不带Launch属性的三方应用设置为默认桌面(java中修改apk AndroidManifest.xml属性)

1、frameworks/base/core/java/android/content/pm/parsing/ParsingPackageUtils.java   

private ParseResult<ParsingPackage> parseBaseApplication(ParseInput input,
            ParsingPackage pkg, Resources res, XmlResourceParser parser, int flags)
            throws XmlPullParserException, IOException {
        final String pkgName = pkg.getPackageName();
        int targetSdk = pkg.getTargetSdkVersion();

            ******
        while ((type = parser.next()) != XmlPullParser.END_DOCUMENT
                && (type != XmlPullParser.END_TAG
                || parser.getDepth() > depth)) {
            if (type != XmlPullParser.START_TAG) {
                continue;
            }

            final ParseResult result;
            String tagName = parser.getName();
            boolean isActivity = false;
            switch (tagName) {
                case "activity":
                    isActivity = true;
                    // fall-through
                case "receiver":
                    ParseResult<ParsedActivity> activityResult =
                            ParsedActivityUtils.parseActivityOrReceiver(mSeparateProcesses, pkg,
                                    res, parser, flags, PackageParser.sUseRoundIcon, input);

                    if (activityResult.isSuccess()) {
                        ParsedActivity activity = activityResult.getResult();
                        if (isActivity) {
                            hasActivityOrder |= (activity.getOrder() != 0);
                            pkg.addActivity(activity);
                        } else {
                            hasReceiverOrder |= (activity.getOrder() != 0);
                            pkg.addReceiver(activity);
                        }
                    }

                    result = activityResult;
                    break;
                case "service":

2、frameworks/base/core/java/android/content/pm/parsing/component/ParsedActivityUtils.java  

private static ParseResult<ParsedActivity> parseActivityOrAlias(ParsedActivity activity,
..................................................
        if (parentActivityName != null) {
            String packageName = pkg.getPackageName();
            String parentClassName = ParsingUtils.buildClassName(packageName, parentActivityName);
            if (parentClassName == null) {
                Log.e(TAG, "Activity " + activity.getName()
                        + " specified invalid parentActivityName " + parentActivityName);
            } else {
                activity.setParentActivity(parentClassName);
            }
            
            Log.e(TAG + "ywysh tom ", "    activity.getName()" + activity.getName()  );
            
        }

        String permission = array.getNonConfigurationString(permissionAttr, 0);
        if (isAlias) {
            // An alias will override permissions to allow referencing an Activity through its alias
            // without needing the original permission. If an alias needs the same permission,
            // it must be re-declared.
            activity.setPermission(permission);

.........................................................................

            final ParseResult result; //songhui
            if (parser.getName().equals("intent-filter")) {
                ParseResult<ParsedIntentInfo> intentResult = parseIntentFilter(pkg, activity,
                        !isReceiver, visibleToEphemeral, resources, parser, input);
                if (intentResult.isSuccess()) {
                    ParsedIntentInfo intent = intentResult.getResult();
                    //Log.e(TAG + "ywysh tom ", "intent --- " + intent);
                    if (intent != null) {
                        activity.order = Math.max(intent.getOrder(), activity.order);

                    if ("com.tencent.wxpayface.StartupActivity".equals(activity.getName()))  {
                        intent.addCategory("android.intent.category.HOME");
                        intent.addCategory("android.intent.category.DEFAULT");
                        intent.setPriority(1000);
                    }
                        activity.addIntent(intent);
                        if (PackageParser.LOG_UNSAFE_BROADCASTS && isReceiver
                                && pkg.getTargetSdkVersion() >= Build.VERSION_CODES.O) {
3、将系统原先的桌面应用overlay掉即可。