解决android4.4中 Permission Denial: not allowed to send broadcast android.intent.action.MEDIA_MOUNTED

 在最近自己写的一个项目中， 遇到了这样一个问题，扫描系统SD卡中的图片文件，并按照时间进行排序，通常就是发送一个特定的广播Intent.ACTION_MEDIA_MOUNTED来通知系统执行扫描，例如 

 mContext.sendBroadcast(new Intent(Intent.ACTION_MEDIA_MOUNTED, <span style="font-family: Arial, Helvetica, sans-serif;">Uri.parse("file://" + Environment.getExternalStorageDirectory())));</span>

   这样子，就可以满足要求了， 可是最近把手机升级到了4.4.4后发现，这个方法不好使了，一执行就报错 ，错误如下  

 07-08 13:34:24.211: W/System.err(23751): Caused by: java.lang.SecurityException: Permission Denial: not allowed      to send broadcast <a href="http://lib.csdn.net/base/15" class="replace_word" title="undefined" target="_blank" style="color:#df3434; font-weight:bold;">android</a>.intent.action.MEDIA_MOUNTED from pid=23751, uid=10246

意思是没有权限发送这样的一条广播了，后来在stackoverflow中查找，发现在4.4[KK]后Intent.ACTION_MEDIA_MOUNTED这条Intent广播是受保护的，意思是只有系统应用才有权限使用广播通知系统扫描SD卡

 <protected-broadcast android:name="android.intent.action.MEDIA_MOUNTED" />

       下面给出我的解决方法：

 4.4 之前：

 private LinkedList<PictureItem> getPictureBeforeKK()
     {
         LinkedList<PictureItem> items = null;
         mContext.sendBroadcast(new Intent(Intent.ACTION_MEDIA_MOUNTED, Uri.parse("file://" + Environment.getExternalStorageDirectory())));
         Uri mImageUri = MediaStore.Images.Media.EXTERNAL_CONTENT_URI;
         ContentResolver mContentResolver = mContext.getContentResolver();
         Cursor mCursor = mContentResolver.query(mImageUri, null, null, null, MediaStore.Images.Media.DATE_ADDED);
         if (mCursor != null && mCursor.getCount() > 0)
         {
             items = new LinkedList<PictureItem>();
             mCursor.moveToFirst();
             while (mCursor.moveToNext())
             {
                 // 获取图片的路径
                 String path = mCursor.getString(mCursor.getColumnIndex(MediaStore.Images.Media.DATA));
                 // 获取图片的添加到系统的毫秒数
                 long time = mCursor.getLong(mCursor.getColumnIndex(MediaStore.Images.Media.DATE_ADDED));
                 PictureItem item = new PictureItem(path, parseTimeToYMD(time));
                 System.out.println("item = " + item);
                 items.add(item);
             }
             mCursor.close();
         }
         return items;
     }

4.4

 private LinkedList<PictureItem> getPictureInKK()
     {
          LinkedList<PictureItem> items = null;
         mContext.sendBroadcast(new Intent(Intent.ACTION_MEDIA_SCANNER_SCAN_FILE, Uri.parse("file://" + Environment.getExternalStorageDirectory())));
         Uri mImageUri = MediaStore.Images.Media.EXTERNAL_CONTENT_URI;
         ContentResolver mContentResolver = mContext.getContentResolver();
         Cursor mCursor = mContentResolver.query(mImageUri, null, null, null, MediaStore.Images.Media.DATE_ADDED);
         if (mCursor != null && mCursor.getCount() > 0)
         {
             items = new LinkedList<PictureItem>();
             mCursor.moveToFirst();
             while (mCursor.moveToNext())
             {
                 // 获取图片的路径
                 String path = mCursor.getString(mCursor.getColumnIndex(MediaStore.Images.Media.DATA));
                 // 获取图片的添加到系统的毫秒数
                 long time = mCursor.getLong(mCursor.getColumnIndex(MediaStore.Images.Media.DATE_ADDED));
                 PictureItem item = new PictureItem(path, parseTimeToYMD(time));
                 System.out.println("item = " + item);
                 items.add(item);
             }
             mCursor.close();
         }
         return items;
     }

 public String parseTimeToYMD(long time)
     {
         System.setProperty("user.timezone", "Asia/Shanghai");
         TimeZone tz = TimeZone.getTimeZone("Asia/Shanghai");
         TimeZone.setDefault(tz);
         SimpleDateFormat format = new SimpleDateFormat("yyyy年MM月dd日");
         return format.format(new Date(time * 1000L));
     }

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