GSAState.java 文件源码

/**
 * This is used to check whether GSA package is available to handle search requests and if
 * the Chrome experiment to do so is enabled.
 * @return Whether the search intent this class creates will resolve to an activity.
 */
public boolean isGsaAvailable() {
    if (mGsaAvailable != null) return mGsaAvailable;
    mGsaAvailable = false;
    PackageManager pm = mContext.getPackageManager();
    Intent searchIntent = new Intent(SEARCH_INTENT_ACTION);
    searchIntent.setPackage(GSAState.SEARCH_INTENT_PACKAGE);
    List<ResolveInfo> resolveInfo = pm.queryIntentActivities(searchIntent, 0);
    if (resolveInfo.size() == 0) {
        mGsaAvailable = false;
    } else if (!isPackageAboveVersion(SEARCH_INTENT_PACKAGE, GSA_VERSION_FOR_DOCUMENT)
            || !isPackageAboveVersion(GMS_CORE_PACKAGE, GMS_CORE_VERSION)) {
        mGsaAvailable = false;
    } else {
        mGsaAvailable = true;
    }
    return mGsaAvailable;
}