Permission Denial: not allowed to send broadcast android.intent.action.MEDIA_MOUNTED

当在Android4.4上进行图片的扫描功能开发时一般会使用：sendBroadcast(new Intent(Intent.ACTION_MEDIA_MOUNTED, Uri.parse("file://"+ Environment.getExternalStorageDirectory()+ picPath)));的广播

因为Android4.4中限制了系统应用才有权限使用广播通知系统扫描SD卡，所以会抛题目异常。

解决方法：使用MediaScannerConnection执行具体文件或文件夹进行扫描，核心代码如下：

if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.KITKAT) { // 判断SDK版本是不是4.4或者高于4.4
	String[] paths = new String[]{Environment.getExternalStorageDirectory().toString()};
	MediaScannerConnection.scanFile(mContext, paths, null, null);
} else {
	final Intent intent;
	if (f.isDirectory()) {
		intent = new Intent(Intent.ACTION_MEDIA_MOUNTED);
		intent.setClassName("com.android.providers.media", "com.android.providers.media.MediaScannerReceiver");
		intent.setData(Uri.fromFile(Environment.getExternalStorageDirectory()));
		Log.v(LOG_TAG, "directory changed, send broadcast:" + intent.toString());
	} else {
		intent = new Intent(Intent.ACTION_MEDIA_SCANNER_SCAN_FILE);
		intent.setData(Uri.fromFile(new File(path)));
		Log.v(LOG_TAG, "file changed, send broadcast:" + intent.toString());
	}
	mContext.sendBroadcast(intent);
}

可参考：

http://blog.youkuaiyun.com/eoeAndroida/article/details/41806525

http://www.itstrike.cn/Question/0fd8e064-dadc-487b-be73-de6bb0e329b3.html

http://stackoverflow.com/questions/24072489/java-lang-securityexception-permission-denial-not-allowed-to-send-broadcast-an

http://www.thinksaas.cn/group/topic/219309/