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);   }     @Override   public int getCount() {    // TODO Auto-generated method stub    return mlist.size();   }     @Override   public Object getItem(int position) {    // TODO Auto-generated method stub    return mlist.get(position);   }     @Override   public long getItemId(int position) {    // TODO Auto-generated method stub    return position;   }     @Override   public View getView(int position, View convertView, ViewGroup parent) {    // TODO Auto-generated method stub    ViewHolder 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 block      e.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() {       @Override     public void onClick(View v) {      // TODO Auto-generated method stub      if (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;   }    }