从第一步我们发现，在第一步修改之后，在短彩绘画界面中中文附件名的附件已无法显示，经过打印堆栈我们发现还是中文乱码在作祟。下面我们接着进行分析，这次我们从UI层往逻辑处理层进行分析。首先我们找到保存附件操作的页面和相关的代码：
短彩会话界面ComposeMessageActivity.java类中的MsgListMenuClickListener子类，onMenuItemClick（）方法：<TAG 1-1>
/**
* Context menu handlers for the message list view.
*/
private final class MsgListMenuClickListener implements MenuItem.OnMenuItemClickListener {
private MessageItem mMsgItem;
public MsgListMenuClickListener(MessageItem msgItem) {
mMsgItem = msgItem;
}
@Override
public boolean onMenuItemClick(MenuItem item) {
if (mMsgItem == null) {
return false;
}
switch (item.getItemId()) {
case MENU_EDIT_MESSAGE:
editMessageItem(mMsgItem);
drawBottomPanel();
return true;
case MENU_COPY_MESSAGE_TEXT:
copyToClipboard(mMsgItem.mBody);
return true;
case MENU_FORWARD_MESSAGE:
if (mMsgItem.isMms() && !isAllowForwardMessage(mMsgItem)) {
Toast.makeText(ComposeMessageActivity.this,
R.string.forward_size_over, Toast.LENGTH_SHORT).show();
return false;
}
forwardMessage(mMsgItem);
return true;
case MENU_RESEND:
resendMessage(mMsgItem);
return true;
case MENU_VIEW_SLIDESHOW:
MessageUtils.viewMmsMessageAttachment(ComposeMessageActivity.this,
ContentUris.withAppendedId(Mms.CONTENT_URI, mMsgItem.mMsgId), null,
getAsyncDialog());
return true;
case MENU_VIEW_MESSAGE_DETAILS:
return showMessageDetails(mMsgItem);
case MENU_DELETE_MESSAGE: {
DeleteMessageListener l = new DeleteMessageListener(mMsgItem);
confirmDeleteDialog(l, mMsgItem.mLocked);
return true;
}
case MENU_DELIVERY_REPORT:
showDeliveryReport(mMsgItem.mMsgId, mMsgItem.mType);
return true;
case MENU_COPY_TO_SDCARD: {
int resId = copyMedia(mMsgItem.mMsgId) ? R.string.copy_to_sdcard_success :
R.string.copy_to_sdcard_fail;
Toast.makeText(ComposeMessageActivity.this, resId, Toast.LENGTH_SHORT).show();
return true;
}
case MENU_SAVE_RINGTONE: {
int resId = getDrmMimeSavedStringRsrc(mMsgItem.mIsDrmRingtoneWithRights,
saveRingtone(mMsgItem.mMsgId));
Toast.makeText(ComposeMessageActivity.this, resId, Toast.LENGTH_SHORT).show();
return true;
}
case MENU_LOCK_MESSAGE: {
lockMessage(mMsgItem, true);
return true;
}
case MENU_UNLOCK_MESSAGE: {
lockMessage(mMsgItem, false);
return true;
}
case MENU_COPY_EXTRACT_URL:
String copyedUrl = item.getIntent().getStringExtra("copyurl");
copyToClipboard(copyedUrl);
return true;
case MENU_COPY_TO_SIM: {
if (MessageUtils.getActivatedIccCardCount() > 1) {
showCopySelectDialog(mMsgItem);
} else if (MessageUtils.isMultiSimEnabledMms()) {
new Thread(new CopyToSimThread(mMsgItem,
MessageUtils.isIccCardActivated(MessageUtils.SUB1) ?
MessageUtils.SUB1 : MessageUtils.SUB2)).start();
} else {
new Thread(new CopyToSimThread(mMsgItem)).start();
}
return true;
}
case MENU_SELECT_COPY_MESSAGE_TEXT:
AdapterView.AdapterContextMenuInfo info;
try {
info = (AdapterView.AdapterContextMenuInfo) item.getMenuInfo();
} catch (ClassCastException exception) {
Log.e(TAG, "Bad menuInfo.", exception);
return false;
}
final Cursor cursor = (Cursor) mMsgListAdapter.getItem(info.position);
if (mMsgItem.isSms()) {
showSmsMessageContent(cursor);
} else {
MessageUtils.viewMmsMessageAttachment(ComposeMessageActivity.this,
ContentUris.withAppendedId(Mms.CONTENT_URI, mMsgItem.mMsgId), null,
getAsyncDialog());
}
return true;
default:
return false;
}
}
}
上述代码<TAG 1-1>中，调用copyMedia（）方法<TAG 1-2>代码如下：
private boolean copyMedia(long msgId) {
boolean result = true;
PduBody body = null;
try {
body = SlideshowModel.getPduBody(this,
ContentUris.withAppendedId(Mms.CONTENT_URI, msgId));
} catch (MmsException e) {
Log.e(TAG, "copyMedia can't load pdu body: " + msgId);
}
if (body == null) {
return false;
}
int partNum = body.getPartsNum();
for(int i = 0; i < partNum; i++) {
PduPart part = body.getPart(i);
// all parts have to be successful for a valid result.
result &= copyPart(part, Long.toHexString(msgId));
}
return result;
上述代码<TAG 1-2>中，调用copyPart（）方法<TAG 1-3>代码如下：
private boolean copyPart(PduPart part, String fallback) {
Uri uri = part.getDataUri();
String type = new String(part.getContentType());
boolean isDrm = DrmUtils.isDrmType(type);
if (isDrm) {
type = MmsApp.getApplication().getDrmManagerClient()
.getOriginalMimeType(part.getDataUri());
}
if (!ContentType.isImageType(type)
&& !ContentType.isVideoType(type)
&& !ContentType.isAudioType(type)
&& !(ContentType.TEXT_VCARD.toLowerCase().equals(type.toLowerCase()))
&& !(ContentType.AUDIO_OGG.toLowerCase().equals(type.toLowerCase()))) {
return true; // we only save pictures, videos, and sounds. Skip the text parts,
// the app (smil) parts, and other type that we can't handle.
// Return true to pretend that we successfully saved the part so
// the whole save process will be counted a success.
}
InputStream input = null;
FileOutputStream fout = null;
try {
input = mContentResolver.openInputStream(uri);
if (input instanceof FileInputStream) {
FileInputStream fin = (FileInputStream) input;
byte[] location = part.getName();
if (location == null) {
location = part.getFilename();
}
if (location == null) {
location = part.getContentLocation();
}
String fileName;
if (location == null) {
// Use fallback name.
fileName = fallback;
} else {
// For locally captured videos, fileName can end up being something like this:
// /mnt/sdcard/Android/data/com.android.mms/cache/.temp1.3gp
fileName = new String(location);
}
File originalFile = new File(fileName);
fileName = originalFile.getName(); // Strip the full path of where the "part" is
// stored down to just the leaf filename.
Log.d("bill","utf--"+(new String(location,"gb2312")+"--dd--"+(new String(location))));
Log.d("bill","fileName--"+fileName);
// Depending on the location, there may be an
// extension already on the name or not. If we've got audio, put the attachment
// in the Ringtones directory.
String dir = Environment.getExternalStorageDirectory() + "/"
+ (ContentType.isAudioType(type) ? Environment.DIRECTORY_RINGTONES :
Environment.DIRECTORY_DOWNLOADS) + "/";
String extension;
int index;
if ((index = fileName.lastIndexOf('.')) == -1) {
extension = MimeTypeMap.getSingleton().getExtensionFromMimeType(type);
} else {
extension = fileName.substring(index + 1, fileName.length());
fileName = fileName.substring(0, index);
}
if (isDrm) {
extension += DrmUtils.getConvertExtension(type);
}
// Remove leading periods. The gallery ignores files starting with a period.
fileName = fileName.replaceAll("^\.", "");
File file = getUniqueDestination(dir + fileName, extension);
// make sure the path is valid and directories created for this file.
File parentFile = file.getParentFile();
if (!parentFile.exists() && !parentFile.mkdirs()) {
Log.e(TAG, "[MMS] copyPart: mkdirs for " + parentFile.getPath() + " failed!");
return false;
}
fout = new FileOutputStream(file);
byte[] buffer = new byte[8000];
int size = 0;
while ((size=fin.read(buffer)) != -1) {
fout.write(buffer, 0, size);
}
// Notify other applications listening to scanner events
// that a media file has been added to the sd card
sendBroadcast(new Intent(Intent.ACTION_MEDIA_SCANNER_SCAN_FILE,
Uri.fromFile(file)));
}
} catch (IOException e) {
// Ignore
Log.e("bill", "IOException caught while opening or reading stream", e);
return false;
} finally {
if (null != input) {
try {
input.close();
} catch (IOException e) {
// Ignore
Log.e(TAG, "IOException caught while closing stream", e);
return false;
}
}
if (null != fout) {
try {
fout.close();
} catch (IOException e) {
// Ignore
Log.e(TAG, "IOException caught while closing stream", e);
return false;
}
}
}
return true;
}
上述代码<TAG 1-3>中，调用PduPart.java类中的getName()
public byte[] getName() {
return (byte[]) mPartHeader.get(P_NAME);
}
因此我们分析setName（）方法：
public void setName(byte[] name) {
android.util.Log.d("bill",android.util.Log.getStackTraceString(new Throwable()));
if(null == name) {
throw new NullPointerException("null content-id");
}
mPartHeader.put(P_NAME, name);
}通过打印堆栈我们进行代码追溯：
06-03 17:29:02.759 D/bill ( 1320): java.lang.Throwable
06-03 17:29:02.759 D/bill ( 1320): at com.google.android.mms.pdu.PduPart.setName(PduPart.java:342)
06-03 17:29:02.759 D/bill ( 1320): at com.google.android.mms.pdu.PduPersister.loadParts(PduPersister.java:440)
06-03 17:29:02.759 D/bill ( 1320): at com.google.android.mms.pdu.PduPersister.load(PduPersister.java:632)
分析PduPersister.java类中的loadParts（）方法<TAG 1-4>：private PduPart[] loadParts(long msgId) throws MmsException {
Cursor c = SqliteWrapper.query(mContext, mContentResolver,
Uri.parse("content://mms/" + msgId + "/part"),
PART_PROJECTION, null, null, null);
PduPart[] parts = null;
try {
if ((c == null) || (c.getCount() == 0)) {
if (LOCAL_LOGV) {
Log.v(TAG, "loadParts(" + msgId + "): no part to load.");
}
return null;
}
int partCount = c.getCount();
int partIdx = 0;
parts = new PduPart[partCount];
while (c.moveToNext()) {
PduPart part = new PduPart();
Integer charset = getIntegerFromPartColumn(
c, PART_COLUMN_CHARSET);
if (charset != null) {
part.setCharset(charset);
}
byte[] contentDisposition = getByteArrayFromPartColumn(
c, PART_COLUMN_CONTENT_DISPOSITION);
if (contentDisposition != null) {
part.setContentDisposition(contentDisposition);
}
byte[] contentId = getByteArrayFromPartColumn(
c, PART_COLUMN_CONTENT_ID);
if (contentId != null) {
part.setContentId(contentId);
}
byte[] contentLocation = getByteArrayFromPartColumn(
c, PART_COLUMN_CONTENT_LOCATION);
if (contentLocation != null) {
part.setContentLocation(contentLocation);
}
byte[] contentType = getByteArrayFromPartColumn(
c, PART_COLUMN_CONTENT_TYPE);
if (contentType != null) {
part.setContentType(contentType);
} else {
throw new MmsException("Content-Type must be set.");
}
byte[] fileName = getByteArrayFromPartColumn(
c, PART_COLUMN_FILENAME);
if (fileName != null) {
part.setFilename(fileName);
}
byte[] name = getByteArrayFromPartColumn(
c, PART_COLUMN_NAME);
if (name != null) {
part.setName(name);
}
// Construct a Uri for this part.
long partId = c.getLong(PART_COLUMN_ID);
Uri partURI = Uri.parse("content://mms/part/" + partId);
part.setDataUri(partURI);
// For images/audio/video, we won't keep their data in Part
// because their renderer accept Uri as source.
String type = toIsoString(contentType);
if (!ContentType.isImageType(type)
&& !ContentType.isAudioType(type)
&& !ContentType.isVideoType(type)) {
ByteArrayOutputStream baos = new ByteArrayOutputStream();
InputStream is = null;
// Store simple string values directly in the database instead of an
// external file. This makes the text searchable and retrieval slightly
// faster.
if (ContentType.TEXT_PLAIN.equals(type) || ContentType.APP_SMIL.equals(type)
|| ContentType.TEXT_HTML.equals(type)) {
String text = c.getString(PART_COLUMN_TEXT);
byte [] blob = new EncodedStringValue(text != null ? text : "")
.getTextString();
baos.write(blob, 0, blob.length);
} else {
try {
is = mContentResolver.openInputStream(partURI);
byte[] buffer = new byte[256];
int len = is.read(buffer);
while (len >= 0) {
baos.write(buffer, 0, len);
len = is.read(buffer);
}
} catch (IOException e) {
Log.e(TAG, "Failed to load part data", e);
c.close();
throw new MmsException(e);
} finally {
if (is != null) {
try {
is.close();
} catch (IOException e) {
Log.e(TAG, "Failed to close stream", e);
} // Ignore
}
}
}
part.setData(baos.toByteArray());
}
parts[partIdx++] = part;
}
} finally {
if (c != null) {
c.close();
}
}
return parts;
}
上述代码<TAG 1-4>中,从如下的代码我们可以发现，这里从数据库中取出数据，并对数据进行了编码，从上一篇博客中我们可以了解，我们已经对字节数组进行了处理，也就是说数据不再是单一的ISO_8895-1编码，而是数据的原始编码。这里则不用再对数据进行处理。
private byte[] getByteArrayFromPartColumn(Cursor c, int columnIndex) {
if (!c.isNull(columnIndex)) {
return getBytes(c.getString(columnIndex));
}
return null;
}
public static byte[] getBytes(String data) {<TAG 1-5>
try {
return data.getBytes(CharacterSets.MIMENAME_ISO_8859_1);
} catch (UnsupportedEncodingException e) {
// Impossible to reach here!
Log.e(TAG, "ISO_8859_1 must be supported!", e);
return new byte[0];
}
}
代码<TAG 1-5>修改如下，
public static byte[] getBytes(String data) {<TAG 1-5>
return data.getBytes(CharacterSets.MIMENAME_ISO_8859_1);
}乱码问题搞定，这附件不能保存的问题，迎刃而解。