Java tutorial
/* -*- Mode: Java; c-basic-offset: 4; tab-width: 20; indent-tabs-mode: nil; -*- * ***** BEGIN LICENSE BLOCK ***** * Version: MPL 1.1/GPL 2.0/LGPL 2.1 * * The contents of this file are subject to the Mozilla Public License Version * 1.1 (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.mozilla.org/MPL/ * * Software distributed under the License is distributed on an "AS IS" basis, * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License * for the specific language governing rights and limitations under the * License. * * The Original Code is Mozilla Android code. * * The Initial Developer of the Original Code is Mozilla Foundation. * Portions created by the Initial Developer are Copyright (C) 2011 * the Initial Developer. All Rights Reserved. * * Contributor(s): * Brad Lassey <blassey@mozilla.com> * Lucas Rocha <lucasr@mozilla.com> * * Alternatively, the contents of this file may be used under the terms of * either the GNU General Public License Version 2 or later (the "GPL"), or * the GNU Lesser General Public License Version 2.1 or later (the "LGPL"), * in which case the provisions of the GPL or the LGPL are applicable instead * of those above. If you wish to allow use of your version of this file only * under the terms of either the GPL or the LGPL, and not to allow others to * use your version of this file under the terms of the MPL, indicate your * decision by deleting the provisions above and replace them with the notice * and other provisions required by the GPL or the LGPL. If you do not delete * the provisions above, a recipient may use your version of this file under * the terms of any one of the MPL, the GPL or the LGPL. * * ***** END LICENSE BLOCK ***** */ package org.mozilla.gecko; import java.io.File; import java.io.FileInputStream; import java.io.FileNotFoundException; import java.io.InputStream; import java.io.IOException; import java.net.URL; import java.net.MalformedURLException; import java.util.ArrayList; import java.util.EnumSet; import java.util.zip.ZipEntry; import java.util.zip.ZipFile; import org.json.JSONArray; import org.json.JSONException; import org.json.JSONObject; import org.mozilla.fennec_satyanarayan.R; import org.mozilla.gecko.db.BrowserDB; import org.mozilla.gecko.db.BrowserDB.URLColumns; import org.mozilla.gecko.sync.setup.activities.SetupSyncActivity; import android.accounts.Account; import android.accounts.AccountManager; import android.accounts.OnAccountsUpdateListener; import android.app.Activity; import android.content.ContentResolver; import android.content.Context; import android.content.Intent; import android.content.res.Configuration; import android.database.Cursor; import android.graphics.Bitmap; import android.graphics.BitmapFactory; import android.graphics.drawable.BitmapDrawable; import android.graphics.drawable.Drawable; import android.text.SpannableString; import android.text.style.StyleSpan; import android.text.style.UnderlineSpan; import android.util.AttributeSet; import android.util.Log; import android.util.DisplayMetrics; import android.view.LayoutInflater; import android.view.View; import android.widget.AdapterView; import android.widget.ArrayAdapter; import android.widget.FrameLayout; import android.widget.GridView; import android.widget.ImageView; import android.widget.LinearLayout; import android.widget.ListView; import android.widget.RelativeLayout; import android.widget.ScrollView; import android.widget.SimpleCursorAdapter; import android.widget.TextView; public class AboutHomeContent extends ScrollView { private static final String LOGTAG = "GeckoAboutHome"; private static final int NUMBER_OF_TOP_SITES_PORTRAIT = 4; private static final int NUMBER_OF_TOP_SITES_LANDSCAPE = 3; private static final int NUMBER_OF_COLS_PORTRAIT = 2; private static final int NUMBER_OF_COLS_LANDSCAPE = 3; static enum UpdateFlags { TOP_SITES, PREVIOUS_TABS, RECOMMENDED_ADDONS; public static final EnumSet<UpdateFlags> ALL = EnumSet.allOf(UpdateFlags.class); } private Cursor mCursor; UriLoadCallback mUriLoadCallback = null; private LayoutInflater mInflater; private AccountManager mAccountManager; protected SimpleCursorAdapter mTopSitesAdapter; protected GridView mTopSitesGrid; protected LinearLayout mAddonsLayout; protected LinearLayout mLastTabsLayout; public interface UriLoadCallback { public void callback(String uriSpec); } public AboutHomeContent(Context context) { super(context); } public AboutHomeContent(Context context, AttributeSet attrs) { super(context, attrs); } public void init() { Context context = getContext(); mInflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE); mInflater.inflate(R.layout.abouthome_content, this); mAccountManager = AccountManager.get(context); // The listener will run on the background thread (see 2nd argument) mAccountManager.addOnAccountsUpdatedListener(new OnAccountsUpdateListener() { public void onAccountsUpdated(Account[] accounts) { final GeckoApp.StartupMode startupMode = GeckoApp.mAppContext.getStartupMode(); final boolean syncIsSetup = isSyncSetup(); GeckoApp.mAppContext.mMainHandler.post(new Runnable() { public void run() { // The listener might run before the UI is initially updated. // In this case, we should simply wait for the initial setup // to happen. if (mTopSitesAdapter != null) updateLayout(startupMode, syncIsSetup); } }); } }, GeckoAppShell.getHandler(), false); mTopSitesGrid = (GridView) findViewById(R.id.top_sites_grid); mTopSitesGrid.setOnItemClickListener(new AdapterView.OnItemClickListener() { public void onItemClick(AdapterView<?> parent, View v, int position, long id) { Cursor c = (Cursor) parent.getItemAtPosition(position); String spec = c.getString(c.getColumnIndex(URLColumns.URL)); Log.i(LOGTAG, "clicked: " + spec); if (mUriLoadCallback != null) mUriLoadCallback.callback(spec); } }); mAddonsLayout = (LinearLayout) findViewById(R.id.recommended_addons); mLastTabsLayout = (LinearLayout) findViewById(R.id.last_tabs); TextView allTopSitesText = (TextView) findViewById(R.id.all_top_sites_text); allTopSitesText.setOnClickListener(new OnClickListener() { public void onClick(View v) { GeckoApp.mAppContext.showAwesomebar(AwesomeBar.Type.EDIT); } }); TextView allAddonsText = (TextView) findViewById(R.id.all_addons_text); allAddonsText.setOnClickListener(new OnClickListener() { public void onClick(View v) { if (mUriLoadCallback != null) mUriLoadCallback.callback("https://addons.mozilla.org/android"); } }); TextView syncTextView = (TextView) findViewById(R.id.sync_text); String syncText = syncTextView.getText().toString() + " \u00BB"; String boldName = getContext().getResources().getString(R.string.abouthome_sync_bold_name); int styleIndex = syncText.indexOf(boldName); // Highlight any occurrence of "Firefox Sync" in the string // with a bold style. if (styleIndex >= 0) { SpannableString spannableText = new SpannableString(syncText); spannableText.setSpan(new StyleSpan(android.graphics.Typeface.BOLD), styleIndex, styleIndex + 12, 0); syncTextView.setText(spannableText, TextView.BufferType.SPANNABLE); } RelativeLayout syncBox = (RelativeLayout) findViewById(R.id.sync_box); syncBox.setOnClickListener(new OnClickListener() { public void onClick(View v) { Context context = v.getContext(); Intent intent = new Intent(context, SetupSyncActivity.class); context.startActivity(intent); } }); } void setLastTabsVisibility(boolean visible) { int visibility = visible ? View.VISIBLE : View.GONE; findViewById(R.id.last_tabs_title).setVisibility(visibility); findViewById(R.id.last_tabs).setVisibility(visibility); findViewById(R.id.last_tabs_open_all).setVisibility(visibility); } private void setAddonsVisibility(boolean visible) { int visibility = visible ? View.VISIBLE : View.GONE; findViewById(R.id.recommended_addons_title).setVisibility(visibility); findViewById(R.id.recommended_addons).setVisibility(visibility); findViewById(R.id.all_addons_text).setVisibility(visibility); } private void setTopSitesVisibility(boolean visible, boolean hasTopSites) { int visibility = visible ? View.VISIBLE : View.GONE; int visibilityWithTopSites = visible && hasTopSites ? View.VISIBLE : View.GONE; int visibilityWithoutTopSites = visible && !hasTopSites ? View.VISIBLE : View.GONE; findViewById(R.id.top_sites_grid).setVisibility(visibilityWithTopSites); findViewById(R.id.top_sites_title).setVisibility(visibility); findViewById(R.id.all_top_sites_text).setVisibility(visibilityWithTopSites); findViewById(R.id.no_top_sites_text).setVisibility(visibilityWithoutTopSites); } private void setSyncVisibility(boolean visible) { int visibility = visible ? View.VISIBLE : View.GONE; findViewById(R.id.sync_box_container).setVisibility(visibility); } private void updateSyncLayout(boolean isFirstRun, boolean hasTopSites) { RelativeLayout syncContainer = (RelativeLayout) findViewById(R.id.sync_box_container); RelativeLayout.LayoutParams params = (RelativeLayout.LayoutParams) syncContainer.getLayoutParams(); int below = R.id.all_top_sites_text; if (isFirstRun && !hasTopSites) below = R.id.top_sites_top; else if (!hasTopSites) below = R.id.no_top_sites_text; int background = R.drawable.abouthome_bg_repeat; if (isFirstRun && !hasTopSites) background = 0; params.addRule(RelativeLayout.BELOW, below); syncContainer.setLayoutParams(params); syncContainer.setBackgroundResource(background); } private boolean isSyncSetup() { Account[] accounts = mAccountManager.getAccountsByType("org.mozilla.firefox_sync"); return accounts.length > 0; } private void updateLayout(GeckoApp.StartupMode startupMode, boolean syncIsSetup) { // The idea here is that we only show the sync invitation // on the very first run. Show sync banner below the top // sites section in all other cases. boolean hasTopSites = mTopSitesAdapter.getCount() > 0; boolean isFirstRun = (startupMode == GeckoApp.StartupMode.NEW_PROFILE); setTopSitesVisibility(!isFirstRun || hasTopSites, hasTopSites); setSyncVisibility(!syncIsSetup); updateSyncLayout(isFirstRun, hasTopSites); } private int getNumberOfTopSites() { Configuration config = getContext().getResources().getConfiguration(); if (config.orientation == Configuration.ORIENTATION_LANDSCAPE) return NUMBER_OF_TOP_SITES_LANDSCAPE; else return NUMBER_OF_TOP_SITES_PORTRAIT; } private int getNumberOfColumns() { Configuration config = getContext().getResources().getConfiguration(); if (config.orientation == Configuration.ORIENTATION_LANDSCAPE) return NUMBER_OF_COLS_LANDSCAPE; else return NUMBER_OF_COLS_PORTRAIT; } private void loadTopSites(final Activity activity) { if (mCursor != null) activity.stopManagingCursor(mCursor); // Ensure we initialize GeckoApp's startup mode in // background thread before we use it when updating // the top sites section layout in main thread. final GeckoApp.StartupMode startupMode = GeckoApp.mAppContext.getStartupMode(); // The isSyncSetup method should not be called on // UI thread as it touches disk to access a sqlite DB. final boolean syncIsSetup = isSyncSetup(); ContentResolver resolver = GeckoApp.mAppContext.getContentResolver(); mCursor = BrowserDB.getTopSites(resolver, NUMBER_OF_TOP_SITES_PORTRAIT); activity.startManagingCursor(mCursor); GeckoApp.mAppContext.mMainHandler.post(new Runnable() { public void run() { if (mTopSitesAdapter == null) { mTopSitesAdapter = new TopSitesCursorAdapter(activity, R.layout.abouthome_topsite_item, mCursor, new String[] { URLColumns.TITLE, URLColumns.THUMBNAIL }, new int[] { R.id.title, R.id.thumbnail }); mTopSitesAdapter.setViewBinder(new TopSitesViewBinder()); mTopSitesGrid.setAdapter(mTopSitesAdapter); } else { mTopSitesAdapter.changeCursor(mCursor); } mTopSitesGrid.setNumColumns(getNumberOfColumns()); updateLayout(startupMode, syncIsSetup); } }); } void update(final Activity activity, final EnumSet<UpdateFlags> flags) { GeckoAppShell.getHandler().post(new Runnable() { public void run() { if (flags.contains(UpdateFlags.TOP_SITES)) loadTopSites(activity); if (flags.contains(UpdateFlags.PREVIOUS_TABS)) readLastTabs(activity); if (flags.contains(UpdateFlags.RECOMMENDED_ADDONS)) readRecommendedAddons(activity); } }); } public void setUriLoadCallback(UriLoadCallback uriLoadCallback) { mUriLoadCallback = uriLoadCallback; } public void onActivityContentChanged(Activity activity) { update(activity, EnumSet.of(UpdateFlags.TOP_SITES)); } @Override public void onConfigurationChanged(Configuration newConfig) { if (mTopSitesGrid != null) mTopSitesGrid.setNumColumns(getNumberOfColumns()); if (mTopSitesAdapter != null) mTopSitesAdapter.notifyDataSetChanged(); super.onConfigurationChanged(newConfig); } private String readFromZipFile(Activity activity, String filename) { ZipFile zip = null; String str = null; try { InputStream fileStream = null; File applicationPackage = new File(activity.getApplication().getPackageResourcePath()); zip = new ZipFile(applicationPackage); if (zip == null) return null; ZipEntry fileEntry = zip.getEntry(filename); if (fileEntry == null) return null; fileStream = zip.getInputStream(fileEntry); str = readStringFromStream(fileStream); } catch (IOException ioe) { Log.e(LOGTAG, "error reading zip file: " + filename, ioe); } finally { try { if (zip != null) zip.close(); } catch (IOException ioe) { // catch this here because we can continue even if the // close failed Log.e(LOGTAG, "error closing zip filestream", ioe); } } return str; } private String readStringFromStream(InputStream fileStream) { String str = null; try { byte[] buf = new byte[32768]; StringBuffer jsonString = new StringBuffer(); int read = 0; while ((read = fileStream.read(buf, 0, 32768)) != -1) jsonString.append(new String(buf, 0, read)); str = jsonString.toString(); } catch (IOException ioe) { Log.i(LOGTAG, "error reading filestream", ioe); } finally { try { if (fileStream != null) fileStream.close(); } catch (IOException ioe) { // catch this here because we can continue even if the // close failed Log.e(LOGTAG, "error closing filestream", ioe); } } return str; } private String getPageUrlFromIconUrl(String iconUrl) { // Addon icon URLs come with a query argument that is usually // used for expiration purposes. We want the "page URL" here to be // stable enough to avoid unnecessary duplicate records of the // same addon. String pageUrl = iconUrl; try { URL urlForIcon = new URL(iconUrl); URL urlForPage = new URL(urlForIcon.getProtocol(), urlForIcon.getAuthority(), urlForIcon.getPath()); pageUrl = urlForPage.toString(); } catch (MalformedURLException e) { // Defaults to pageUrl = iconUrl in case of error } return pageUrl; } private void readRecommendedAddons(final Activity activity) { final String addonsFilename = "recommended-addons.json"; String jsonString; try { jsonString = GeckoApp.mAppContext.getProfile().readFile(addonsFilename); } catch (IOException ioe) { Log.i(LOGTAG, "filestream is null"); jsonString = readFromZipFile(activity, addonsFilename); } JSONArray addonsArray = null; if (jsonString != null) { try { addonsArray = new JSONObject(jsonString).getJSONArray("addons"); } catch (JSONException e) { Log.i(LOGTAG, "error reading json file", e); } } final JSONArray array = addonsArray; GeckoApp.mAppContext.mMainHandler.post(new Runnable() { public void run() { try { if (array == null || array.length() == 0) { setAddonsVisibility(false); return; } for (int i = 0; i < array.length(); i++) { JSONObject jsonobj = array.getJSONObject(i); final View row = mInflater.inflate(R.layout.abouthome_addon_row, mAddonsLayout, false); ((TextView) row.findViewById(R.id.addon_title)).setText(jsonobj.getString("name")); ((TextView) row.findViewById(R.id.addon_version)).setText(jsonobj.getString("version")); String iconUrl = jsonobj.getString("iconURL"); String pageUrl = getPageUrlFromIconUrl(iconUrl); final String homepageUrl = jsonobj.getString("homepageURL"); row.setOnClickListener(new OnClickListener() { public void onClick(View v) { if (mUriLoadCallback != null) mUriLoadCallback.callback(homepageUrl); } }); Favicons favicons = GeckoApp.mAppContext.mFavicons; favicons.loadFavicon(pageUrl, iconUrl, new Favicons.OnFaviconLoadedListener() { public void onFaviconLoaded(String url, Drawable favicon) { if (favicon != null) { ImageView icon = (ImageView) row.findViewById(R.id.addon_icon); icon.setImageDrawable(favicon); } } }); mAddonsLayout.addView(row); } setAddonsVisibility(true); } catch (JSONException e) { Log.i(LOGTAG, "error reading json file", e); } } }); } private void readLastTabs(final Activity activity) { String jsonString = GeckoApp.mAppContext.getProfile().readSessionFile(GeckoApp.sIsGeckoReady); if (jsonString == null) { // no previous session data return; } final JSONArray tabs; try { tabs = new JSONObject(jsonString).getJSONArray("windows").getJSONObject(0).getJSONArray("tabs"); } catch (JSONException e) { Log.i(LOGTAG, "error reading json file", e); return; } final ArrayList<String> lastTabUrlsList = new ArrayList<String>(); for (int i = 0; i < tabs.length(); i++) { final String title; final String url; try { JSONObject tab = tabs.getJSONObject(i); int index = tab.getInt("index"); JSONArray entries = tab.getJSONArray("entries"); JSONObject entry = entries.getJSONObject(index - 1); url = entry.getString("url"); String optTitle = entry.optString("title"); if (optTitle.length() == 0) title = url; else title = optTitle; } catch (JSONException e) { Log.e(LOGTAG, "error reading json file", e); continue; } // don't show last tabs for about pages if (url.startsWith("about:")) continue; ContentResolver resolver = GeckoApp.mAppContext.getContentResolver(); final BitmapDrawable favicon = BrowserDB.getFaviconForUrl(resolver, url); lastTabUrlsList.add(url); GeckoApp.mAppContext.mMainHandler.post(new Runnable() { public void run() { View container = mInflater.inflate(R.layout.abouthome_last_tabs_row, mLastTabsLayout, false); ((TextView) container.findViewById(R.id.last_tab_title)).setText(title); ((TextView) container.findViewById(R.id.last_tab_url)).setText(url); if (favicon != null) ((ImageView) container.findViewById(R.id.last_tab_favicon)).setImageDrawable(favicon); container.findViewById(R.id.last_tab_row).setOnClickListener(new OnClickListener() { public void onClick(View v) { GeckoApp.mAppContext.loadUrlInTab(url); } }); mLastTabsLayout.addView(container); } }); } int numLastTabs = lastTabUrlsList.size(); if (numLastTabs > 0) { GeckoApp.mAppContext.mMainHandler.post(new Runnable() { public void run() { findViewById(R.id.last_tabs_title).setVisibility(View.VISIBLE); } }); if (numLastTabs > 1) { GeckoApp.mAppContext.mMainHandler.post(new Runnable() { public void run() { LinkTextView openAll = (LinkTextView) findViewById(R.id.last_tabs_open_all); openAll.setVisibility(View.VISIBLE); openAll.setOnClickListener(new OnClickListener() { public void onClick(View v) { for (String url : lastTabUrlsList) GeckoApp.mAppContext.loadUrlInTab(url); } }); } }); } } } public static class TopSitesGridView extends GridView { /** From layout xml: * 80dip image height * + 2dip image paddingTop * + 1dip image padding (for bottom) * + 3dip marginTop on the TextView * +15dip TextView height * + 8dip vertical spacing in the GridView * ------ * 109dip total height per top site grid item */ private static final int kTopSiteItemHeight = 109; float mDisplayDensity; public TopSitesGridView(Context context, AttributeSet attrs) { super(context, attrs); DisplayMetrics dm = new DisplayMetrics(); GeckoApp.mAppContext.getWindowManager().getDefaultDisplay().getMetrics(dm); mDisplayDensity = dm.density; } @Override protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) { int numRows; SimpleCursorAdapter adapter = (SimpleCursorAdapter) getAdapter(); int nSites = Integer.MAX_VALUE; if (adapter != null) { Cursor c = adapter.getCursor(); if (c != null) nSites = c.getCount(); } Configuration config = getContext().getResources().getConfiguration(); if (config.orientation == Configuration.ORIENTATION_LANDSCAPE) { nSites = Math.min(nSites, NUMBER_OF_TOP_SITES_LANDSCAPE); numRows = (int) Math.round((double) nSites / NUMBER_OF_COLS_LANDSCAPE); } else { nSites = Math.min(nSites, NUMBER_OF_TOP_SITES_PORTRAIT); numRows = (int) Math.round((double) nSites / NUMBER_OF_COLS_PORTRAIT); } int expandedHeightSpec = MeasureSpec .makeMeasureSpec((int) (mDisplayDensity * numRows * kTopSiteItemHeight), MeasureSpec.EXACTLY); super.onMeasure(widthMeasureSpec, expandedHeightSpec); } } public class TopSitesCursorAdapter extends SimpleCursorAdapter { public TopSitesCursorAdapter(Context context, int layout, Cursor c, String[] from, int[] to) { super(context, layout, c, from, to); } @Override public int getCount() { return Math.min(super.getCount(), getNumberOfTopSites()); } } class TopSitesViewBinder implements SimpleCursorAdapter.ViewBinder { private boolean updateThumbnail(View view, Cursor cursor, int thumbIndex) { byte[] b = cursor.getBlob(thumbIndex); ImageView thumbnail = (ImageView) view; if (b == null) { thumbnail.setImageResource(R.drawable.tab_thumbnail_default); } else { try { Bitmap bitmap = BitmapFactory.decodeByteArray(b, 0, b.length); thumbnail.setImageBitmap(bitmap); } catch (OutOfMemoryError oom) { Log.e(LOGTAG, "Unable to load thumbnail bitmap", oom); thumbnail.setImageResource(R.drawable.tab_thumbnail_default); } } return true; } private boolean updateTitle(View view, Cursor cursor, int titleIndex) { String title = cursor.getString(titleIndex); TextView titleView = (TextView) view; // Use the URL instead of an empty title for consistency with the normal URL // bar view - this is the equivalent of getDisplayTitle() in Tab.java if (title == null || title.length() == 0) { int urlIndex = cursor.getColumnIndexOrThrow(URLColumns.URL); title = cursor.getString(urlIndex); } titleView.setText(title); return true; } @Override public boolean setViewValue(View view, Cursor cursor, int columnIndex) { int titleIndex = cursor.getColumnIndexOrThrow(URLColumns.TITLE); if (columnIndex == titleIndex) { return updateTitle(view, cursor, titleIndex); } int thumbIndex = cursor.getColumnIndexOrThrow(URLColumns.THUMBNAIL); if (columnIndex == thumbIndex) { return updateThumbnail(view, cursor, thumbIndex); } // Other columns are handled automatically return false; } } public static class LinkTextView extends TextView { public LinkTextView(Context context, AttributeSet attrs) { super(context, attrs); } @Override public void setText(CharSequence text, BufferType type) { SpannableString content = new SpannableString(text + " \u00BB"); content.setSpan(new UnderlineSpan(), 0, text.length(), 0); super.setText(content, BufferType.SPANNABLE); } } }