Android仿微信照片选择器实现预览查看图片

/** 
 * 利用ContentProvider扫描手机中的图片，此方法在运行在子线程中 完成图片的扫描，最终获得jpg最多的那个文件夹 
 */ 
 private void getImages() 
 { 
 if (!Environment.getExternalStorageState().equals( 
  Environment.MEDIA_MOUNTED)) 
 { 
  Toast.makeText(this, "暂无外部存储", Toast.LENGTH_SHORT).show(); 
  return; 
 } 
 // 显示进度条 
 mProgressDialog = ProgressDialog.show(this, null, "正在加载..."); 
 
 new Thread(new Runnable() 
 { 
  @Override 
  public void run() 
  { 
 
  String firstImage = null; 
 
  Uri mImageUri = MediaStore.Images.Media.EXTERNAL_CONTENT_URI; 
  ContentResolver mContentResolver = AlbumActivity.this 
   .getContentResolver(); 
 
  // 只查询jpeg和png的图片 
  Cursor mCursor = mContentResolver.query(mImageUri, null, 
   MediaStore.Images.Media.MIME_TYPE + "=? or " 
    + MediaStore.Images.Media.MIME_TYPE + "=?", 
   new String[] { "image/jpeg", "image/png" }, 
   MediaStore.Images.Media.DATE_MODIFIED); 
 
  Log.e("TAG", mCursor.getCount() + ""); 
  while (mCursor.moveToNext()) 
  { 
   // 获取图片的路径 
   String path = mCursor.getString(mCursor 
    .getColumnIndex(MediaStore.Images.Media.DATA)); 
 
   Log.e("TAG", path); 
   // 拿到第一张图片的路径 
   if (firstImage == null) 
   firstImage = path; 
   // 获取该图片的父路径名 
   File parentFile = new File(path).getParentFile(); 
   if (parentFile == null) 
   continue; 
   String dirPath = parentFile.getAbsolutePath(); 
   ImageFloder imageFloder = null; 
   // 利用一个HashSet防止多次扫描同一个文件夹（不加这个判断，图片多起来还是相当恐怖的~~） 
   if (mDirPaths.contains(dirPath)) 
   { 
   continue; 
   } else 
   { 
   mDirPaths.add(dirPath); 
   // 初始化imageFloder 
   imageFloder = new ImageFloder(); 
   imageFloder.setDir(dirPath); 
   imageFloder.setFirstImagePath(path); 
   } 
 
   int picSize = parentFile.list(new FilenameFilter() 
   { 
   @Override 
   public boolean accept(File dir, String filename) 
   { 
    if (filename.endsWith(".jpg") 
     || filename.endsWith(".png") 
     || filename.endsWith(".jpeg")) 
    return true; 
    return false; 
   } 
   }).length; 
   totalCount += picSize; 
 
   imageFloder.setCount(picSize); 
   mImageFloders.add(imageFloder); 
 
   if (picSize > mPicsSize) 
   { 
   mPicsSize = picSize; 
   mImgDir = parentFile; 
   } 
  } 
  mCursor.close(); 
 
  // 扫描完成，辅助的HashSet也就可以释放内存了 
  mDirPaths = null; 
 
  // 通知Handler扫描图片完成 
  mHandler.sendEmptyMessage(0x110); 
 
  } 
 }).start(); 
 
 }

private void initEvent() 
 { 
 /** 
  * 为底部的布局设置点击事件，弹出popupWindow 
  */ 
 mBottomLy.setOnClickListener(new View.OnClickListener() 
 { 
  @Override 
  public void onClick(View v) 
  { 
  mListImageDirPopupWindow 
   .setAnimationStyle(R.style.anim_popup_dir); 
  mListImageDirPopupWindow.showAsDropDown(mBottomLy, 0, 0); 
 
  // 设置背景颜色变暗 
  WindowManager.LayoutParams lp = getWindow().getAttributes(); 
  lp.alpha = .3f; 
  getWindow().setAttributes(lp); 
  } 
 }); 
 } 

//设置ImageView的点击事件 
 mImageView.setOnClickListener(new OnClickListener() 
 { 
  //选择，则将图片变暗，反之则反之 
  @Override 
  public void onClick(View v) 
  { 
 
  // 已经选择过该图片 
  if (mSelectedImage.contains(mDirPath + "/" + item)) 
  { 
   mSelectedImage.remove(mDirPath + "/" + item); 
   mSelect.setImageResource(R.drawable.picture_unselected); 
   mImageView.setColorFilter(null); 
   List<ImageBean> delete = new ArrayList<ImageBean>(); 
   for (ImageBean im:Bimp.tempSelectBitmap){ 
   if (im.getPath().equals(mDirPath + "/" + item)){ 
    delete.add(im); 
   } 
   } 
   Bimp.tempSelectBitmap.removeAll(delete); 
   Message msg = new Message(); 
   msg.what=0; 
   AlbumActivity.handler.sendMessage(msg); 
  } else 
  // 未选择该图片 
  { 
   if (Bimp.tempSelectBitmap.size()>8){ 
   Toast.makeText(context,"超出可选图片数",Toast.LENGTH_SHORT).show(); 
   return; 
   } 
   else { 
   mSelectedImage.add(mDirPath + "/" + item); 
   mSelect.setImageResource(R.drawable.pictures_selected); 
   mImageView.setColorFilter(Color.parseColor("#77000000")); 
   ImageBean imageBean = new ImageBean(); 
   imageBean.setPath(mDirPath + "/" + item); 
   try { 
    imageBean.setBitmap(Bimp.revitionImageSize(mDirPath + "/" + item)); 
   } catch (IOException e) { 
    e.printStackTrace(); 
   } 
   Bimp.tempSelectBitmap.add(imageBean); 
   Message msg = new Message(); 
   msg.what=0; 
   AlbumActivity.handler.sendMessage(msg); 
   } 
 
  } 
 
  } 

List<ImageBean> delete = new ArrayList<ImageBean>(); 
   for (ImageBean im:Bimp.tempSelectBitmap){ 
   if (im.getPath().equals(mDirPath + "/" + item)){ 
    delete.add(im); 
   } 
   } 
   Bimp.tempSelectBitmap.removeAll(delete); 
   Message msg = new Message(); 
   msg.what=0; 
   AlbumActivity.handler.sendMessage(msg); 

ImageBean imageBean = new ImageBean(); 
   imageBean.setPath(mDirPath + "/" + item); 
   try { 
    imageBean.setBitmap(Bimp.revitionImageSize(mDirPath + "/" + item)); 
   } catch (IOException e) { 
    e.printStackTrace(); 
   } 
   Bimp.tempSelectBitmap.add(imageBean); 
   Message msg = new Message(); 
   msg.what=0; 
   AlbumActivity.handler.sendMessage(msg);