thoerup/side9/ImageAdapter.java

package dk.thoerup.side9;

import java.io.File;
import java.io.FileOutputStream;
import java.io.FilenameFilter;
import java.io.IOException;
import java.io.RandomAccessFile;
import java.util.ArrayList;
import java.util.Comparator;

import java.util.Collections;

import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.Bitmap.CompressFormat;
import android.os.Environment;
import android.util.DisplayMetrics;
import android.util.Log;
import android.view.View;
import android.view.ViewGroup;
import android.view.WindowManager;
import android.widget.BaseAdapter;
import android.widget.GridView;
import android.widget.ImageView;
import android.widget.Toast;

public class ImageAdapter extends BaseAdapter {
        final static String DIR_NAME = "/Side9";
        final static String THUMBDIR_NAME = "/.thumb/";

        //int mGalleryItemBackground;
    private Context mContext;
    
    ArrayList<ImageEntry> mImages = new ArrayList<ImageEntry>();
    
    int thumbSize;
    

    public ImageAdapter(Context c) {
        mContext = c;
        
        String path = Environment.getExternalStorageDirectory().getPath() + DIR_NAME ;
                
        
        File root = new File(path);
        
        if (root.exists() == false) {
                Toast.makeText(mContext, "Side9 folder not found on sdcard", Toast.LENGTH_LONG).show();
                return;
        } 

        File files[] = root.listFiles( new ExtensionFilter("jpg") );
                
        
        for (File f : files) {          
                ImageEntry entry = new ImageEntry();
                entry.path = f.getPath(); 

                //entry.thumb = generateAndLoadThumb(f);

                
                /* load captions */
                String infoFileName = f.getPath().replace(".jpg", ".txt");

                File infoFile = new File(infoFileName);
                if (infoFile.exists() ) { 
                        entry.caption = cleanString( getFileContent(infoFile) );
                } else {
                        entry.caption = "";
                }               
            
                mImages.add(entry);
        }
        
        Collections.sort(mImages,  new ImageEntry.PathComparator() );        
        preloadImages(0,30);
        
        thumbSize = getSize();
    }
    
    public void cleanUp() {
        mImages.clear();
    }

    
    public void preloadImages(int offset, int count) {
        final int max = mImages.size();
        
        for (int i=offset; i<(offset+count) && i<max; i++) {
                ImageEntry entry = mImages.get(i);
                
                if (entry.thumb == null) {
                        entry.thumb = generateAndLoadThumb( new File(entry.path) );
                }
        }       
    }
    
    public static Bitmap generateAndLoadThumb(File image) {
        
        File thumbDir = new File(Environment.getExternalStorageDirectory().getPath() + DIR_NAME + THUMBDIR_NAME);
        String fileName = image.getName();
        File thumb = new File ( thumbDir.getPath() + "/" + fileName );
        
        Bitmap thumbBmp = null;
        
        if (! thumbDir.exists()) {
                thumbDir.mkdirs();
        }
        
        if (! thumb.exists() || thumb.lastModified() < image.lastModified()) {
                Bitmap bmp = BitmapFactory.decodeFile( image.getPath() );
                thumbBmp =  Bitmap.createScaledBitmap(bmp, bmp.getWidth()/4, bmp.getHeight()/4, true);

                try {
                        FileOutputStream fos = new FileOutputStream(thumb);
                        thumbBmp.compress(CompressFormat.JPEG, 90, fos);   
                        fos.close();
                        
                } catch (IOException e) {
                        Log.e("Side9", "error", e);
                }
                
        } else {
                thumbBmp = BitmapFactory.decodeFile( thumb.getPath());
        }       
        return thumbBmp;
    }
    
    private void orderImages(Comparator<ImageEntry> comparator) {
        Collections.sort(mImages, comparator);
        preloadImages(0,30);
        this.notifyDataSetChanged();            
    }
    
    public void orderByPath() {
        orderImages( new ImageEntry.PathComparator());
    }
    
    public void orderByCaption() {
        orderImages(new ImageEntry.CaptionComparator());
    }
    
    @Override
    public int getCount() {
        return mImages.size();
    }

    @Override
    public Object getItem(int position) {
        return position;
    }

    @Override
    public long getItemId(int position) {
        return position;
    }
    
    public ImageEntry getImageEntry(int position) {
        return mImages.get(position);
    }
    
    public ArrayList<ImageEntry> getImages() {
        return mImages;
    }
    
    private int getSize() {
                 DisplayMetrics metrics = new DisplayMetrics();
                 WindowManager wmgr = (WindowManager) mContext.getSystemService(Context.WINDOW_SERVICE);
                 wmgr.getDefaultDisplay().getMetrics(metrics);
                 if (metrics.widthPixels < 480) {
                         return 150;
                 } else {
                         return 200;
                 }
    }

    @Override
    public View getView(int position, View convertView, ViewGroup parent) {
        
        if (position >= mImages.size()) {
                return null;
        }
        
        ImageEntry currentEntry = mImages.get(position);

        if (currentEntry.thumb == null ) {
                File thumb = new File ( currentEntry.path );
                currentEntry.thumb = generateAndLoadThumb(thumb);
        }
        
        ImageView imageView;
        if (convertView == null) {  // if it's not recycled, initialize some attributes
            imageView = new ImageView(mContext);
            imageView.setLayoutParams(new GridView.LayoutParams(thumbSize, thumbSize));
            imageView.setScaleType(ImageView.ScaleType.CENTER_CROP);
            imageView.setAdjustViewBounds(true);   
            imageView.setPadding(4, 4, 4, 4);
        } else {
            imageView = (ImageView) convertView;
        }

        //imageView.setImageURI(  Uri.parse(mThumbPaths.get(position)) );
        imageView.setImageBitmap( currentEntry.thumb );
        return imageView;
    }
    
        String getFileContent(File filename) {
                try {
                        RandomAccessFile raf = new RandomAccessFile(filename, "r");
                        int size = (int)raf.length();
                        byte buf[] = new byte[size];
                        
                        raf.readFully(buf);                     
                        raf.close();
                        
                        return new String(buf);                 
                } catch (IOException e) {
                        Log.e("Side9", "Error", e);
                        return "";
                }
        }
        
        String cleanString(String input) { //trim and remove double spaces
                String res = input.trim();
                while ( res.contains( "  ")) {
                        res = res.replace("  ", " ");
                }
                
                return res;
        }
        
        public String getItemCaption(int idx) {
                return mImages.get(idx).caption.split(" ")[0].replace(',', ' ');
        }
        
        public String getItemFilename(int idx) {
                File f = new File(mImages.get(idx).path);
                return f.getName().split("_")[0];
        }
        

    class ExtensionFilter implements FilenameFilter {
        private String mExt;
        public ExtensionFilter(String ext) {
                mExt = ext;
        }

                @Override
                public boolean accept(File dir, String filename) {
                        String parts[] = filename.split("\\.");
                        if (parts.length > 1) {
                                String ext = parts[ parts.length -1];
                                if (ext.equals(mExt)) {
                                        return true;
                                }
                        }
                        return false;
                }
        
    }
}
1	package dk.thoerup.side9;
2
3	import java.io.File;
4	import java.io.FileOutputStream;
5	import java.io.FilenameFilter;
6	import java.io.IOException;
7	import java.io.RandomAccessFile;
8	import java.util.ArrayList;
9	import java.util.Comparator;
10
11	import java.util.Collections;
12
13	import android.content.Context;
14	import android.graphics.Bitmap;
15	import android.graphics.BitmapFactory;
16	import android.graphics.Bitmap.CompressFormat;
17	import android.os.Environment;
18	import android.util.DisplayMetrics;
19	import android.util.Log;
20	import android.view.View;
21	import android.view.ViewGroup;
22	import android.view.WindowManager;
23	import android.widget.BaseAdapter;
24	import android.widget.GridView;
25	import android.widget.ImageView;
26	import android.widget.Toast;
27
28	public class ImageAdapter extends BaseAdapter {
29	final static String DIR_NAME = "/Side9";
30	final static String THUMBDIR_NAME = "/.thumb/";
31
32	//int mGalleryItemBackground;
33	private Context mContext;
34
35	ArrayList<ImageEntry> mImages = new ArrayList<ImageEntry>();
36
37	int thumbSize;
38
39
40
41	public ImageAdapter(Context c) {
42	mContext = c;
43
44	String path = Environment.getExternalStorageDirectory().getPath() + DIR_NAME ;
45
46
47	File root = new File(path);
48
49	if (root.exists() == false) {
50	Toast.makeText(mContext, "Side9 folder not found on sdcard", Toast.LENGTH_LONG).show();
51	return;
52	}
53
54	File files[] = root.listFiles( new ExtensionFilter("jpg") );
55
56
57	for (File f : files) {
58	ImageEntry entry = new ImageEntry();
59	entry.path = f.getPath();
60
61	//entry.thumb = generateAndLoadThumb(f);
62
63
64	/* load captions */
65	String infoFileName = f.getPath().replace(".jpg", ".txt");
66
67	File infoFile = new File(infoFileName);
68	if (infoFile.exists() ) {
69	entry.caption = cleanString( getFileContent(infoFile) );
70	} else {
71	entry.caption = "";
72	}
73
74	mImages.add(entry);
75	}
76
77	Collections.sort(mImages, new ImageEntry.PathComparator() );
78	preloadImages(0,30);
79
80	thumbSize = getSize();
81	}
82
83	public void cleanUp() {
84	mImages.clear();
85	}
86
87
88	public void preloadImages(int offset, int count) {
89	final int max = mImages.size();
90
91	for (int i=offset; i<(offset+count) && i<max; i++) {
92	ImageEntry entry = mImages.get(i);
93
94	if (entry.thumb == null) {
95	entry.thumb = generateAndLoadThumb( new File(entry.path) );
96	}
97	}
98	}
99
100	public static Bitmap generateAndLoadThumb(File image) {
101
102	File thumbDir = new File(Environment.getExternalStorageDirectory().getPath() + DIR_NAME + THUMBDIR_NAME);
103	String fileName = image.getName();
104	File thumb = new File ( thumbDir.getPath() + "/" + fileName );
105
106	Bitmap thumbBmp = null;
107
108	if (! thumbDir.exists()) {
109	thumbDir.mkdirs();
110	}
111
112	if (! thumb.exists() \|\| thumb.lastModified() < image.lastModified()) {
113	Bitmap bmp = BitmapFactory.decodeFile( image.getPath() );
114	thumbBmp = Bitmap.createScaledBitmap(bmp, bmp.getWidth()/4, bmp.getHeight()/4, true);
115
116	try {
117	FileOutputStream fos = new FileOutputStream(thumb);
118	thumbBmp.compress(CompressFormat.JPEG, 90, fos);
119	fos.close();
120
121	} catch (IOException e) {
122	Log.e("Side9", "error", e);
123	}
124
125	} else {
126	thumbBmp = BitmapFactory.decodeFile( thumb.getPath());
127	}
128	return thumbBmp;
129	}
130
131	private void orderImages(Comparator<ImageEntry> comparator) {
132	Collections.sort(mImages, comparator);
133	preloadImages(0,30);
134	this.notifyDataSetChanged();
135	}
136
137	public void orderByPath() {
138	orderImages( new ImageEntry.PathComparator());
139	}
140
141	public void orderByCaption() {
142	orderImages(new ImageEntry.CaptionComparator());
143	}
144
145	@Override
146	public int getCount() {
147	return mImages.size();
148	}
149
150	@Override
151	public Object getItem(int position) {
152	return position;
153	}
154
155	@Override
156	public long getItemId(int position) {
157	return position;
158	}
159
160	public ImageEntry getImageEntry(int position) {
161	return mImages.get(position);
162	}
163
164	public ArrayList<ImageEntry> getImages() {
165	return mImages;
166	}
167
168	private int getSize() {
169	DisplayMetrics metrics = new DisplayMetrics();
170	WindowManager wmgr = (WindowManager) mContext.getSystemService(Context.WINDOW_SERVICE);
171	wmgr.getDefaultDisplay().getMetrics(metrics);
172	if (metrics.widthPixels < 480) {
173	return 150;
174	} else {
175	return 200;
176	}
177	}
178
179	@Override
180	public View getView(int position, View convertView, ViewGroup parent) {
181
182	if (position >= mImages.size()) {
183	return null;
184	}
185
186	ImageEntry currentEntry = mImages.get(position);
187
188	if (currentEntry.thumb == null ) {
189	File thumb = new File ( currentEntry.path );
190	currentEntry.thumb = generateAndLoadThumb(thumb);
191	}
192
193	ImageView imageView;
194	if (convertView == null) { // if it's not recycled, initialize some attributes
195	imageView = new ImageView(mContext);
196	imageView.setLayoutParams(new GridView.LayoutParams(thumbSize, thumbSize));
197	imageView.setScaleType(ImageView.ScaleType.CENTER_CROP);
198	imageView.setAdjustViewBounds(true);
199	imageView.setPadding(4, 4, 4, 4);
200	} else {
201	imageView = (ImageView) convertView;
202	}
203
204	//imageView.setImageURI( Uri.parse(mThumbPaths.get(position)) );
205	imageView.setImageBitmap( currentEntry.thumb );
206	return imageView;
207	}
208
209	String getFileContent(File filename) {
210	try {
211	RandomAccessFile raf = new RandomAccessFile(filename, "r");
212	int size = (int)raf.length();
213	byte buf[] = new byte[size];
214
215	raf.readFully(buf);
216	raf.close();
217
218	return new String(buf);
219	} catch (IOException e) {
220	Log.e("Side9", "Error", e);
221	return "";
222	}
223	}
224
225	String cleanString(String input) { //trim and remove double spaces
226	String res = input.trim();
227	while ( res.contains( " ")) {
228	res = res.replace(" ", " ");
229	}
230
231	return res;
232	}
233
234	public String getItemCaption(int idx) {
235	return mImages.get(idx).caption.split(" ")[0].replace(',', ' ');
236	}
237
238	public String getItemFilename(int idx) {
239	File f = new File(mImages.get(idx).path);
240	return f.getName().split("_")[0];
241	}
242
243
244
245
246
247	class ExtensionFilter implements FilenameFilter {
248	private String mExt;
249	public ExtensionFilter(String ext) {
250	mExt = ext;
251	}
252
253	@Override
254	public boolean accept(File dir, String filename) {
255	String parts[] = filename.split("\\.");
256	if (parts.length > 1) {
257	String ext = parts[ parts.length -1];
258	if (ext.equals(mExt)) {
259	return true;
260	}
261	}
262	return false;
263	}
264
265	}
266	}