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【测试结果】：添加时弹出提示“unsupported video format”
该问题主要提现在手机彩信视频附件不支持该AVI格式的视频，因此我们通过操作流程对代码进行追踪，查找“unsupported video format”产生的位置。
我们从添加附件界面ComposeMessageActivity类的onActivityResult（）方法开始。
--》onActivityResult（）调用代码如下：
case REQUEST_CODE_ATTACH_VIDEO:
if (data != null) {
mAttachFileUri = data.getData();
addVideoAsync(mAttachFileUri, false);
}
break;
--》addVideo（）--》setAttachment（）<WorkingMessage.java> 调用代码如下：
result = append ? appendMedia(type, dataUri, slideShowEditor)
: changeMedia(type, dataUri, slideShowEditor);
--》changeMedia（）--》internalChangeMedia（）--》changeVideo（）<SlideshowEditor.java>
--》new VideoModel（）<TAG 1-1>
public VideoModel(Context context, Uri uri, RegionModel region)
throws MmsException {
this(context, null, null, uri, region);
initModelFromUri(uri);
checkContentRestriction();
}
--》initModelFromUri（）<VideoModel.java> 调用代码如下：
private void initModelFromUri(Uri uri) throws MmsException {
String scheme = uri.getScheme();
if (scheme.equals("content")) {
initFromContentUri(uri);
} else if (uri.getScheme().equals("file")) {
initFromFile(uri);
}
initMediaDuration();
}
上述代码通过添加Log进行输出，这里的scheme的值为“file”；
--》initFromFile（）
private void initFromFile(Uri uri) throws MmsException {
String path = uri.getPath();
mSrc = path.substring(path.lastIndexOf('/') + 1);
MimeTypeMap mimeTypeMap = MimeTypeMap.getSingleton();
String extension = MimeTypeMap.getFileExtensionFromUrl(mSrc);
if (TextUtils.isEmpty(extension)) {
// getMimeTypeFromExtension() doesn't handle spaces in filenames nor can it handle
// urlEncoded strings. Let's try one last time at finding the extension.
int dotPos = mSrc.lastIndexOf('.');
if (0 <= dotPos) {
extension = mSrc.substring(dotPos + 1);
}
}
mContentType = mimeTypeMap.getMimeTypeFromExtension(extension.toLowerCase());
// It's ok if mContentType is null. Eventually we'll show a toast telling the
// user the video couldn't be attached.
if (TextUtils.isEmpty(mContentType)) {
throw new MmsException("Type of media is unknown.");
}
if (Log.isLoggable(LogTag.APP, Log.VERBOSE)) {
Log.v(TAG, "New VideoModel initFromFile created:"
+ " mSrc=" + mSrc
+ " mContentType=" + mContentType
+ " mUri=" + uri);
}
}
上述代码中对mContentType进行赋值,这里我们通过Log输出，mContentType的值为“video/x-msvideo”；
接下来接着进行构造函数<TAG1-1>中的方法checkContentRestriction()；
protected void checkContentRestriction() throws ContentRestrictionException {
ContentRestriction cr = ContentRestrictionFactory.getContentRestriction();
cr.checkVideoContentType(mContentType);
}
--》checkVideoContentType（）<CarrierContentRestriction.java>
public void checkAudioContentType(String contentType)
throws ContentRestrictionException {
if (null == contentType) {
throw new ContentRestrictionException("Null content type to be check");
}
if (!sSupportedAudioTypes.contains(contentType)) {
throw new UnsupportContentTypeException("Unsupported audio content type : "
+ contentType);
}
}
上述代码中加粗标识的代码就是测试描述的问题，我们接着分析本类中静态语句快中的代码；
sSupportedVideoTypes = ContentType.getVideoTypes();
最终我们最终到ContentType.java类，并且发现该类中没有添加对该视频格式的支持。因此添加以下代码进行支持。
......
public static final String VIDEO_UNSPECIFIED = "video/*";
public static final String VIDEO_3GPP = "video/3gpp";
public static final String VIDEO_3G2 = "video/3gpp2";
public static final String VIDEO_H263 = "video/h263";
public static final String VIDEO_MP4 = "video/mp4";
public static final String VIDEO_X_MSVIDEO = "video/x-msvideo";
......
// add supported video types
sSupportedVideoTypes.add(VIDEO_X_MSVIDEO);
sSupportedVideoTypes.add(VIDEO_3GPP);
sSupportedVideoTypes.add(VIDEO_3G2);
sSupportedVideoTypes.add(VIDEO_H263);
sSupportedVideoTypes.add(VIDEO_MP4);
......
OK！