Как передать весь класс с использованием намерения

Question

Я пытаюсь передать весь объект класса другому действию с использованием намерения, но я получаю исключение из null-указателя.

Вот мой код основной деятельности

LiveData ld=list.get(arg2); 
ArrayList<LiveData> lis=new ArrayList<MainActivity.LiveData>(); 
lis.add(ld); 
Intent in=new Intent(mContext, show_data.class); 
in.putParcelableArrayListExtra("Data1", lis); 
startActivity(in); 

Это LiveData класс

class LiveData implements Parcelable 
{ 
    String file_id,time,name,file_image,file_name; 
    int tot_likes,tot_share,tot_comment,user_like; 
    Bitmap img; 
    public LiveData() { 
     // TODO Auto-generated constructor stub 
    } 
    public LiveData(Parcel in) { 
     String[] data = new String[1]; 
     in.readStringArray(data); 
    } 
    @Override 
    public int describeContents() { 
     // TODO Auto-generated method stub 
     return 0; 
    } 
    @Override 
    public void writeToParcel(Parcel dest, int flags) { 
     // TODO Auto-generated method stub 

    } 

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

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

} 

и это то, что я сочинительства во второй активности

ArrayList<LiveData> data = getIntent().getParcelableArrayListExtra("Data1"); 

и мой LogCat:

01-09 13:03:31.814: E/AndroidRuntime(9301): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.redtelephone1/com.example.redtelephone1.show_data}: java.lang.NullPointerException 
01-09 13:03:31.814: E/AndroidRuntime(9301): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2663) 
01-09 13:03:31.814: E/AndroidRuntime(9301): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2679) 
01-09 13:03:31.814: E/AndroidRuntime(9301): at android.app.ActivityThread.access$2300(ActivityThread.java:125) 
01-09 13:03:31.814: E/AndroidRuntime(9301): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:2033) 
01-09 13:03:31.814: E/AndroidRuntime(9301): at android.os.Handler.dispatchMessage(Handler.java:99) 
01-09 13:03:31.814: E/AndroidRuntime(9301): at android.os.Looper.loop(Looper.java:123) 
01-09 13:03:31.814: E/AndroidRuntime(9301): at android.app.ActivityThread.main(ActivityThread.java:4627) 
01-09 13:03:31.814: E/AndroidRuntime(9301): at java.lang.reflect.Method.invokeNative(Native Method) 
01-09 13:03:31.814: E/AndroidRuntime(9301): at java.lang.reflect.Method.invoke(Method.java:521) 
01-09 13:03:31.814: E/AndroidRuntime(9301): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:868) 
01-09 13:03:31.814: E/AndroidRuntime(9301): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:626) 
01-09 13:03:31.814: E/AndroidRuntime(9301): at dalvik.system.NativeStart.main(Native Method) 
01-09 13:03:31.814: E/AndroidRuntime(9301): Caused by: java.lang.NullPointerException 
01-09 13:03:31.814: E/AndroidRuntime(9301): at java.lang.reflect.Field.getField(Native Method) 
01-09 13:03:31.814: E/AndroidRuntime(9301): at java.lang.reflect.Field.get(Field.java:247) 
01-09 13:03:31.814: E/AndroidRuntime(9301): at android.os.Parcel.readParcelable(Parcel.java:1872) 
01-09 13:03:31.814: E/AndroidRuntime(9301): at android.os.Parcel.readValue(Parcel.java:1771) 
01-09 13:03:31.814: E/AndroidRuntime(9301): at android.os.Parcel.readListInternal(Parcel.java:2017) 
01-09 13:03:31.814: E/AndroidRuntime(9301): at android.os.Parcel.readArrayList(Parcel.java:1461) 
01-09 13:03:31.814: E/AndroidRuntime(9301): at android.os.Parcel.readValue(Parcel.java:1792) 
01-09 13:03:31.814: E/AndroidRuntime(9301): at android.os.Parcel.readMapInternal(Parcel.java:2008) 
01-09 13:03:31.814: E/AndroidRuntime(9301): at android.os.Bundle.unparcel(Bundle.java:208) 
01-09 13:03:31.814: E/AndroidRuntime(9301): at android.os.Bundle.getParcelableArrayList(Bundle.java:1144) 
01-09 13:03:31.814: E/AndroidRuntime(9301): at android.content.Intent.getParcelableArrayListExtra(Intent.java:3424) 
01-09 13:03:31.814: E/AndroidRuntime(9301): at com.example.redtelephone1.show_data.onCreate(show_data.java:25) 
01-09 13:03:31.814: E/AndroidRuntime(9301): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1047) 
01-09 13:03:31.814: E/AndroidRuntime(9301): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2627) 

Answer 1

Вы не реализуете Parceable правильно

@Override 
public void writeToParcel(Parcel dest, int flags) { 
    // TODO Auto-generated method stub 
    dest.writeString(file_id); 
    dest.writeString(name); 
//write other fields 
} 

И в конструкторе, читать значение:

public LiveData(Parcel in) { 
     file_id = in.readString(); 
     name = in.readString(); 
     //read other fields 
}