android列出目录下的所有图片

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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;
}
}
}

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//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;
@Override
public 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
}
}
}