傳遞一個可包含對象，其中包含一個Parcelable對象數組

Question

我想傳遞一個Parcelable對象，其中包含一個Parcelable對象數組;我的問題是，儘管第二個活動開始返回對象爲null。我所說的活性是這樣的：

i=new Intent(SoNActivity.this,OperationListAct.class); 
i.putExtra("1", opSettings); 
startActivityForResult(i, CommunicationConfig.getRequestCode(SoNActivity.class)); 

的opSetting對象是OperationSetting類的一個實例，其具有作爲屬性對象的數組：

public class OperationSetting implements Parcelable{ 
    public class OperationInfo implements Parcelable{ 
      private Operation mOperation; 
      private boolean mActive; 
      private int mPosition; 
      private String mName; 
      private String mDescription; 


      public OperationInfo(boolean isAct,int pos,String name, String descr,Operation op){ 
        mActive=isAct; 
        mPosition =pos; 
        mName=name; 
        mDescription=descr; 
        mActive=true; 
        mOperation=op; 
      } 

      public Operation getOperation(){return mOperation;} 
      public boolean getActive(){return mActive;} 
      public int getPosition(){return mPosition;} 
      public String getName(){return mName;} 
      public String getDescription(){return mDescription;} 

      public void setOperation(Operation operation){mOperation=operation;} 
      public void setActive(boolean active){mActive=active;} 
      public void setPosition(int position){mPosition=position;} 
      public void setName(String name){mName=name;} 
      public void setDescription(String description){mDescription=description;} 

      private String[] getAttList(){ 
        String[] atts={"name","description","position","isEnabled","operation"}; 
        return atts; 
      } 



      public int describeContents() { 
        return 0; 
      } 

      @Override 
      public void writeToParcel(Parcel out, int flags) { 
        Bundle bndl=new Bundle(); 
        String[] attList=this.getAttList(); 
        bndl.putString(attList[0], mName); 
        bndl.putString(attList[1],mDescription); 
        bndl.putInt(attList[2],mPosition); 
        bndl.putBoolean(attList[3], mActive); 
        bndl.putString(attList[4], mOperation.toString()); 
        out.writeBundle(bndl); 

      } 

     public OperationInfo (Parcel in) { 
      Bundle bndl = in.readBundle(); 
      String[] attList=this.getAttList(); 
      mName=bndl.getString(attList[0]); 
      mDescription=bndl.getString(attList[1]); 
      mPosition=bndl.getInt(attList[2]); 
      mActive=bndl.getBoolean(attList[3]); 
      mOperation=Operation.valueOf(bndl.getString(attList[4])); 
     } 

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

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


    } 

    private OperationInfo[] m_settings; 



    public OperationSetting (String[] namesOp,String[] descrOp,int[] positions, boolean[] enabled,boolean firstExec){ 
      Operation[] opList=Operation.values(); 
      m_settings=new OperationInfo[opList.length]; 
      for(int i=0;i<opList.length;i++){ 
        m_settings[i]=new OperationInfo(enabled[i], positions[i], namesOp[i], descrOp[i], opList[i]); 
      } 
      if(firstExec){ 
        String[] newOrder=namesOp.clone(); 
        Arrays.sort(newOrder); 
        this.sort(newOrder); 
      } 
    } 

    @Override 
    public int describeContents() { 
      return 0; 
    } 

    @Override 
    public void writeToParcel(Parcel dest, int flags) { 
      dest.writeParcelableArray(m_settings, flags); 
    } 

public OperationSetting(Parcel in) { 
    m_settings = (OperationInfo[]) in.readParcelableArray(OperationInfo.class.getClassLoader()); 

} 

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

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

最後，從收回對象第二個活動我寫道：

Bundle b=getIntent().getExtras(); 
      OperationSetting op=b.getParcelable("1"); 

第二個活動運行正常，但是當我試圖讓我得到一個java.lang.outOfMemory異常的對象;它在OperationSetting（Parcel in）方法上崩潰。它出什麼問題了？

Answer 1

我不確定是否你正在嘗試都不會起作用，因爲如果你的類實現Parcelable那麼它應該有一個靜態字段創造者，是不可能與你的模型，因爲內部類不能有靜態字段。如何將OperationInfo完全放入另一個類然後嘗試？

OutOfMemory錯誤可能是由於對OperatorSettings（in）的遞歸調用導致堆棧溢出（咯咯！）。