问题描述：
1.长按一条输入内容为满的彩信，选择转发
2.输入联系人-删除主题FWD-发送
测试结果为：提示正转化为短信（见附件）
预期结果为：不应该有提示，应该还是彩信
测试结果图为：
根据提示的Toast内容“Converting to text message...”进行代码最终进行代码定位到ComposeMessageActivity类的showConvertToSmsToast（）方法，并打印堆栈：
private void showConvertToSmsToast() {
Log.d("bill",Log.getStackTraceString(new Throwable()));
Toast.makeText(this, R.string.converting_to_text_message, Toast.LENGTH_SHORT).show();
}
通过打印堆栈我们可以看出方法的调用流程，我们从下往上来分析到底是哪一个环节除了问题，首先分析ComposeMessageActivity类的onProtocolChanged（）方法：
@Override
public void onProtocolChanged(final boolean convertToMms) {<TAG 1-1>
// Have to make sure we're on the UI thread. This function can be called off of the UI
// thread when we're adding multi-attachments
runOnUiThread(new Runnable() {
@Override
public void run() {
if (mShowTwoButtons) {
showTwoSmsOrMmsSendButton(convertToMms);
} else {
showSmsOrMmsSendButton(convertToMms);
}
if (convertToMms) {
// In the case we went from a long sms with a counter to an mms because
// the user added an attachment or a subject, hide the counter --
// it doesn't apply to mms.
mTextCounter.setVisibility(View.GONE);
if (mShowTwoButtons) {
mTextCounterSec.setVisibility(View.GONE);
}
showConvertToMmsToast();
} else {
mTextCounter.setVisibility(View.VISIBLE);
showConvertToSmsToast();
}
}
});
从上面代码我们分析，当彩信已经发送的时候，该方法不应该在调用，而是应该在输入短息内容的时候进行调用。那我们接着分析WorkingMessage类的updateState（）方法，setSubject（）方法，removeSubjectIfEmpty（）方法，send（）方法和sendMessage（）方法。
private void updateState(int state, boolean on, boolean notify) {<TAG1-2>
if (!sMmsEnabled) {
// If Mms isn't enabled, the rest of the Messaging UI should not be using any
// feature that would cause us to to turn on any Mms flag and show the
// "Converting to multimedia..." message.
return;
}
int oldState = mMmsState;
if (on) {
mMmsState |= state;
} else {
mMmsState &= ~state;
}
// If we are clearing the last bit that is not FORCE_MMS,
// expire the FORCE_MMS bit.
if (mMmsState == FORCE_MMS && ((oldState & ~FORCE_MMS) > 0)) {
mMmsState = 0;
}
// Notify the listener if we are moving from SMS to MMS
// or vice versa.
if (notify) {
if (oldState == 0 && mMmsState != 0) {
mStatusListener.onProtocolChanged(true);
} else if (oldState != 0 && mMmsState == 0) {
mStatusListener.onProtocolChanged(false);
}
}
if (oldState != mMmsState) {
if (Log.isLoggable(LogTag.APP, Log.VERBOSE)) LogTag.debug("updateState: %s%s = %s",
on ? "+" : "-",
stateString(state), stateString(mMmsState));
}
}
public void setSubject(CharSequence s, boolean notify) {<TAG 1-3>
mSubject = s;
updateState(HAS_SUBJECT, (s != null), notify);
if (mSlideshow != null) {
mSlideshow.setSubjectSize((s == null) ? 0 : s.toString().getBytes().length);
}
}
private void removeSubjectIfEmpty(boolean notify) {<TAG1-4>
if (!hasSubject()) {
setSubject(null, notify);
}
}
public void send(final String recipientsInUI) {<TAG1-5>
long origThreadId = mConversation.getThreadId();
if (Log.isLoggable(LogTag.TRANSACTION, Log.VERBOSE)) {
LogTag.debug("send origThreadId: " + origThreadId);
}
removeSubjectIfEmpty(true /* notify */);
// Get ready to write to disk.
prepareForSave(true /* notify */);
// We need the recipient list for both SMS and MMS.
final Conversation conv = mConversation;
String msgTxt = mText.toString();
if (requiresMms() || addressContainsEmailToMms(conv, msgTxt)) {
// uaProfUrl setting in mms_config.xml must be present to send an MMS.
// However, SMS service will still work in the absence of a uaProfUrl address.
if (MmsConfig.getUaProfUrl() == null) {
String err = "WorkingMessage.send MMS sending failure. mms_config.xml is " +
"missing uaProfUrl setting. uaProfUrl is required for MMS service, " +
"but can be absent for SMS.";
RuntimeException ex = new NullPointerException(err);
Log.e(TAG, err, ex);
// now, let's just crash.
throw ex;
}
// Make local copies of the bits we need for sending a message,
// because we will be doing it off of the main thread, which will
// immediately continue on to resetting some of this state.
final Uri mmsUri = mMessageUri;
final PduPersister persister = PduPersister.getPduPersister(mActivity);
final SlideshowModel slideshow = mSlideshow;
final CharSequence subject = mSubject;
final boolean textOnly = mAttachmentType == TEXT;
if (Log.isLoggable(LogTag.TRANSACTION, Log.VERBOSE)) {
LogTag.debug("Send mmsUri: " + mmsUri);
}
// Do the dirty work of sending the message off of the main UI thread.
new Thread(new Runnable() {
@Override
public void run() {
final SendReq sendReq = makeSendReq(conv, subject);
// Make sure the text in slide 0 is no longer holding onto a reference to
// the text in the message text box.
slideshow.prepareForSend();
sendMmsWorker(conv, mmsUri, persister, slideshow, sendReq, textOnly);
updateSendStats(conv);
}
}, "WorkingMessage.send MMS").start();
} else {
// Same rules apply as above.
// add user's signature first if this feature is enabled.
String text = mText.toString();
SharedPreferences sp = PreferenceManager.getDefaultSharedPreferences(mActivity);
if (sp.getBoolean("pref_key_enable_signature", false)) {
String signature = (sp.getString("pref_key_edit_signature", "")).trim();
if (signature.length() > 0) {
String sigBlock = "
" + signature;
if (!text.endsWith(sigBlock)) {
// Signature should be written behind the text in a
// newline while the signature has changed.
text += sigBlock;
}
}
}
final String msgText = text;
new Thread(new Runnable() {
@Override
public void run() {
preSendSmsWorker(conv, msgText, recipientsInUI);
updateSendStats(conv);
}
}, "WorkingMessage.send SMS").start();
}
// update the Recipient cache with the new to address, if it's different
RecipientIdCache.updateNumbers(conv.getThreadId(), conv.getRecipients());
// Mark the message as discarded because it is "off the market" after being sent.
mDiscarded = true;
}
通过对上述代码<TAG 1-3>的方法分析发现，将<TAG 1-3>进行如下修改，问题得到解决。
public void setSubject(CharSequence s, boolean notify) {<TAG 1-3 MOD>
mSubject = s;
if (mSlideshow != null) {
updateState(HAS_SUBJECT, (s != null), false);
mSlideshow.setSubjectSize((s == null) ? 0 : s.toString().getBytes().length);
}else
updateState(HAS_SUBJECT, (s != null), notify);
}
这里的解决思路为：根据当前幻灯片对象是否为空来判断是否有必要更新状态。