我正在使用音乐（最新到今天）和 ttpod 作为我的mp3播放器。
Set as ringtone ，但我没有找到一个。
I am using Music (latest up to today) and TTPOD as my MP3 players.
After Googling, I suppose I can set my MP3 ring tone, by long press on the song through Music application. However, once I long press, there are only the following selections
I was expecting I am able to get a selection choice
Set as ringtone, but I didn't find one.
May I know what is the "correct" way to set MP3 as ringtone in Android?
This isn't the "correct" way, but IMO it's a good way: use Ringdroid. With it, you can cut a suitable part of the MP3 to be used as a ringtone. This way you can get rid of those pesky intros on songs that have a slow start and save space by not having the entire MP3 duplicate in your ringtones folder.
In last versions of Android (at least in Nexus S) it's kinda hard to set MP3 as a ringtone. There was an option before in the menus called "Set As" but in the new Music app it disappeared.
What you can do is copy your mp3 to
ringtones folder might be empty or even not exist, in this case just create it.
Then you go to
Settings -> Sound -> Phone ringtone and select your mp3 from the list.
I use Ringtone Maker, which is a free app. This app allows you to select a part of your song as the ringtone. It has some preselected portions (based on popular edits included in the database), or you can select your own portion of the song to set as the ringtone.
If you simply want the beginning of the song as your ringtone, @bakytn's answer is the way to go.
Some other music apps will give you the option to choose a song as a ringtone, such as the $5 PowerAmp, but I'm not sure what they offer in terms of choosing a portion of the song.
Download MP3 music download app. Select song tab, and press the selected song. You will get option
set as ....