android列出目录下的所有图片

public class GalleryTestActivity extends Activity {  File photos[];  private static String TAG = "GalleryTest";     @Override     public void onCreate(Bundle savedInstanceState) {         super.onCreate(savedInstanceState);         setContentView(R.layout.main);         File f = new File("/sdcard/pics1");         photos = f.listFiles(new FilenameFilter() {      @Override    public boolean accept(File dir, String filename) {     return filename.endsWith("jpg");    }   });         String fileList = "";               for (File aFile : photos) {          fileList += aFile.getName() + "\n";         }         TextView v = (TextView)findViewById(R.id.FileList);         v.setText(fileList);         Gallery gallery = (Gallery)findViewById(R.id.Gallery);         gallery.setAdapter(new AddImgAdp(this));     }     public class AddImgAdp extends BaseAdapter {         int GalItemBg;         private Context cont;         public AddImgAdp(Context c) {             cont = c;             TypedArray typArray = obtainStyledAttributes(R.styleable.GalleryTheme);             GalItemBg = typArray.getResourceId(R.styleable.GalleryTheme_android_galleryItemBackground, 0);             typArray.recycle();         }         public int getCount() {             return photos.length;         }         public Object getItem(int position) {             return position;         }         public long getItemId(int position) {             return position;         }         public View getView(int position, View convertView, ViewGroup parent) {          ImageView imgView;          if (convertView == null)           imgView = new ImageView(cont);          else           imgView = (ImageView)convertView;             Bitmap bMap = BitmapFactory.decodeFile(filename);             imgView.setImageBitmap(bMap);             imgView.setLayoutParams(new Gallery.LayoutParams(120, 90));             imgView.setScaleType(ImageView.ScaleType.FIT_XY);             imgView.setBackgroundResource(GalItemBg);             return imgView;         }     } }

http://wang-peng1.iteye.com/blog/835426

//将sd卡的图片一张张显示出来，需要先全部加载然后在显示，如果加载一张显一张比较慢public class Pics extends Activity {private ImageView image;private String[] mFiles;private int mFilePosition = 0;private ArrayList<Bitmap> bitArray;private Bitmap b;private int i;@Overridepublic void onCreate(Bundle savedInstanceState) {    super.onCreate(savedInstanceState);    setContentView(R.layout.main);    image = (ImageView) findViewById(R.id.image);    bitArray = new ArrayList<Bitmap>();    File images = Environment            .getExternalStoragePublicDirectory(Environment.DIRECTORY_PICTURES);    try {        images.createNewFile();    } catch (IOException e) {        // TODO Auto-generated catch block        e.printStackTrace();    }    Log.e("file path", images.getAbsolutePath());    File[] imagelist = images.listFiles(new FilenameFilter() {        public boolean accept(File dir, String name) {            return ((name.endsWith(".jpg")) || (name.endsWith(".png")));        }    });    mFiles = new String[imagelist.length];    Log.e("size", imagelist.length + "");    for (int i = 0; i < imagelist.length; i++) {        mFiles[i] = imagelist[i].toString();    }    getImageFromSDCard();}public void getImageFromSDCard() {    BitmapFactory.Options options = new BitmapFactory.Options();    options.inSampleSize = 8;    try {        for (int j = 0; j < mFiles.length; j++) {            Log.d("", mFiles[mFilePosition]);            b = BitmapFactory.decodeFile(mFiles[j], null);            bitArray.add(b);        }    } catch (Exception e) {        // Log error    }}}

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