我正在学习几周的课程，我很绝望！我已经停止了这个问题：
我提出了一个选项，用户可以选择你想要的铃声消息通知，工作完美！但是，我想将我的铃声放在.mp3中，并将其设置为默认值。
我正在寻找几天，我仍然无法得到响应，.mp3我放在/ raw文件夹中
我将发送我拥有的代码，xml和Java。
pref_notification.xml
<PreferenceScreen xmlns:android="http://schemas.android.com/apk/res/android">
<!-- A 'parent' preference, which enables/disables child preferences (below)
when checked/unchecked. -->
<SwitchPreference
android:textColor="@color/colorAccent"
android:defaultValue="true"
android:key="notifications_new_message"
android:title="@string/pref_title_new_message_notifications" />
<!-- Allows the user to choose a ringtone in the 'notify' category. -->
<!-- NOTE: This preference will be enabled only when the checkbox above is checked. -->
<!-- NOTE: RingtonePreference's summary should be set to its value by the activity code. -->
**<RingtonePreference**
android:defaultValue="content://settings/system/notification_sound"
android:dependency="notifications_new_message"
android:key="notifications_new_message_ringtone"
android:ringtoneType="notification"
android:title="@string/pref_title_ringtone" />
<!-- NOTE: This preference will be enabled only when the checkbox above is checked. -->
<SwitchPreference
android:defaultValue="false"
android:dependency="notifications_new_message"
android:key="notifications_new_message_vibrate"
android:title="@string/pref_title_vibrate" />
ringtone preference.Java
public class RingtonePreference extends Preference implements
PreferenceManager.OnActivityResultListener {
private static final String TAG = "RingtonePreference";
private int mRingtoneType;
private boolean mShowDefault;
private boolean mShowSilent;
private int mRequestCode;
public RingtonePreference(Context context, AttributeSet attrs, int defStyleAttr, int defStyleRes) {
super(context, attrs, defStyleAttr, defStyleRes);
final TypedArray a = context.obtainStyledAttributes(attrs,
com.android.internal.R.styleable.RingtonePreference, defStyleAttr, defStyleRes);
mRingtoneType = a.getInt(com.android.internal.R.styleable.RingtonePreference_ringtoneType,
RingtoneManager.TYPE_RINGTONE);
mShowDefault = a.getBoolean(com.android.internal.R.styleable.RingtonePreference_showDefault,
true);
mShowSilent = a.getBoolean(com.android.internal.R.styleable.RingtonePreference_showSilent,
true);
a.recycle();
}
public RingtonePreference(Context context, AttributeSet attrs, int defStyleAttr) {
this(context, attrs, defStyleAttr, 0);
}
public RingtonePreference(Context context, AttributeSet attrs) {
this(context, attrs, com.android.internal.+R.);
}
public RingtonePreference(Context context) {
this(context, null);
}
/**
* Returns the sound type(s) that are shown in the picker.
*
* @return The sound type(s) that are shown in the picker.
* @see #setRingtoneType(int)
*/
public int getRingtoneType() {
return mRingtoneType;
}
/**
* Sets the sound type(s) that are shown in the picker.
*
* @param type The sound type(s) that are shown in the picker.
* @see RingtoneManager#EXTRA_RINGTONE_TYPE
*/
public void setRingtoneType(int type) {
mRingtoneType = type;
}
/**
* Returns whether to a show an item for the default sound/ringtone.
*
* @return Whether to show an item for the default sound/ringtone.
*/
public boolean getShowDefault() {
return mShowDefault;
}
/**
* Sets whether to show an item for the default sound/ringtone. The default
* to use will be deduced from the sound type(s) being shown.
*
* @param showDefault Whether to show the default or not.
* @see RingtoneManager#EXTRA_RINGTONE_SHOW_DEFAULT
*/
public void setShowDefault(boolean showDefault) {
mShowDefault = showDefault;
}
/**
* Returns whether to a show an item for 'Silent'.
*
* @return Whether to show an item for 'Silent'.
*/
public boolean getShowSilent() {
return mShowSilent;
}
/**
* Sets whether to show an item for 'Silent'.
*
* @param showSilent Whether to show 'Silent'.
* @see RingtoneManager#EXTRA_RINGTONE_SHOW_SILENT
*/
public void setShowSilent(boolean showSilent) {
mShowSilent = showSilent;
}
@Override
protected void onClick() {
// Launch the ringtone picker
Intent intent = new Intent(RingtoneManager.ACTION_RINGTONE_PICKER);
onPrepareRingtonePickerIntent(intent);
PreferenceFragment owningFragment = getPreferenceManager().getFragment();
if (owningFragment != null) {
owningFragment.startActivityForResult(intent, mRequestCode);
} else {
getPreferenceManager().getActivity().startActivityForResult(intent, mRequestCode);
}
}
/**
* Prepares the intent to launch the ringtone picker. This can be modified
* to adjust the parameters of the ringtone picker.
*
* @param ringtonePickerIntent The ringtone picker intent that can be
* modified by putting extras.
*/
protected void onPrepareRingtonePickerIntent(Intent ringtonePickerIntent) {
ringtonePickerIntent.putExtra(RingtoneManager.EXTRA_RINGTONE_EXISTING_URI,
onRestoreRingtone());
ringtonePickerIntent.putExtra(RingtoneManager.EXTRA_RINGTONE_SHOW_DEFAULT, mShowDefault);
if (mShowDefault) {
ringtonePickerIntent.putExtra(RingtoneManager.EXTRA_RINGTONE_DEFAULT_URI,
RingtoneManager.getDefaultUri(getRingtoneType()));
}
ringtonePickerIntent.putExtra(RingtoneManager.EXTRA_RINGTONE_SHOW_SILENT, mShowSilent);
ringtonePickerIntent.putExtra(RingtoneManager.EXTRA_RINGTONE_TYPE, mRingtoneType);
ringtonePickerIntent.putExtra(RingtoneManager.EXTRA_RINGTONE_TITLE, getTitle());
ringtonePickerIntent.putExtra(RingtoneManager.EXTRA_RINGTONE_AUDIO_ATTRIBUTES_FLAGS,
AudioAttributes.FLAG_BYPASS_INTERRUPTION_POLICY);
}
/**
* Called when a ringtone is chosen.
* <p>
* By default, this saves the ringtone URI to the persistent storage as a
* string.
*
* @param ringtoneUri The chosen ringtone's {@link Uri}. Can be null.
*/
protected void onSaveRingtone(Uri ringtoneUri) {
persistString(ringtoneUri != null ? ringtoneUri.toString() : "");
}
/**
* Called when the chooser is about to be shown and the current ringtone
* should be marked. Can return null to not mark any ringtone.
* <p>
* By default, this restores the previous ringtone URI from the persistent
* storage.
*
* @return The ringtone to be marked as the current ringtone.
*/
protected Uri onRestoreRingtone() {
final String uriString = getPersistedString(null);
return !TextUtils.isEmpty(uriString) ? Uri.parse(uriString) : null;
}
@Override
protected Object onGetDefaultValue(TypedArray a, int index) {
return a.getString(index);
}
@Override
protected void onSetInitialValue(boolean restorePersistedValue, Object defaultValueObj) {
String defaultValue = (String) defaultValueObj;
/*
* This method is normally to make sure the internal state and UI
* matches either the persisted value or the default value. Since we
* don't show the current value in the UI (until the dialog is opened)
* and we don't keep local state, if we are restoring the persisted
* value we don't need to do anything.
*/
if (restorePersistedValue) {
return;
}
// If we are setting to the default value, we should persist it.
if (!TextUtils.isEmpty(defaultValue)) {
onSaveRingtone(Uri.parse(defaultValue));
}
}
@Override
protected void onAttachedToHierarchy(PreferenceManager preferenceManager) {
super.onAttachedToHierarchy(preferenceManager);
preferenceManager.registerOnActivityResultListener(this);
mRequestCode = preferenceManager.getNextRequestCode();
}
public boolean onActivityResult(int requestCode, int resultCode, Intent data) {
if (requestCode == mRequestCode) {
if (data != null) {
Uri uri = data.getParcelableExtra(RingtoneManager.EXTRA_RINGTONE_PICKED_URI);
if (callChangeListener(uri != null ? uri.toString() : "")) {
onSaveRingtone(uri);
}
}
return true;
}
return false;
}
}
myNotificationNameInRaw是raw文件夹中音频文件的名称
String name = "myNotificationNameInRaw";
File file = new File(Environment.getExternalStorageDirectory(), "/myRingtonFolder/Audio/");
if (!file.exists()) {
file.mkdirs();
}
String path = Environment.getExternalStorageDirectory().getAbsolutePath() + "/myRingtonFolder/Audio/";
File f = new File(path + "/", name + ".mp3");
Uri mUri = Uri.parse("android.resource://" + context.getPackageName() + "/raw/" + name);
ContentResolver mCr = context.getContentResolver();
AssetFileDescriptor soundFile;
try {
soundFile = mCr.openAssetFileDescriptor(mUri, "r");
} catch (FileNotFoundException e) {
soundFile = null;
e.printStackTrace();
}
try {
byte[] readData = new byte[1024];
FileInputStream fis = soundFile.createInputStream();
FileOutputStream fos = new FileOutputStream(f);
int i = fis.read(readData);
while (i != -1) {
fos.write(readData, 0, i);
i = fis.read(readData);
}
fos.close();
} catch (IOException io) {
io.printStackTrace();
}
ContentValues values = new ContentValues();
values.put(MediaStore.MediaColumns.DATA, f.getAbsolutePath());
values.put(MediaStore.MediaColumns.TITLE, name);
values.put(MediaStore.MediaColumns.MIME_TYPE, "audio/mp3");
values.put(MediaStore.MediaColumns.SIZE, f.length());
values.put(MediaStore.Audio.Media.ARTIST, R.string.app_name);
values.put(MediaStore.Audio.Media.IS_RINGTONE, false);
values.put(MediaStore.Audio.Media.IS_NOTIFICATION, true);
values.put(MediaStore.Audio.Media.IS_ALARM, false);
values.put(MediaStore.Audio.Media.IS_MUSIC, false);
Uri uri = MediaStore.Audio.Media.getContentUriForPath(f.getAbsolutePath());
Uri newUri = mCr.insert(uri, values);
try {
RingtoneManager.setActualDefaultRingtoneUri(context, RingtoneManager.TYPE_NOTIFICATION, newUri);
Settings.System.putString(mCr, Settings.System.NOTIFICATION_SOUND, newUri.toString());
} catch (Throwable t) {
t.printStackTrace();
}
还要确保添加权限
<uses-permission android:name="android.permission.WRITE_SETTINGS" ></uses-permission>