Question

I have a question about an ImageAdapter for populating the GridView. Following is the code for my Activity:

public class RestListActivity extends Activity {
    //ImageButton [] buttons;
    RelativeLayout rl;
    int restCount = 0;
    //Resources a;
    int resIndex = 0;
    boolean resFound = false;
    int last;
    int resCount = 0;
    TextView tv;
    ViewFlipper vf;
    private static final int SWIPE_MIN_DISTANCE = 120;
    private static final int SWIPE_MAX_OFF_PATH = 250;
    private static final int SWIPE_THRESHOLD_VELOCITY = 200;
    private GestureDetector gestureDetector;
    View.OnTouchListener gestureListener;
    Vector<Bitmap> iconBmp;
    Vector<GridView> gvs;
    Vector<ImageAdapter> ias;

    // TODO Auto-generated constructor stub
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

        setContentView(R.layout.restlist);
        rl = (RelativeLayout) findViewById(R.id.layoutRestPage);

        //a=this.getResources();
        boolean done = true;

        tv = (TextView) findViewById(R.id.textView1);
        tv.setText("Sistemi kullandığınız için teşekkür ederiz!");

        Button nb = (Button) findViewById(R.id.nextButton);
        nb.setOnClickListener(new OnClickListener() {
            public void onClick(View view) {
                vf.setInAnimation(RestListActivity.this, R.anim.view_right_transition_in);
                vf.setOutAnimation(RestListActivity.this, R.anim.view_right_transition_out);
                vf.showNext();
            }
        });
        Button pb = (Button) findViewById(R.id.prevButton);
        pb.setOnClickListener(new OnClickListener() {
            public void onClick(View view) {
                vf.setInAnimation(RestListActivity.this, R.anim.view_left_transition_in);
                vf.setOutAnimation(RestListActivity.this, R.anim.view_left_transition_out);
                vf.showPrevious();
            }
        });
        Button backButton = (Button) findViewById(R.id.restButton);
        backButton.setOnClickListener(new OnClickListener() {
            public void onClick(View view) {
                Log.i("ACTION", "AD BUTTON CLICKED");
                try {
                    Intent i = new Intent(RestListActivity.this, AVMOrderSystemMain.class);
                    startActivity(i);
                } catch (Exception e) {
                    Log.i("cort", e.toString());
                }
            }
        });
        Button hb = (Button) findViewById(R.id.helpButton);
        hb.setOnClickListener(new OnClickListener() {

            public void onClick(View v) {
                // TODO Auto-generated method stub
                Toast.makeText(RestListActivity.this,
                        "\tSiparis vermek için bir restoran reklamına tıklayarak\n" +
                                "ilgili restoranın sayfasına gidebilir, ya da restoranlar\n" +
                                "listesinden bir restoran seçerek, yine ilgili restoranın\n" +
                                "sayfasına gidebilirsiniz.\n" +
                                "\tBu sayfadan menü tercihinizi yaparak detayları belirledikten\n" +
                                "sonra siparişinizi onaylayarak ödemeniz gereken tutarı\n" +
                                "öğrenebilirsiniz\n", Toast.LENGTH_LONG).show();
            }
        });

        gestureDetector = new GestureDetector(new MyGestureDetector());
        gestureListener = new View.OnTouchListener() {
            public boolean onTouch(View v, MotionEvent event) {
                if (gestureDetector.onTouchEvent(event)) {
                    return true;
                }
                return false;
            }
        };
        //************************************************************************************
        //************************************************************************************
        //************************************************************************************
        ias = new Vector<ImageAdapter>();
        iconBmp = new Vector<Bitmap>();
        gvs = new Vector<GridView>();
        for (int i = 0; i < StaticParameters.getCompleteData().getRestaurantsVector().size(); i++) {
            System.out.println("_______________________________________-_-_-_-" +
                    StaticParameters.getCompleteData().getRestaurantsVector().get(i).getActiveImage());
            byte[] imgBytes = FileHandler.readFile2(this, "main_icons", StaticParameters.getCompleteData().getRestaurantsVector().get(i).getActiveImage());
            iconBmp.add(BitmapFactory.decodeByteArray(imgBytes, 0, imgBytes.length));
            System.out.println("///////////////77"+imgBytes.length);
        }
        System.out.println("))))))))))))))" + iconBmp.size());
        //************************************************************************************
        vf = (ViewFlipper) findViewById(R.id.restFlipper);

        int count = iconBmp.size();
        Log.i("THE SIZE", "=" + count);

        for (int y = 0; y < iconBmp.size(); y+=6) {
            System.out.println("0000000000000000___");
            Vector<Bitmap> bmpSubSet = new Vector<Bitmap>();
            for (int o = 0; o < 6 && o + y < iconBmp.size(); o++) {
                System.out.println("INSIDE!!!!");
                bmpSubSet.add(iconBmp.get(o + y));
            }
            ImageAdapter ia = new ImageAdapter(this);
            ia.setBitmaps(bmpSubSet);
            ias.add(ia);
            GridView gv = new GridView(this);

            gv.setId(y);
            gv.setLayoutParams(new GridView.LayoutParams(800, 600));
            gv.setBackgroundColor(Color.WHITE);
            gv.setNumColumns(3);
            gv.setColumnWidth(GridView.AUTO_FIT);
            gv.setVerticalSpacing(5);
            gv.setHorizontalSpacing(5);
            gv.setStretchMode(GridView.STRETCH_COLUMN_WIDTH);

            System.out.println("++++++++++++++++4"+ia.restLogos.size());
            gv.setAdapter(ia);
            gv.setOnItemClickListener(new OnItemClickListener() {
                public void onItemClick(AdapterView<?> parent, View v, int position, long id) {
                    try {
                        /*Intent i = new Intent(RestListActivity.this,RestPageActivity.class);
                     RestPageActivity.setText(h);
                     startActivity(i);*/
                    } catch (Exception e) {
                        Log.i("cort", e.toString());
                    }
                }
            });
            vf.addView(gv);
        }

        //////////////////////////////////////////////////////

    }

    class MyGestureDetector extends SimpleOnGestureListener {
        @Override
        public boolean onFling(MotionEvent e1, MotionEvent e2, float velocityX, float velocityY) {
            try {
                if (Math.abs(e1.getY() - e2.getY()) > SWIPE_MAX_OFF_PATH)
                    return false;
                // right to left swipe
                if (e1.getX() - e2.getX() > SWIPE_MIN_DISTANCE && Math.abs(velocityX) > SWIPE_THRESHOLD_VELOCITY) {
                    vf.setInAnimation(RestListActivity.this, R.anim.view_left_transition_in);
                    vf.setOutAnimation(RestListActivity.this, R.anim.view_left_transition_out);
                    vf.showPrevious();
                } else if (e2.getX() - e1.getX() > SWIPE_MIN_DISTANCE && Math.abs(velocityX) > SWIPE_THRESHOLD_VELOCITY) {
                    vf.setInAnimation(RestListActivity.this, R.anim.view_right_transition_in);
                    vf.setOutAnimation(RestListActivity.this, R.anim.view_right_transition_out);
                    vf.showNext();
                }
            } catch (Exception e) {
                // nothing
            }
            return false;
        }
    }

    @Override
    public boolean onTouchEvent(MotionEvent event) {
        if (gestureDetector.onTouchEvent(event))
            return true;
        else
            return false;
    }
}

And the following is the ImageAdapter:

public class ImageAdapter extends BaseAdapter {
    private Context mContext;
    private ArrayList <Integer> restLogoIDs=new ArrayList<Integer>();
    private Resources res;
    Vector <Bitmap>  restLogos=new Vector<Bitmap>();
    public ImageAdapter(Context c) {
        mContext = c;
    }
    public void setResources(Resources r)
    {
        res=r;
    }
    public void setImageIDs(ArrayList <Integer> restLogoIDs)
    {
        this.restLogoIDs=restLogoIDs;
    }
    ////////////////////////////////////////////////////////
    public void setBitmaps(Vector <Bitmap> restLogos)
    {
        this.restLogos=restLogos;
        System.out.println("$$$$$$$$$$$$$$$$$$$$"+restLogos.size());
    }
    ////////////////////////////////////////////////////////
    public int getCount() {
        return restLogoIDs.size();
    }

    public Object getItem(int position) {
        return null;
    }

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

    // create a new ImageView for each item referenced by the Adapter
    public View getView(int position, View convertView, ViewGroup parent) {
        System.out.println("=============xxxxxxxxxxxxxxxxxxxxxxxxxxxxxx---"+position);
        ImageView imageView;
        if (convertView == null) {  // if it's not recycled, initialize some attributes
            imageView = new ImageView(mContext);
            imageView.setLayoutParams(new GridView.LayoutParams(180, 180));
            imageView.setScaleType(ImageView.ScaleType.CENTER_CROP);
            //imageView.setPadding(8, 8, 8, 8);
        } else {
            imageView = (ImageView) convertView;
        }

        //BURASI DEĞİŞECEK!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
        //imageView.setImageResource(restLogoIDs.get(position));
        imageView.setImageBitmap(restLogos.get(position));
        return imageView;
    }
    // references to our images
}

When I print the number of Bitmaps and the size in the adapter after I set them in the main Activity, I see that the number of Bitmaps is correct. For some reason, getView() from the adapter is not being called. I can see the GridView but it’s empty. Can I get some help with this?

Answer 1

The method getCount of your adapter returns 0 meaning, for the adapter, that it has no elements and it doesn’t call the getView method:

public int getCount() {
        return restLogoIDs.size(); // you only instantiate restLogoIds, you never add some values to it
}

Instead of restLogoIds which you never assign any values(its size is 0) use restLogos which you actually assign some values so it isn’t empty or add some values to restLogoIds when you set the adapter.