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我有一个同步逻辑使得从android到db的sendOrder通过在doInBackgroud()上运行的web服务来运行。DoInBackground不能第二次工作
首先我启动应用程序。 然后点击SyncClick和It同步数据库没有错误。 之后，我进入应用程序添加someorder到orderTable 返回到主屏幕（其中有SyncClick），我再次点击SyncClick。 它发送命令（意思是sendOrder()功能正常） 之后，重置数据库并获得最新的数据在doInBackgroud()。 但它得到这个错误;
07-11 23:38:15.406: E/AndroidRuntime(7864): java.lang.RuntimeException: An error occured while executing doInBackground()
07-11 23:38:15.406: E/AndroidRuntime(7864): Caused by: java.lang.NullPointerException
后，我开始应用并点击SyncClick再次效果很好。所以它不工作后，我添加了一些命令，然后同步，但没有任何添加任何顺序很好。
寻找问题。 感谢您的时间提前。
public void SyncClick(View v)
{
Loading = (ImageView)findViewById(R.id.imgLoadingAnim);
LoadingLayout = (LinearLayout)findViewById(R.id.loLoadingAnim);
LoadingLayout.setVisibility(VISIBLE);
Loading.setBackgroundResource(R.drawable.loading);
frameAnimation= (AnimationDrawable)Loading.getBackground();
frameAnimation.setCallback(Loading);
frameAnimation.setVisible(true, true);
frameAnimation.start();
if(!this.dhn.isTableExists("Orders"))
{
updateDB();
}
sendOrder();
}
public void sendOrder()
{
ArrayList<Object[]> argumentsList = new ArrayList<Object[]>();
Object[] stuff = {this.dhn, this};
//SEND
ArrayList<Order> orders = this.dhn.GetOrders();
for(int i = 0 ; i < orders.size(); i++)
{
ArrayList<OrderItem> orderItems = this.dhn.GetOrderItems(orders.get(i).ID);
String orderItemsS = "";
for(int r = 0 ; r < orderItems.size(); r++)
{
orderItemsS = orderItemsS + orderItems.get(r).FinalCode + "|" + orderItems.get(r).Quantity + "|" +
orderItems.get(r).Price + "|" + orderItems.get(r).Discount + "|" + orderItems.get(r).Status + "|" + "#";
}
orderItemsS = orderItemsS.substring(0, orderItemsS.length() - 1);
Object[] arguments = {
new String("OrderAdd"),
stuff,
new String("UserId"),
new Integer (orders.get(i).UserId),
new String("int"),
new String("CustomerId"),
new Integer (orders.get(i).CustomerId),
new String("int"),
new String("Price"),
new Double (orders.get(i).Price),
new String("double"),
new String("Discount"),
new Double (orders.get(i).Discount),
new String("double"),
new String("Status"),
new Integer (orders.get(i).Status),
new String("int"),
new String("orderItems"),
new String (orderItemsS),
new String("String")
};
argumentsList.add(arguments);
}
Object[] stuffALL = {this.dhn, this, argumentsList};
Object[] argumentsALL = {
new String("recieveALL"),
stuffALL
};
//ConnectXML runXMLALL = new ConnectXML();
new ConnectXML().execute(argumentsALL);
Status = 1;
updateDB();
receive();
}
public void receive()
{
Object[] stuff = {this.dhn, this};
ArrayList<Object[]> argumentsList1 = new ArrayList<Object[]>();
//receive
Object[] arguments = {
new String("ProductListGet"),
stuff,
new String("CatID"),
new Integer (-1),
new String("int")
};
argumentsList1.add(arguments);
Object[] arguments1 = {
new String("CustomerListGet"),
stuff
};
argumentsList1.add(arguments1);
Object[] arguments2 = {
new String("CategoryListGet"),
stuff,
new String("ParentID"),
new Integer (-2),
new String("int")
};
argumentsList1.add(arguments2);
Object[] arguments3 = {
new String("UserListGet"),
stuff
};
argumentsList1.add(arguments3);
Object[] arguments5 = {
new String("ProductCategoriesListGet"),
stuff
};
argumentsList1.add(arguments5);
Object[] arguments6 = {
new String("ProductOptionListGet"),
stuff
};
argumentsList1.add(arguments6);
Object[] arguments7 = {
new String("FinalProductListGet"),
stuff
};
argumentsList1.add(arguments7);
Object[] arguments8 = {
new String("ProductDiscountsListGet"),
stuff
};
argumentsList1.add(arguments8);
Object[] arguments9 = {
new String("ProductPriceGroupListGet"),
stuff
};
argumentsList1.add(arguments9);
Object[] arguments10 = {
new String("OptionListGet"),
stuff
};
argumentsList1.add(arguments10);
Object[] stuffALL1 = {this.dhn, this, argumentsList1};
Object[] argumentsALL1 = {
new String("recieveALL"),
stuffALL1
};
//ConnectXML runXMLALL1 = new ConnectXML();
new ConnectXML().execute(argumentsALL1);
}
int Stat;
int Status;
public void LoadAnim()
{
if(Status == 1)
{
Stat++;
if(Stat > 0)
{
LoadingLayout.setVisibility(GONE);
if(frameAnimation !=null && frameAnimation.isRunning())
{
frameAnimation.stop();
Stat = 0;
Status = 0;
}
}
}
}
public void updateDB()
{
this.dhn.close();
try {
InputStream myInput;
myInput = getAssets().open("sistem.db");
// Path to the just created empty db
String outFileName = "/data/data/sistem.ss/databases/"
+ "sistem.db";
// Open the empty db as the output stream
OutputStream myOutput = new FileOutputStream(outFileName);
// transfer bytes from the inputfile to the outputfile
byte[] buffer = new byte[1024];
int length;
while ((length = myInput.read(buffer)) > 0) {
myOutput.write(buffer, 0, length);
}
// Close the streams
myOutput.flush();
myOutput.close();
myInput.close();
buffer = null;
outFileName = null;
this.dhn.close();
this.dhn = null;
this.dhn = DataHelper.getDataHelper(this);
} catch (IOException e1) {
// TODO Auto-generated catch block
e1.printStackTrace();
}
}
logcat的
07-12 07:31:59.879: E/AndroidRuntime(2873): FATAL EXCEPTION: AsyncTask #1
07-12 07:31:59.879: E/AndroidRuntime(2873): java.lang.RuntimeException: An error occured while executing doInBackground()
07-12 07:31:59.879: E/AndroidRuntime(2873): at android.os.AsyncTask$3.done(AsyncTask.java:200)
07-12 07:31:59.879: E/AndroidRuntime(2873): at java.util.concurrent.FutureTask$Sync.innerSetException(FutureTask.java:273)
07-12 07:31:59.879: E/AndroidRuntime(2873): at java.util.concurrent.FutureTask.setException(FutureTask.java:124)
07-12 07:31:59.879: E/AndroidRuntime(2873): at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:307)
07-12 07:31:59.879: E/AndroidRuntime(2873): at java.util.concurrent.FutureTask.run(FutureTask.java:137)
07-12 07:31:59.879: E/AndroidRuntime(2873): at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1068)
07-12 07:31:59.879: E/AndroidRuntime(2873): at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:561)
07-12 07:31:59.879: E/AndroidRuntime(2873): at java.lang.Thread.run(Thread.java:1096)
07-12 07:31:59.879: E/AndroidRuntime(2873): Caused by: java.lang.NullPointerException
07-12 07:31:59.879: E/AndroidRuntime(2873): at sistem.ss.ConnectXML.doInBackground(ConnectXML.java:79)
07-12 07:31:59.879: E/AndroidRuntime(2873): at sistem.ss.ConnectXML.doInBackground(ConnectXML.java:1)
07-12 07:31:59.879: E/AndroidRuntime(2873): at android.os.AsyncTask$2.call(AsyncTask.java:185)
07-12 07:31:59.879: E/AndroidRuntime(2873): at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:305)
07-12 07:31:59.879: E/AndroidRuntime(2873): ... 4 more
你可以发布整个LogCat输出吗？只是“由......引起：java.lang.NullPointerException”不足以继续。应该有一行指向您的代码中发生空指针的行。 – Eric 2012-07-11 23:21:56
你有没有考虑过使用AsycTask呢？ – BlackHatSamurai 2012-07-11 23:22:55
@Soxxeh我加了logcat .. – Mert 2012-07-12 07:10:35