[英]java.io.NotSerializableException: net.sourceforge.jtds.util.BlobBuffer$BlobInputStream
[英]Java - java.io.NotSerializableException: net.sourceforge.jtds.jdbc.JtdsConnection
我想分享一個從活動到另一個的課程。 我嘗試了一切,到處搜索,但是無法解決我的問題。 最重要的是,我必須將BusinessLogic用作整個App的控件類。 每個變量,方法都在其中。有人可以幫幫我嗎?
public void ConnectSQL() {
StrictMode.ThreadPolicy policy = new StrictMode.ThreadPolicy.Builder().permitAll().build();
StrictMode.setThreadPolicy(policy);
try {
Class.forName("net.sourceforge.jtds.jdbc.Driver");
con = DriverManager.getConnection("jdbc:jtds:sqlserver://192.168.3.10;databaseName=hungary;user=stockiduser;password=Berwin1559;loginTimeout=5;socketTimeout=5");
KapcsolatAllasKijelzes(false);
} catch (Exception e) {
KapcsolatAllasKijelzes(true);
}
}
該方法位於我的類名為BusinessLogic的類中。這是MainActivity代碼:
Intent intent=new Intent(this, Kiszedes.class);
intent.putExtra("bl",bl);
startActivity(intent);
Kiszedes.class是目標活動:
BusinessLogic bl = (BusinessLogic) getIntent().getSerializableExtra("bl");
這是LogCat所說的:
proba.diszpo E/AndroidRuntime: FATAL EXCEPTION: main
Process: proba.diszpo, PID: 11721
java.lang.RuntimeException: Parcelable encountered IOException writing serializable object (name = proba.diszpo.BusinessLogic)
at android.os.Parcel.writeSerializable(Parcel.java:1526)
at android.os.Parcel.writeValue(Parcel.java:1474)
at android.os.Parcel.writeArrayMapInternal(Parcel.java:723)
at android.os.BaseBundle.writeToParcelInner(BaseBundle.java:1408)
at android.os.Bundle.writeToParcel(Bundle.java:1133)
at android.os.Parcel.writeBundle(Parcel.java:763)
at android.content.Intent.writeToParcel(Intent.java:8660)
at android.app.ActivityManagerProxy.startActivity(ActivityManagerNative.java:3154)
at android.app.Instrumentation.execStartActivity(Instrumentation.java:1518)
at android.app.Activity.startActivityForResult(Activity.java:4226)
at android.support.v4.app.BaseFragmentActivityJB.startActivityForResult(BaseFragmentActivityJB.java:48)
at android.support.v4.app.FragmentActivity.startActivityForResult(FragmentActivity.java:77)
at android.app.Activity.startActivityForResult(Activity.java:4185)
at android.support.v4.app.FragmentActivity.startActivityForResult(FragmentActivity.java:859)
at android.app.Activity.startActivity(Activity.java:4509)
at android.app.Activity.startActivity(Activity.java:4477)
at proba.diszpo.MainActivity.onClick(MainActivity.java:177)
at android.view.View.performClick(View.java:5675)
at android.view.View$PerformClick.run(View.java:22641)
at android.os.Handler.handleCallback(Handler.java:836)
at android.os.Handler.dispatchMessage(Handler.java:103)
at android.os.Looper.loop(Looper.java:203)
at android.app.ActivityThread.main(ActivityThread.java:6251)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1063)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:924)
Caused by: java.io.NotSerializableException: net.sourceforge.jtds.jdbc.JtdsConnection
at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1224)
at java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java:1584)
at java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1549)
at java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1472)
at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1218)
at java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:346)
at android.os.Parcel.writeSerializable(Parcel.java:1521)
at android.os.Parcel.writeValue(Parcel.java:1474)
at android.os.Parcel.writeArrayMapInternal(Parcel.java:723)
at android.os.BaseBundle.writeToParcelInner(BaseBundle.java:1408)
at android.os.Bundle.writeToParcel(Bundle.java:1133)
at android.os.Parcel.writeBundle(Parcel.java:763)
at android.content.Intent.writeToParcel(Intent.java:8660)
at android.app.ActivityManagerProxy.startActivity(ActivityManagerNative.java:3154)
at android.app.Instrumentation.execStartActivity(Instrumentation.java:1518)
at android.app.Activity.startActivityForResult(Activity.java:4226)
at android.support.v4.app.BaseFragmentActivityJB.startActivityForResult(BaseFragmentActivityJB.java:48)
at android.support.v4.app.FragmentActivity.startActivityForResult(FragmentActivity.java:77)
at android.app.Activity.startActivityForResult(Activity.java:4185)
at android.support.v4.app.FragmentActivity.startActivityForResult(FragmentActivity.java:859)
at android.app.Activity.startActivity(Activity.java:4509)
at android.app.Activity.startActivity(Activity.java:4477)
at proba.diszpo.MainActivity.onClick(MainActivity.java:177)
at android.view.View.performClick(View.java:5675)
at android.view.View$PerformClick.run(View.java:22641)
at android.os.Handler.handleCallback(Handler.java:836)
at android.os.Handler.dispatchMessage(Handler.java:103)
at android.os.Looper.loop(Looper.java:203)
at android.app.ActivityThread.main(ActivityThread.java:6251)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1063)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:924)
您的BusinessLogic
類包含對JtdsConnection
對象的引用,該對象不可序列化。 僅使BusinessLogic
可Serializable
,其所有成員(以及成員的成員,等等)還不夠。 還需要可Serializable
。
由於JtdsConnection
不是您創建的類,因此無法將其設置為Serializable
。 無論如何,您嘗試進行這項工作的方式並不正確。
我建議您擁有一個業務邏輯的全局實例,這樣您就可以從任何活動/片段中訪問它。
在我的項目中,我通常使用需要的對象的static
實例創建Conf
類。 您的情況可能是這樣的:
public class Conf {
@Nullable
private static BusinessLogic businessLogic;
@NonNull
public static BusinessLogic getBusinessLogic() {
if (businessLogic == null) {
businessLogic = new BusinessLogic();
}
return businessLogic;
}
}
在您的活動中,您現在可以輕松執行以下操作: BusinessLogic bl = Conf.getBusinessLogic()
。
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