最近学习Android应用开发,不知道写一个什么样的程序来练练手,正好最近股票很火,就一个App来实时获取股票数据,取名为Mystock。使用开发工具Android Studio,需要从Android官网下载,下载地址:http://developer.android.com/sdk/index.html。不幸的是Android是Google公司的,任何和Google公司相关的在国内都无法直接访问,只能通过VPN访问。
下图为Android Studio打开一个工程的截图:
下面按步介绍Mystock的实现步骤。
1.以下是activa_main.xml的内容。上面一排是三个TextView,分别用来显示上证指数,深圳成指,创业板指。中间一排是一个EditText和一个Button,用来添加股票。下面是一个Table,用来显示添加的股票列表。
<LinearLayout xmlns:android=\"http://schemas.android.com/apk/res/android\" xmlns:tools=\"http://schemas.android.com/tools\" android:layout_width=\"match_parent\" android:layout_height=\"match_parent\" android:orientation=\"vertical\" tools:context=\".MainActivity\"> <LinearLayout android:layout_width=\"match_parent\" android:layout_height=\"wrap_content\" android:orientation=\"horizontal\"> <LinearLayout android:layout_width=\"0dp\" android:layout_weight=\"0.33\" android:layout_height=\"wrap_content\" android:orientation=\"vertical\" android:gravity=\"center\" > <TextView android:layout_width=\"wrap_content\" android:layout_height=\"wrap_content\" android:text=\"@string/stock_sh_name\"/> <TextView android:layout_width=\"wrap_content\" android:layout_height=\"wrap_content\" android:id=\"@+id/stock_sh_index\"/> <TextView android:layout_width=\"wrap_content\" android:layout_height=\"wrap_content\" android:textSize=\"12sp\" android:id=\"@+id/stock_sh_change\"/> </LinearLayout> <LinearLayout android:layout_width=\"0dp\" android:layout_weight=\"0.33\" android:layout_height=\"wrap_content\" android:orientation=\"vertical\" android:gravity=\"center\" > <TextView android:layout_width=\"wrap_content\" android:layout_height=\"wrap_content\" android:text=\"@string/stock_sz_name\"/> <TextView android:layout_width=\"wrap_content\" android:layout_height=\"wrap_content\" android:id=\"@+id/stock_sz_index\"/> <TextView android:layout_width=\"wrap_content\" android:layout_height=\"wrap_content\" android:textSize=\"12sp\" android:id=\"@+id/stock_sz_change\"/> </LinearLayout> <LinearLayout android:layout_width=\"0dp\" android:layout_weight=\"0.33\" android:layout_height=\"wrap_content\" android:orientation=\"vertical\" android:gravity=\"center\" > <TextView android:layout_width=\"wrap_content\" android:layout_height=\"wrap_content\" android:text=\"@string/stock_chuang_name\"/> <TextView android:layout_width=\"wrap_content\" android:layout_height=\"wrap_content\" android:id=\"@+id/stock_chuang_index\"/> <TextView android:layout_width=\"wrap_content\" android:layout_height=\"wrap_content\" android:textSize=\"12sp\" android:id=\"@+id/stock_chuang_change\"/> </LinearLayout> </LinearLayout> <LinearLayout android:orientation=\"horizontal\" android:layout_width=\"match_parent\" android:layout_height=\"wrap_content\"> <EditText android:layout_width=\"wrap_content\" android:layout_height=\"wrap_content\" android:inputType=\"number\" android:maxLength=\"6\" android:id=\"@+id/editText_stockId\" android:layout_weight=\"1\" /> <Button android:layout_width=\"wrap_content\" android:layout_height=\"wrap_content\" android:text=\"@string/button_add_label\" android:onClick=\"addStock\" /> </LinearLayout> <!--ListView android:layout_width=\"wrap_content\" android:layout_height=\"wrap_content\" android:id=\"@+id/listView\" /--> <ScrollView android:layout_width=\"match_parent\" android:layout_height=\"wrap_content\"> <TableLayout android:layout_width=\"match_parent\" android:layout_height=\"wrap_content\" android:id=\"@+id/stock_table\"></TableLayout> </ScrollView> </LinearLayout>
应用截图如下:
2.数据获取,这里使用sina提供的接口来实时获取股票数据,代码如下:
public void querySinaStocks(String list){ // Instantiate the RequestQueue. RequestQueue queue = Volley.newRequestQueue(this); String url =\"http://hq.sinajs.cn/list=\" + list; //http://hq.sinajs.cn/list=sh600000,sh600536 // Request a string response from the provided URL. StringRequest stringRequest = new StringRequest(Request.Method.GET, url, new Response.Listener<String>() { @Override public void onResponse(String response) { updateStockListView(sinaResponseToStocks(response)); } }, new Response.ErrorListener() { @Override public void onErrorResponse(VolleyError error) { } }); queue.add(stringRequest); }
这里发送Http请求用到了Volley,需要在build.gradle里面添加dependencies:compile \'com.mcxiaoke.volley:library:1.0.19\'。
3.定时刷新股票数据,使用了Timer,每隔两秒发送请求获取数据,代码如下:
Timer timer = new Timer(\"RefreshStocks\"); timer.schedule(new TimerTask() { @Override public void run() { refreshStocks(); } }, 0, 2000); private void refreshStocks(){ String ids = \"\"; for (String id : StockIds_){ ids += id; ids += \",\"; } querySinaStocks(ids); }
4.在程序退出时存储股票代码,下次打开App时,可以显示上次的股票列表。代码如下。
private void saveStocksToPreferences(){ String ids = \"\"; for (String id : StockIds_){ ids += id; ids += \",\"; } SharedPreferences sharedPref = getPreferences(Context.MODE_PRIVATE); SharedPreferences.Editor editor = sharedPref.edit(); editor.putString(StockIdsKey_, ids); editor.commit(); } @Override public void onDestroy() { super.onDestroy(); // Always call the superclass saveStocksToPreferences(); }
5.删除选中的股票,在menu_main.xml里面添加一个action。
<menu xmlns:android=\"http://schemas.android.com/apk/res/android\" xmlns:app=\"http://schemas.android.com/apk/res-auto\" xmlns:tools=\"http://schemas.android.com/tools\" tools:context=\".MainActivity\"> <item android:id=\"@+id/action_settings\" android:title=\"@string/action_settings\" android:orderInCategory=\"100\" app:showAsAction=\"never\" /> <item android:id=\"@+id/action_delete\" android:title=\"@string/action_delete\" android:orderInCategory=\"100\" app:showAsAction=\"never\" /> </menu>
代码响应事件并删除:
@Override public boolean onOptionsItemSelected(MenuItem item) { // Handle action bar item clicks here. The action bar will // automatically handle clicks on the Home/Up button, so long // as you specify a parent activity in AndroidManifest.xml. int id = item.getItemId(); //noinspection SimplifiableIfStatement if (id == R.id.action_settings) { return true; } else if(id == R.id.action_delete){ if(SelectedStockItems_.isEmpty()) return true; for (String selectedId : SelectedStockItems_){ StockIds_.remove(selectedId); TableLayout table = (TableLayout)findViewById(R.id.stock_table); int count = table.getChildCount(); for (int i = 1; i < count; i++){ TableRow row = (TableRow)table.getChildAt(i); LinearLayout nameId = (LinearLayout)row.getChildAt(0); TextView idText = (TextView)nameId.getChildAt(1); if(idText != null && idText.getText().toString() == selectedId){ table.removeView(row); break; } } } SelectedStockItems_.clear(); } return super.onOptionsItemSelected(item); }
屏幕截图:
6.当有大额委托挂单时,发送消息提醒,代码如下:
{ ... String text = \"\"; String sBuy = getResources().getString(R.string.stock_buy); String sSell = getResources().getString(R.string.stock_sell); if(Double.parseDouble(stock.b1_ )>= StockLargeTrade_) { text += sBuy + \"1:\" + stock.b1_ + \",\"; } if(Double.parseDouble(stock.b2_ )>= StockLargeTrade_) { text += sBuy + \"2:\" + stock.b2_ + \",\"; } if(Double.parseDouble(stock.b3_ )>= StockLargeTrade_) { text += sBuy + \"3:\" + stock.b3_ + \",\"; } if(Double.parseDouble(stock.b4_ )>= StockLargeTrade_) { text += sBuy + \"4:\" + stock.b4_ + \",\"; } if(Double.parseDouble(stock.b5_ )>= StockLargeTrade_) { text += sBuy + \"5:\" + stock.b5_ + \",\"; } if(Double.parseDouble(stock.s1_ )>= StockLargeTrade_) { text += sSell + \"1:\" + stock.s1_ + \",\"; } if(Double.parseDouble(stock.s2_ )>= StockLargeTrade_) { text += sSell + \"2:\" + stock.s2_ + \",\"; } if(Double.parseDouble(stock.s3_ )>= StockLargeTrade_) { text += sSell + \"3:\" + stock.s3_ + \",\"; } if(Double.parseDouble(stock.s4_ )>= StockLargeTrade_) { text += sSell + \"4:\" + stock.s4_ + \",\"; } if(Double.parseDouble(stock.s5_ )>= StockLargeTrade_) { text += sSell + \"5:\" + stock.s5_ + \",\"; } if(text.length() > 0) sendNotifation(Integer.parseInt(sid), stock.name_, text); ... } public void sendNotifation(int id, String title, String text){ NotificationCompat.Builder nBuilder = new NotificationCompat.Builder(this); nBuilder.setSmallIcon(R.drawable.ic_launcher); nBuilder.setContentTitle(title); nBuilder.setContentText(text); nBuilder.setVibrate(new long[]{100, 100, 100}); nBuilder.setLights(Color.RED, 1000, 1000); NotificationManager notifyMgr = (NotificationManager) getSystemService(NOTIFICATION_SERVICE); notifyMgr.notify(id, nBuilder.build()); }
屏幕截图:
以上通过图文并茂的方式给大家分享了一个实时获取股票数据的android app应用程序源码,希望大家喜欢。
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