android 通过uri截取指定大小的图片显示在imageview上

在gridview的adapter中设置

public class GridViewAdapter extends BaseAdapter {protected List<Map<String, Object>> mlist;protected Context mContext;protected LayoutInflater mInflater = null;public GridViewAdapter(Context context, List<Map<String, Object>> list) {mlist = list;mContext = context;mInflater = LayoutInflater.from(context);}@Overridepublic int getCount() {// TODO Auto-generated method stubreturn mlist.size();}@Overridepublic Object getItem(int position) {// TODO Auto-generated method stubreturn mlist.get(position);}@Overridepublic long getItemId(int position) {// TODO Auto-generated method stubreturn position;}@Overridepublic View getView(int position, View convertView, ViewGroup parent) {// TODO Auto-generated method stubViewHolder viewHolder = null;if (null == convertView) {viewHolder = new ViewHolder();convertView = mInflater.inflate(R.layout.item_gridview, null);viewHolder.imageButton = (ImageButton) convertView.findViewById(R.id.imageButton1);viewHolder.imageView = (ImageView) convertView.findViewById(R.id.imageView1);convertView.setTag(viewHolder);} else {viewHolder = (ViewHolder) convertView.getTag();}if (!mlist.get(position).get("drawable").equals("") && mlist.size() < 6) {viewHolder.imageView.setImageResource(R.drawable.app_panel_add_icon_normal);viewHolder.imageButton.setVisibility(View.GONE);} else { //自动裁剪出制定大小的图片显示在imageview上ContentResolver contentProvider = mContext.getContentResolver();Uri uri01 = (Uri)mlist.get(position).get("uri");Bitmap mBitmap = null;try {Bitmap bmp = BitmapFactory.decodeStream(contentProvider.openInputStream(uri01));mBitmap = Bitmap.createScaledBitmap(bmp, 100, 100, true);} catch (FileNotFoundException e) {// TODO Auto-generated catch blocke.printStackTrace();}viewHolder.imageView.setImageBitmap(mBitmap);//viewHolder.imageView.setImageURI((Uri) (mlist.get(position)//.get("uri")));viewHolder.imageButton.setVisibility(View.VISIBLE);}final int i = position;viewHolder.imageButton.setOnClickListener(new OnClickListener() {@Overridepublic void onClick(View v) {// TODO Auto-generated method stubif (mlist.size() == 5&& mlist.get(4).get("drawable").equals("")) {Map<String, Object> map = new HashMap<String, Object>();map.put("drawable", R.drawable.ic_launcher);mlist.add(map);}mlist.remove(i);GridViewAdapter.this.notifyDataSetChanged();}});return convertView;}static class ViewHolder {ImageView imageView;ImageButton imageButton;}}