence [] items = null;  
    237.         try {  
    238.             items= new CharSequence[]{"转播","对话","点评","收藏",((JSONObject)array.opt(position)).getString("nick"),"取消"};  
    239.         } catch (JSONException e) {  
    240.             e.printStackTrace();  
    241.         }  
    242.         new AlertDialog.Builder(HomeTimeLineActivity.this).setTitle("选项").setItems(items,new DialogInterface.OnClickListener() {  
    243.             @Override  
    244.             public void onClick(DialogInterface dialog, int which) {  
    245.                         switch (which) {  
    246.                         case 0: {  
    247.                         }  
    248.                             break;  
    249.                         case 1: {  
    250.                         }  
    251.                             break;  
    252.                         case 2: {  
    253.                         }  
    254.                             break;  
    255.                         case 3: {  
    256.                         }  
    257.                             break;  
    258.                         case 4: {  
    259.                         }  
    260.                             break;  
    261.                         case 5: {  
    262.                         }  
    263.                             break;  
    264.                         default:  
    265.                             break;  
    266.                         }  
    267.             }  
    268.         }).show();  
    269.         return false;  
    270.     }  
    271.   
    272.     @Override  
    273.     public void onItemClick(AdapterView<?> arg0, View arg1, int position, long arg3) {  
    274.         JSONObject weiboInfo = (JSONObject)array.opt(position);  
    275.         Intent intent = new Intent(HomeTimeLineActivity.this, WeiboDetailActivity.class);  
    276.         try {  
    277.             intent.putExtra("weiboid", weiboInfo.getString("id"));  
    278.             startActivity(intent);  
    279.         } catch (JSONException e) {  
    280.             e.printStackTrace();  
    281.         }  
    282.     }  
    283.       
    284.     @Override  
    285.     public boolean onCreateOptionsMenu(Menu menu){  
    286.         super.onCreateOptionsMenu(menu);  
    287.         MenuInflater menuInflater = getMenuInflater();  
    288.         menuInflater.inflate(R.menu.home_timeline_menu, menu);  
    289.         return true;  
    290.     }  
    291.       
    292.     @Override  
    293.     public boolean onOptionsItemSelected(MenuItem item) {  
    294.         switch (item.getItemId()) {  
    295.         case R.id.menu_settings: {  
    296.   
    297.         }  
    298.             break;  
    299.         case R.id.menu_official: {  
    300.   
    301.         }  
    302.             break;  
    303.         case R.id.menu_feedback: {  
    304.   
    305.         }  
    306.             break;  
    307.         case R.id.menu_account: {  
    308.             Intent intent = new Intent(HomeTimeLineActivity.this,  
    309.                     AccountActivity.class);  
    310.             startActivity(intent);  
    311.         }  
    312.             break;  
    313.         case R.id.menu_about: {  
    314.             Intent intent = new Intent(HomeTimeLineActivity.this,  
    315.                     AddWeiboActivity.class);  
    316.             startActivity(intent);  
    317.         }  
    318.             break;  
    319.         case R.id.menu_quit: {  
    320.   
    321.         }  
    322.             break;  
    323.         default:  
    324.             break;  
    325.         }  
    326.         return true;  
    327.     }  
    328. }  


    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  收藏代码
    1. <?xml version="1.0" encoding="UTF-8"?>  
    2. <LinearLayout android:layout_width="fill_parent" android:layout_height="wrap_content" android:minHeight="?android:listPreferredItemHeight"  
    3.   xmlns:android="http://schemas.android.com/apk/res/android">  
    4.     <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"/>  
    5.     <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">  
    6.         <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" />  
    7.         <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" />  
    8.     </LinearLayout>  
    9. </LinearLayout>  
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  • 原文地址：https://www.cnblogs.com/afly/p/2360238.html
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