App.java 文件源码

/**
 * {@link PackageManager} doesn't give us {@code minSdkVersion}, {@code targetSdkVersion},
 * and {@code maxSdkVersion}, so we have to parse it straight from {@code <uses-sdk>} in
 * {@code AndroidManifest.xml}.  If {@code targetSdkVersion} is not set, then it is
 * equal to {@code minSdkVersion}
 *
 * @see <a href="https://developer.android.com/guide/topics/manifest/uses-sdk-element.html">&lt;uses-sdk&gt;</a>
 */
private static int[] getMinTargetMaxSdkVersions(Context context, String packageName) {
    int minSdkVersion = Apk.SDK_VERSION_MIN_VALUE;
    int targetSdkVersion = Apk.SDK_VERSION_MIN_VALUE;
    int maxSdkVersion = Apk.SDK_VERSION_MAX_VALUE;
    try {
        AssetManager am = context.createPackageContext(packageName, 0).getAssets();
        XmlResourceParser xml = am.openXmlResourceParser("AndroidManifest.xml");
        int eventType = xml.getEventType();
        while (eventType != XmlPullParser.END_DOCUMENT) {
            if (eventType == XmlPullParser.START_TAG && "uses-sdk".equals(xml.getName())) {
                for (int j = 0; j < xml.getAttributeCount(); j++) {
                    if (xml.getAttributeName(j).equals("minSdkVersion")) {
                        minSdkVersion = Integer.parseInt(xml.getAttributeValue(j));
                    } else if (xml.getAttributeName(j).equals("targetSdkVersion")) {
                        targetSdkVersion = Integer.parseInt(xml.getAttributeValue(j));
                    } else if (xml.getAttributeName(j).equals("maxSdkVersion")) {
                        maxSdkVersion = Integer.parseInt(xml.getAttributeValue(j));
                    }
                }
                break;
            }
            eventType = xml.nextToken();
        }
    } catch (PackageManager.NameNotFoundException | IOException | XmlPullParserException e) {
        Log.e(TAG, "Could not get min/max sdk version", e);
    }
    if (targetSdkVersion < minSdkVersion) {
        targetSdkVersion = minSdkVersion;
    }
    return new int[]{minSdkVersion, targetSdkVersion, maxSdkVersion};
}