android 扫描手机内存和SD卡，获取手机的视频、音频文件。把获取不到的文件扫描出来

网上查了下android手机扫描内存或者SD卡里面的音频或者视频文件，进行显示。但是有些视频或者音频扫描不出来。有其中一个原因是当你添加了一个视频或者音频文件后，手机自身没有重新进行扫描。只有手机重启之后，手机自身才会进行扫描，才能使用传统的扫描方法扫描出视频、音频文件来。
所以可以自行添加一个扫描手机内存的方法，在扫描完之后，再使用传统的视频、音频文件获取方式获取来获取。

//扫描SD卡的文件
public void SendReceive_Scand_outside_Music(){
IntentFilter intentfilter = new IntentFilter(Intent.ACTION_MEDIA_SCANNER_FINISHED);
// intentfilter.addAction(Intent.ACTION_MEDIA_SCANNER_FINISHED);
intentfilter.addDataScheme("file");
ScanSdOutsideReceive scanSdReceiver = new ScanSdOutsideReceive();
MyApp.getInstance().registerReceiver(scanSdReceiver, intentfilter);
mContext.sendBroadcast(new Intent(Intent.ACTION_MEDIA_SCANNER_SCAN_FILE, Uri.parse("file://" + Environment.getExternalStorageDirectory())));
//        MyApp.getInstance().sendBroadcast(new Intent(Intent.ACTION_MEDIA_MOUNTED,
//       Uri.parse("file://" + Environment.getExternalStorageDirectory().getAbsolutePath())));

}

//扫描内存的文件
public void SendReceive_Scand_inside_Music(){
IntentFilter intentfilter = new IntentFilter(Intent.ACTION_MEDIA_SCANNER_FINISHED);
// intentfilter.addAction(Intent.ACTION_MEDIA_SCANNER_FINISHED);
intentfilter.addDataScheme("file");
ScanSdInsideReceive scanSdReceiver = new ScanSdInsideReceive();
MyApp.getInstance().registerReceiver(scanSdReceiver, intentfilter);
mContext.sendBroadcast(new Intent(Intent.ACTION_MEDIA_SCANNER_SCAN_FILE, Uri.parse("file://" + Environment.getDataDirectory())));
}

public class ScanSdOutsideReceive extends BroadcastReceiver{

//private AlertDialog.Builder  builder = null;
//private AlertDialog ad = null;
//    private int count1;
//    private int count2;
//    private int count;
@Override
public void onReceive(Context context, Intent intent) {
String action = intent.getAction();
if(Intent.ACTION_MEDIA_SCANNER_FINISHED.equals(action)){
//            Cursor c2 = context.getContentResolver()
//            .query(MediaStore.Audio.Media.EXTERNAL_CONTENT_URI,
//                    new String[]{MediaStore.Audio.Media.TITLE,
//                    MediaStore.Audio.Media.DURATION,
//                    MediaStore.Audio.Media.ARTIST,
//                    MediaStore.Audio.Media._ID,
//                    MediaStore.Audio.Media.DISPLAY_NAME },
//                    null, null, null);
}
}
}

public class ScanSdInsideReceive extends BroadcastReceiver{

//private AlertDialog.Builder  builder = null;
//private AlertDialog ad = null;
//    private int count1;
//    private int count2;
//    private int count;
@Override
public void onReceive(Context context, Intent intent) {
String action = intent.getAction();
if(Intent.ACTION_MEDIA_SCANNER_FINISHED.equals(action)){
//            Cursor c2 = context.getContentResolver()
//            .query(MediaStore.Audio.Media.EXTERNAL_CONTENT_URI,
//                    new String[]{MediaStore.Audio.Media.TITLE,
//                    MediaStore.Audio.Media.DURATION,
//                    MediaStore.Audio.Media.ARTIST,
//                    MediaStore.Audio.Media._ID,
//                    MediaStore.Audio.Media.DISPLAY_NAME },
//                    null, null, null);
}
}
}

ContentResolver contentResolver = mContext.getContentResolver();
Cursor cursor = contentResolver.query(MediaStore.Video.Media.EXTERNAL_CONTENT_URI, null, null, null, MediaStore.Video.Media.DEFAULT_SORT_ORDER);

//          Cursor cursor = mContext.getContentResolver().query(
//                  MediaStore.Video.Media.EXTERNAL_CONTENT_URI, null, null,
//                  null, null);
if (cursor != null) {
while (cursor.moveToNext()) {
int id = cursor.getInt(cursor
.getColumnIndexOrThrow(MediaStore.Video.Media._ID));
String title = cursor
.getString(cursor
.getColumnIndexOrThrow(MediaStore.Video.Media.TITLE));
String album = cursor
.getString(cursor
.getColumnIndexOrThrow(MediaStore.Video.Media.ALBUM));
String artist = cursor
.getString(cursor
.getColumnIndexOrThrow(MediaStore.Video.Media.ARTIST));
String displayName = cursor
.getString(cursor
.getColumnIndexOrThrow(MediaStore.Video.Media.DISPLAY_NAME));
String mimeType = cursor
.getString(cursor
.getColumnIndexOrThrow(MediaStore.Video.Media.MIME_TYPE));
String path = cursor
.getString(cursor
.getColumnIndexOrThrow(MediaStore.Video.Media.DATA));
long duration = cursor
.getInt(cursor
.getColumnIndexOrThrow(MediaStore.Video.Media.DURATION));
long size = cursor
.getLong(cursor
.getColumnIndexOrThrow(MediaStore.Video.Media.SIZE));

}
}

}
cursor.close();
}

// ContentProvider（内容提供者） 和 ContentResolver（内容解析器），用于管理和发布和应用程序相关的持久性数据
ContentResolver resolver = mContext.getContentResolver();
//  String[] projection = new String[]{MediaStore.Video.Media.TITLE};
Cursor cursor = resolver.query(
MediaStore.Audio.Media.EXTERNAL_CONTENT_URI, null, null, null,
MediaStore.Audio.Media.DEFAULT_SORT_ORDER);
if (null == cursor) {
return null;
}
cursor.moveToFirst();
if (cursor.moveToFirst()) {
do {
RingItem m = new RingItem();
//自己建的类，用于存放查询到的音乐信息
//播放音乐是用的是创建MediaPlayer实例，为其传递音乐文件的路径
long id = 0;
String title = null;
String arrtist = null ;
String album=null;
long size=0;
long duration=0;
String url =null;
String name=null;
if(cursor.getColumnIndex(MediaStore.Audio.Media._ID)!=-1)
id = cursor.getLong(cursor .getColumnIndex(MediaStore.Audio.Media._ID));        //音乐id
if(cursor.getColumnIndex(MediaStore.Audio.Media.TITLE)!=-1)
title = cursor.getString(cursor.getColumnIndex(MediaStore.Audio.Media.TITLE)); // 标题
if(cursor.getColumnIndex(MediaStore.Audio.Media.ARTIST)!=-1)
arrtist = cursor.getString(cursor .getColumnIndex(MediaStore.Audio.Media.ARTIST)); // 歌手
if ("<unknown>".equals(arrtist)) {
arrtist = MyApp.getInstance().getResources().getString(R.string.unknow_artist);
}
if(cursor.getColumnIndex(MediaStore.Audio.Media.ALBUM)!=-1)
album = cursor.getString(cursor.getColumnIndex(MediaStore.Audio.Media.ALBUM)); // 专辑图片
if(cursor.getColumnIndex(MediaStore.Audio.Media.SIZE)!=-1)
size = cursor.getLong(cursor .getColumnIndex(MediaStore.Audio.Media.SIZE)); // 大小
if(cursor.getColumnIndex(MediaStore.Audio.Media.DURATION)!=-1)
duration = cursor.getLong(cursor .getColumnIndex(MediaStore.Audio.Media.DURATION)); // 时长
if(cursor.getColumnIndex(MediaStore.Audio.Media.DATA)!=-1)
url = cursor.getString(cursor .getColumnIndex(MediaStore.Audio.Media.DATA)); // 音乐文件的路径
if(cursor.getColumnIndex(MediaStore.Audio.Media.DISPLAY_NAME)!=-1)
name = cursor.getString(cursor.getColumnIndex(MediaStore.Audio.Media.DISPLAY_NAME));// 音乐文件名
if(url!=null&&duration>0){
File file = new File(url);
if (file.exists()) {

//此处添加music，音乐信息，到列表

}
}
} while (cursor.moveToNext());
}
if (cursor != null) {
//结果集移动到最后一列，再下移为空；释放资源
cursor.close();
}