android - display image from byteArray

Question

I have a Main class with has onCreate() method. in that method i have made the MapFile class' object.and called its readFile() and readIndex() methods. in readIndex() method i call another class named MapTile where i read the images tiles from my binary file and there i have to display my image.

Question is, how can I display an image without putting my code into onCreate(Bundle savedInstanceStare) method? I am trying this way but on first line it gives me NullPointerException.

ImageView image = (ImageView) findViewById(android.R.id.icon);           
Bitmap bMap = BitmapFactory.decodeByteArray(imageTile, 0, imageTile.length);
image.setImageBitmap(bMap);

Answer 1

adding a byte array to an android imageview:

        //byte[] chartData 
        ImageView imgViewer = (ImageView) findViewById(R.id.chart_image);
        Bitmap bm = BitmapFactory.decodeByteArray(chartData, 0, chartData.length);
        DisplayMetrics dm = new DisplayMetrics();
        getWindowManager().getDefaultDisplay().getMetrics(dm);

        imgViewer.setMinimumHeight(dm.heightPixels);
        imgViewer.setMinimumWidth(dm.widthPixels);
        imgViewer.setImageBitmap(bm);