Absturz beim Lesen verschachtelt Parcelable

Question

Ich habe eine Klasse, die Parcelable erweitert. Es hat eine Membervariable, die eine ArrayList einer anderen Klasse ist, die auch Parcelable erweitert.

passiere ich das MyClass1 Objekt in einer zu einer Aktion Intent zurück und lesen Sie es in Wenn der Konstruktor in.readTypedList erreicht, die App-Abstürze mit dem folgenden Fehler:.

04-11 14:19:11.223: E/AndroidRuntime(502): Uncaught handler: thread main exiting due to uncaught exception 
04-11 14:19:11.234: E/AndroidRuntime(502): java.lang.RuntimeException: Failure delivering result ResultInfo{who=null, request=0, result=-1, data=Intent { (has extras) }} to activity {com.mypackage.app/com.mypackage.app.activity.MyActivity}: java.lang.NullPointerException 
04-11 14:19:11.234: E/AndroidRuntime(502): at android.app.ActivityThread.deliverResults(ActivityThread.java:3329) 
04-11 14:19:11.234: E/AndroidRuntime(502): at android.app.ActivityThread.handleSendResult(ActivityThread.java:3371) 
04-11 14:19:11.234: E/AndroidRuntime(502): at android.app.ActivityThread.access$2700(ActivityThread.java:119) 
04-11 14:19:11.234: E/AndroidRuntime(502): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1893) 
04-11 14:19:11.234: E/AndroidRuntime(502): at android.os.Handler.dispatchMessage(Handler.java:99) 
04-11 14:19:11.234: E/AndroidRuntime(502): at android.os.Looper.loop(Looper.java:123) 
04-11 14:19:11.234: E/AndroidRuntime(502): at android.app.ActivityThread.main(ActivityThread.java:4363) 
04-11 14:19:11.234: E/AndroidRuntime(502): at java.lang.reflect.Method.invokeNative(Native Method) 
04-11 14:19:11.234: E/AndroidRuntime(502): at java.lang.reflect.Method.invoke(Method.java:521) 
04-11 14:19:11.234: E/AndroidRuntime(502): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:860) 
04-11 14:19:11.234: E/AndroidRuntime(502): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:618) 
04-11 14:19:11.234: E/AndroidRuntime(502): at dalvik.system.NativeStart.main(Native Method) 
04-11 14:19:11.234: E/AndroidRuntime(502): Caused by: java.lang.NullPointerException 
04-11 14:19:11.234: E/AndroidRuntime(502): at android.os.Parcel.readTypedList(Parcel.java:1497) 
04-11 14:19:11.234: E/AndroidRuntime(502): at com.mypackage.app.utils.Strength.<init>(Strength.java:44) 
04-11 14:19:11.234: E/AndroidRuntime(502): at com.mypackage.app.utils.Strength$1.createFromParcel(Strength.java:171) 
04-11 14:19:11.234: E/AndroidRuntime(502): at com.mypackage.app.utils.Strength$1.createFromParcel(Strength.java:1) 
04-11 14:19:11.234: E/AndroidRuntime(502): at android.os.Parcel.readParcelable(Parcel.java:1845) 
04-11 14:19:11.234: E/AndroidRuntime(502): at android.os.Parcel.readValue(Parcel.java:1713) 
04-11 14:19:11.234: E/AndroidRuntime(502): at android.os.Parcel.readMapInternal(Parcel.java:1947) 
04-11 14:19:11.234: E/AndroidRuntime(502): at android.os.Bundle.unparcel(Bundle.java:169) 
04-11 14:19:11.234: E/AndroidRuntime(502): at android.os.Bundle.containsKey(Bundle.java:210) 
04-11 14:19:11.234: E/AndroidRuntime(502): at android.content.Intent.hasExtra(Intent.java:3067) 
04-11 14:19:11.234: E/AndroidRuntime(502): at com.mypackage.app.activity.MyActivity.onActivityResult(MyActivity.java:306) 
04-11 14:19:11.234: E/AndroidRuntime(502): at android.app.Activity.dispatchActivityResult(Activity.java:3828) 
04-11 14:19:11.234: E/AndroidRuntime(502): at android.app.ActivityThread.deliverResults(ActivityThread.java:3325) 
04-11 14:19:11.234: E/AndroidRuntime(502): ... 11 more 

---

public class MyClass1 implements Parcelable { 

    private int mVar1; 
    private int mVar2; 
    private int mVar3; 
    private long mVar5; 
    private long mVar6; 
    private String mVar7; 
    private String mVar8; 
    private String mVar9; 
    private String mVar10; 
    private ArrayList<MyClass2> mVar11; 

    public MyClass1() { 
     mVar1 = -1; 
     mVar2 = -1; 
     mVar3 = -1; 
     mVar5 = 0; 
     mVar6 = 0; 
     mVar7 = null; 
     mVar8 = null; 
     mVar9 = null; 
     mVar10 = null; 
     mVar11 = new ArrayList<MyClass2>(); 
    } 

    public MyClass1(Parcel in) { 
     mVar1 = in.readInt(); 
     mVar2 = in.readInt(); 
     mVar3 = in.readInt(); 
     mVar5 = in.readLong(); 
     mVar6 = in.readLong(); 
     mVar8 = in.readString(); 
     mVar9 = in.readString(); 
     mVar10 = in.readString(); 
     in.readTypedList(mVar11, MyClass2.CREATOR); 
     mVar7 = in.readString(); 
    } 

    public int getVar1() { 
     return mVar1; 
    } 

    public void setVar1(int intVar1) { 
     this.mVar1 = intVar1; 
    } 

    public int getVar2() { 
     return mVar2; 
    } 

    public void setVar2(int intVar2) { 
     this.mVar2 = intVar2; 
    } 

    public int getVar3() { 
     return mVar3; 
    } 

    public void setVar3(int intVar3) { 
     this.mVar3 = intVar3; 
    } 

    public long getVar5() { 
     return mVar5; 
    } 

    public void setVar5(long lngVar5) { 
     this.mVar5 = lngVar5; 
    } 

    public long getVar6() { 
     return mVar6; 
    } 

    public void setVar6(long lngVar6) { 
     this.mVar6 = lngVar6; 
    } 

    public String getVar7() { 
     return mVar7; 
    } 

    public void setVar7(String strVar7) { 
     this.mVar7 = strVar7; 
    } 

    public String getVar8() { 
     return mVar8; 
    } 

    public void setVar8(String strVar8) { 
     this.mVar8 = strVar8; 
    } 

    public String getVar9() { 
     return mVar9; 
    } 

    public void setVar9(String strVar9) { 
     this.mVar9 = strVar9; 
    } 

    public String getVar10() { 
     return mVar10; 
    } 

    public void setVar10(String strVar10) { 
     this.mVar10 = strVar10; 
    } 

    public ArrayList<MyClass2> getVar11() { 
     return mVar11; 
    } 

    public void setVar11(ArrayList<MyClass2> aryVar11) { 
     this.mVar11 = aryVar11; 
    } 

    public void addVar11(MyClass2 mc2) { 
     this.mVar11.add(mc2); 
    } 

    public MyClass2 removeVar11(int index) { 
     if (index < this.mVar11.size()) { 
      return this.mVar11.remove(index); 
     } 

     return null; 
    } 

    public static final Parcelable.Creator<MyClass1> CREATOR = new Parcelable.Creator<MyClass1>() 
    { 
     public MyClass1 createFromParcel(Parcel in) { 
      return new MyClass1(in); 
     } 

     public MyClass1[] newArray (int size) { 
      return new MyClass1[size]; 
     } 
    }; 

    public int describeContents() { 
     return 0; 
    } 

    public void writeToParcel (Parcel dest, int flags) { 
     dest.writeInt(mVar1); 
     dest.writeInt(mVar2); 
     dest.writeInt(mVar3); 
     dest.writeLong(mVar5); 
     dest.writeLong(mVar6); 
     dest.writeString(mVar8); 
     dest.writeString(mVar9); 
     dest.writeString(mVar10); 
     if (mVar11 == null) { 
      mVar11 = new ArrayList<MyClass2>(); 
     } 
     dest.writeTypedList(mVar11); 
     dest.writeString(mVar7); 
    } 
} 






public class MyClass2 implements Parcelable { 

    private int mVar1; 
    private int mVar2; 
    private String mVar3; 
    private String mVar4; 

    public MyClass2() { 
     mVar1 = -1; 
     mVar2 = -1; 
     mVar3 = null; 
     mVar4 = null; 
    } 

    public MyClass2(Parcel in) { 
     mVar1 = in.readInt(); 
     mVar2 = in.readInt(); 
     mVar3 = in.readString(); 
     mVar4 = in.readString(); 
    } 

    public int getVar1() { 
     return mVar1; 
    } 

    public void setVar1(int intVar1) { 
     this.mVar1 = intVar1; 
    } 

    public int getVar2() { 
     return mVar2; 
    } 

    public void setVar2(int intVar2) { 
     this.mVar2 = intVar2; 
    } 

    public String getVar3() { 
     return mVar3; 
    } 

    public void setVar3(String strVar3) { 
     this.mVar3 = strVar3; 
    } 

    public String getVar4() { 
     return mVar4; 
    } 

    public void setVar4(String strVar4) { 
     this.mVar4 = strVar4; 
    } 

    public static final Parcelable.Creator<MyClass2> CREATOR = new Parcelable.Creator<MyClass2>() 
    { 
     public MyClass2 createFromParcel(Parcel in) { 
      return new MyClass2(in); 
     } 

     public MyClass2[] newArray (int size) { 
      return new MyClass2[size]; 
     } 
    }; 

    public int describeContents() { 
     return 0; 
    } 

    public void writeToParcel (Parcel dest, int flags) { 
     dest.writeInt(mVar1); 
     dest.writeInt(mVar2); 
     dest.writeString(mVar3); 
     dest.writeString(mVar4); 
    } 
} 

Ich habe das überkämmt und kann nichts sehen, was bedeutet, dass es wahrscheinlich etwas albernes ist, was ich nicht merke.

Ideen?

Answer 1

04-11 14:19:11.234: E/AndroidRuntime(502): Caused by: java.lang.NullPointerException 
04-11 14:19:11.234: E/AndroidRuntime(502): at android.os.Parcel.readTypedList(Parcel.java:1497) 

Werfen Sie einen Blick in den Quellcode (Parcel.java:1497):

public final <T> void readTypedList(List<T> list, Parcelable.Creator<T> c) { 
    int M = list.size(); // line 1497 
    ... ... 

Arraylist <MyClass2> mVar11 wurde vor dem Aufruf Parcel.readTypedList nicht richtig initialisiert();

public MyClass1(Parcel in) { 
    mVar1 = in.readInt(); 
    mVar2 = in.readInt(); 
    mVar3 = in.readInt(); 
    mVar5 = in.readLong(); 
    mVar6 = in.readLong(); 
    mVar8 = in.readString(); 
    mVar9 = in.readString(); 
    mVar10 = in.readString(); 
    mVar11 = new ArrayList<MyClass2>(); 
    in.readTypedList(mVar11, MyClass2.CREATOR); 
    mVar7 = in.readString(); 
} 

Dies sollte Ihren NullPointerException Fehler beheben.