指的是:external.db和internal.db中对应的MediaStore.Audio.Media.EXTERNAL_CONTENT_URI和MediaStore.Audio.Media.EXTERNAL_CONTENT_URI
content://media/external/audio/media/id 和 content://media/internal/audio/media/id
id就是其在MediaProvider中对应的数据库中的id
MediaStore.Audio.Media.EXTERNAL_CONTENT_URI---content://media/external/audio/media/id
对应的数据库:/data/data/com.android.providers.media/databases/external.db
MediaStore.Audio.Media.EXTERNAL_CONTENT_URI---content://media/internal/audio/media/id
对应的数据库:/data/data/com.android.providers.media/databases/internal.db
authority是media
content://setting/system/***
Settings.System.DEFAULT_NOTIFICATION_URI----content://setting/system/notification_sound
Settings.System.DEFAULT_RINGTONE_URI------content://settings/system/ringtone
Settings.System.DEFAULT_ALARM_ALERT_URI-----content://settings/system/alarm_alert
authority是settings
android M以前对应的数据库data\data\com.android.providers.settings\databases\这个目录下的Settings.db (如android L)
android M SettingsProvider数据库的变化,变化如下,之前系统修改的数据最后是存储在data/data/com.android.providers.settings/databases目录下,现在该目录下存放了一个backup数据库,里面的数据不是当前系统设置的全部数据,只有一部分内容,另一个是journal数据库,无数据。现在的数据库真正的数据存储目录在data/system/users/userId(我们没开启多用户,userid为0),数据存储形式不是以db的形式,如下截图,为数据三个表分别对应system,secure和global,查看相应数据可以导出对应的xml。
settings_system.xml中存储的就有content://setting/system/..,存储的value是第一种形式,所以其本质是把第一种数据uri形式存储在settings_system.xml中。
settings_system.xml 所有的偏好设置对系统的所有用户公开,第三方APP有读没有写的权限;
settings_global.xml 包含各种各样的用户偏好系统设置;
settings_secure.xml 安全性的用户偏好系统设置,第三方APP有读没有写的权限
这里可以直接adb修改配置值,方便开发人员测试:
adb shell settings put system xxxx 1
adb shell settings get system xxx
adb shell settings put global xxx 0
content://com.android.providers.media.documents/document/audio%3A82482
content://com.android.providers.downloads.documents/document/audio%3A82556
content://com.android.externalstorage.documents//document/audio%8N584645
authority是com.android.providers.*.documents
其DocumentsContract.getDocumentId(uri)进行String串的处理获取id转化为第一种形式,本质上是对第一种形式的包装
if (isMediaDocument(uri)) {
final String docId = DocumentsContract.getDocumentId(uri);
final String[] split = docId.split(":");
final String id = split[1];
Uri contentUri = ContentUris.withAppendedId(
Uri.parse("content://media/external/audio/media/"), Long.valueOf(id));
return contentUri;
...
不管那种类型或形式都是下面这种格式:
content://authority/path/id
返回给RingtonePickerActivity的uri如果不是第三中形式需要对uri处理转化为第一种形式
通过访问settings_system.xml获取对应的value,也就是存储的第一种形式的content uri的String形式
String uriString = Settings.System.getString(
context.getContentResolver(), Settings.System.RINGTONE.toString());
返回给RingtonePickerActivity的uri如果不是第三中形式需要对uri处理转化为第一种形式 authority是com.android.providers…
这种有三种,需要分别处理如下:
/**
* Gets the content:// URI from the given corresponding path to a file
*
* @param context
* @param path
* @return content Uri
*/
private static Uri getContentUriWithPath(ContentResolver resolver, String path) {
Cursor cursor = null;
String filePath = path;
try {
cursor = resolver.query(MediaStore.Audio.Media.EXTERNAL_CONTENT_URI,
new String[] { MediaStore.Audio.Media._ID },
MediaStore.Audio.Media.DATA + "=? ",
new String[] { filePath }, null);
if (cursor != null && cursor.moveToFirst()) {
int id = cursor.getInt(cursor.getColumnIndex(
MediaStore.MediaColumns._ID));
Uri baseUri = Uri.parse("content://media/external/audio/media");
return Uri.withAppendedPath(baseUri, "" + id);
} else {
if (filePath != null) {
ContentValues values = new ContentValues();
values.put(MediaStore.Audio.Media.DATA, filePath);
return resolver.insert(MediaStore.
Audio.Media.EXTERNAL_CONTENT_URI, values);
} else {
return null;
}
}
}finally {
if (cursor != null)
cursor.close();
}
}
public static String getDataColumn(ContentResolver resolver, Uri uri, String selection,
String[] selectionArgs) {
Cursor cursor = null;
final String column = "_data";
final String[] projection = { column };
try {
cursor = resolver.query(uri, projection, selection, selectionArgs,
null);
if (cursor != null && cursor.moveToFirst()) {
final int index = cursor.getColumnIndexOrThrow(column);
//Log.d(TAG, "cursor.getString(index) = " + cursor.getString(index));
return cursor.getString(index);
}
} finally {
if (cursor != null)
cursor.close();
}
return null;
}
private Uri getContentUri(ContentResolver resolver, Uri uri){
if (DocumentsContract.isDocumentUri(this, uri)) {
if (isMediaDocument(uri)) {
final String docId = DocumentsContract.getDocumentId(uri);
final String[] split = docId.split(":");
final String id = split[1];
Uri contentUri = ContentUris.withAppendedId(
Uri.parse("content://media/external/audio/media/"), Long.valueOf(id));
return contentUri;
}else if (isExternalStorageDocument(uri)){
//Log.d(TAG, "****ExternalStorageDocument****");
final String docId = DocumentsContract.getDocumentId(uri);
//Log.d(TAG, "getContentUri: docId = " + docId);
final String[] split = docId.split(":");
final String type = split[0];
String path = null;
if ("primary".equalsIgnoreCase(type)) {
path = Environment.getExternalStorageDirectory() + "/" + split[1];
//Log.d(TAG, "getContentUri: primary path = " + path);
}else{
path = "/storage/" + split[0] + "/" + split[1];
//Log.d(TAG, "getContentUri: path = " + path);
}
return getContentUriWithPath(resolver,path);
}else if (isDownloadsDocument(uri)){
Log.d(TAG, "****DownloadsDocument****");
final String id = DocumentsContract.getDocumentId(uri);
//Log.d(TAG, "getContentUri ,getDocumentId: Id = " + id);
final Uri downloadsUri = ContentUris.withAppendedId(
Uri.parse("content://downloads/public_downloads"), Long.valueOf(id));
//Log.d(TAG, "downloadsUri:" + downloadsUri.toString());
String path = getDataColumn(resolver, downloadsUri, null, null);
return getContentUriWithPath(resolver,path);
}
}
return uri;
}
/**
* @param uri The Uri to check.
* @return Whether the Uri authority is ExternalStorageProvider.
*/
public static boolean isExternalStorageDocument(Uri uri) {
return "com.android.externalstorage.documents".equals(uri.getAuthority());
}
/**
* @param uri The Uri to check.
* @return Whether the Uri authority is DownloadsProvider.
*/
public static boolean isDownloadsDocument(Uri uri) {
return "com.android.providers.downloads.documents".equals(uri.getAuthority());
}
/**
* @param uri The Uri to check.
* @return Whether the Uri authority is MediaProvider.
*/
public static boolean isMediaDocument(Uri uri) {
return "com.android.providers.media.documents".equals(uri.getAuthority());
}
/platform/build / target/product/full_base.mk
PRODUCT_PROPERTY_OVERRIDES := \
ro.config.ringtone=Ring_Synth_04.ogg \
ro.config.notification_sound=pixiedust.ogg
......
/platform/build / target/product/full_base.mk中会copy一部分internal ringtone
$(call inherit-product-if-exists, frameworks/base/data/sounds/AllAudio.mk)
AllAudio.mk会把audio资源copy到系统Ringtones、Notifications、Alarms目录下,也可在vendor下定制自己的铃声列表和默认铃声
在MediaScanner扫描文件时,判断到如果文件的路径含有Ringtones,则认为它是铃声,并将其在database的is_ringtone这个属性的栏位置为1,RingtonePickerActivity的初始铃声列表就是这些is_ringtone属性为1的资源
铃声列表查询铃声时,使用的过滤条件就是is_ringtone 为1的铃声,所以会将所有is_ringtone 为1的铃声过滤出来,Hangouts Call /Hangouts Message在应用的Ringtones目录中且is_ringtone 属性为1,也会在“铃声列表“中被过滤出来因此Hangouts Call.ogg /Hangouts Message.ogg会出现在ringtones中,出现在Notification中是同样的原因。
可以去除Hangouts Call /Hangouts Message显示在初始铃声列表:
frameworks / base/media/java/android/media/MediaScanner.java
//ADD BEGIN
private static final String SYS_RINGTONES_DIR = "system/media/audio/ringtones/";
private static final String SYS_NOTIFICATIONS_DIR =
"system/media/audio/notifications/";
//ADD END
......
public Uri doScanFile(String path, String mimeType, long lastModified,
long fileSize, boolean isDirectory, boolean scanAlways, boolean noMedia) {
Uri result = null;
try {
...
if (entry != null && (entry.mLastModifiedChanged || scanAlways)) {
if (noMedia) {
result = endFile(entry, false, false, false, false, false);
} else {
String lowpath = path.toLowerCase(Locale.ROOT);
//MOD BEGIN
boolean ringtones = (lowpath.indexOf(SYS_RINGTONES_DIR) > 0);
boolean notifications = (lowpath.indexOf(SYS_NOTIFICATIONS_DIR) > 0);
//MOD END
boolean alarms = (lowpath.indexOf(ALARMS_DIR) > 0);
boolean podcasts = (lowpath.indexOf(PODCAST_DIR) > 0);
boolean music = (lowpath.indexOf(MUSIC_DIR) > 0) ||
(!ringtones && !notifications && !alarms && !podcasts);
......