Android Code Snippet Detecting zip archive corruption

Sub ZipIsValid(PathDir As String, NameFile As String) As Boolean
    Dim MyJO As JavaObject = Me
    Return MyJO.RunMethod("isValid", Array(File.Combine(PathDir, NameFile)))
End Sub

#If JAVA
import java.util.zip.ZipFile;
import java.util.zip.ZipEntry;
import java.util.zip.ZipInputStream;
import java.io.FileInputStream;
import java.io.IOException;
import java.util.zip.ZipException;

public boolean isValid(final String namefile) {
    ZipFile zipfile = null;
    ZipInputStream zis = null;
    try {
        zipfile = new ZipFile(namefile);
        zis = new ZipInputStream(new FileInputStream(namefile));
        ZipEntry ze = zis.getNextEntry();
        if(ze == null) {
            return false;
        }
        while(ze != null) {
            // if it throws an exception fetching any of the following then we know the file is corrupted.
            zipfile.getInputStream(ze);
            ze.getCrc();
            ze.getCompressedSize();
            ze.getName();
            ze = zis.getNextEntry();
        }
        return true;
    } catch (ZipException e) {
        return false;
    } catch (IOException e) {
        return false;
    } finally {
        try {
            if (zipfile != null) {
                zipfile.close();
                zipfile = null;
            }
        } catch (IOException e) {
            return false;
        } try {
            if (zis != null) {
                zis.close();
                zis = null;
            }
        } catch (IOException e) {
            return false;
        }
    }
}
#End If