Java tutorial
/* * Copyright (C) 2012-2013 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.thialfihar.android.apg.ui.dialog; import android.app.AlertDialog; import android.app.Dialog; import android.content.Context; import android.net.Uri; import android.os.Bundle; import android.support.v4.app.DialogFragment; import android.view.LayoutInflater; import android.view.View; import android.widget.Button; import android.widget.ImageView; import android.widget.TextView; import android.widget.Toast; import org.thialfihar.android.apg.Constants; import org.thialfihar.android.apg.R; import org.thialfihar.android.apg.pgp.KeyRing; import org.thialfihar.android.apg.pgp.PgpKeyHelper; import org.thialfihar.android.apg.provider.ProviderHelper; import org.thialfihar.android.apg.util.QrCodeUtils; import java.io.IOException; import java.util.ArrayList; public class ShareQrCodeDialogFragment extends DialogFragment { private static final String ARG_KEY_URI = "uri"; private static final String ARG_FINGERPRINT_ONLY = "fingerprint_only"; private Context mContext; private ProviderHelper mProvider; private ImageView mImage; private TextView mText; private boolean mFingerprintOnly; private ArrayList<String> mContentList; private int mCounter; private static final int QR_CODE_SIZE = 1000; /** * Creates new instance of this dialog fragment */ public static ShareQrCodeDialogFragment newInstance(Uri dataUri, boolean fingerprintOnly) { ShareQrCodeDialogFragment frag = new ShareQrCodeDialogFragment(); Bundle args = new Bundle(); args.putParcelable(ARG_KEY_URI, dataUri); args.putBoolean(ARG_FINGERPRINT_ONLY, fingerprintOnly); frag.setArguments(args); return frag; } /** * Creates dialog */ @Override public Dialog onCreateDialog(Bundle savedInstanceState) { mContext = getActivity(); mProvider = new ProviderHelper(mContext); Uri dataUri = getArguments().getParcelable(ARG_KEY_URI); mFingerprintOnly = getArguments().getBoolean(ARG_FINGERPRINT_ONLY); AlertDialog.Builder alert = new AlertDialog.Builder(mContext); alert.setTitle(R.string.share_qr_code_dialog_title); LayoutInflater inflater = getActivity().getLayoutInflater(); View view = inflater.inflate(R.layout.share_qr_code_dialog, null); alert.setView(view); mImage = (ImageView) view.findViewById(R.id.share_qr_code_dialog_image); mText = (TextView) view.findViewById(R.id.share_qr_code_dialog_text); String content = null; if (mFingerprintOnly) { alert.setPositiveButton(R.string.btn_okay, null); byte[] fingerprintBlob = ProviderHelper.getFingerprint(mContext, dataUri); String fingerprint = PgpKeyHelper.convertFingerprintToHex(fingerprintBlob); mText.setText(getString(R.string.share_qr_code_dialog_fingerprint_text) + " " + fingerprint); content = Constants.FINGERPRINT_SCHEME + ":" + fingerprint; setQrCode(content); } else { mText.setText(R.string.share_qr_code_dialog_start); // TODO long masterKeyId = ProviderHelper.getMasterKeyId(mContext, dataUri); KeyRing keyRing = mProvider.getPublicKeyRingByMasterKeyId(masterKeyId); try { content = keyRing.getArmoredEncoded(mContext); } catch (IOException e) { Toast.makeText(mContext, R.string.error_could_not_encode_key_ring, Toast.LENGTH_LONG).show(); return null; } // OnClickListener are set in onResume to prevent automatic dismissing of Dialogs // http://bit.ly/O5vfaR alert.setPositiveButton(R.string.btn_next, null); alert.setNegativeButton(android.R.string.cancel, null); mContentList = splitString(content, 1000); // start with first mCounter = 0; updatePartsQrCode(); } return alert.create(); } @Override public void onResume() { super.onResume(); if (!mFingerprintOnly) { AlertDialog alertDialog = (AlertDialog) getDialog(); final Button backButton = alertDialog.getButton(AlertDialog.BUTTON_NEGATIVE); final Button nextButton = alertDialog.getButton(AlertDialog.BUTTON_POSITIVE); backButton.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { if (mCounter > 0) { mCounter--; updatePartsQrCode(); updateDialog(backButton, nextButton); } else { dismiss(); } } }); nextButton.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { if (mCounter < mContentList.size() - 1) { mCounter++; updatePartsQrCode(); updateDialog(backButton, nextButton); } else { dismiss(); } } }); } } private void updatePartsQrCode() { // Content: <counter>,<size>,<content> setQrCode(mCounter + "," + mContentList.size() + "," + mContentList.get(mCounter)); } private void setQrCode(String data) { mImage.setImageBitmap(QrCodeUtils.getQRCodeBitmap(data, QR_CODE_SIZE)); } private void updateDialog(Button backButton, Button nextButton) { if (mCounter == 0) { backButton.setText(android.R.string.cancel); } else { backButton.setText(R.string.btn_back); } if (mCounter == mContentList.size() - 1) { nextButton.setText(android.R.string.ok); } else { nextButton.setText(R.string.btn_next); } mText.setText(getResources().getString(R.string.share_qr_code_dialog_progress, mCounter + 1, mContentList.size())); } /** * Split String by number of characters * * @param text * @param size * @return */ private ArrayList<String> splitString(String text, int size) { ArrayList<String> strings = new ArrayList<String>(); int index = 0; while (index < text.length()) { strings.add(text.substring(index, Math.min(index + size, text.length()))); index += size; } return strings; } }