Question

I am new to android and I am trying to do 1 small project in it..
I am trying to get a picture from the drawable folder and cutting it into 9 pieces and storing those pieces in a bitmap array..I was able to do that..

Now, how do i retrieve those pieces from the bitmap array and display it on the imageview?

I have used a gridview in the UI to show the images…. but am not able to assign the bitmap array to the imageResource…

ok, here is what i am trying to do..

public View getView(int position, View convertView, ViewGroup parent) {
    ImageView imageView;
    Activity activity=(Activity)mContext;
    Resources res=activity.getResources();
    if (convertView == null) {  // if it's not recycled, initialize some attributes
        imageView = new ImageView(mContext);
        imageView.setLayoutParams(new GridView.LayoutParams(85, 85));
        //imageView.setScaleType(ImageView.ScaleType.CENTER_CROP);
        imageView.setPadding(8, 8, 8, 8);
    } else {
        imageView = (ImageView) convertView;
    }

    Bitmap img=BitmapFactory.decodeResource(res, R.drawable.kite);
    createBitmapPieces(img);
    imageView.setImageResource(bmp[2]);//I dont know how to set the image from the array
}

public Bitmap[] createBitmapPieces(Bitmap source){

    int k=0;
    int width=source.getWidth();
    int height=source.getHeight();
    for(int i=0;i<3;i++){
       for(int j=0;j<3;j++){
        bmp[k]=Bitmap.createBitmap(source,(width*j)/3,(i*height)/3,width/3,height/3);
        k++;
    }

    }
    return bmp;
    } 

Answer 1

You can assign only one Bitmap to an ImageView. If you want to use an array, you have to extend the ImageView class, and handle the array yourself in your custom View.

Two things you have to do:

1.) You have to create a public method for setting the Bitmap array to a new private field.

2.) You have to overwrite the onDraw(Canvas canvas) method and draw the Bitmaps in the array instead of drawing a single Drawable.

EDIT: I might have misunderstood your question, if you try to add the Bitmaps to the GridView, instead of a single ImageView, then you can do it with a custom adapter:

public class ImageAdapter extends BaseAdapter {
    private Context mContext;
    private Bitmap[] mPics;

    public ImageAdapter(Context c, Bitmap[] pics) {
        mContext = c;
        mPics = pics
    }

    public int getCount() {
        return mPics.length;
    }

    public Object getItem(int position) {
        return mPics[position];
    }

    public long getItemId(int position) {return 0;}

    public View getView(int position, View convertView, ViewGroup parent) {
        ImageView imageView;
        if (convertView == null) {  // if it's not recycled, initialize some attributes
            imageView = new ImageView(mContext);
        } else {
            imageView = (ImageView) convertView;
        }
        imageView.setImageDrawable(new BitmapDrawable(getItem(position)));
        return imageView;
    }
}

And in your Activity:

GridView grid = (GridView) findViewById(R.id.your_imageview_id);
grid.setAdapter(new ImageAdapter(this, YOUR_BITMAP_ARRAY));