Java tutorial
/* * Copyright (C) 2015 Dominik Schrmann <dominik@dominikschuermann.de> * * This program is free software: you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation, either version 3 of the License, or * (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program. If not, see <http://www.gnu.org/licenses/>. */ package org.sufficientlysecure.keychain.ui; import android.content.Intent; import android.database.Cursor; import android.graphics.Typeface; import android.net.Uri; import android.os.Bundle; import android.support.v4.app.LoaderManager; import android.support.v4.content.CursorLoader; import android.support.v4.content.Loader; import android.view.LayoutInflater; import android.view.View; import android.view.ViewGroup; import android.widget.TextView; import org.sufficientlysecure.keychain.Constants; import org.sufficientlysecure.keychain.R; import org.sufficientlysecure.keychain.pgp.exception.PgpKeyNotFoundException; import org.sufficientlysecure.keychain.experimental.SentenceConfirm; import org.sufficientlysecure.keychain.provider.KeychainContract.KeyRings; import org.sufficientlysecure.keychain.provider.ProviderHelper; import org.sufficientlysecure.keychain.ui.base.LoaderFragment; import org.sufficientlysecure.keychain.ui.util.KeyFormattingUtils; import org.sufficientlysecure.keychain.util.Log; import java.io.IOException; public class CertifyFingerprintFragment extends LoaderFragment implements LoaderManager.LoaderCallbacks<Cursor> { static final int REQUEST_CERTIFY = 1; public static final String ARG_DATA_URI = "uri"; public static final String ARG_ENABLE_PHRASES_CONFIRM = "enable_word_confirm"; private TextView mActionYes; private TextView mFingerprint; private TextView mIntro; private TextView mHeader; private static final int LOADER_ID_UNIFIED = 0; private Uri mDataUri; private boolean mEnablePhrasesConfirm; /** * Creates new instance of this fragment */ public static CertifyFingerprintFragment newInstance(Uri dataUri, boolean enablePhrasesConfirm) { CertifyFingerprintFragment frag = new CertifyFingerprintFragment(); Bundle args = new Bundle(); args.putParcelable(ARG_DATA_URI, dataUri); args.putBoolean(ARG_ENABLE_PHRASES_CONFIRM, enablePhrasesConfirm); frag.setArguments(args); return frag; } @Override public View onCreateView(LayoutInflater inflater, ViewGroup superContainer, Bundle savedInstanceState) { View root = super.onCreateView(inflater, superContainer, savedInstanceState); View view = inflater.inflate(R.layout.certify_fingerprint_fragment, getContainer()); TextView actionNo = (TextView) view.findViewById(R.id.certify_fingerprint_button_no); mActionYes = (TextView) view.findViewById(R.id.certify_fingerprint_button_yes); mFingerprint = (TextView) view.findViewById(R.id.certify_fingerprint_fingerprint); mIntro = (TextView) view.findViewById(R.id.certify_fingerprint_intro); mHeader = (TextView) view.findViewById(R.id.certify_fingerprint_fingerprint_header); actionNo.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { getActivity().finish(); } }); mActionYes.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { certify(mDataUri); } }); return root; } @Override public void onActivityCreated(Bundle savedInstanceState) { super.onActivityCreated(savedInstanceState); Uri dataUri = getArguments().getParcelable(ARG_DATA_URI); if (dataUri == null) { Log.e(Constants.TAG, "Data missing. Should be Uri of key!"); getActivity().finish(); return; } mEnablePhrasesConfirm = getArguments().getBoolean(ARG_ENABLE_PHRASES_CONFIRM); if (mEnablePhrasesConfirm) { mIntro.setText(R.string.certify_fingerprint_text_phrases); mHeader.setText(R.string.section_phrases); mActionYes.setText(R.string.btn_match_phrases); } loadData(dataUri); } private void loadData(Uri dataUri) { mDataUri = dataUri; Log.i(Constants.TAG, "mDataUri: " + mDataUri.toString()); // Prepare the loaders. Either re-connect with an existing ones, // or start new ones. getLoaderManager().initLoader(LOADER_ID_UNIFIED, null, this); } static final String[] UNIFIED_PROJECTION = new String[] { KeyRings._ID, KeyRings.FINGERPRINT, }; static final int INDEX_UNIFIED_FINGERPRINT = 1; public Loader<Cursor> onCreateLoader(int id, Bundle args) { setContentShown(false); switch (id) { case LOADER_ID_UNIFIED: { Uri baseUri = KeyRings.buildUnifiedKeyRingUri(mDataUri); return new CursorLoader(getActivity(), baseUri, UNIFIED_PROJECTION, null, null, null); } default: return null; } } public void onLoadFinished(Loader<Cursor> loader, Cursor data) { /* TODO better error handling? May cause problems when a key is deleted, * because the notification triggers faster than the activity closes. */ // Avoid NullPointerExceptions... if (data.getCount() == 0) { return; } // Swap the new cursor in. (The framework will take care of closing the // old cursor once we return.) switch (loader.getId()) { case LOADER_ID_UNIFIED: { if (data.moveToFirst()) { byte[] fingerprintBlob = data.getBlob(INDEX_UNIFIED_FINGERPRINT); if (mEnablePhrasesConfirm) { displayWordConfirm(fingerprintBlob); } else { displayHexConfirm(fingerprintBlob); } break; } } } setContentShown(true); } private void displayHexConfirm(byte[] fingerprintBlob) { String fingerprint = KeyFormattingUtils.convertFingerprintToHex(fingerprintBlob); mFingerprint.setText(KeyFormattingUtils.colorizeFingerprint(fingerprint)); } private void displayWordConfirm(byte[] fingerprintBlob) { // String fingerprint = ExperimentalWordConfirm.getWords(getActivity(), fingerprintBlob); String fingerprint; try { fingerprint = new SentenceConfirm(getActivity()).fromBytes(fingerprintBlob, 20); } catch (IOException e) { fingerprint = "-"; Log.e(Constants.TAG, "Problem when creating sentence!", e); } mFingerprint.setTextSize(18); mFingerprint.setTypeface(Typeface.DEFAULT, Typeface.BOLD); mFingerprint.setText(fingerprint); } /** * This is called when the last Cursor provided to onLoadFinished() above is about to be closed. * We need to make sure we are no longer using it. */ public void onLoaderReset(Loader<Cursor> loader) { } private void certify(Uri dataUri) { long keyId = 0; try { keyId = new ProviderHelper(getActivity()).getCachedPublicKeyRing(dataUri).extractOrGetMasterKeyId(); } catch (PgpKeyNotFoundException e) { Log.e(Constants.TAG, "key not found!", e); } Intent certifyIntent = new Intent(getActivity(), CertifyKeyActivity.class); certifyIntent.putExtras(getActivity().getIntent()); certifyIntent.putExtra(CertifyKeyActivity.EXTRA_KEY_IDS, new long[] { keyId }); startActivityForResult(certifyIntent, REQUEST_CERTIFY); } @Override public void onActivityResult(int requestCode, int resultCode, Intent data) { // always just pass this one through if (requestCode == REQUEST_CERTIFY) { getActivity().setResult(resultCode, data); getActivity().finish(); return; } super.onActivityResult(requestCode, resultCode, data); } }