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);