Use okio with AttachmentTempFileProvider

robolectricVersion=3.1.1

junitVersion=4.12

mockitoVersion=1.10.19

okioVersion=1.11.0

    androidTestCompile 'com.android.support.test:runner:0.4.1'

    androidTestCompile 'com.madgag.spongycastle:pg:1.51.0.0'

    testCompile 'com.squareup.okio:okio:1.6.0'

    testCompile "com.squareup.okio:okio:${okioVersion}"

    testCompile "org.robolectric:robolectric:${robolectricVersion}"

    testCompile "junit:junit:${junitVersion}"

    testCompile "org.mockito:mockito-core:${mockitoVersion}"

    compile project(':plugins:Android-PullToRefresh:library')

    compile project(':plugins:HoloColorPicker')

    compile project(':plugins:openpgp-api-lib:openpgp-api')

    compile "com.squareup.okio:okio:${okioVersion}"

    compile 'commons-io:commons-io:2.4'

    compile "com.android.support:support-v4:${androidSupportLibraryVersion}"

    compile 'net.sourceforge.htmlcleaner:htmlcleaner:2.16'

import java.io.FileOutputStream;

import java.io.IOException;

import java.io.InputStream;

import java.security.MessageDigest;

import java.security.NoSuchAlgorithmException;

import java.util.Date;

import java.util.Locale;

import com.fsck.k9.BuildConfig;

import com.fsck.k9.K9;

import com.fsck.k9.mail.filter.Hex;

import okio.ByteString;

import org.apache.commons.io.IOUtils;

    }

    private static String getTempFilenameForUri(Uri uri) {

        try {

            byte[] digest = MessageDigest.getInstance("SHA-1").digest(uri.toString().getBytes());

            return new String(Hex.encodeHex(digest));

        } catch (NoSuchAlgorithmException e) {

            throw new AssertionError(e);

        }

        return ByteString.encodeUtf8(uri.toString()).sha1().hex();

    }

    private static void writeUriContentToTempFileIfNotExists(Context context, Uri uri, File tempFile)