在android系统中，不同铃声存放的铃声路径：

/system/media/audio/ringtones        来电铃声
 /system/media/audio/notifications        短信通知铃声
 /system/media/audio/alarms        闹钟铃声

铃声的设置：

    import java.io.File;  
      
    import android.app.Activity;  
    import android.content.Intent;  
    import android.media.RingtoneManager;  
    import android.net.Uri;  
    import android.os.Bundle;  
    import android.view.View;  
    import android.widget.Button;  
    public class Activity01 extends Activity  
    {  
        /* 3个按钮 */  
        private Button mButtonRingtone;  
        private Button mButtonAlarm;  
        private Button mButtonNotification;  
      
        /* 自定义的类型 */  
        public static final int ButtonRingtone          = 0;  
        public static final int ButtonAlarm             = 1;  
        public static final int ButtonNotification      = 2;  
        /* 铃声文件夹 */  
        private String strRingtoneFolder = "/sdcard/music/ringtones";  
        private String strAlarmFolder = "/sdcard/music/alarms";  
        private String strNotificationFolder = "/sdcard/music/notifications";  
      
      
        /** Called when the activity is first created. */  
        @Override  
        public void onCreate(Bundle savedInstanceState)  
        {  
            super.onCreate(savedInstanceState);  
            setContentView(R.layout.main);  
          
            mButtonRingtone = (Button) findViewById(R.id.ButtonRingtone);  
            mButtonAlarm = (Button) findViewById(R.id.ButtonAlarm);  
            mButtonNotification = (Button) findViewById(R.id.ButtonNotification);  
            /* 设置来电铃声 */  
            mButtonRingtone.setOnClickListener(new Button.OnClickListener()   
            {  
                @Override  
                public void onClick(View arg0)  
                {  
                    if (bFolder(strRingtoneFolder))  
                    {  
                        //打开系统铃声设置  
                        Intent intent = new Intent(RingtoneManager.ACTION_RINGTONE_PICKER);  
                        //类型为来电RINGTONE  
                        intent.putExtra(RingtoneManager.EXTRA_RINGTONE_TYPE, RingtoneManager.TYPE_RINGTONE);  
                        //设置显示的title  
                        intent.putExtra(RingtoneManager.EXTRA_RINGTONE_TITLE, "设置来电铃声");  
                        //当设置完成之后返回到当前的Activity  
                        startActivityForResult(intent, ButtonRingtone);  
                    }  
                }  
            });  
            /* 设置闹钟铃声 */  
            mButtonAlarm.setOnClickListener(new Button.OnClickListener()   
            {  
                @Override  
                public void onClick(View arg0)  
                {  
                    if (bFolder(strAlarmFolder))  
                    {  
                        //打开系统铃声设置  
                        Intent intent = new Intent(RingtoneManager.ACTION_RINGTONE_PICKER);  
                        //设置铃声类型和title  
                        intent.putExtra(RingtoneManager.EXTRA_RINGTONE_TYPE, RingtoneManager.TYPE_ALARM);  
                        intent.putExtra(RingtoneManager.EXTRA_RINGTONE_TITLE, "设置闹铃铃声");  
                        //当设置完成之后返回到当前的Activity  
                        startActivityForResult(intent, ButtonAlarm);  
                    }  
                }  
            });  
            /* 设置通知铃声 */  
            mButtonNotification.setOnClickListener(new Button.OnClickListener()   
            {  
                @Override  
                public void onClick(View arg0)  
                {  
                    if (bFolder(strNotificationFolder))  
                    {  
                        //打开系统铃声设置  
                        Intent intent = new Intent(RingtoneManager.ACTION_RINGTONE_PICKER);  
                        //设置铃声类型和title  
                        intent.putExtra(RingtoneManager.EXTRA_RINGTONE_TYPE, RingtoneManager.TYPE_NOTIFICATION);  
                        intent.putExtra(RingtoneManager.EXTRA_RINGTONE_TITLE, "设置通知铃声");  
                        //当设置完成之后返回到当前的Activity  
                        startActivityForResult(intent, ButtonNotification);  
                    }  
                }  
            });  
        }  
        /* 当设置铃声之后的回调函数 */  
        @Override  
        protected void onActivityResult(int requestCode, int resultCode, Intent data)  
        {  
            // TODO Auto-generated method stub  
            if (resultCode != RESULT_OK)  
            {  
                return;  
            }  
            switch (requestCode)  
            {  
                case ButtonRingtone:  
                    try  
                    {  
                        //得到我们选择的铃声  
                        Uri pickedUri = data.getParcelableExtra(RingtoneManager.EXTRA_RINGTONE_PICKED_URI);  
                        //将我们选择的铃声设置成为默认  
                        if (pickedUri != null)  
                        {  
                            RingtoneManager.setActualDefaultRingtoneUri(Activity01.this, RingtoneManager.TYPE_RINGTONE, pickedUri);  
                        }  
                    }  
                    catch (Exception e)  
                    {  
                    }  
                    break;  
                case ButtonAlarm:  
                    try  
                    {  
                        //得到我们选择的铃声  
                        Uri pickedUri = data.getParcelableExtra(RingtoneManager.EXTRA_RINGTONE_PICKED_URI);  
                        //将我们选择的铃声设置成为默认  
                        if (pickedUri != null)  
                        {  
                            RingtoneManager.setActualDefaultRingtoneUri(Activity01.this, RingtoneManager.TYPE_ALARM, pickedUri);  
                        }  
                    }  
                    catch (Exception e)  
                    {  
                    }  
                    break;  
                case ButtonNotification:  
                    try  
                    {  
                        //得到我们选择的铃声  
                        Uri pickedUri = data.getParcelableExtra(RingtoneManager.EXTRA_RINGTONE_PICKED_URI);  
                        //将我们选择的铃声设置成为默认  
                        if (pickedUri != null)  
                        {  
                            RingtoneManager.setActualDefaultRingtoneUri(Activity01.this, RingtoneManager.TYPE_NOTIFICATION, pickedUri);  
                        }  
                    }  
                    catch (Exception e)  
                    {  
                    }  
                    break;  
            }  
            super.onActivityResult(requestCode, resultCode, data);  
        }  
        //检测是否存在指定的文件夹   
        //如果不存在则创建  
        private boolean bFolder(String strFolder)  
        {  
            boolean btmp = false;  
            File f = new File(strFolder);  
            if (!f.exists())  
            {  
                if (f.mkdirs())  
                {  
                    btmp = true;  
                }  
                else  
                {  
                    btmp = false;  
                }  
            }  
            else  
            {  
                btmp = true;  
            }  
            return btmp;  
        }  
    }  


铃声的播放：

    player = new MediaPlayer();  
         try{  
         player.setDataSource(context, pickUri);  
         }catch(Exception e){  
          e.printStackTrace();  
         }  
        final AudioManager  audioManager = (AudioManager) context.getSystemService(Context.AUDIO_SERVICE);  
        if(audioManager.getStreamVolume(AudioManager.STREAM_ALARM)!=0){  
           player.setAudioStreamType(AudioManager.STREAM_ALARM);  
           player.setLooping(true);  
           try {  
        player.prepare();  
    } catch (Exception e) {  
        // TODO Auto-generated catch block  
        e.printStackTrace();  
    }  
           player.start();  
        }