CODEWITHSUNDEEP
androidarraylistbitmapparcelable
korima
korima

Reputation: 316

Parcel a List<> of custom object with Bitmaps inside

I need to pass from one Activity to other a list of news (it's a RSS reader) for to display them in a ViewPager.

All data about news is stored in a class:

public class SingleNew implements java.io.Serializable{

    public String title;
    public String link;
    public Date date;
    public Bitmap image;

}

So, as in the first activity I have already downloaded all news with images included, to avoid download again in the other activity, I decided to pass them on an Intent as parcelable object. So I created MyCustomParcelable.

public class CustomParcelable implements Parcelable {

    public List<SingleNew> news;

    public CustomParcelable(){
        news= new ArrayList<SingleNew>();
    }

    public CustomParcelable(Parcel in) {
        news= new ArrayList<SingleNew>();
        readFromParcel(in);
    }

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

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

    private void readFromParcel(Parcel in) {
        news = new ArrayList<SingleNew>();
        in.readList(news, List.class.getClassLoader());
    }

    public static final Parcelable.Creator CREATE = new Parcelable.Creator() {

         public CustomParcelable createFromParcel(Parcel parcel) {
              return new CustomParcelable(parcel);
         }

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


    };
}

When I do startActivity() my console throws this message because of Bitmaps needs a special deal.

Caused by: java.io.NotSerializableException: android.graphics.Bitmap

I know how to pass a single bitmap as a one property of my CustomParcelable object but in this case I have a List<SingleNew> that inside of each one has Bitmap so I don't know how to prepare that.

I have found other questions about bitmaps but as I said, explain how to pass as single property, not as a property of my custom object's list.

In addition I would ask if this is the best way to pass a huge amount of images. I read in other question that is more aproppiate store them in internal storage and then recover. Is it true? Or this way is correct?

Upvotes: 1

Views: 946

Answers (1)

Itzik Samara
Itzik Samara

Reputation: 2288

use byte[] instand of Bitmap

use those functions to convert between Objects

 public static byte[] convert(Bitmap bitmap) throws IOException {
            ByteArrayOutputStream stream = new ByteArrayOutputStream();
    bitmap.compress(Bitmap.CompressFormat.PNG,100,stream);
    byte[] array = stream.toByteArray();
    stream.close();
    return array;


}
public static Bitmap convert(byte[] array) {
    return BitmapFactory.decodeByteArray(array,0,array.length);
}

Upvotes: 3

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