下面列出了怎么用android.util.Xml.Encoding的API类实例代码及写法，或者点击链接到github查看源代码。
@Override
public byte[] getBackupPayload(int user) {
if (Binder.getCallingUid() != SYSTEM_UID) {
throw new SecurityException("Caller must be system");
}
//TODO: http://b/22388012
if (user != UserHandle.USER_SYSTEM) {
Slog.w(TAG, "getBackupPayload: cannot backup policy for user " + user);
return null;
}
final ByteArrayOutputStream baos = new ByteArrayOutputStream();
try {
XmlSerializer out = XmlPullParserFactory.newInstance().newSerializer();
out.setOutput(baos, Encoding.UTF_8.name());
mPermissions.writeBackup(out);
out.flush();
return baos.toByteArray();
} catch (IOException | XmlPullParserException e) {
Slog.w(TAG, "getBackupPayload: error writing payload for user " + user, e);
}
return null;
}
@Override
public void applyRestore(byte[] payload, int user) {
if (Binder.getCallingUid() != SYSTEM_UID) {
throw new SecurityException("Caller must be system");
}
if (payload == null) {
Slog.w(TAG, "applyRestore: no payload to restore for user " + user);
return;
}
//TODO: http://b/22388012
if (user != UserHandle.USER_SYSTEM) {
Slog.w(TAG, "applyRestore: cannot restore policy for user " + user);
return;
}
final ByteArrayInputStream bais = new ByteArrayInputStream(payload);
try {
XmlPullParser parser = XmlPullParserFactory.newInstance().newPullParser();
parser.setInput(bais, Encoding.UTF_8.name());
mPermissions.readRestore(parser);
} catch (NumberFormatException | XmlPullParserException | IOException e) {
Slog.w(TAG, "applyRestore: error reading payload", e);
}
}
private ParserHolder getParser(String fileName)
throws FileNotFoundException, XmlPullParserException {
AtomicFile file = getFile(fileName);
ParserHolder holder = new ParserHolder();
holder.input = file.openRead();
holder.parser = XmlPullParserFactory.newInstance().newPullParser();
holder.parser.setInput(holder.input, Encoding.UTF_8.name());
return holder;
}
private void populateHandouts(HandoutModel handout) {
hideErrorMessage();
StringBuilder buff = WebViewUtil.getIntialWebviewBuffer(getActivity(), logger);
buff.append("<body>");
buff.append("<div class=\"header\">");
buff.append(handout.handouts_html);
buff.append("</div>");
buff.append("</body>");
webView.loadDataWithBaseURL(environment.getConfig().getApiHostURL(), buff.toString(),
"text/html", Encoding.UTF_8.toString(), null);
}