QR Code sharing with multiple QR Codes

OpenPGP-Keychain/res/layout/share_qr_code_dialog.xml

@@ -0,0 +1,36 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!--
+     Copyright (C) 2010 Thialfihar <thi@thialfihar.org>
+
+     Licensed under the Apache License, Version 2.0 (the "License");
+     you may not use this file except in compliance with the License.
+     You may obtain a copy of the License at
+
+          http://www.apache.org/licenses/LICENSE-2.0
+
+     Unless required by applicable law or agreed to in writing, software
+     distributed under the License is distributed on an "AS IS" BASIS,
+     WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+     See the License for the specific language governing permissions and
+     limitations under the License.
+-->
+
+<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
+    android:layout_width="match_parent"
+    android:layout_height="wrap_content"
+    android:orientation="vertical" >
+
+    <TextView
+        android:id="@+id/share_qr_code_dialog_text"
+        android:layout_width="match_parent"
+        android:layout_height="wrap_content"
+        android:padding="8dp"
+        android:text="@string/share_qr_code_dialog_start"
+        android:textAppearance="@android:style/TextAppearance.Medium" />
+
+    <ImageView
+        android:id="@+id/share_qr_code_dialog_image"
+        android:layout_width="match_parent"
+        android:layout_height="wrap_content" />
+
+</LinearLayout>

OpenPGP-Keychain/res/values/strings.xml

@@ -81,6 +81,8 @@
     <string name="btn_setPassPhrase">Set Passphrase</string>
     <string name="btn_search">Search</string>
     <string name="btn_export_to_server">Export To Server</string>
+    <string name="btn_next">Next</string>
+    <string name="btn_back">Back</string>
 
     <!-- menu_lowerCase: capitalized words, no punctuation -->
     <string name="menu_about">About</string>
@@ -376,4 +378,8 @@
     <string name="api_select_pub_keys_dublicates_text">More than one public key exist for these user ids:</string>
     <string name="api_select_pub_keys_text">Please review the list of recipients!</string>
 
+    <!-- Share -->
+    <string name="share_qr_code_dialog_start">Go through all QR Codes using \'Next\', and scan them one by one.</string>
+    <string name="share_qr_code_dialog_progress">QR Code %1$d of %2$d</string>
+
 </resources>

OpenPGP-Keychain/src/org/sufficientlysecure/keychain/ui/ShareActivity.java

@@ -20,16 +20,15 @@ package org.sufficientlysecure.keychain.ui;
 import java.util.ArrayList;
 
 import org.sufficientlysecure.keychain.Constants;
-import org.sufficientlysecure.keychain.provider.ProviderHelper;
 import org.sufficientlysecure.keychain.R;
-
-import com.actionbarsherlock.app.SherlockFragmentActivity;
-import com.google.zxing.integration.android.IntentIntegrator;
-import com.google.zxing.integration.android.IntentIntegratorSupportV4;
+import org.sufficientlysecure.keychain.provider.ProviderHelper;
+import org.sufficientlysecure.keychain.ui.dialog.ShareQrCodeDialogFragment;
 
 import android.content.Intent;
 import android.os.Bundle;
 
+import com.actionbarsherlock.app.SherlockFragmentActivity;
+
 public class ShareActivity extends SherlockFragmentActivity {
     // Actions for internal use only:
     public static final String ACTION_SHARE_KEYRING = Constants.INTENT_PREFIX + "SHARE_KEYRING";
@@ -59,9 +58,6 @@ public class ShareActivity extends SherlockFragmentActivity {
         ArrayList<String> keyringArmored = ProviderHelper.getPublicKeyRingsAsArmoredString(this,
                 new long[] { masterKeyId });
 
-        // close this activity
-        finish();
-
         if (ACTION_SHARE_KEYRING.equals(action)) {
             // let user choose application
             Intent sendIntent = new Intent(Intent.ACTION_SEND);
@@ -71,8 +67,13 @@ public class ShareActivity extends SherlockFragmentActivity {
                     getResources().getText(R.string.shareKeyringWith)));
         } else if (ACTION_SHARE_KEYRING_WITH_QR_CODE.equals(action)) {
             // use barcode scanner integration library
-//            new IntentIntegrator(this).shareText(keyringArmored.get(0));
-//            new IntentIntegratorSupportV4(this).shareText(activity, text);
-        }
+            // TODO: old new IntentIntegrator(this).shareText(keyringArmored.get(0));
+            ShareQrCodeDialogFragment dialog = ShareQrCodeDialogFragment.newInstance(keyringArmored
+                    .get(0));
+            dialog.show(getSupportFragmentManager(), "qrCodeShareDialog");
+        }
+
+        // close this activity
+        // finish();
     }
 }

OpenPGP-Keychain/src/org/sufficientlysecure/keychain/ui/dialog/ShareQrCodeDialogFragment.java

@@ -0,0 +1,171 @@
+/*
+ * Copyright (C) 2012-2013 Dominik Schürmann <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.dialog;
+
+import java.util.ArrayList;
+
+import org.sufficientlysecure.keychain.R;
+import org.sufficientlysecure.keychain.util.QrCodeUtils;
+
+import android.app.Activity;
+import android.app.AlertDialog;
+import android.app.Dialog;
+import android.os.Bundle;
+import android.view.LayoutInflater;
+import android.view.View;
+import android.widget.Button;
+import android.widget.ImageView;
+import android.widget.TextView;
+
+import com.actionbarsherlock.app.SherlockDialogFragment;
+
+public class ShareQrCodeDialogFragment extends SherlockDialogFragment {
+    private static final String ARG_CONTENT = "content";
+
+    private ImageView mImage;
+    private TextView mText;
+
+    private ArrayList<String> mContentList;
+    private int mCounter;
+
+    private static final int QR_CODE_SIZE = 1000;
+
+    /**
+     * Creates new instance of this dialog fragment
+     * 
+     * @param content
+     *            Content to be shared via QR Codes
+     * @return
+     */
+    public static ShareQrCodeDialogFragment newInstance(String content) {
+        ShareQrCodeDialogFragment frag = new ShareQrCodeDialogFragment();
+        Bundle args = new Bundle();
+        args.putString(ARG_CONTENT, content);
+
+        frag.setArguments(args);
+
+        return frag;
+    }
+
+    /**
+     * Creates dialog
+     */
+    @Override
+    public Dialog onCreateDialog(Bundle savedInstanceState) {
+        final Activity activity = getActivity();
+
+        String content = getArguments().getString(ARG_CONTENT);
+        mContentList = splitString(content, 1000);
+
+        AlertDialog.Builder alert = new AlertDialog.Builder(activity);
+
+        alert.setTitle(R.string.menu_shareQrCode);
+
+        LayoutInflater inflater = activity.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);
+
+        // start with first
+        mCounter = 0;
+        mImage.setImageBitmap(QrCodeUtils.getQRCodeBitmap(mContentList.get(mCounter), QR_CODE_SIZE));
+
+        // OnClickListener are set in onResume to prevent automatic dismissing of Dialogs
+        // http://stackoverflow.com/questions/2620444/how-to-prevent-a-dialog-from-closing-when-a-button-is-clicked
+        alert.setPositiveButton(R.string.btn_next, null);
+        alert.setNegativeButton(android.R.string.cancel, null);
+
+        return alert.create();
+    }
+
+    @Override
+    public void onResume() {
+        super.onResume();
+        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--;
+                    updateQrCode();
+                    updateDialog(backButton, nextButton);
+                } else {
+                    dismiss();
+                }
+            }
+        });
+        nextButton.setOnClickListener(new View.OnClickListener() {
+            @Override
+            public void onClick(View v) {
+
+                if (mCounter < mContentList.size() - 1) {
+                    mCounter++;
+                    updateQrCode();
+                    updateDialog(backButton, nextButton);
+                } else {
+                    dismiss();
+                }
+            }
+        });
+    }
+
+    private void updateQrCode() {
+        // Content: <counter>,<size>,<content>
+        mImage.setImageBitmap(QrCodeUtils.getQRCodeBitmap(mCounter + "," + mContentList.size()
+                + "," + mContentList.get(mCounter), 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;
+    }
+}

OpenPGP-Keychain/src/org/sufficientlysecure/keychain/util/QrCodeUtils.java

@@ -45,7 +45,7 @@ public class QrCodeUtils {
     public static Bitmap getQRCodeBitmap(final String input, final int size) {
         try {
             final Hashtable<EncodeHintType, Object> hints = new Hashtable<EncodeHintType, Object>();
-            hints.put(EncodeHintType.ERROR_CORRECTION, ErrorCorrectionLevel.H);
+            hints.put(EncodeHintType.ERROR_CORRECTION, ErrorCorrectionLevel.M);
             final BitMatrix result = QR_CODE_WRITER.encode(input, BarcodeFormat.QR_CODE, size,
                     size, hints);