android通过USB的MTP模式下，禁止用户在根目录有任何操作（重命名删除显示特定文件夹）（用户可以定制）

均在在frameworks/base/media/java/android/mtp/中找到MtpDatabase.java文件中完成

Settings.System.putString(getApplicationContext().getContentResolver(), "filename","'DCIM','Android','Music','Movies'");//在计算机要显示的文件夹
Settings.System.putString(getApplicationContext().getContentResolver(),"renamefile","/storage/emulated/0/Movies,/storage/emulated/0/DCIM");//不可以重命名文件
Settings.System.putString(getApplicationContext().getContentResolver(),"deletenamefile","/storage/emulated/0/Android,/storage/emulated/0/Music");//禁止删除的文件

在PC上只显示指定文件夹 createObjectQuery()中

private Cursor createObjectQuery(int storageID, int format, int parent) throws RemoteException {
String where;
String[] whereArgs;
/// M: Added for USB Develpment debug, more log for more debuging help @{
SXlog.i(TAG, "createObjectQuery: storageID = 0x "+Integer.toHexString(storageID));
SXlog.i(TAG, "createObjectQuery: format = 0x "+Integer.toHexString(format));
SXlog.i(TAG, "createObjectQuery: parent = 0x "+Integer.toHexString(parent));
/// M: @}
if (storageID == 0xFFFFFFFF) {
// query all stores
if (format == 0) {
// query all formats
if (parent == 0) {
// query all objects
where = null;
whereArgs = null;
} else {
if (parent == 0xFFFFFFFF) {
// all objects in root of store
parent = 0;
}
where = PARENT_WHERE;
whereArgs = new String[] { Integer.toString(parent) };
}
} else {
// query specific format
if (parent == 0) {
// query all objects
where = FORMAT_WHERE;
whereArgs = new String[] { Integer.toString(format) };
} else {
if (parent == 0xFFFFFFFF) {
// all objects in root of store
parent = 0;
}
where = FORMAT_PARENT_WHERE;
whereArgs = new String[] { Integer.toString(format),
Integer.toString(parent) };
}
}
} else {
// query specific store
if (format == 0) {
// query all formats
if (parent == 0) {
// query all objects
where = STORAGE_WHERE;
whereArgs = new String[] { Integer.toString(storageID) };
} else {
/*wanchengguo add 20180711 在PC上只显示指定文件夹begin*/
/*if (parent == 0xFFFFFFFF) {
// all objects in root of store
parent = 0;
}
where = FORMAT_PARENT_WHERE;
*/
if (parent == 0xFFFFFFFF) {
// all objects in root of store
parent = 0;
String filename;//,"file_name in ('DCIM','Log','Movies')"
filename = Settings.System.getString(mContext.getContentResolver(), "filename");
Log.e("wanchengguo", "580filename="+filename);
Log.e("wanchengguo", "270filename="+filename);
SXlog.i("wanchengguo", "filename = "+filename);
if(filename==""){
filename = "'DCIM','Picture','Movies'";
}
SXlog.i("wanchengguo", "lengthDeviceName = "+filename.length());
if(filename.length()>0) {
where = STORAGE_PARENT_WHERE+ " AND " +"file_name in ("+filename+")";
}else{
where = STORAGE_PARENT_WHERE;
}
} else{
// code by WenYF
where = STORAGE_PARENT_WHERE;
}
/*wanchengguo add 20180711 在PC上只显示指定文件夹end*/
whereArgs = new String[] { Integer.toString(storageID),
Integer.toString(parent) };
}
} else {
// query specific format
if (parent == 0) {
// query all objects
where = STORAGE_FORMAT_WHERE;
whereArgs = new String[] { Integer.toString(storageID),
Integer.toString(format) };
} else {
if (parent == 0xFFFFFFFF) {
// all objects in root of store
parent = 0;
}
where = STORAGE_FORMAT_PARENT_WHERE;
whereArgs = new String[] { Integer.toString(storageID),
Integer.toString(format),
Integer.toString(parent) };
}
}
}
// if we are restricting queries to mSubDirectories, we need to add the restriction
// onto our "where" arguments
if (mSubDirectoriesWhere != null) {
/// M: Added for USB Develpment debug, more log for more debuging help
SXlog.i(TAG, "createObjectQuery: mSubDirectoriesWhere = "+mSubDirectoriesWhere);
if (where == null) {
where = mSubDirectoriesWhere;
whereArgs = mSubDirectoriesWhereArgs;
} else {
where = where + " AND " + mSubDirectoriesWhere;
// create new array to hold whereArgs and mSubDirectoriesWhereArgs
String[] newWhereArgs =
new String[whereArgs.length + mSubDirectoriesWhereArgs.length];
int i, j;
for (i = 0; i < whereArgs.length; i++) {
newWhereArgs[i] = whereArgs[i];
}
for (j = 0; j < mSubDirectoriesWhereArgs.length; i++, j++) {
newWhereArgs[i] = mSubDirectoriesWhereArgs[j];
}
whereArgs = newWhereArgs;
}
} else {
/// M: Added for USB Develpment debug, more log for more debuging help
SXlog.e(TAG, "createObjectQuery: mSubDirectoriesWhere = null");
}
return mMediaProvider.query(mPackageName, mObjectsUri, ID_PROJECTION, where,
whereArgs, null, null);
}

重命名文件在renameFile()中

private static final String[] PATH_PROJECTION = new String[] {
Files.FileColumns._ID, // 0
Files.FileColumns.DATA, // 1
Files.FileColumns.PARENT,//2 ADD Files.FileColumns.PARENT 目的是禁止修改头层文件名 wanchengguo 20180716
};

private int renameFile(int handle, String newName) {
Cursor c = null;
// first compute current path
String path = null;
int parent = -1;//禁止修改头层文件名 wanchengguo 20180716
String[] whereArgs = new String[] { Integer.toString(handle) };
try {
c = mMediaProvider.query(mPackageName, mObjectsUri, PATH_PROJECTION, ID_WHERE,
whereArgs, null, null);
if (c != null && c.moveToNext()) {
path = c.getString(1);
parent = c.getInt(2);//禁止修改头层文件名 wanchengguo 20180716
}
} catch (RemoteException e) {
Log.e(TAG, "RemoteException in getObjectFilePath", e);
return MtpConstants.RESPONSE_GENERAL_ERROR;
} finally {
if (c != null) {
c.close();
}
}
if (path == null) {
return MtpConstants.RESPONSE_INVALID_OBJECT_HANDLE;
}
// do not allow renaming any of the special subdirectories
SXlog.e("wanchengguo", "path "+path);
//path = /storage/emulated/0/Movies
if (isStorageSubDirectory(path)) {
//&&path=="/storage/emulated/0/Movies"
return MtpConstants.RESPONSE_OBJECT_WRITE_PROTECTED;
}
String renamefile = Settings.System.getString(mContext.getContentResolver(), "renamefile");
int lengthReName = renamefile.length();
SXlog.i("wanchengguo", "lengthReName = "+lengthReName);
if(parent != -1&&renamefile.length()>0&&renamefile.contains(path)){//parent == 0是头层文件！=-1是所有文件禁止修改文件名 wanchengguo 20180716
return MtpConstants.RESPONSE_OBJECT_WRITE_PROTECTED;
}
// now rename the file. make sure this succeeds before updating database
File oldFile = new File(path);
int lastSlash = path.lastIndexOf('/');
if (lastSlash <= 1) {
return MtpConstants.RESPONSE_GENERAL_ERROR;
}
String newPath = path.substring(0, lastSlash + 1) + newName;
File newFile = new File(newPath);
boolean success = oldFile.renameTo(newFile);

禁止删除文件 deleteFile(int handle)

private static final String[] PATH_FORMAT_PROJECTION = new String[] {
Files.FileColumns._ID, // 0
Files.FileColumns.DATA, // 1
Files.FileColumns.FORMAT, // 2
Files.FileColumns.FORMAT, // 3 add Files.FileColumns.FORMAT 禁止删除头层文件夹 wanchengguo 20180716

private int deleteFile(int handle) {
mDatabaseModified = true;
String path = null;
int format = 0;
int parent = -1;//禁止删除头层文件夹 wanchengguo 20180716
/// M: Added for USB Develpment debug, more log for more debuging help
SXlog.d(TAG, "deleteFile: handle = 0x"+ Integer.toHexString(handle));
/// M: Added for USB Develpment debug, more log for more debuging help
Cursor c = null;
try {
c = mMediaProvider.query(mPackageName, mObjectsUri, PATH_FORMAT_PROJECTION,
ID_WHERE, new String[] { Integer.toString(handle) }, null, null);
if (c != null && c.moveToNext()) {
// don't convert to media path here, since we will be matching
// against paths in the database matching /data/media
path = c.getString(1);
format = c.getInt(2);
parent = c.getInt(3);//禁止删除头层文件夹 wanchengguo 20180716
} else {
return MtpConstants.RESPONSE_INVALID_OBJECT_HANDLE;
}
if (path == null || format == 0) {
return MtpConstants.RESPONSE_GENERAL_ERROR;
}
String deletenamefile = Settings.System.getString(mContext.getContentResolver(), "deletenamefile");
SXlog.e("wanchengguo", "953renamefile.contains(path) "+deletenamefile.contains(path));
int lengthDeleteName = deletenamefile.length();
SXlog.i("wanchengguo", "lengthDeleteName = "+lengthDeleteName);
//禁止删除头层文件夹 wanchengguo 20180716 begin
if (parent != -1&&deletenamefile.length()>0&&deletenamefile.contains(path)) {
// return MtpConstants.RESPONSE_ACCESS_DENIED;
return MtpConstants.RESPONSE_GENERAL_ERROR;
}
//禁止删除头层文件夹 wanchengguo 20180716 end

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