Java tutorial
/* -*- Mode: Java; c-basic-offset: 4; tab-width: 20; indent-tabs-mode: nil; -*- * This Source Code Form is subject to the terms of the Mozilla Public * License, v. 2.0. If a copy of the MPL was not distributed with this * file, You can obtain one at http://mozilla.org/MPL/2.0/. */ package org.mozilla.gecko.home; import java.util.EnumSet; import org.mozilla.gecko.R; import org.mozilla.gecko.db.BrowserContract.URLColumns; import org.mozilla.gecko.db.BrowserDB.FilterFlags; import org.mozilla.gecko.util.StringUtils; import android.content.Context; import android.database.Cursor; import android.os.Bundle; import android.support.v4.app.DialogFragment; import android.support.v4.app.LoaderManager; import android.support.v4.app.LoaderManager.LoaderCallbacks; import android.support.v4.content.Loader; import android.support.v4.widget.CursorAdapter; import android.text.Editable; import android.text.TextUtils; import android.text.TextWatcher; import android.view.KeyEvent; import android.view.LayoutInflater; import android.view.View; import android.view.ViewGroup; import android.view.WindowManager; import android.widget.AdapterView; import android.widget.EditText; import android.widget.ListView; /** * Dialog fragment that displays frecency search results, for pinning a site, in a GridView. */ class PinSiteDialog extends DialogFragment { // Listener for url selection public static interface OnSiteSelectedListener { public void onSiteSelected(String url, String title); } // Cursor loader ID for search query private static final int LOADER_ID_SEARCH = 0; // Holds the current search term to use in the query private String mSearchTerm; // Adapter for the list of search results private SearchAdapter mAdapter; // Search entry private EditText mSearch; // Search results private ListView mList; // Callbacks used for the search loader private CursorLoaderCallbacks mLoaderCallbacks; // Bookmark selected listener private OnSiteSelectedListener mOnSiteSelectedListener; public static PinSiteDialog newInstance() { return new PinSiteDialog(); } private PinSiteDialog() { } @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setStyle(DialogFragment.STYLE_NO_TITLE, android.R.style.Theme_Holo_Light_Dialog); } @Override public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) { // All list views are styled to look the same with a global activity theme. // If the style of the list changes, inflate it from an XML. return inflater.inflate(R.layout.pin_site_dialog, container, false); } @Override public void onViewCreated(View view, Bundle savedInstanceState) { super.onViewCreated(view, savedInstanceState); mSearch = (EditText) view.findViewById(R.id.search); mSearch.addTextChangedListener(new TextWatcher() { @Override public void afterTextChanged(Editable s) { } @Override public void beforeTextChanged(CharSequence s, int start, int count, int after) { } @Override public void onTextChanged(CharSequence s, int start, int before, int count) { setSearchTerm(mSearch.getText().toString()); filter(mSearchTerm); } }); mSearch.setOnKeyListener(new View.OnKeyListener() { @Override public boolean onKey(View v, int keyCode, KeyEvent event) { if (keyCode != KeyEvent.KEYCODE_ENTER || mOnSiteSelectedListener == null) { return false; } // If the user manually entered a search term or URL, wrap the value in // a special URI until we can get a valid URL for this bookmark. final String text = mSearch.getText().toString().trim(); if (!TextUtils.isEmpty(text)) { final String url = StringUtils.encodeUserEnteredUrl(text); mOnSiteSelectedListener.onSiteSelected(url, text); dismiss(); } return true; } }); mSearch.setOnFocusChangeListener(new View.OnFocusChangeListener() { @Override public void onFocusChange(View v, boolean hasFocus) { if (hasFocus) { getDialog().getWindow() .setSoftInputMode(WindowManager.LayoutParams.SOFT_INPUT_STATE_ALWAYS_VISIBLE); } } }); mList = (HomeListView) view.findViewById(R.id.list); mList.setOnItemClickListener(new AdapterView.OnItemClickListener() { @Override public void onItemClick(AdapterView<?> parent, View view, int position, long id) { if (mOnSiteSelectedListener != null) { final Cursor c = mAdapter.getCursor(); if (c == null || !c.moveToPosition(position)) { return; } final String url = c.getString(c.getColumnIndexOrThrow(URLColumns.URL)); final String title = c.getString(c.getColumnIndexOrThrow(URLColumns.TITLE)); mOnSiteSelectedListener.onSiteSelected(url, title); } // Dismiss the fragment and the dialog. dismiss(); } }); } @Override public void onActivityCreated(Bundle savedInstanceState) { super.onActivityCreated(savedInstanceState); final LoaderManager manager = getLoaderManager(); // Initialize the search adapter mAdapter = new SearchAdapter(getActivity()); mList.setAdapter(mAdapter); // Create callbacks before the initial loader is started mLoaderCallbacks = new CursorLoaderCallbacks(); // Reconnect to the loader only if present manager.initLoader(LOADER_ID_SEARCH, null, mLoaderCallbacks); // If there is a search term, put it in the text field if (!TextUtils.isEmpty(mSearchTerm)) { mSearch.setText(mSearchTerm); mSearch.selectAll(); } // Always start with an empty filter filter(""); } @Override public void onDestroyView() { super.onDestroyView(); // Discard any additional site selection as the dialog // is getting destroyed (see bug 935542). setOnSiteSelectedListener(null); } public void setSearchTerm(String searchTerm) { mSearchTerm = searchTerm; } private void filter(String searchTerm) { // Restart loaders with the new search term SearchLoader.restart(getLoaderManager(), LOADER_ID_SEARCH, mLoaderCallbacks, searchTerm, EnumSet.of(FilterFlags.EXCLUDE_PINNED_SITES)); } public void setOnSiteSelectedListener(OnSiteSelectedListener listener) { mOnSiteSelectedListener = listener; } private static class SearchAdapter extends CursorAdapter { private final LayoutInflater mInflater; public SearchAdapter(Context context) { super(context, null, 0); mInflater = LayoutInflater.from(context); } @Override public void bindView(View view, Context context, Cursor cursor) { TwoLinePageRow row = (TwoLinePageRow) view; row.setShowIcons(false); row.updateFromCursor(cursor); } @Override public View newView(Context context, Cursor cursor, ViewGroup parent) { return (TwoLinePageRow) mInflater.inflate(R.layout.home_item_row, parent, false); } } private class CursorLoaderCallbacks implements LoaderCallbacks<Cursor> { @Override public Loader<Cursor> onCreateLoader(int id, Bundle args) { return SearchLoader.createInstance(getActivity(), args); } @Override public void onLoadFinished(Loader<Cursor> loader, Cursor c) { mAdapter.swapCursor(c); } @Override public void onLoaderReset(Loader<Cursor> loader) { mAdapter.swapCursor(null); } } }