我试图在gridview中显示很多图像。有两个活动。它们都有gridviews，其中有图像。当我只启动其中一个时。没有问题，但是当我启动另一个时，有“内存不足”的问题。PS：这是我第一次使用stackoverflow，我的英语很差。原谅我~.~
public class HeroGridAdapter extends BaseAdapter {
private Context mContext;
private int[] mImages;
private String[] mNames;
private String[] mShorts;
private LayoutInflater mInflater;
private LinearLayout.LayoutParams params;
private static Map<Integer,SoftReference<Bitmap>> imageCache = new HashMap<Integer,SoftReference<Bitmap>>();
public HeroGridAdapter(Context c, int[] images, String[] names,String[] shorts) {
this.mContext = c;
this.mImages = images;
this.mNames = names;
this.mShorts = shorts;
this.mInflater = LayoutInflater.from(c);
this.params = new LinearLayout.LayoutParams(45,45);
this.params.gravity = Gravity.CENTER;
}
@Override
public int getCount() {
return mImages.length;
}
@Override
public Object getItem(int position) {
return position;
}
@Override
public long getItemId(int position) {
return position;
}
@Override
public View getView(int position, View convertView, ViewGroup parent) {
ItemViewTag viewTag;
if (convertView == null) {
convertView = mInflater.inflate(R.layout.hero_portrait_grid, null);
viewTag = new ItemViewTag(
(ImageView) convertView.findViewById(R.id.ivHeroPor),
(TextView) convertView.findViewById(R.id.tvHeroPor),
(TextView) convertView.findViewById(R.id.tvHeroShort));
convertView.setTag(viewTag);
} else {
viewTag = (ItemViewTag)convertView.getTag();
}
addBitmapToCache(mImages[position]);
viewTag.name.setText(mNames[position]);
viewTag.shortName.setText(mShorts[position]);
viewTag.icon.setImageBitmap(getBitmap(mImages[position]));
return convertView;
}
class ItemViewTag {
private ImageView icon;
private TextView name;
private TextView shortName;
public ItemViewTag(ImageView icon, TextView name,TextView shortName) {
this.icon = icon;
this.name = name;
this.shortName = shortName;
}
}
public static int calculateInSampleSize(BitmapFactory.Options options,
int reqWidth, int reqHeight) {
// Raw height and width of image
final int height = options.outHeight;
final int width = options.outWidth;
int inSampleSize = 1;
if (height > reqHeight || width > reqWidth) {
// Calculate ratios of height and width to requested height and
// width
final int heightRatio = Math.round((float) height
/ (float) reqHeight);
final int widthRatio = Math.round((float) width / (float) reqWidth);
// Choose the smallest ratio as inSampleSize value, this will
// guarantee
// a final image with both dimensions larger than or equal to the
// requested height and width.
inSampleSize = heightRatio < widthRatio ? heightRatio : widthRatio;
}
return inSampleSize;
}
public static Bitmap decodeSampledBitmapFromResource(Resources res,
int resId, int reqWidth, int reqHeight) {
// First decode with inJustDecodeBounds=true to check dimensions
final BitmapFactory.Options options = new BitmapFactory.Options();
options.inJustDecodeBounds = true;
Bitmap bitmap = BitmapFactory.decodeResource(res, resId, options);
// Calculate inSampleSize
options.inSampleSize = calculateInSampleSize(options, reqWidth,
reqHeight);
// Decode bitmap with inSampleSize set
options.inJustDecodeBounds = false;
return BitmapFactory.decodeResource(res, resId, options);
}
public void addBitmapToCache(int resId){
Bitmap bitmap = decodeSampledBitmapFromResource(mContext.getResources(),
resId, 45, 45);
SoftReference<Bitmap> softBitmap = new SoftReference<Bitmap>(bitmap);
imageCache.put(resId, softBitmap);
}
public static Bitmap getBitmap(int imageKey){
SoftReference<Bitmap> softBitmap = imageCache.get(imageKey);
if(softBitmap == null){
return null;
}
Bitmap bitmap = softBitmap.get();
return bitmap;
}
}