在这里我们要使用android listview来实现显示股票行情，效果图如下，红色表示股票价格上涨，绿色表示股票价格下跌。
第一步、定义color.xml如下：
<?xml version="1.0" encoding="utf-8"?>
<resources>
<color name="color_dark_grey">#808080</color>
<color name="color_black">#000000</color>
<color name="color_green">#00ff00</color>
<color name="color_red">#ff0000</color>
<color name="color_white">#ffffff</color>
</resources>
第二步、定义style.xml文件如下：
<?xml version="1.0" encoding="utf-8"?>
<resources>
<!-- define the list items style begin -->
<style name="list_item_seperator_layout">
<item name="android:layout_width">fill_parent</item>
<item name="android:layout_height">1dip</item>
<item name="android:background">@color/color_dark_grey</item>
</style>
<style name="list_item_cell_seperator_layout">
<item name="android:layout_width">1dip</item>
<item name="android:layout_height">fill_parent</item>
<item name="android:background">@color/color_dark_grey</item>
</style>
<!-- define the list items style end -->
</resources>
第三步、定义listheader的layout文件，stock_list_header.xml如下：
<?xml version="1.0" encoding="utf-8"?>
<linearlayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="wrap_content">
<tablelayout
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:stretchcolumns="3">
<tablerow
android:id="@+id/stock_list_header_row">
<view
style="@style/list_item_cell_seperator_layout"
/>
<textview
android:id="@+id/stock_list_header_code"
android:text="@string/stock_code"
android:layout_width="60dip"
android:layout_height="wrap_content"
android:layout_gravity="center"
android:padding="2dip"
/>
<view
style="@style/list_item_cell_seperator_layout"
/>
<textview
android:id="@+id/stock_list_header_symbol"
android:text="@string/stock_symbol"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center"
android:padding="2dip"
/>
<view
style="@style/list_item_cell_seperator_layout"
/>
<textview
android:id="@+id/stock_list_header_last_price"
android:text="@string/stock_last_price"
android:layout_width="60dip"
android:layout_height="wrap_content"
android:layout_gravity="center"
android:padding="2dip"
/>
<view
style="@style/list_item_cell_seperator_layout"
/>
<textview
android:id="@+id/stock_list_header_price_change"
android:text="@string/stock_price_change"
android:layout_width="50dip"
android:layout_height="wrap_content"
android:layout_gravity="center"
android:padding="2dip"
/>
<view
style="@style/list_item_cell_seperator_layout"
/>
<textview
android:id="@+id/stock_list_header_price_change_percentage"
android:text="@string/stock_price_change_percent"
android:layout_width="50dip"
android:layout_height="wrap_content"
android:layout_gravity="center"
android:padding="2dip"
/>
<view
style="@style/list_item_cell_seperator_layout"
/>
</tablerow>
</tablelayout>
</linearlayout>
<view style="@style/list_item_cell_seperator_layout"/>是用来在每个单元格之间显示出一条垂直的分割线，使单元格之间相互分割开来。
第四步、定义listitem的布局文件，stock_list_item.xml如下：
<?xml version="1.0" encoding="utf-8"?>
<linearlayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="horizontal"
android:layout_width="fill_parent"
android:layout_height="wrap_content">
<tablelayout
android:id="@+id/stock_list_item_table_layout"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:stretchcolumns="3">
<tablerow
android:id="@+id/stock_list_row">
<view
style="@style/list_item_cell_seperator_layout"
/>
<textview
android:id="@+id/stock_code"
android:layout_width="60dip"
android:layout_height="wrap_content"
android:layout_gravity="center"
android:padding="2dip" />
<view
style="@style/list_item_cell_seperator_layout"
/>
<textview
android:id="@+id/stock_symbol"
android:layout_width="1dip"
android:layout_height="wrap_content"
android:layout_gravity="center"
android:padding="2dip"
/>
<view
style="@style/list_item_cell_seperator_layout"
/>
<textview android:id="@+id/stock_last_price"
android:layout_width="60dip"
android:layout_height="wrap_content"
android:layout_gravity="center"
android:padding="2dip"
/>
<view
style="@style/list_item_cell_seperator_layout"
/>
<textview
android:id="@+id/stock_change_price"
android:layout_width="50dip"
android:layout_height="wrap_content"
android:layout_gravity="center"
android:padding="2dip"
/>
<view
style="@style/list_item_cell_seperator_layout"
/>
<textview
android:id="@+id/stock_change_percentage"
android:layout_width="50dip"
android:layout_height="wrap_content"
android:layout_gravity="center"
android:padding="2dip"
/>
<view
style="@style/list_item_cell_seperator_layout"
/>
</tablerow>
</tablelayout>
</linearlayout>
第五步、定义stock list activity的layout文件stock_list.xml如下：
<?xml version="1.0" encoding="utf-8"?>
<linearlayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:layout_width="fill_parent"
android:layout_height="fill_parent">
<view
style="@style/list_item_seperator_layout"
/>
<include
layout="@layout/stock_list_header"
/>
<view
style="@style/list_item_seperator_layout"
/>
<listview
android:id="@+id/stock_list_view"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:scrollingcache="true"
android:cachecolorhint="#00000000"
android:fastscrollenabled="true"
android:focusable="true"
android:divider="@color/color_dark_grey"
android:dividerheight="1dip"
/>
</linearlayout>
<view style="@style/list_item_seperator_layout"/>是为了在header的上下方显示一条线来分割header和list.可能有人会问，为什么这里不直接用listview控件的header呢？
这是因为我们为了使listview在滚动过程中header始终固定在list的最上方，不会随着listview的滚动而消失。
到此为止，layout布局文件基本上定义完了，下面就是如何在代码中实现了。
stocklistactivity.java
package com.android.msoft.mfinance.ui;
import com.android.msoft.mfinance.r;
import com.android.msoft.mfinance.provider.stock;
import com.android.msoft.mfinance.provider.stockmarket.stockmarketcolumns;
import com.android.msoft.mfinance.ui.mfinancepreferenceactivity.bgcolor;
import com.android.msoft.mfinance.ui.mfinancepreferenceactivity.textsize;
import com.android.msoft.mfinance.ui.mfinancepreferenceactivity.updowncolor;
import android.app.activity;
import android.content.intent;
import android.content.sharedpreferences;
import android.database.cursor;
import android.os.bundle;
import android.preference.preferencemanager;
import android.util.log;
import android.util.typedvalue;
import android.view.menu;
import android.view.menuinflater;
import android.view.menuitem;
import android.view.windowmanager;
import android.widget.listview;
import android.widget.tablerow;
import android.widget.textview;
public class stocklistactivity extends activity {
private static final string tag = "com.android.msoft.mfinance.ui.stocklistactivity";
private sharedpreferences mpreference;
private textview mcodetextview;
private textview msymboltextview;
private textview mlastpricetextview;
private textview mpricechangetextview;
private textview mpricechangepercentagetextview;
private listview mstocklistview;
private tablerow mstocklistheader;
private float mtextsize;
private int mbgcolor;
private int mdowntextcolor;
private int muptextcolor;
private cursor mstocklistcursor;
@override
protected void oncreate(bundle savedinstancestate) {
super.oncreate(savedinstancestate);
getwindow().setflags(windowmanager.layoutparams.flag_fullscreen,
windowmanager.layoutparams.flag_fullscreen);
setcontentview(r.layout.stock_list);
mpreference = preferencemanager.getdefaultsharedpreferences(this);
refreshdisplaypreference();
mstocklistheader = (tablerow) findviewbyid(r.id.stock_list_header_row);
mcodetextview = (textview) findviewbyid(r.id.stock_list_header_code);
msymboltextview = (textview) findviewbyid(r.id.stock_list_header_symbol);
mlastpricetextview = (textview) findviewbyid(r.id.stock_list_header_last_price);
mpricechangetextview = (textview) findviewbyid(r.id.stock_list_header_price_change);
mpricechangepercentagetextview = (textview) findviewbyid(r.id.stock_list_header_price_change_percentage);
mstocklistview = (listview) findviewbyid(r.id.stock_list_view);
refreshstocklistheader();
mstocklistcursor = getcontentresolver().query(
stock.content_uri_stock_with_market, null, null, null,
stockmarketcolumns.change_price_percent + " desc");
stocklistadapter listviewadpater = new stocklistadapter(this,
mstocklistcursor);
mstocklistview.setadapter(listviewadpater);
}
@override
protected void ondestroy() {
if (!mstocklistcursor.isclosed()) {
mstocklistcursor.close();
}
super.ondestroy();
}
@override
public boolean oncreateoptionsmenu(menu menu) {
menuinflater inflater = getmenuinflater();
inflater.inflate(r.menu.stock_list_option_menu, menu);
return super.oncreateoptionsmenu(menu);
}
@override
public boolean onoptionsitemselected(menuitem item) {
switch (item.getitemid()) {
case r.id.stock_list_option_menu_settings:
intent intent = new intent(this, mfinancepreferenceactivity.class);
startactivity(intent);
break;
}
return super.onoptionsitemselected(item);
}
private void refreshdisplaypreference() {
updowncolor upanddowncolor = mfinancepreferenceactivity.updowncolor
.valueof(mpreference.getstring("up_down_color", "red_green"));
if (0 == upanddowncolor.value) { // up: red down: green
muptextcolor = getresources().getcolor(r.color.color_red);
mdowntextcolor = getresources().getcolor(r.color.color_green);
} else { // down: red up: green
muptextcolor = getresources().getcolor(r.color.color_green);
mdowntextcolor = getresources().getcolor(r.color.color_red);
}
textsize textsize = mfinancepreferenceactivity.textsize
.valueof(mpreference.getstring("text_size", "normal"));
mtextsize = typedvalue.applydimension(typedvalue.complex_unit_sp,
textsize.value, getresources().getdisplaymetrics());
int colorresid = r.color.color_black;
bgcolor bgcolor = mfinancepreferenceactivity.bgcolor
.valueof(mpreference.getstring("bg_color", "black"));
switch (bgcolor.value) {
case 0:
colorresid = r.color.color_black;
break;
case 1:
colorresid = r.color.color_white;
break;
default:
log.e(tag, "invalid bg color");
}
mbgcolor = getresources().getcolor(colorresid);
}
public float gettextsize() {
return mtextsize;
}
public int getbgcolor() {
return mbgcolor;
}
public int getuptextcolor() {
return muptextcolor;
}
public int getdowntextcolor() {
return mdowntextcolor;
}
private void refreshstocklistheader() {
mcodetextview.settextsize(mtextsize);
msymboltextview.settextsize(mtextsize);
mlastpricetextview.settextsize(mtextsize);
mpricechangetextview.settextsize(mtextsize);
mpricechangepercentagetextview.settextsize(mtextsize);
mstocklistheader.setbackgroundcolor(mbgcolor);
mstocklistview.setbackgroundcolor(mbgcolor);
}
}
stocklistadapter.java
package com.android.msoft.mfinance.ui;
import com.android.msoft.mfinance.provider.stock.stockcolumns;
import com.android.msoft.mfinance.provider.stockmarket.stockmarketcolumns;
import android.content.context;
import android.database.cursor;
import android.util.log;
import android.view.view;
import android.view.viewgroup;
import android.widget.baseadapter;
public class stocklistadapter extends baseadapter {
private static final string tag = "com.android.msoft.mfinance.ui.stocklistadapter";
private cursor mstocklistcursor;
private context mcontext;
private final int scodeindex;
private final int ssymbolindex;
private final int sboardindex;
private final int slastpriceindex;
private final int schangepriceindex;
private final int schangepricepercentindex;
public stocklistadapter(context context, cursor cursor) {
mstocklistcursor = cursor;
mcontext = context;
scodeindex = mstocklistcursor.getcolumnindex(stockcolumns.code);
ssymbolindex = mstocklistcursor.getcolumnindex(stockcolumns.symbol);
sboardindex = mstocklistcursor.getcolumnindex(stockcolumns.board);
slastpriceindex = mstocklistcursor
.getcolumnindex(stockmarketcolumns.last_price);
schangepriceindex = mstocklistcursor
.getcolumnindex(stockmarketcolumns.change_price);
schangepricepercentindex = mstocklistcursor
.getcolumnindex(stockmarketcolumns.change_price_percent);
}
@override
public int getcount() {
log.d(tag, "stock list count:" + mstocklistcursor.getcount());
return mstocklistcursor.getcount();
}
@override
public object getitem(int position) {
return null;
}
@override
public long getitemid(int position) {
return position;
}
@override
public view getview(int position, view convertview, viewgroup parent) {
stocklistitem listitem;
mstocklistcursor.movetoposition(position);
if (null == convertview) {
string code = mstocklistcursor.getstring(scodeindex);
string symbol = mstocklistcursor.getstring(ssymbolindex);
string board = mstocklistcursor.getstring(sboardindex);
float lastprice = mstocklistcursor.getfloat(slastpriceindex);
float changeprice = mstocklistcursor.getfloat(schangepriceindex);
float changepercent = mstocklistcursor
.getfloat(schangepricepercentindex);
listitem = new stocklistitem(mcontext, code, symbol, board,
lastprice, changeprice, changepercent);
} else {
listitem = (stocklistitem) convertview;
}
return listitem;
}
}
stocklistitem.java
package com.android.msoft.mfinance.ui;
import com.android.msoft.mfinance.r;
import android.content.context;
import android.view.layoutinflater;
import android.widget.linearlayout;
import android.widget.textview;
public class stocklistitem extends linearlayout {
public stocklistitem(context context, string code, string symbol,
string board, float lastprice, float changeprice,
float changepercent) {
super(context);
stocklistactivity stocklistactivity = (stocklistactivity) context;
float textsize = stocklistactivity.gettextsize();
layoutinflater factory = layoutinflater.from(context);
factory.inflate(r.layout.stock_list_item, this);
textview codetextview = (textview) findviewbyid(r.id.stock_code);
codetextview.settextsize(textsize);
codetextview.settext(code);
textview symboltextview = (textview) findviewbyid(r.id.stock_symbol);
symboltextview.settextsize(textsize);
symboltextview.settext(symbol);
textview lastpricetextview = (textview) findviewbyid(r.id.stock_last_price);
lastpricetextview.settextsize(textsize);
lastpricetextview.settext(float.tostring(lastprice));
textview changepricetextview = (textview) findviewbyid(r.id.stock_change_price);
changepricetextview.settextsize(textsize);
changepricetextview.settext(float.tostring(changeprice));
textview changepercenttextview = (textview) findviewbyid(r.id.stock_change_percentage);
changepercenttextview.settextsize(textsize);
changepercenttextview.settext(float.tostring(changepercent));
if (changeprice > 0) {
int textcolor = stocklistactivity.getuptextcolor();
// codetextview.settextcolor(textcolor);
// symboltextview.settextcolor(textcolor);
lastpricetextview.settextcolor(textcolor);
changepricetextview.settextcolor(textcolor);
changepercenttextview.settextcolor(textcolor);
}
else if (changeprice < 0)
{
int textcolor="stocklistactivity.getdowntextcolor(); codetextview.settextcolor(textcolor);
symboltextview.settextcolor(textcolor);
lastpricetextview.settextcolor(textcolor); changepricetextview.settextcolor(textcolor);
changepercenttextview.settextcolor(textcolor)
}
}
}
到此就大功告成了，这个例子我们是通过view来画线条分割各个单元格的，另外我们还可以通过定义不同的背景色，通过背景色来达到相似的效果，这个不难，就不写了。