Question

我知道我不应该使用这种方法，但出于测试目的，我是。我创建了一个扩展LinearLayout并实现Serializable的类，以便能够将整个布局保存到文件中。

将视图添加到此布局后，我正在将其成功写入文件。但在回读对象时，我收到错误IllegalAcessException;有什么方法可以解决这个问题吗？

CustomLayout.class

public class CustomLayout extends LinearLayout implements Serializable{

public static final long serialVersionUID = 1000;

public LinearLayout_Serializable(Context context) {
    super(context);
}

public LinearLayout_Serializable(Context context, AttributeSet attributeset){
    super(context,attributeset);
}

}

请帮忙吗？并提前感谢

完整错误

 02-23 12:06:01.165: W/System.err(21887): java.io.InvalidClassException:  android.widget.LinearLayout; IllegalAccessException

 02-23 12:06:01.165: W/System.err(21887):   at java.io.ObjectStreamClass.resolveConstructorClass(ObjectStreamClass.java:692)

 02-23 12:06:01.165: W/System.err(21887):   at java.io.ObjectStreamClass.newInstance(ObjectStreamClass.java:653)

 02-23 12:06:01.165: W/System.err(21887):   at java.io.ObjectInputStream.readNewObject(ObjectInputStream.java:1819)

 02-23 12:06:01.165: W/System.err(21887):   at java.io.ObjectInputStream.readNonPrimitiveContent(ObjectInputStream.java:787)

 02-23 12:06:01.165: W/System.err(21887):   at java.io.ObjectInputStream.readNonPrimitiveContent(ObjectInputStream.java:787)

 02-23 12:06:01.165: W/System.err(21887):   at java.io.ObjectInputStream.readObject(ObjectInputStream.java:2006)

 02-23 12:06:01.165: W/System.err(21887):   at java.io.ObjectInputStream.readObject(ObjectInputStream.java:1963)

 02-23 12:06:01.165: W/System.err(21887):   at com.example.fastlayout.MainActivity.readFromFile(MainActivity.java:232)

 02-23 12:06:01.165: W/System.err(21887):   at com.example.fastlayout.MainActivity.onCreate(MainActivity.java:102)

 02-23 12:06:01.165: W/System.err(21887):   at android.app.Activity.performCreate(Activity.java:5372)

 02-23 12:06:01.165: W/System.err(21887):   at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1104)

 02-23 12:06:01.165: W/System.err(21887):   at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2257)

 02-23 12:06:01.165: W/System.err(21887):   at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2349)

 02-23 12:06:01.165: W/System.err(21887):   at android.app.ActivityThread.access$700(ActivityThread.java:159)

 02-23 12:06:01.165: W/System.err(21887):   at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1316)

 02-23 12:06:01.170: W/System.err(21887):   at android.os.Handler.dispatchMessage(Handler.java:99)

 02-23 12:06:01.170: W/System.err(21887):   at android.os.Looper.loop(Looper.java:176)

 02-23 12:06:01.170: W/System.err(21887):   at android.app.ActivityThread.main(ActivityThread.java:5419)

 02-23 12:06:01.170: W/System.err(21887):   at java.lang.reflect.Method.invokeNative(Native Method)

 02-23 12:06:01.170: W/System.err(21887):   at java.lang.reflect.Method.invoke(Method.java:525)

 02-23 12:06:01.170: W/System.err(21887):   at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1046)

 02-23 12:06:01.170: W/System.err(21887):   at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:862)

 02-23 12:06:01.170: W/System.err(21887):   at dalvik.system.NativeStart.main(Native Method)

Answer 1

好像他ObjectStreamClass正在寻找一个空构造函数来实例化你的自定义类。

 // Has to have an empty constructor
        if (constructor == null) {
            String className = constructorClass != null ? constructorClass.getName() : null;
            throw new InvalidClassException(className, "IllegalAccessException");
        }

LinearLayout没有空构造函数。尝试添加一个空构造函数

public LinearLayout_Serializable() {
    this(//getContextSomehow());
}

从文件中读取对象会抛出IllegalAccessException

1 个答案: