Bilder von Server im ListView führen zu rucklern

1public static Bitmap resizeProportionalMax(Bitmap bmp, int maxWidth , int maxHeight, Context c) {
2 if(bmp == null || bmp.getHeight() <= 0|| bmp.getWidth() <= 0) {
3 return null;
4 }
5
6
7
8 int hDiff = bmp.getHeight() - maxHeight;
9 int wDiff = bmp.getWidth() - maxWidth;
10
11 int size = (int)(((hDiff < wDiff)?maxWidth:maxHeight) * c.getResources().getDisplayMetrics().density + 0.5f);
12 float p = (float)size / (float)((hDiff < wDiff)?bmp.getWidth():bmp.getHeight());
13
14 Matrix matrix = new Matrix();
15 matrix.postScale(p, p);
16
17
18 Bitmap resizedBitmap = Bitmap.createBitmap(bmp, 0, 0, bmp.getWidth(), bmp.getHeight(), matrix, true);
19 bmp.recycle();
20
21 return resizedBitmap;
22 }

1@Override
2 public View getView(int position, View convertView, ViewGroup parent) {
3
4
5 LayoutInflater vi = ( LayoutInflater )parent.getContext().getSystemService( Context.LAYOUT_INFLATER_SERVICE );
6 convertView = vi.inflate( R.layout.lv_list_item, null );
7
8 ImageView im = ( ImageView ) convertView.findViewById( R.id.pImage );
9 TextView name = ( TextView ) convertView.findViewById( R.id.sName );
10
11 if(name != null) {
12 name.setText(itemList.get( position ).getName());
13 }
14 if(im != null) {
15 String url = itemList.get( position ).getImage();
16
17 if(url != null && url.length() > 0) {
18 getraenkeImage.setImageBitmap( PictureManipulation.resizeProportionalMax( PictureManipulation.loadBitmap( url ), this.imageMaxWidth, this.imageMaxHeight, convertView.getContext() ) );
19 }
20 }
21 return convertView;
22 }

1public static Bitmap loadBitmap(String sURL) {
2 URL newurl = null;
3 Bitmap bm = null;
4 try {
5 newurl = new URL(sURL);
6 bm = BitmapFactory.decodeStream(newurl.openConnection().getInputStream());
7 } catch (MalformedURLException e) {
8 // TODO Auto-generated catch block
9 e.printStackTrace();
10 Log.e("loadBitmap", e.getMessage());
11 } catch (IOException e) {
12 e.printStackTrace();
13 Log.e("loadBitmap", e.getMessage());
14 }
15
16 return bm;
17 }

1public class LazyImageLoader {
2
3 private Map<String, Bitmap> bitmapMap;
4 private static LazyImageLoader llm = null;
5
6 public static LazyImageLoader getInstance() {
7 if(llm == null) {
8 llm = new LazyImageLoader();
9 }
10 return llm;
11 }
12
13 private LazyImageLoader() {
14 bitmapMap = new HashMap<String, Bitmap>();
15 }
16
17 public void clearCache() {
18 this.bitmapMap.clear();
19 }
20
21
22 public Bitmap fetchBitmap(String urlString) {
23 if (bitmapMap.containsKey(urlString)) {
24 return bitmapMap.get(urlString);
25 }
26
27 try {
28
29 Bitmap bmp = BitmapFactory.decodeStream(new URL(urlString).openStream());
30
31 if (bmp != null) {
32 bitmapMap.put(urlString, bmp);
33 } else {
34 Log.w(this.getClass().getSimpleName(), "Fehler beim Abrufen des Bildes");
35 }
36
37 return bmp;
38 } catch (MalformedURLException e) {
39 Log.e(this.getClass().getSimpleName(), "fetchBitmap failed", e);
40 return null;
41 } catch (IOException e) {
42 Log.e(this.getClass().getSimpleName(), "fetchBitmap failed", e);
43 return null;
44 }
45 }
46
47 // Diese Methode wird in diesem Falle vom Adapter aus aufgerufen
48 public void fetchScaledBitmapOnThread(String urlString, ImageView imageView, int maxWidth, int maxHeight) {
49
50 FetchingHandler handler = new FetchingHandler(imageView);
51 FetchingThread thread = new FetchingThread(urlString, handler, imageView.getContext(), maxWidth, maxHeight);
52 thread.start();
53 }
54
55 public class FetchingHandler extends Handler {
56
57 private ImageView imageView;
58
59 public FetchingHandler(ImageView imageView) {
60 this.imageView = imageView;
61 }
62
63 @Override
64 public void handleMessage(Message message) {
65 if(message.obj != null)
66 imageView.setImageBitmap((Bitmap) message.obj);
67 }
68 }
69
70 public class FetchingThread extends Thread {
71
72 private String urlString;
73 private Handler handler;
74 private Context c;
75 private int maxWidth;
76 private int maxHeight;
77
78 public FetchingThread( String urlString, Handler handler, Context c, int maxWidth, int maxHeight ) {
79 this.urlString = urlString;
80 this.handler = handler;
81 this.c = c;
82 this.maxHeight = maxHeight;
83 this.maxWidth = maxWidth;
84 }
85
86 public void run() {
87
88 Bitmap bmp = fetchBitmap( urlString );
89 if(bmp != null)
90 bmp = PictureManipulation.resizeProportionalMax( bmp, maxWidth, maxHeight, c );
91 Message message = handler.obtainMessage( 1, bmp );
92 handler.sendMessage( message );
93 }
94 }
95
96}

1@Override
2 public View getView(int position, View convertView, ViewGroup parent) {
3
4 if(convertView == null) {
5 LayoutInflater vi = (LayoutInflater)parent.getContext().getSystemService(Context.LAYOUT_INFLATER_SERVICE);
6 convertView = vi.inflate(R.layout.getraenk_list_item, null);
7 }
8
9 ImageView imageView = (ImageView) convertView.findViewById(R.id.imageView);
10 TextView textViewName = (TextView) convertView.findViewById(R.id.itemName);
11
12
13 if(textViewName != null) {
14 textViewName.setText(itemList.get(position).getName());
15 }
16 if(imageView != null) {
17 if(itemList.get(position).getImage() != null && itemList.get(position).getImage().length() > 0) {
18 String url = itemList.get(position).getImage();
19 LazyImageLoader.getInstance().fetchScaledBitmapOnThread(url, imageView, this.imageMaxWidth, this.imageMaxHeight);
20 }
21
22 }
23
24 return convertView;
25 }

1LazyImageLoader.getInstance().fetchScaledBitmapOnThread(url, imageView, this.imageMaxWidth, this.imageMaxHeight);

1textViewName.setText(itemList.get(position).getName());