Java tutorial
/* * Copyright (C) 2014 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.app.Activity; import android.content.Context; import android.os.Bundle; import android.os.Handler; import android.os.Message; import android.os.Messenger; import android.support.v4.app.Fragment; import android.support.v7.widget.DefaultItemAnimator; import android.support.v7.widget.LinearLayoutManager; import android.support.v7.widget.RecyclerView; import android.view.LayoutInflater; import android.view.View; import android.view.ViewGroup; import android.view.inputmethod.InputMethodManager; import android.widget.Button; import android.widget.EditText; import android.widget.ImageButton; import android.widget.TextView; import org.sufficientlysecure.keychain.R; import org.sufficientlysecure.keychain.ui.CreateKeyActivity.FragAction; import org.sufficientlysecure.keychain.ui.dialog.AddEmailDialogFragment; import org.sufficientlysecure.keychain.ui.util.Notify; import org.sufficientlysecure.keychain.ui.widget.EmailEditText; import java.util.ArrayList; import java.util.List; public class CreateKeyEmailFragment extends Fragment { private CreateKeyActivity mCreateKeyActivity; private EmailEditText mEmailEdit; private ArrayList<EmailAdapter.ViewModel> mAdditionalEmailModels = new ArrayList<>(); private EmailAdapter mEmailAdapter; /** * Creates new instance of this fragment */ public static CreateKeyEmailFragment newInstance() { CreateKeyEmailFragment frag = new CreateKeyEmailFragment(); Bundle args = new Bundle(); frag.setArguments(args); return frag; } /** * Checks if text of given EditText is not empty. If it is empty an error is * set and the EditText gets the focus. * * @param editText * @return true if EditText is not empty */ private boolean isMainEmailValid(EditText editText) { if (editText.getText().length() == 0) { editText.setError(getString(R.string.create_key_empty)); editText.requestFocus(); return false; } else if (!checkEmail(editText.getText().toString(), false)) { return false; } editText.setError(null); return true; } @Override public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) { View view = inflater.inflate(R.layout.create_key_email_fragment, container, false); mEmailEdit = (EmailEditText) view.findViewById(R.id.create_key_email); View backButton = view.findViewById(R.id.create_key_back_button); View nextButton = view.findViewById(R.id.create_key_next_button); RecyclerView emailsRecyclerView = (RecyclerView) view.findViewById(R.id.create_key_emails); // initial values mEmailEdit.setText(mCreateKeyActivity.mEmail); // focus empty edit fields if (mCreateKeyActivity.mEmail == null) { mEmailEdit.requestFocus(); } backButton.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { mCreateKeyActivity.loadFragment(null, FragAction.TO_LEFT); } }); nextButton.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { nextClicked(); } }); emailsRecyclerView.setHasFixedSize(true); emailsRecyclerView.setLayoutManager(new LinearLayoutManager(getActivity())); emailsRecyclerView.setItemAnimator(new DefaultItemAnimator()); if (mEmailAdapter == null) { mEmailAdapter = new EmailAdapter(mAdditionalEmailModels, new View.OnClickListener() { @Override public void onClick(View v) { addEmail(); } }); if (mCreateKeyActivity.mAdditionalEmails != null) { mEmailAdapter.addAll(mCreateKeyActivity.mAdditionalEmails); } } emailsRecyclerView.setAdapter(mEmailAdapter); return view; } /** * Checks if a given email is valid * * @param email * @param additionalEmail * @return */ private boolean checkEmail(String email, boolean additionalEmail) { if (email.isEmpty()) { Notify.create(getActivity(), getString(R.string.create_key_email_empty_email), Notify.LENGTH_LONG, Notify.Style.ERROR).show(CreateKeyEmailFragment.this); return false; } // check for duplicated emails if (!additionalEmail && isEmailDuplicatedInsideAdapter(email) || additionalEmail && mEmailEdit.getText().length() > 0 && email.equals(mEmailEdit.getText().toString())) { Notify.create(getActivity(), getString(R.string.create_key_email_already_exists_text), Notify.LENGTH_LONG, Notify.Style.ERROR).show(CreateKeyEmailFragment.this); return false; } return true; } /** * Checks for duplicated emails inside the additional email adapter. * * @param email * @return */ private boolean isEmailDuplicatedInsideAdapter(String email) { //check for duplicated emails inside the adapter for (EmailAdapter.ViewModel model : mAdditionalEmailModels) { if (email.equals(model.email)) { return true; } } return false; } /** * Displays a dialog fragment for the user to input a valid email. */ private void addEmail() { Handler returnHandler = new Handler() { @Override public void handleMessage(Message message) { if (message.what == AddEmailDialogFragment.MESSAGE_OKAY) { Bundle data = message.getData(); String email = data.getString(AddEmailDialogFragment.MESSAGE_DATA_EMAIL); if (checkEmail(email, true)) { // add new user id mEmailAdapter.add(email); } } } }; // Create a new Messenger for the communication back Messenger messenger = new Messenger(returnHandler); AddEmailDialogFragment addEmailDialog = AddEmailDialogFragment.newInstance(messenger); addEmailDialog.show(getActivity().getSupportFragmentManager(), "addEmailDialog"); } @Override public void onAttach(Activity activity) { super.onAttach(activity); mCreateKeyActivity = (CreateKeyActivity) getActivity(); } private void nextClicked() { if (isMainEmailValid(mEmailEdit)) { // save state mCreateKeyActivity.mEmail = mEmailEdit.getText().toString(); mCreateKeyActivity.mAdditionalEmails = getAdditionalEmails(); CreateKeyActivity createKeyActivity = ((CreateKeyActivity) getActivity()); if (createKeyActivity.mCreateSecurityToken) { hideKeyboard(); CreateSecurityTokenPinFragment frag = CreateSecurityTokenPinFragment.newInstance(); mCreateKeyActivity.loadFragment(frag, FragAction.TO_RIGHT); } else { CreateKeyPassphraseFragment frag = CreateKeyPassphraseFragment.newInstance(); mCreateKeyActivity.loadFragment(frag, FragAction.TO_RIGHT); } } } private void hideKeyboard() { if (getActivity() == null) { return; } InputMethodManager inputManager = (InputMethodManager) getActivity() .getSystemService(Context.INPUT_METHOD_SERVICE); // check if no view has focus View v = getActivity().getCurrentFocus(); if (v == null) return; inputManager.hideSoftInputFromWindow(v.getWindowToken(), 0); } private ArrayList<String> getAdditionalEmails() { ArrayList<String> emails = new ArrayList<>(); for (EmailAdapter.ViewModel holder : mAdditionalEmailModels) { emails.add(holder.toString()); } return emails; } @Override public void onSaveInstanceState(Bundle outState) { super.onSaveInstanceState(outState); // save state in activity mCreateKeyActivity.mAdditionalEmails = getAdditionalEmails(); } public static class EmailAdapter extends RecyclerView.Adapter<RecyclerView.ViewHolder> { private List<ViewModel> mDataset; private View.OnClickListener mFooterOnClickListener; private static final int TYPE_FOOTER = 0; private static final int TYPE_ITEM = 1; public static class ViewModel { String email; ViewModel(String email) { this.email = email; } @Override public String toString() { return email; } } // Provide a reference to the views for each data item // Complex data items may need more than one view per item, and // you provide access to all the views for a data item in a view holder class ViewHolder extends RecyclerView.ViewHolder { public TextView mTextView; public ImageButton mDeleteButton; public ViewHolder(View itemView) { super(itemView); mTextView = (TextView) itemView.findViewById(R.id.create_key_email_item_email); mDeleteButton = (ImageButton) itemView.findViewById(R.id.create_key_email_item_delete_button); } } class FooterHolder extends RecyclerView.ViewHolder { public Button mAddButton; public FooterHolder(View itemView) { super(itemView); mAddButton = (Button) itemView.findViewById(R.id.create_key_add_email); } } // Provide a suitable constructor (depends on the kind of dataset) public EmailAdapter(List<ViewModel> myDataset, View.OnClickListener onFooterClickListener) { mDataset = myDataset; mFooterOnClickListener = onFooterClickListener; } // Create new views (invoked by the layout manager) @Override public RecyclerView.ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) { if (viewType == TYPE_FOOTER) { View v = LayoutInflater.from(parent.getContext()).inflate(R.layout.create_key_email_list_footer, parent, false); return new FooterHolder(v); } else { //inflate your layout and pass it to view holder View v = LayoutInflater.from(parent.getContext()).inflate(R.layout.create_key_email_list_item, parent, false); return new ViewHolder(v); } } // Replace the contents of a view (invoked by the layout manager) @Override public void onBindViewHolder(RecyclerView.ViewHolder holder, final int position) { if (holder instanceof FooterHolder) { FooterHolder thisHolder = (FooterHolder) holder; thisHolder.mAddButton.setOnClickListener(mFooterOnClickListener); } else if (holder instanceof ViewHolder) { ViewHolder thisHolder = (ViewHolder) holder; // - get element from your dataset at this position // - replace the contents of the view with that element final ViewModel model = mDataset.get(position); thisHolder.mTextView.setText(model.email); thisHolder.mDeleteButton.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { remove(model); } }); } } // Return the size of your dataset (invoked by the layout manager) @Override public int getItemCount() { return mDataset.size() + 1; } @Override public int getItemViewType(int position) { if (isPositionFooter(position)) { return TYPE_FOOTER; } else { return TYPE_ITEM; } } private boolean isPositionFooter(int position) { return position == mDataset.size(); } public void add(String email) { mDataset.add(new ViewModel(email)); notifyItemInserted(mDataset.size() - 1); } private void addAll(ArrayList<String> emails) { for (String email : emails) { mDataset.add(new EmailAdapter.ViewModel(email)); } } public void remove(ViewModel model) { int position = mDataset.indexOf(model); mDataset.remove(position); notifyItemRemoved(position); } } }