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.remote.ui; import android.content.Context; import android.content.Intent; import android.database.Cursor; import android.net.Uri; import android.os.Bundle; import android.support.v4.app.ListFragment; import android.support.v4.app.LoaderManager; import android.support.v4.content.CursorLoader; import android.support.v4.content.Loader; 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.AdapterView.OnItemClickListener; import android.widget.ListView; import android.widget.TextView; import org.sufficientlysecure.keychain.Constants; import org.sufficientlysecure.keychain.R; import org.sufficientlysecure.keychain.provider.KeychainContract; import org.sufficientlysecure.keychain.ui.widget.FixedListView; import org.sufficientlysecure.keychain.util.Log; public class AccountsListFragment extends ListFragment implements LoaderManager.LoaderCallbacks<Cursor> { private static final String ARG_DATA_URI = "uri"; // This is the Adapter being used to display the list's data. AccountsAdapter mAdapter; private Uri mDataUri; /** * Creates new instance of this fragment */ public static AccountsListFragment newInstance(Uri dataUri) { AccountsListFragment frag = new AccountsListFragment(); Bundle args = new Bundle(); args.putParcelable(ARG_DATA_URI, dataUri); frag.setArguments(args); return frag; } @Override public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) { View layout = super.onCreateView(inflater, container, savedInstanceState); ListView lv = (ListView) layout.findViewById(android.R.id.list); ViewGroup parent = (ViewGroup) lv.getParent(); /* * http://stackoverflow.com/a/15880684 * Remove ListView and add FixedListView in its place. * This is done here programatically to be still able to use the progressBar of ListFragment. * * We want FixedListView to be able to put this ListFragment inside a ScrollView */ int lvIndex = parent.indexOfChild(lv); parent.removeViewAt(lvIndex); FixedListView newLv = new FixedListView(getActivity()); newLv.setId(android.R.id.list); parent.addView(newLv, lvIndex, lv.getLayoutParams()); return layout; } @Override public void onActivityCreated(Bundle savedInstanceState) { super.onActivityCreated(savedInstanceState); mDataUri = getArguments().getParcelable(ARG_DATA_URI); getListView().setOnItemClickListener(new OnItemClickListener() { @Override public void onItemClick(AdapterView<?> adapterView, View view, int position, long id) { String selectedAccountName = mAdapter.getItemAccountName(position); Uri accountUri = mDataUri.buildUpon().appendEncodedPath(selectedAccountName).build(); Log.d(Constants.TAG, "accountUri: " + accountUri); // edit account settings Intent intent = new Intent(getActivity(), AccountSettingsActivity.class); intent.setData(accountUri); startActivity(intent); } }); // Give some text to display if there is no data. In a real // application this would come from a resource. setEmptyText(getString(R.string.api_settings_accounts_empty)); // We have a menu item to show in action bar. setHasOptionsMenu(true); // Create an empty adapter we will use to display the loaded data. mAdapter = new AccountsAdapter(getActivity(), null, 0); setListAdapter(mAdapter); // Prepare the loader. Either re-connect with an existing one, // or start a new one. getLoaderManager().initLoader(0, null, this); } // These are the Contacts rows that we will retrieve. static final String[] PROJECTION = new String[] { KeychainContract.ApiAccounts._ID, // 0 KeychainContract.ApiAccounts.ACCOUNT_NAME // 1 }; public Loader<Cursor> onCreateLoader(int id, Bundle args) { // This is called when a new Loader needs to be created. This // sample only has one Loader, so we don't care about the ID. // Now create and return a CursorLoader that will take care of // creating a Cursor for the data being displayed. return new CursorLoader(getActivity(), mDataUri, PROJECTION, null, null, KeychainContract.ApiAccounts.ACCOUNT_NAME + " COLLATE LOCALIZED ASC"); } public void onLoadFinished(Loader<Cursor> loader, Cursor data) { // Swap the new cursor in. (The framework will take care of closing the // old cursor once we return.) mAdapter.swapCursor(data); } public void onLoaderReset(Loader<Cursor> loader) { // This is called when the last Cursor provided to onLoadFinished() // above is about to be closed. We need to make sure we are no // longer using it. mAdapter.swapCursor(null); } private class AccountsAdapter extends CursorAdapter { private LayoutInflater mInflater; public AccountsAdapter(Context context, Cursor c, int flags) { super(context, c, flags); mInflater = LayoutInflater.from(context); } /** * Similar to CursorAdapter.getItemId(). * Required to build Uris for api accounts, which are not based on row ids * * @param position * @return */ public String getItemAccountName(int position) { if (mDataValid && mCursor != null) { if (mCursor.moveToPosition(position)) { return mCursor.getString(1); } else { return null; } } else { return null; } } @Override public void bindView(View view, Context context, Cursor cursor) { TextView text = (TextView) view.findViewById(R.id.api_accounts_adapter_item_name); String accountName = cursor.getString(1); text.setText(accountName); } @Override public View newView(Context context, Cursor cursor, ViewGroup parent) { return mInflater.inflate(R.layout.api_accounts_adapter_list_item, null); } } }