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.adapter; import android.content.Context; import android.database.Cursor; import android.support.v4.widget.CursorAdapter; import android.view.LayoutInflater; import android.view.View; import android.view.ViewGroup; import android.widget.AdapterView; import android.widget.CheckBox; import android.widget.CompoundButton; import android.widget.ImageView; import android.widget.LinearLayout; import android.widget.TextView; import org.sufficientlysecure.keychain.R; import org.sufficientlysecure.keychain.helper.OtherHelper; import org.sufficientlysecure.keychain.pgp.PgpKeyHelper; import org.sufficientlysecure.keychain.provider.KeychainContract.Certs; import org.sufficientlysecure.keychain.provider.KeychainContract.UserIds; import java.util.ArrayList; public class ViewKeyUserIdsAdapter extends CursorAdapter implements AdapterView.OnItemClickListener { private LayoutInflater mInflater; private int mIndexUserId, mIndexRank; private int mVerifiedId, mIsRevoked, mIsPrimary; private final ArrayList<Boolean> mCheckStates; public static final String[] USER_IDS_PROJECTION = new String[] { UserIds._ID, UserIds.USER_ID, UserIds.RANK, UserIds.VERIFIED, UserIds.IS_PRIMARY, UserIds.IS_REVOKED }; public ViewKeyUserIdsAdapter(Context context, Cursor c, int flags, boolean showCheckBoxes) { super(context, c, flags); mInflater = LayoutInflater.from(context); mCheckStates = showCheckBoxes ? new ArrayList<Boolean>() : null; initIndex(c); } public ViewKeyUserIdsAdapter(Context context, Cursor c, int flags) { this(context, c, flags, false); } @Override public Cursor swapCursor(Cursor newCursor) { initIndex(newCursor); if (mCheckStates != null) { mCheckStates.clear(); if (newCursor != null) { int count = newCursor.getCount(); mCheckStates.ensureCapacity(count); // initialize to true (use case knowledge: we usually want to sign all uids) for (int i = 0; i < count; i++) { newCursor.moveToPosition(i); int verified = newCursor.getInt(mVerifiedId); mCheckStates.add(verified != Certs.VERIFIED_SECRET); } } } return super.swapCursor(newCursor); } /** * Get column indexes for performance reasons just once in constructor and swapCursor. For a * performance comparison see http://stackoverflow.com/a/17999582 * * @param cursor */ private void initIndex(Cursor cursor) { if (cursor != null) { mIndexUserId = cursor.getColumnIndexOrThrow(UserIds.USER_ID); mIndexRank = cursor.getColumnIndexOrThrow(UserIds.RANK); mVerifiedId = cursor.getColumnIndexOrThrow(UserIds.VERIFIED); mIsRevoked = cursor.getColumnIndexOrThrow(UserIds.IS_REVOKED); mIsPrimary = cursor.getColumnIndexOrThrow(UserIds.IS_PRIMARY); } } @Override public void bindView(View view, Context context, Cursor cursor) { TextView vName = (TextView) view.findViewById(R.id.userId); TextView vAddress = (TextView) view.findViewById(R.id.address); TextView vComment = (TextView) view.findViewById(R.id.comment); ImageView vVerified = (ImageView) view.findViewById(R.id.certified); String[] userId = PgpKeyHelper.splitUserId(cursor.getString(mIndexUserId)); if (userId[0] != null) { vName.setText(userId[0]); } else { vName.setText(R.string.user_id_no_name); } if (userId[1] != null) { vAddress.setText(userId[1]); vAddress.setVisibility(View.VISIBLE); } else { vAddress.setVisibility(View.GONE); } if (userId[2] != null) { vComment.setText(userId[2]); vComment.setVisibility(View.VISIBLE); } else { vComment.setVisibility(View.GONE); } // show small star icon for primary user ids boolean isPrimary = cursor.getInt(mIsPrimary) != 0; if (cursor.getInt(mIsRevoked) > 0) { // set revocation icon (can this even be primary?) vVerified.setImageResource(R.drawable.key_certify_revoke); // disable and strike through text for revoked user ids vName.setEnabled(false); vAddress.setEnabled(false); vName.setText(OtherHelper.strikeOutText(vName.getText())); vAddress.setText(OtherHelper.strikeOutText(vAddress.getText())); } else { vName.setEnabled(true); vAddress.setEnabled(true); int verified = cursor.getInt(mVerifiedId); switch (verified) { case Certs.VERIFIED_SECRET: vVerified.setImageResource( isPrimary ? R.drawable.key_certify_primary_ok_depth0 : R.drawable.key_certify_ok_depth0); break; case Certs.VERIFIED_SELF: vVerified.setImageResource( isPrimary ? R.drawable.key_certify_primary_ok_self : R.drawable.key_certify_ok_self); break; default: vVerified.setImageResource(R.drawable.key_certify_error); break; } } // don't care further if checkboxes aren't shown if (mCheckStates == null) { return; } final CheckBox vCheckBox = (CheckBox) view.findViewById(R.id.checkBox); final int position = cursor.getPosition(); vCheckBox.setOnCheckedChangeListener(null); vCheckBox.setChecked(mCheckStates.get(position)); vCheckBox.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() { @Override public void onCheckedChanged(CompoundButton compoundButton, boolean b) { mCheckStates.set(position, b); } }); vCheckBox.setClickable(false); } public void onItemClick(AdapterView<?> adapter, View view, int position, long id) { CheckBox box = ((CheckBox) view.findViewById(R.id.checkBox)); if (box != null) { box.toggle(); } } public ArrayList<String> getSelectedUserIds() { ArrayList<String> result = new ArrayList<String>(); for (int i = 0; i < mCheckStates.size(); i++) { if (mCheckStates.get(i)) { mCursor.moveToPosition(i); result.add(mCursor.getString(mIndexUserId)); } } return result; } @Override public View newView(Context context, Cursor cursor, ViewGroup parent) { View view = mInflater.inflate(R.layout.view_key_userids_item, null); // only need to do this once ever, since mShowCheckBoxes is final view.findViewById(R.id.checkBox).setVisibility(mCheckStates != null ? View.VISIBLE : View.GONE); return view; } // Disable selection of items for lists without checkboxes, http://stackoverflow.com/a/4075045 @Override public boolean areAllItemsEnabled() { if (mCheckStates == null) { return false; } else { return super.areAllItemsEnabled(); } } // Disable selection of items for lists without checkboxes, http://stackoverflow.com/a/4075045 @Override public boolean isEnabled(int position) { if (mCheckStates == null) { return false; } else { return super.isEnabled(position); } } }