android 调用系统录音机拿不到返回的录音文件

调用代码如下

                                Intent intent=new Intent(MediaStore.Audio.Media.RECORD_SOUND_ACTION);
                tmpFileName=storage+getTime()+".mp3";
                intent.putExtra(MediaStore.EXTRA_OUTPUT,Uri.fromFile(new File(tmpFileName)));//放入自己的存储路径没有用，为什么照相机和录像机却可以，好像它不理会这一行
                startActivityForResult(intent,SOUND_REQUEST_CODE);

返回时代码如下，在onactivityresult中

                Uri selected = data.getData();
        String[] filePathColumn = { MediaStore.Audio.Media.DATA };
        Cursor cursor = getContentResolver().query(selected,filePathColumn, null, null, null);
        if(cursor==null)
        {
            Toast.makeText(OnePageAty.this,toastStr,Toast.LENGTH_LONG).show();
            return;
        }
        cursor.moveToFirst();
        String picturePath = cursor.getString(cursor.getColumnIndex(filePathColumn[0]));
        cursor.close();
        String dest=storage+getTime()+".mp3";
        copyTo(picturePath,dest);

得到的cursor为null，返回时的代码究竟该怎么处理？

http://download.csdn.net/detail/dongqian123/6377269