Java tutorial
/* * Copyright 2012 The Stanford MobiSocial Laboratory * Copyright 2010 ZXing Project * * 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. */ package mobisocial.musubi.social; import java.util.List; import mobisocial.crypto.IBHashedIdentity.Authority; import mobisocial.metrics.MusubiMetrics; import mobisocial.metrics.UsageMetrics; import mobisocial.musubi.App; import mobisocial.musubi.R; import mobisocial.musubi.model.MDevice; import mobisocial.musubi.model.MIdentity; import mobisocial.musubi.model.helpers.IdentitiesManager; import mobisocial.musubi.ui.EmailInviteActivity; import mobisocial.musubi.ui.util.UiUtil; import android.app.Activity; import android.app.AlertDialog; import android.content.Context; import android.content.Intent; import android.graphics.Bitmap; import android.net.Uri; import android.os.Bundle; import android.support.v4.app.DialogFragment; import android.util.Log; import android.view.Display; import android.view.LayoutInflater; import android.view.View; import android.view.View.OnClickListener; import android.view.ViewGroup; import android.view.WindowManager; import android.widget.ImageView; import android.widget.TextView; import android.widget.Toast; import com.google.zxing.WriterException; import com.google.zxing.client.android.Contents; import com.google.zxing.client.android.FinishListener; import com.google.zxing.client.android.Intents; import com.google.zxing.client.android.encode.QRCodeEncoder; import com.google.zxing.integration.android.IntentIntegrator; import com.google.zxing.integration.android.IntentResult; /** * Presents a QR code allowing two devices to perform a key exchange. * * With code from ZXing, {@see EncodeActivity} */ public final class QRInviteDialog extends DialogFragment { private static final String TAG = QRInviteDialog.class.getSimpleName(); private QRCodeEncoder qrCodeEncoder; /** * Create a new instance of MyDialogFragment, providing "num" * as an argument. */ public static QRInviteDialog newInstance() { QRInviteDialog f = new QRInviteDialog(); Bundle args = new Bundle(); f.setArguments(args); return f; } @Override public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) { return inflater.inflate(R.layout.qr_invite, container, false); } @Override public void onViewCreated(View view, Bundle savedInstanceState) { super.onViewCreated(view, savedInstanceState); Activity context = getActivity(); getDialog().setTitle("Exchange Info"); // This assumes the view is full screen, which is a bad assumption WindowManager manager = (WindowManager) context.getSystemService(Context.WINDOW_SERVICE); Display display = manager.getDefaultDisplay(); int width = display.getWidth(); int height = display.getHeight(); int smallerDimension = width < height ? width : height; Uri uri = EmailInviteActivity.getInvitationUrl(context); if (uri.getQueryParameter("n") == null) { Toast.makeText(getActivity(), "You must set up an account and a enter a name to connect with friends.", Toast.LENGTH_LONG).show(); dismiss(); return; } if (uri.getQueryParameter("t") == null) { dismiss(); Toast.makeText(getActivity(), "No identities to share", Toast.LENGTH_SHORT).show(); return; } Intent intent = new Intent(Intents.Encode.ACTION); intent.setClass(getActivity(), QRInviteDialog.class); intent.putExtra(Intents.Encode.TYPE, Contents.Type.TEXT); intent.putExtra(Intents.Encode.DATA, uri.toString()); try { qrCodeEncoder = new QRCodeEncoder(context, intent, smallerDimension); //setTitle(getString(R.string.app_name) + " - " + qrCodeEncoder.getTitle()); Bitmap bitmap = qrCodeEncoder.encodeAsBitmap(); ImageView image = (ImageView) view.findViewById(R.id.image_view); image.setImageBitmap(bitmap); TextView contents = (TextView) view.findViewById(R.id.contents_text_view); contents.setText(qrCodeEncoder.getDisplayContents()); view.findViewById(R.id.ok_button).setOnClickListener(mCameraListener); } catch (WriterException e) { Log.e(TAG, "Could not encode barcode", e); showErrorMessage(R.string.msg_encode_contents_failed); qrCodeEncoder = null; } catch (IllegalArgumentException e) { Log.e(TAG, "Could not encode barcode", e); showErrorMessage(R.string.msg_encode_contents_failed); qrCodeEncoder = null; } } private void showErrorMessage(int message) { AlertDialog.Builder builder = new AlertDialog.Builder(getActivity()); builder.setMessage(message); builder.setPositiveButton(R.string.button_ok, new FinishListener(getActivity())); builder.setOnCancelListener(new FinishListener(getActivity())); builder.show(); } private OnClickListener mCameraListener = new OnClickListener() { @Override public void onClick(android.view.View v) { new UsageMetrics(getActivity()).report(MusubiMetrics.CLICKED_QR_SCAN); IntentIntegrator.initiateScan(getActivity()); } }; public void onActivityResult(int requestCode, int resultCode, Intent data) { if (requestCode == IntentIntegrator.REQUEST_CODE) { if (resultCode == Activity.RESULT_OK) { IntentResult result = IntentIntegrator.parseActivityResult(requestCode, resultCode, data); try { Uri uri = Uri.parse(result.getContents()); Intent i = new Intent(Intent.ACTION_VIEW, uri); i.setPackage(getActivity().getPackageName()); startActivity(i); } catch (IllegalArgumentException e) { } } } }; }