ExceptionInInitializerError about androidbox

[zengjingfang]

源码追踪

    public static File getExternalStorageDirectory() {
        throwIfUserRequired();
        return sCurrentUser.getExternalDirs()[0];
    }

public File[] getExternalDirs() {
            final StorageVolume[] volumes = StorageManager.getVolumeList(mUserId,
                    StorageManager.FLAG_FOR_WRITE);
            final File[] files = new File[volumes.length];
            for (int i = 0; i < volumes.length; i++) {
                files[i] = volumes[i].getPathFile();
            }
            return files;
        }

public static @NonNull StorageVolume[] getVolumeList(int userId, int flags) {
        final IStorageManager storageManager = IStorageManager.Stub.asInterface(
                ServiceManager.getService("mount"));
        try {
            String packageName = ActivityThread.currentOpPackageName();
            if (packageName == null) {
                // Package name can be null if the activity thread is running but the app
                // hasn't bound yet. In this case we fall back to the first package in the
                // current UID. This works for runtime permissions as permission state is
                // per UID and permission realted app ops are updated for all UID packages.
                String[] packageNames = ActivityThread.getPackageManager().getPackagesForUid(
                        android.os.Process.myUid());
                if (packageNames == null || packageNames.length <= 0) {
                    return new StorageVolume[0];
                }
                packageName = packageNames[0];
            }
            final int uid = ActivityThread.getPackageManager().getPackageUid(packageName,
                    PackageManager.MATCH_DEBUG_TRIAGED_MISSING, userId);
            if (uid <= 0) {
                return new StorageVolume[0];
            }
            return storageManager.getVolumeList(uid, packageName, flags);
        } catch (RemoteException e) {
            throw e.rethrowFromSystemServer();
        }
    }

[zengjingfang]

原因

静态变量初始化时出现异常则会抛出ExceptionInInitializerError，这个是因为getExternalStorageDirectory内部抛出了异常DeadObjectException，从而导致抛出ExceptionInInitializerError。

private static final String SDCARD_DIR = Environment.getExternalStorageDirectory().getPath() + "/im/";