从Android源码剖析Intent查询匹配的实现

 private void startExplicitIntentWithComponent() { Intent intent = new Intent(); ComponentName component = new ComponentName("com.example.photocrop", "com.example.photocrop.MainActivity"); intent.setComponent(component); startActivity(intent); } private void startExplicitIntentWithClassName() { Intent intent = new Intent(); intent.setClassName("com.example.photocrop", "com.example.photocrop.MainActivity"); startActivity(intent); } 

 public Intent setClassName(String packageName, String className) { mComponent = new ComponentName(packageName, className); return this; } 

 private void startImplictIntent() { Intent intent = new Intent(); intent.setAction("justaction"); intent.addCategory("justcategory"); startActivity(intent); } 

 // 处理该package的activity信息 N = pkg.activities.size(); r = null; for (i = 0; i 

 public final void addActivity(PackageParser.Activity a, String type) { final boolean systemApp = isSystemApp(a.info.applicationInfo); mActivities.put(a.getComponentName(), a); final int NI = a.intents.size(); for (int j = 0; j  0 && "activity".equals(type)) { // 非系统APK的priority必须为0 intent.setPriority(0); } addFilter(intent); } } 

 public void addFilter(F f) { // mFilters保存所有IntentFilter信息 mFilters.add(f); int numS = register_intent_filter(f, f.schemesIterator(), mSchemeToFilter, "   Scheme: "); int numT = register_mime_types(f, "   Type: "); if (numS == 0 && numT == 0) { register_intent_filter(f, f.actionsIterator(), mActionToFilter, "   Action: "); } if (numT != 0) { register_intent_filter(f, f.actionsIterator(), mTypedActionToFilter, "   TypedAction: "); } } 

 private final int register_intent_filter(F filter, Iterator i, ArrayMap dest, String prefix) { if (i == null) { return 0; } int num = 0; while (i.hasNext()) { String name = i.next(); num++; addFilter(dest, name, filter); } return num; } 

 private final void addFilter(ArrayMap map, String name, F filter) { F[] array = map.get(name); if (array == null) { array = newArray(2); map.put(name, array); array[0] = filter; } else { final int N = array.length; int i = N; while (i > 0 && array[i-1] == null) { i--; } if (i 

 @Override public List queryIntentActivities(Intent intent, int flags) { return queryIntentActivitiesAsUser(intent, flags, mContext.getUserId()); } /** @hide Same as above but for a specific user */ @Override public List queryIntentActivitiesAsUser(Intent intent, int flags, int userId) { try { return mPM.queryIntentActivities( intent, intent.resolveTypeIfNeeded(mContext.getContentResolver()), flags, userId); } catch (RemoteException e) { throw new RuntimeException("Package manager has died", e); } } 

 public List queryIntentActivities(Intent intent, String resolvedType, int flags, int userId) { if (!sUserManager.exists(userId)) return Collections.emptyList(); enforceCrossUserPermission(Binder.getCallingUid(), userId, false, "query intent activities"); ComponentName comp = intent.getComponent(); if (comp == null) { if (intent.getSelector() != null) { intent = intent.getSelector(); comp = intent.getComponent(); } } if (comp != null) { // Explicit的Intent，直接根据component得到对应的ActivityInfo final List list = new ArrayList(1); final ActivityInfo ai = getActivityInfo(comp, flags, userId); if (ai != null) { final ResolveInfo ri = new ResolveInfo(); ri.activityInfo = ai; list.add(ri); } return list; } // reader synchronized (mPackages) { final String pkgName = intent.getPackage(); if (pkgName == null) { // Implicit Intent return mActivities.queryIntent(intent, resolvedType, flags, userId); } final PackageParser.Package pkg = mPackages.get(pkgName); if (pkg != null) { // 指定了包名的Intent return mActivities.queryIntentForPackage(intent, resolvedType, flags, pkg.activities, userId); } return new ArrayList(); } } 

 public List queryIntent(Intent intent, String resolvedType, int flags, int userId) { if (!sUserManager.exists(userId)) return null; mFlags = flags; return super.queryIntent(intent, resolvedType, (flags & PackageManager.MATCH_DEFAULT_ONLY) != 0, userId); } 

 public List queryIntent(Intent intent, String resolvedType, boolean defaultOnly, int userId) { String scheme = intent.getScheme(); ArrayList finalList = new ArrayList(); // 最多有4轮匹配操作 F[] firstTypeCut = null; F[] secondTypeCut = null; F[] thirdTypeCut = null; F[] schemeCut = null; // If the intent includes a MIME type, then we want to collect all of // the filters that match that MIME type. if (resolvedType != null) { int slashpos = resolvedType.indexOf('/'); if (slashpos > 0) { final String baseType = resolvedType.substring(0, slashpos); if (!baseType.equals("*")) { if (resolvedType.length() != slashpos+2 || resolvedType.charAt(slashpos+1) != '*') { // Not a wild card, so we can just look for all filters that // completely match or wildcards whose base type matches. firstTypeCut = mTypeToFilter.get(resolvedType); secondTypeCut = mWildTypeToFilter.get(baseType); } else { // We can match anything with our base type. firstTypeCut = mBaseTypeToFilter.get(baseType); secondTypeCut = mWildTypeToFilter.get(baseType); } // Any */* types always apply, but we only need to do this // if the intent type was not already */*. thirdTypeCut = mWildTypeToFilter.get("*"); } else if (intent.getAction() != null) { // The intent specified any type ({@literal *}/*). This // can be a whole heck of a lot of things, so as a first // cut let's use the action instead. firstTypeCut = mTypedActionToFilter.get(intent.getAction()); } } } // If the intent includes a data URI, then we want to collect all of // the filters that match its scheme (we will further refine matches // on the authority and path by directly matching each resulting filter). if (scheme != null) { schemeCut = mSchemeToFilter.get(scheme); } // If the intent does not specify any data -- either a MIME type or // a URI -- then we will only be looking for matches against empty // data. if (resolvedType == null && scheme == null && intent.getAction() != null) { firstTypeCut = mActionToFilter.get(intent.getAction()); } FastImmutableArraySet categories = getFastIntentCategories(intent); if (firstTypeCut != null) { buildResolveList(intent, categories, debug, defaultOnly, resolvedType, scheme, firstTypeCut, finalList, userId); } if (secondTypeCut != null) { buildResolveList(intent, categories, debug, defaultOnly, resolvedType, scheme, secondTypeCut, finalList, userId); } if (thirdTypeCut != null) { buildResolveList(intent, categories, debug, defaultOnly, resolvedType, scheme, thirdTypeCut, finalList, userId); } if (schemeCut != null) { buildResolveList(intent, categories, debug, defaultOnly, resolvedType, scheme, schemeCut, finalList, userId); } sortResults(finalList); return finalList; }