最近研究源码程序，改了改手机短信铃声的源码，总结了下铃声的代码，写个activity继承PreferenceActivity有：手机短信铃声，手机铃声，闹钟铃声，还有sdcard中的铃声，通过选择相应的铃声，然后读取到xml文件里面，通过读取preference.xml文件，intent传个参数进去intent.putExtra(RingtoneManager.EXTRA_RINGTONE_EXISTING_URI, phoneUri);打开对话框的时候就默认选中上次被选中的音乐。程序流程：在onCreate（）方法中加入addPreferencesFromResource(R.xml.preferences);加载xml文件。@Override重写onPreferenceTreeClick（）方法，处理点击事件，在打开对话框铃声的时候，先读取xml文件，判断是否有值，如果有值，就传值intent.putExtra(RingtoneManager.EXTRA_RINGTONE_EXISTING_URI, phoneUri);然后进行选择铃声。通过onActivityResult（）接受传递过来的uri，系统默认的铃声是通过data.getParcelableExtra(RingtoneManager.EXTRA_RINGTONE_PICKED_URI);方法来获取uri的，而sdcard中的铃声通过Uri pickedUri = data.getData();来获得选中的uri的，再然后通过editor.commit(); 来提交接受过来的uri和音乐的名字整个流程大概就是这样。
点击此处下载源码

　　下面代码附上：

　　在SoundSettingActivity这个工程下面：

　　一、在com.cn.android.daming包的SoundSettingMainActivity.java类中的代码：

　　<span style="font-size:16px;color:#000000;">package com.cn.android.daming;import android.content.Intent;import android.content.SharedPreferences;import android.media.Ringtone;import android.media.RingtoneManager;import android.net.Uri;import android.os.Bundle;import android.preference.Preference;import android.preference.PreferenceActivity;import android.preference.PreferenceManager;import android.preference.PreferenceScreen;public class SoundSettingMainActivity extends PreferenceActivity {private static final int SMS_RINGTONE_PICKED = 1;private static final int PHONE_RINGTONE_PICKED = 2;private static final int ALARM_RINGTONE_PICKED = 3;private static final int SDCARD_RINGTONE_PICKED = 4;public static final String NOTIFICATION_RINGTONE = "pref_notification_ringtone";public static final String NOTIFICATION_RINGTONE_TITLE_NAME = "pref_notification_ringtone_name";public static final String PHONE_RINGTONE = "pref_phone_ringtone";public static final String PHONE_RINGTONE_TITLE_NAME = "pref_phone_ringtone_title_name";public static final String ALARM_RINGTONE = "pref_alarm_ringtone";public static final String ALARM_RINGTONE_TITLE_NAME = "pref_alarm_ringtone_title_name";public static final String SDCARD_RINGTONE = "pref_sdcard_ringtone";public static final String SDCARD_RINGTONE_TITLE_NAME = "pref_sdcard_ringtone_title_name";private String notificationStr;private String phoneStr;private String alarmStr;private String sdcardStr;private Preference mMmsSoundsPref;private Preference mPhoneSoundsPref;private Preference mAlarmSoundsPref;private Preference mSdcardSoundsPref;@Overridepublic void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);addPreferencesFromResource(R.xml.preferences);setMessagePreferences();setDefaultPreferences();}private void setMessagePreferences() {mMmsSoundsPref = findPreference("pref_sms_ringtone");mPhoneSoundsPref = findPreference("pref_phone_ringtone");mAlarmSoundsPref = findPreference("pref_alarm_ringtone");mSdcardSoundsPref = findPreference("pref_sdcard_ringtone");}private void setDefaultPreferences(){SharedPreferences innersharedPreferences = PreferenceManager.getDefaultSharedPreferences(SoundSettingMainActivity.this);String notificationRingtoneTitleName = innersharedPreferences.getString(NOTIFICATION_RINGTONE_TITLE_NAME, null);if(notificationRingtoneTitleName!=null){mMmsSoundsPref.setSummary(notificationRingtoneTitleName);}else{mMmsSoundsPref.setSummary(getString(R.string.pref_summary_notification_ringtone));}String phoneRingtoneTitleName = innersharedPreferences.getString(PHONE_RINGTONE_TITLE_NAME, null);if(phoneRingtoneTitleName!=null){mPhoneSoundsPref.setSummary(phoneRingtoneTitleName);}else{mPhoneSoundsPref.setSummary(getString(R.string.pref_summary_phone_ringtone));}String alarmRingtoneTitleName = innersharedPreferences.getString(ALARM_RINGTONE_TITLE_NAME, null);if(alarmRingtoneTitleName!=null){mAlarmSoundsPref.setSummary(alarmRingtoneTitleName);}else{mAlarmSoundsPref.setSummary(getString(R.string.pref_summary_alarm_ringtone));}String sdcardRingtoneTitleName = innersharedPreferences.getString(SDCARD_RINGTONE_TITLE_NAME, null);if(sdcardRingtoneTitleName!=null){mSdcardSoundsPref.setSummary(sdcardRingtoneTitleName);}else{mSdcardSoundsPref.setSummary(getString(R.string.pref_summary_sdcard_ringtone));}}@Overridepublic boolean onPreferenceTreeClick(PreferenceScreen preferenceScreen,Preference preference) {if (preference == mMmsSoundsPref){doPickSmsRingtone();}else if(preference == mPhoneSoundsPref){doPickPhoneRingtone();}else if(preference == mAlarmSoundsPref){doPickAlarmRingtone();}else if(preference == mSdcardSoundsPref){doPickSdcardRingtone();}return super.onPreferenceTreeClick(preferenceScreen, preference);}private void doPickSmsRingtone(){SharedPreferences sharedPreferences = PreferenceManager.getDefaultSharedPreferences(this);notificationStr = sharedPreferences.getString(NOTIFICATION_RINGTONE, null);Intent intent = new Intent(RingtoneManager.ACTION_RINGTONE_PICKER);// Allow user to pick 'Default'intent.putExtra(RingtoneManager.EXTRA_RINGTONE_SHOW_DEFAULT, true);// Show only ringtonesintent.putExtra(RingtoneManager.EXTRA_RINGTONE_TYPE, RingtoneManager.TYPE_NOTIFICATION);//set the default Notification valueintent.putExtra(RingtoneManager.EXTRA_RINGTONE_DEFAULT_URI, RingtoneManager.getDefaultUri(RingtoneManager.TYPE_NOTIFICATION));// Don't show 'Silent'intent.putExtra(RingtoneManager.EXTRA_RINGTONE_SHOW_SILENT, true);Uri notificationUri;if (notificationStr != null) {notificationUri = Uri.parse(notificationStr);// Put checkmark next to the current ringtone for this contactintent.putExtra(RingtoneManager.EXTRA_RINGTONE_EXISTING_URI, notificationUri);} else {// Otherwise pick default ringtone Uri so that something is selected.notificationUri = RingtoneManager.getDefaultUri(RingtoneManager.TYPE_NOTIFICATION);// Put checkmark next to the current ringtone for this contactintent.putExtra(RingtoneManager.EXTRA_RINGTONE_EXISTING_URI, notificationUri);}// Launch!startActivityForResult(intent, SMS_RINGTONE_PICKED);}private void doPickPhoneRingtone(){SharedPreferences sharedPreferences = PreferenceManager.getDefaultSharedPreferences(this);phoneStr = sharedPreferences.getString(PHONE_RINGTONE, null);Intent intent = new Intent(RingtoneManager.ACTION_RINGTONE_PICKER);// Allow user to pick 'Default'intent.putExtra(RingtoneManager.EXTRA_RINGTONE_SHOW_DEFAULT, true);// Show only ringtonesintent.putExtra(RingtoneManager.EXTRA_RINGTONE_TYPE, RingtoneManager.TYPE_RINGTONE);//set the default Notification valueintent.putExtra(RingtoneManager.EXTRA_RINGTONE_DEFAULT_URI, RingtoneManager.getDefaultUri(RingtoneManager.TYPE_RINGTONE));// Don't show 'Silent'intent.putExtra(RingtoneManager.EXTRA_RINGTONE_SHOW_SILENT, true);Uri phoneUri;if (phoneStr != null) {phoneUri = Uri.parse(phoneStr);// Put checkmark next to the current ringtone for this contactintent.putExtra(RingtoneManager.EXTRA_RINGTONE_EXISTING_URI, phoneUri);} else {// Otherwise pick default ringtone Uri so that something is selected.phoneUri = RingtoneManager.getDefaultUri(RingtoneManager.TYPE_RINGTONE);// Put checkmark next to the current ringtone for this contactintent.putExtra(RingtoneManager.EXTRA_RINGTONE_EXISTING_URI, phoneUri);}startActivityForResult(intent, PHONE_RINGTONE_PICKED);}private void doPickAlarmRingtone(){SharedPreferences sharedPreferences = PreferenceManager.getDefaultSharedPreferences(this);alarmStr = sharedPreferences.getString(ALARM_RINGTONE, null);Intent intent = new Intent(RingtoneManager.ACTION_RINGTONE_PICKER);// Allow user to pick 'Default'intent.putExtra(RingtoneManager.EXTRA_RINGTONE_SHOW_DEFAULT, true);// Show only ringtonesintent.putExtra(RingtoneManager.EXTRA_RINGTONE_TYPE, RingtoneManager.TYPE_ALARM);//set the default Notification valueintent.putExtra(RingtoneManager.EXTRA_RINGTONE_DEFAULT_URI, RingtoneManager.getDefaultUri(RingtoneManager.TYPE_ALARM));// Don't show 'Silent'intent.putExtra(RingtoneManager.EXTRA_RINGTONE_SHOW_SILENT, true);Uri alarmUri;if (alarmStr != null) {alarmUri = Uri.parse(alarmStr);// Put checkmark next to the current ringtone for this contactintent.putExtra(RingtoneManager.EXTRA_RINGTONE_EXISTING_URI, alarmUri);} else {// Otherwise pick default ringtone Uri so that something is selected.alarmUri = RingtoneManager.getDefaultUri(RingtoneManager.TYPE_ALARM);// Put checkmark next to the current ringtone for this contactintent.putExtra(RingtoneManager.EXTRA_RINGTONE_EXISTING_URI, alarmUri);}startActivityForResult(intent, ALARM_RINGTONE_PICKED);}private void doPickSdcardRingtone(){SharedPreferences sharedPreferences = PreferenceManager.getDefaultSharedPreferences(this);sdcardStr = sharedPreferences.getString(SDCARD_RINGTONE, null);Uri sdcardUri = null;if (sdcardStr != null) {sdcardUri = Uri.parse(sdcardStr);}Intent innerIntent = new Intent(Intent.ACTION_GET_CONTENT);innerIntent.setType("audio/*");//you could lookup the framework the type of audio,if you don`t want use the Recorder use the note code// innerIntent.setType("audio/aac");// innerIntent.setType("audio/mp3");// innerIntent.setType("audio/midi");// Put checkmark next to the current ringtone for this contactinnerIntent.putExtra(RingtoneManager.EXTRA_RINGTONE_EXISTING_URI, sdcardUri);Intent wrapperIntent = Intent.createChooser(innerIntent, null);startActivityForResult(wrapperIntent, SDCARD_RINGTONE_PICKED);}@Overrideprotected void onResume() {setDefaultPreferences();super.onResume();}@Overrideprotected void onActivityResult(int requestCode, int resultCode, Intent data) {SharedPreferences sharedPreferences = PreferenceManager.getDefaultSharedPreferences(this);SharedPreferences.Editor editor = sharedPreferences.edit();if (resultCode != RESULT_OK) {return;}switch (requestCode) {case SMS_RINGTONE_PICKED:{Uri pickedUri = data.getParcelableExtra(RingtoneManager.EXTRA_RINGTONE_PICKED_URI);if(null == pickedUri){editor.putString(NOTIFICATION_RINGTONE_TITLE_NAME, getString(R.string.select_ringtone_slient));editor.putString(NOTIFICATION_RINGTONE, null);editor.commit();}else{Ringtone ringtone = RingtoneManager.getRingtone(SoundSettingMainActivity.this, pickedUri);String strRingtone = ringtone.getTitle(SoundSettingMainActivity.this);editor.putString(NOTIFICATION_RINGTONE_TITLE_NAME, strRingtone);editor.putString(NOTIFICATION_RINGTONE, pickedUri.toString());editor.commit();}break;}case PHONE_RINGTONE_PICKED:{Uri pickedUri = data.getParcelableExtra(RingtoneManager.EXTRA_RINGTONE_PICKED_URI);if(null == pickedUri){editor.putString(PHONE_RINGTONE_TITLE_NAME, getString(R.string.select_ringtone_slient));editor.putString(PHONE_RINGTONE, null);editor.commit();}else{phoneStr = pickedUri.toString();Ringtone ringtone = RingtoneManager.getRingtone(SoundSettingMainActivity.this, pickedUri);String strRingtone = ringtone.getTitle(SoundSettingMainActivity.this);editor.putString(PHONE_RINGTONE_TITLE_NAME, strRingtone);editor.putString(PHONE_RINGTONE, pickedUri.toString());editor.commit();}break;}case ALARM_RINGTONE_PICKED:{Uri pickedUri = data.getParcelableExtra(RingtoneManager.EXTRA_RINGTONE_PICKED_URI);if(null == pickedUri){editor.putString(ALARM_RINGTONE_TITLE_NAME, getString(R.string.select_ringtone_slient));editor.putString(ALARM_RINGTONE, null);editor.commit();}else{Ringtone ringtone = RingtoneManager.getRingtone(SoundSettingMainActivity.this, pickedUri);String strRingtone = ringtone.getTitle(SoundSettingMainActivity.this);editor.putString(ALARM_RINGTONE_TITLE_NAME, strRingtone);editor.putString(ALARM_RINGTONE, pickedUri.toString());editor.commit();}break;}case SDCARD_RINGTONE_PICKED:{Uri pickedUri = data.getData();if(null != pickedUri){notificationStr = pickedUri.toString();Ringtone ringtone = RingtoneManager.getRingtone(SoundSettingMainActivity.this, pickedUri);String strRingtone = ringtone.getTitle(SoundSettingMainActivity.this);editor.putString(SDCARD_RINGTONE_TITLE_NAME, strRingtone);editor.putString(SDCARD_RINGTONE, pickedUri.toString());editor.commit();}break;}default:break;}}}</span>

转载:http://www.adobex.com/android/source/details/00000215.htm