小编Sha*_*ngh的帖子

我是Java中使用json-simple库的新手,我已经完成了编码和解码示例.复制编码示例很好,但是我无法使用混合类型JSON来解码.

我的一个问题是库中有太多的类没有正确记录,而且我没有源(为了能够阅读并理解它们的用途).因此,我很难理解如何使用这些类.

看完这个例子后:

String jsonText = "{\"first\": 123, \"second\": [4, 5, 6], \"third\": 789}";
JSONParser parser = new JSONParser();

ContainerFactory containerFactory = new ContainerFactory(){
    public List creatArrayContainer() {
        return new LinkedList();
    }

    public Map createObjectContainer() {
        return new LinkedHashMap();
    }                     
};

try {
    Map json = (Map)parser.parse(jsonText, containerFactory);
    Iterator iter = json.entrySet().iterator();
    System.out.println("==iterate result==");

    while(iter.hasNext()) {
        Map.Entry entry = (Map.Entry)iter.next();
        System.out.println(entry.getKey() + "=>" + entry.getValue());
    }

    System.out.println("==toJSONString()==");
    System.out.println(JSONValue.toJSONString(json));
} catch(ParseException pe) {
    System.out.println(pe);
}

从json简单的官方解码教程 …

我有.png图像,我res/drawable-hdpi/delete.png想将它作为图标添加到我的菜单中item.

我用了:

delete.xml

<bitmap
xmlns:android="http://schemas.android.com/apk/res/android"
android:src="@drawable/deletebutton">
</bitmap>

菜单activity_main.xml

<menu xmlns:android="http://schemas.android.com/apk/res/android" >
<item
    android:id="@+id/create"
    android:showAsAction="always"
    android:title="@string/createTask"/>
<item
    android:id="@+id/delete"
    android:showAsAction="always"
    android:icon="@drawable/delete"
    android:title="@string/deleteTask" />
</menu>

但它不起作用.

我删除了xml文件并尝试直接加载图像,这里是日志文件.

04-02 17:46:50.887: E/AndroidRuntime(11957): FATAL EXCEPTION: main
04-02 17:46:50.887: E/AndroidRuntime(11957): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.devicecontrolpanel/com.example.devicecontrolpanel.Main}: android.content.res.Resources$NotFoundException: Resource ID #0x7f020008
04-02 17:46:50.887: E/AndroidRuntime(11957):    at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2205)
04-02 17:46:50.887: E/AndroidRuntime(11957):    at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2240)
04-02 17:46:50.887: E/AndroidRuntime(11957):    at android.app.ActivityThread.access$600(ActivityThread.java:139)
04-02 17:46:50.887: E/AndroidRuntime(11957):    at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1262)
04-02 17:46:50.887: E/AndroidRuntime(11957):    at android.os.Handler.dispatchMessage(Handler.java:99)
04-02 17:46:50.887: E/AndroidRuntime(11957):    at android.os.Looper.loop(Looper.java:156)
04-02 17:46:50.887: …

我写的代码,Android这既需要Readable和Writable Database在同一时间.我收到以下错误:

05-21 13:27:47.079: E/SQLiteDatabase(8326): close() was never explicitly called on database '/data/data/com.example.devicecontrolpanel/databases/AlarmSystem' 
05-21 13:27:47.079: E/SQLiteDatabase(8326): android.database.sqlite.DatabaseObjectNotClosedException: Application did not close the cursor or database object that was opened here
05-21 13:27:47.079: E/SQLiteDatabase(8326):     at android.database.sqlite.SQLiteDatabase.<init>(SQLiteDatabase.java:2052)
05-21 13:27:47.079: E/SQLiteDatabase(8326):     at android.database.sqlite.SQLiteDatabase.openDatabase(SQLiteDatabase.java:1087)
05-21 13:27:47.079: E/SQLiteDatabase(8326):     at android.database.sqlite.SQLiteDatabase.openDatabase(SQLiteDatabase.java:1050)
05-21 13:27:47.079: E/SQLiteDatabase(8326):     at android.database.sqlite.SQLiteDatabase.openOrCreateDatabase(SQLiteDatabase.java:1136)
05-21 13:27:47.079: E/SQLiteDatabase(8326):     at android.app.ContextImpl.openOrCreateDatabase(ContextImpl.java:1041)
05-21 13:27:47.079: E/SQLiteDatabase(8326):     at android.content.ContextWrapper.openOrCreateDatabase(ContextWrapper.java:221)
05-21 13:27:47.079: E/SQLiteDatabase(8326):     at android.database.sqlite.SQLiteOpenHelper.getWritableDatabase(SQLiteOpenHelper.java:165)
05-21 13:27:47.079: E/SQLiteDatabase(8326):     at com.example.devicecontrolpanel.DataBaseAdapter.addDeviceOnSearch(DataBaseAdapter.java:215)
05-21 13:27:47.079: E/SQLiteDatabase(8326):     at …

我遇到过很多java程序,我找到了一种新的编程风格:

Class_name<...>

任何人都可以解释这是什么.？

我已经做了四span这对mouseOver动画来top:20px和mouseOut动画回top:-20px.

我写了这段代码:

    $(".pull_down").mouseover(function(){
        $(this).animate({top:'20px'});  
    });
    $(".pull_down").mouseout(function(){
        $(this).animate({top:'-20px'}); 
    });

所有span有相同的类pull_down有这个CSS style:

.pull_down
{
    -webkit-msie-transform: rotate(-90deg);
    -webkit-transform: rotate(-90deg);
    -moz-transform: rotate(-90deg);
    -o-transform: rotate(-90deg);


    background:#900;
    color:#FFF;
    font-size:20px;
    text-transform:capitalize;
    font-weight:bold;
    padding:5px;
    position:absolute;
    border:#000 solid 2px;
    border-bottom-left-radius:10px;
    padding-right:100px;
    z-index:500;
    width:100px;
}
.pull_down:hover
{
    cursor:pointer;
}

基本上这是没用的.

这里的问题是,如果鼠标超过这些元素超过1次,比如7次,那么这些动画就会排队,这看起来很尴尬

所以我想要的是当我将鼠标悬停在跨度上它开始动画时,当我切换到另一个跨度时,最后一个跨度将恢复到它的位置.

一个例子就在这里

我还阅读.stop()的相关帖子,但无法弄清楚如何做到这一点.

在最近浏览各种程序时,我看到了以下代码:

protected Object doInBackground(Object... arg0)
{
    ....
    ....
    ....
}

我不明白的意义 Object...

我从未见过...任何数据类型.