一个实时获取股票数据的安卓应用程序

关键字：Stock，股票，安卓，Android Studio。

OS：Windows 10。

 

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：

 

源代码：https://github.com/ldlchina/Mystock