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。

国内下载地址：https://developer.android.google.cn/studio/

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

安装文件下载：http://files.cnblogs.com/files/ldlchina/Mystock.apk

参考资料：

http://developer.android.com/training/index.html （需通过VPN访问）。