public void onClick(View v) {
   switch (v.getId()) {
     case R.id.vp_net_photos:
       View view = findViewById(R.id.layout_net_photos);
       Animation animation = null;
       if (flag_bottom) {
         animation =
             AnimationUtils.loadAnimation(NetPhotosActivity.this, R.anim.photos_bottom_exit);
       } else {
         animation =
             AnimationUtils.loadAnimation(NetPhotosActivity.this, R.anim.photos_bottom_enter);
       }
       view.setAnimation(animation);
       flag_bottom = !flag_bottom;
       break;
     case R.id.btn_net_photos_exit:
       finish();
       break;
     case R.id.btn_net_photos_save:
       String photo = photos[viewPager.getCurrentItem()];
       FinalBitmap finalBitmap = FinalBitmap.create(NetPhotosActivity.this);
       Bitmap bitmap = finalBitmap.getBitmapFromCache(photo);
       if (bitmap != null) {
         SdCardUtil.savePhoto(NetPhotosActivity.this, bitmap);
       } else {
         ToastUtil.prompt(NetPhotosActivity.this, "还在下载大图");
       }
       break;
   }
 }