java - 如何排除/storage/emulated/0/Ringtones中的文件

Question

当我使用 adb 时，我找不到 /storage/emulated/0 文件夹。我基本上试图加载内部存储中的所有音频文件，但试图排除系统特定的音频，如铃声和通知音，如按键音等。我有以下代码:

String[] mediaAttrs = {
                        MediaStore.Audio.Media.TITLE,
                        MediaStore.Audio.Media.DATA,
                        MediaStore.Audio.Media.ARTIST,
                        MediaStore.Audio.Media.ALBUM,
                        MediaStore.Audio.Media.DURATION,
                        MediaStore.Audio.Media.DATE_ADDED,
                };
mCursor = context.getContentResolver().query(
              MediaStore.Audio.Media.INTERNAL_CONTENT_URI,mediaAttrs,null,null,null);

String[] excludeLocations = {"/system","/storage/emulated/0/Ringtones"};

boolean locationInclude = true;
 while(mCursor.moveToNext()){
                String mediaLocation = mCursor.getString(mediaLocationIndex);//required column index
                for(String eachLocation:excludeLocations){
                    if(mediaLocation.startsWith(eachLocation)) {
                        Log.e("LocationTest:Excluded"," "+mediaLocation);
                        locationInclude = false;
                    }
                }

                if(locationInclude){
                    Log.e("LocationTest:Included"," "+mediaLocation);
                    this.insert( ... );//insert found data
                }
                locationInclude = true;

            }

然后我使用以下内容填充 ListView :

Cursor mPlayListCursor = mDB.getWritableDB().query(
                Audio,//table name
                new String[]{"_id","mediaLocation"},
                null,null,null,null, "mediaLocation"+" ASC"
        );

SimpleCursorAdapter mAudioAdapter = new SimpleCursorAdapter(this,
                android.R.layout.simple_list_item_1,
                mCursor,
                new String[]{"mediaLocation"},
                new int[]{android.R.id.text1},0
                );  
ListView lv = findViewById(R.id.mListView);
lv.setAdapter(mAudioAdapter);  

最奇怪的是，/system下的所有音频文件都被排除了，只有两个文件:

1. /storage/emulated/0/Ringtones/hangouts_incoming_call.ogg
2. /storage/emulated/0/Ringtones/hangouts_message.ogg

总是出现在ListView中，使用adb查看时该文件夹不存在，这个文件夹是什么？它是在运行时创建的吗？那么音频是如何到达那里的呢？我该如何避免它们被填充到 ListView 中？

Answer 1

你能试试这个吗:

String selection = MediaStore.Audio.Media.ALBUM + " not like ? and " + 
MediaStore.Audio.Media.DATA +  " not like ? ";
String [] args = {"%" + "ringtones" + "%", "%" + "system/" + "%"};

Cursor mCursor = context.getContentResolver().query(MediaStore.Audio.Media.INTERNAL_CONTENT_URI,mediaAttrs,selection,args,null);

while(mCursor.moveToNext()){
       // mCursor.getColumnIndex(MediaStore.Audio.Media.ALBUM)
   String mediaLocation = mCursor.getString(1);//required column index
   Log.d("LocationTest:Excluded"," "+mediaLocation);
}