注释比较少。。。直接贴代码吧，主要有popupWindow的实现，然后通过ContentResolver便利自己手机里的所有图片，直接贴代码吧

主Activity的实现

public class MainActivity extends Activity {    private GridView id_gridView;    private TextView dir_name;    private TextView dir_pic;    private RelativeLayout bottom;    private List
    
      mImgs;    private BasePopWindow popWindow;    private ProgressDialog mProgressDialog;    private File mCurrentDir;    private int mMaxCount;    private List
     
       ListBean = new ArrayList
      
       ();    private ImageAdapter mImgAdapter;    private Handler mHandler = new Handler(){        @Override        public void handleMessage(Message msg) {           if(msg.what == 0x110)           {               mProgressDialog.dismiss();               //绑定数据到View中               data2View();               initPopWindow();           }        }    };    protected void initPopWindow()    {        popWindow = new BasePopWindow(this,ListBean);        popWindow.setOnDismissListener(new PopupWindow.OnDismissListener() {            @Override            public void onDismiss() {                lightOn();            }        });        popWindow.setOnDirSelectedListener(new BasePopWindow.OnDirSelectedListener() {            @Override            public void onSelected(Bean bean) {                mCurrentDir = new File(bean.getDir());                mImgs = Arrays.asList(mCurrentDir.list(new FilenameFilter() {                    @Override                    public boolean accept(File dir, String filename) {                        if(filename.endsWith(".jpg")                                ||filename.endsWith(".jpeg")                                ||filename.endsWith(".png"))                            return true;                        return false;                    }                }));                mImgAdapter = new ImageAdapter(MainActivity.this,mImgs,mCurrentDir.getAbsolutePath());                id_gridView.setAdapter(mImgAdapter);                dir_name.setText(bean.getName());                dir_pic.setText(mImgs.size()+"");                popWindow.dismiss();            }        });    }    //内容区域变亮    protected void lightOn()    {        WindowManager.LayoutParams lp = getWindow().getAttributes();        lp.alpha = 1.0f;        getWindow().setAttributes(lp);    }    //内容区域变暗    protected void lightOff()    {        WindowManager.LayoutParams lp = getWindow().getAttributes();        lp.alpha = 0.3f;        getWindow().setAttributes(lp);    }    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        initView();        initDatas();        initEvent();    }    protected void data2View()    {        if(mCurrentDir == null)        {            Toast.makeText(this,"未扫描到任何图片",Toast.LENGTH_SHORT).show();            return;        }        mImgs = Arrays.asList(mCurrentDir.list());        mImgAdapter = new ImageAdapter(MainActivity.this, mImgs ,mCurrentDir.getAbsolutePath());        id_gridView.setAdapter(mImgAdapter);        dir_name.setText(mMaxCount + "");        dir_pic.setText(mCurrentDir.getName());    }    private void initView()    {        id_gridView = (GridView)findViewById(R.id.id_gridView);        bottom = (RelativeLayout)findViewById(R.id.bottom);        dir_name =(TextView) findViewById(R.id.dir_name);        dir_pic = (TextView)findViewById(R.id.dir_pic);    }    private void initEvent() {        bottom.setOnClickListener(new View.OnClickListener() {            @Override            public void onClick(View v) {                popWindow.setAnimationStyle(R.style.dir_popwindow_anim);                popWindow.showAsDropDown(bottom,0,0);                lightOff();            }        });    }    //利用ContentProvider扫描手机中的所有照片    private void initDatas() {        if(!Environment.getExternalStorageState().equals(Environment.MEDIA_MOUNTED))        {            Toast.makeText(this,"当前存储卡不可用",Toast.LENGTH_SHORT).show();            return;        }        mProgressDialog = ProgressDialog.show(this,null,"正在加载");        new Thread()        {            public void run()            {                Uri mImgUri = MediaStore.Images.Media.EXTERNAL_CONTENT_URI;                ContentResolver cr = MainActivity.this.getContentResolver();                Cursor cursor;                cursor = cr.query(mImgUri, null, MediaStore.Images.Media.MIME_TYPE                        + "=? or " + MediaStore.Images.Media.MIME_TYPE                        + "=?", new String[]                        {"image/jpeg", "image/png"},                        MediaStore.Images.Media.DATE_MODIFIED);                Set
       
         mDirPaths = new HashSet
        
         ();                while(cursor.moveToNext())                {                    String path = cursor.getString(cursor.getColumnIndex(MediaStore.Images.Media.DATA));                    File parenFile = new File(path).getParentFile();                    if(parenFile == null)                        continue;                    String dirPath = parenFile.getAbsolutePath();                    Bean bean = null;                    if(mDirPaths.contains(dirPath))                    {                        continue;                    }else                    {                        mDirPaths.add(dirPath);                        bean = new Bean();                        bean.setDir(dirPath);                        bean.setFirstImgPath(path);                    }                    if(parenFile.list() == null)                        continue;                    int picSize = parenFile.list(new FilenameFilter() {                        @Override                        public boolean accept(File dir, String filename) {                            if(filename.endsWith(".jpg")||filename.endsWith(".jpeg")||filename.endsWith(".png"))                                return true;                            return false;                        }                    }).length;                    bean.setCount(picSize);                    ListBean.add(bean);                    if(picSize > mMaxCount)                    {                        mMaxCount = picSize;                        mCurrentDir = parenFile;                    }                }                cursor.close();                //扫描完成，释放临时变量的内存                //mDirPaths = null;                //通知handler扫描图片完成                mHandler.sendEmptyMessage(0x110);            }        }.start();    }}
        
       
      
     
    

自己定义的Bean类

public class Bean {    private String dir;    private  String firstImgPath;    private  String name;    private int count;    public String getDir() {        return dir;    }    public void setDir(String dir) {        this.dir = dir;        int lastIndexOf = this.dir.lastIndexOf("/");        this.name = this.dir.substring(lastIndexOf);    }    public String getFirstImgPath() {        return firstImgPath;    }    public void setFirstImgPath(String firstImgPath) {        this.firstImgPath = firstImgPath;    }    public String getName() {        return name;    }    public int getCount() {        return count;    }    public void setCount(int count) {        this.count = count;    }}

ImageAdapter类

public class ImageAdapter extends BaseAdapter{    private Set
    
      mSelectedImg = new HashSet
     
      ();    private String mDirPath;                                  //图片所在文件夹路径    private List
      
        mImgPaths = new ArrayList
       
        (); //图片名称的List集合    private LayoutInflater mInflater;    private Context mContext;    @Override    public int getCount() {        return mImgPaths.size();    }    @Override    public View getView(final int position, View convertView, ViewGroup parent) {        final ViewHolder holder;        if(convertView == null)        {            convertView = mInflater.inflate(R.layout.item,parent,false);            holder = new ViewHolder();            holder.img = (ImageView)convertView.findViewById(R.id.item_image);            holder.img_btn= (ImageButton)convertView.findViewById(R.id.item_selected);            convertView.setTag(holder);        }        else        {            holder = (ViewHolder)convertView.getTag();        }        //重置状态        holder.img.setImageResource(R.drawable.lableperson);        holder.img_btn.setImageResource(R.drawable.the1no);        holder.img.setColorFilter(null);        final String filePath = mDirPath+"/"+mImgPaths.get(position);        holder.img.setOnClickListener(new View.OnClickListener() {            @Override            public void onClick(View v) {                //已经被选择，再次点击就会被取消                if(mSelectedImg.contains(filePath))                {                    mSelectedImg.remove(filePath);                    holder.img.setColorFilter(null);                    holder.img_btn.setImageResource(R.drawable.the1no);                }else //未被选择，点击会被选择                {                    mSelectedImg.add(filePath);                    holder.img.setColorFilter(Color.parseColor("#77000000"));                    holder.img_btn.setImageResource(R.drawable.the1yes);                }               // notifyDataSetChanged();去掉解决闪屏的问题            }        });        if(mSelectedImg.contains(filePath))        {            holder.img.setColorFilter(Color.parseColor("#77000000"));            holder.img_btn.setImageResource(R.drawable.the1yes);        }        ImageLoader.getInstance(3, ImageLoader.Type.LIFO).loadImage(mDirPath+"/"+mImgPaths.get(position),holder.img);        return convertView;    }    @Override    public Object getItem(int position) {        return mImgPaths.get(position);    }    @Override    public long getItemId(int position) {        return position;    }    public ImageAdapter(Context context , List
        
          mDatas , String dirPath)    {        this.mContext=context;        this.mImgPaths=mDatas;        this.mDirPath=dirPath;        mInflater=LayoutInflater.from(context);    }    private class ViewHolder    {        public ImageView img;        public ImageButton img_btn;    }}
        
       
      
     
    

popWindow类的实现

public class BasePopWindow extends PopupWindow {    private int mWidth;    private int mHeight;    private View mConvertView;    private List
    
      mDatas;    private ListView mListView;    private Context mContext;    public interface OnDirSelectedListener    {        void onSelected(Bean bean);    }    public OnDirSelectedListener mListener;    public void setOnDirSelectedListener(OnDirSelectedListener mListener)    {        this.mListener = mListener;    }    public BasePopWindow(Context context, List
     
       datas)    {        calWidHeight(context);        mConvertView = LayoutInflater.from(context).inflate(R.layout.popwindow,null);        mDatas = datas;        setContentView(mConvertView);        setWidth(mWidth);        setHeight(mHeight);        setFocusable(true);        setTouchable(true);        setOutsideTouchable(true);        setBackgroundDrawable(new BitmapDrawable());        setTouchInterceptor(new View.OnTouchListener() {            @Override            public boolean onTouch(View v, MotionEvent event) {                if(event.getAction() == MotionEvent.ACTION_OUTSIDE)                {                    dismiss();                    return true;                }                return false;            }        });        initViews(context);        initEvents();    }    private void initViews(Context context)    {        mListView = (ListView)mConvertView.findViewById(R.id.list_pop);        mListView.setAdapter(new ListAdapter(context ,mDatas));    }    private void initEvents()    {          mListView.setOnItemClickListener(new AdapterView.OnItemClickListener() {              @Override              public void onItemClick(AdapterView
       parent, View view, int position, long id) {                  if(mListener != null)                  {                      mListener.onSelected(mDatas.get(position));                  }              }          });    }    //计算popWindow的宽度和高度    private void calWidHeight(Context context)    {        WindowManager wm = (WindowManager)context.getSystemService(Context.WINDOW_SERVICE);        DisplayMetrics outMetrics = new DisplayMetrics();        wm.getDefaultDisplay().getMetrics(outMetrics);        mWidth = outMetrics.widthPixels;        mHeight = (int)(outMetrics.heightPixels*0.7);    }    private class ListAdapter extends ArrayAdapter
      
           {        private LayoutInflater mInflater;        private List
       
         mDatas;        public ListAdapter(Context context,                           List
        
          objects) {            super(context, 0, objects);            mInflater = LayoutInflater.from(context);        }        @Override        public View getView(int position, View convertView, ViewGroup parent) {            ViewHolder holder = null;            if(convertView == null)            {                holder = new ViewHolder();                convertView = mInflater.inflate(R.layout.pop_item,parent,false);                holder.mImg = (ImageView)convertView.findViewById(R.id.item_image_pop);                holder.mDirName = (TextView)convertView.findViewById(R.id.item_name_pop);                holder.mDirCount = (TextView)convertView.findViewById(R.id.item_count_pop);                convertView.setTag(holder);            }else            {                holder = (ViewHolder)convertView.getTag();            }            Bean bean = getItem(position);            //重置            holder.mImg.setImageResource(R.drawable.the1no);            ImageLoader.getInstance().loadImage(bean.getFirstImgPath(),holder.mImg);            holder.mDirCount.setText(bean.getCount()+"");            holder.mDirName.setText(bean.getName());            return convertView;        }        private class ViewHolder        {            ImageView mImg;            TextView mDirName;            TextView mDirCount;        }    }}
        
       
      
     
    

xml文件就省略了