Java tutorial
/* * Copyright (C) 2008 The Android Open Source Project * * Licensed under the Apache License, Version 2.0 (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.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */ package com.android.launcher2; import android.content.BroadcastReceiver; import android.content.Context; import android.content.Intent; import android.content.SharedPreferences; import android.content.pm.ActivityInfo; import android.content.pm.PackageManager; import android.graphics.Bitmap; import android.graphics.BitmapFactory; import android.util.Base64; import android.util.Log; import android.widget.Toast; import com.android.launcher.R; import java.util.ArrayList; import java.util.HashSet; import java.util.Iterator; import java.util.Set; import org.json.*; public class InstallShortcutReceiver extends BroadcastReceiver { public static final String ACTION_INSTALL_SHORTCUT = "com.android.launcher.action.INSTALL_SHORTCUT"; public static final String NEW_APPS_PAGE_KEY = "apps.new.page"; public static final String NEW_APPS_LIST_KEY = "apps.new.list"; public static final String DATA_INTENT_KEY = "intent.data"; public static final String LAUNCH_INTENT_KEY = "intent.launch"; public static final String NAME_KEY = "name"; public static final String ICON_KEY = "icon"; public static final String ICON_RESOURCE_NAME_KEY = "iconResource"; public static final String ICON_RESOURCE_PACKAGE_NAME_KEY = "iconResourcePackage"; // The set of shortcuts that are pending install public static final String APPS_PENDING_INSTALL = "apps_to_install"; public static final int NEW_SHORTCUT_BOUNCE_DURATION = 450; public static final int NEW_SHORTCUT_STAGGER_DELAY = 75; private static final int INSTALL_SHORTCUT_SUCCESSFUL = 0; private static final int INSTALL_SHORTCUT_IS_DUPLICATE = -1; private static final int INSTALL_SHORTCUT_NO_SPACE = -2; // A mime-type representing shortcut data public static final String SHORTCUT_MIMETYPE = "com.android.launcher/shortcut"; private static Object sLock = new Object(); private static void addToStringSet(SharedPreferences sharedPrefs, SharedPreferences.Editor editor, String key, String value) { Set<String> strings = sharedPrefs.getStringSet(key, null); if (strings == null) { strings = new HashSet<String>(0); } else { strings = new HashSet<String>(strings); } strings.add(value); editor.putStringSet(key, strings); } private static void addToInstallQueue(SharedPreferences sharedPrefs, PendingInstallShortcutInfo info) { synchronized (sLock) { try { JSONStringer json = new JSONStringer().object().key(DATA_INTENT_KEY).value(info.data.toUri(0)) .key(LAUNCH_INTENT_KEY).value(info.launchIntent.toUri(0)).key(NAME_KEY).value(info.name); if (info.icon != null) { byte[] iconByteArray = ItemInfo.flattenBitmap(info.icon); json = json.key(ICON_KEY) .value(Base64.encodeToString(iconByteArray, 0, iconByteArray.length, Base64.DEFAULT)); } if (info.iconResource != null) { json = json.key(ICON_RESOURCE_NAME_KEY).value(info.iconResource.resourceName); json = json.key(ICON_RESOURCE_PACKAGE_NAME_KEY).value(info.iconResource.packageName); } json = json.endObject(); SharedPreferences.Editor editor = sharedPrefs.edit(); addToStringSet(sharedPrefs, editor, APPS_PENDING_INSTALL, json.toString()); editor.commit(); } catch (org.json.JSONException e) { Log.d("InstallShortcutReceiver", "Exception when adding shortcut: " + e); } } } private static ArrayList<PendingInstallShortcutInfo> getAndClearInstallQueue(SharedPreferences sharedPrefs) { synchronized (sLock) { Set<String> strings = sharedPrefs.getStringSet(APPS_PENDING_INSTALL, null); if (strings == null) { return new ArrayList<PendingInstallShortcutInfo>(); } ArrayList<PendingInstallShortcutInfo> infos = new ArrayList<PendingInstallShortcutInfo>(); for (String json : strings) { try { JSONObject object = (JSONObject) new JSONTokener(json).nextValue(); Intent data = Intent.parseUri(object.getString(DATA_INTENT_KEY), 0); Intent launchIntent = Intent.parseUri(object.getString(LAUNCH_INTENT_KEY), 0); String name = object.getString(NAME_KEY); String iconBase64 = object.optString(ICON_KEY); String iconResourceName = object.optString(ICON_RESOURCE_NAME_KEY); String iconResourcePackageName = object.optString(ICON_RESOURCE_PACKAGE_NAME_KEY); if (iconBase64 != null && !iconBase64.isEmpty()) { byte[] iconArray = Base64.decode(iconBase64, Base64.DEFAULT); Bitmap b = BitmapFactory.decodeByteArray(iconArray, 0, iconArray.length); data.putExtra(Intent.EXTRA_SHORTCUT_ICON, b); } else if (iconResourceName != null && !iconResourceName.isEmpty()) { Intent.ShortcutIconResource iconResource = new Intent.ShortcutIconResource(); iconResource.resourceName = iconResourceName; iconResource.packageName = iconResourcePackageName; data.putExtra(Intent.EXTRA_SHORTCUT_ICON_RESOURCE, iconResource); } data.putExtra(Intent.EXTRA_SHORTCUT_INTENT, launchIntent); PendingInstallShortcutInfo info = new PendingInstallShortcutInfo(data, name, launchIntent); infos.add(info); } catch (org.json.JSONException e) { Log.d("InstallShortcutReceiver", "Exception reading shortcut to add: " + e); } catch (java.net.URISyntaxException e) { Log.d("InstallShortcutReceiver", "Exception reading shortcut to add: " + e); } } sharedPrefs.edit().putStringSet(APPS_PENDING_INSTALL, new HashSet<String>()).commit(); return infos; } } // Determines whether to defer installing shortcuts immediately until // processAllPendingInstalls() is called. private static boolean mUseInstallQueue = false; private static class PendingInstallShortcutInfo { Intent data; Intent launchIntent; String name; Bitmap icon; Intent.ShortcutIconResource iconResource; public PendingInstallShortcutInfo(Intent rawData, String shortcutName, Intent shortcutIntent) { data = rawData; name = shortcutName; launchIntent = shortcutIntent; } } public void onReceive(Context context, Intent data) { if (!ACTION_INSTALL_SHORTCUT.equals(data.getAction())) { return; } Intent intent = data.getParcelableExtra(Intent.EXTRA_SHORTCUT_INTENT); if (intent == null) { return; } // This name is only used for comparisons and notifications, so fall back to activity name // if not supplied String name = data.getStringExtra(Intent.EXTRA_SHORTCUT_NAME); if (name == null) { try { PackageManager pm = context.getPackageManager(); ActivityInfo info = pm.getActivityInfo(intent.getComponent(), 0); name = info.loadLabel(pm).toString(); } catch (PackageManager.NameNotFoundException nnfe) { return; } } Bitmap icon = data.getParcelableExtra(Intent.EXTRA_SHORTCUT_ICON); Intent.ShortcutIconResource iconResource = data.getParcelableExtra(Intent.EXTRA_SHORTCUT_ICON_RESOURCE); // Queue the item up for adding if launcher has not loaded properly yet boolean launcherNotLoaded = LauncherModel.getCellCountX() <= 0 || LauncherModel.getCellCountY() <= 0; PendingInstallShortcutInfo info = new PendingInstallShortcutInfo(data, name, intent); info.icon = icon; info.iconResource = iconResource; if (mUseInstallQueue || launcherNotLoaded) { String spKey = LauncherApplication.getSharedPreferencesKey(); SharedPreferences sp = context.getSharedPreferences(spKey, Context.MODE_PRIVATE); addToInstallQueue(sp, info); } else { processInstallShortcut(context, info); } } static void enableInstallQueue() { mUseInstallQueue = true; } static void disableAndFlushInstallQueue(Context context) { mUseInstallQueue = false; flushInstallQueue(context); } static void flushInstallQueue(Context context) { String spKey = LauncherApplication.getSharedPreferencesKey(); SharedPreferences sp = context.getSharedPreferences(spKey, Context.MODE_PRIVATE); ArrayList<PendingInstallShortcutInfo> installQueue = getAndClearInstallQueue(sp); Iterator<PendingInstallShortcutInfo> iter = installQueue.iterator(); while (iter.hasNext()) { processInstallShortcut(context, iter.next()); } } private static void processInstallShortcut(Context context, PendingInstallShortcutInfo pendingInfo) { String spKey = LauncherApplication.getSharedPreferencesKey(); SharedPreferences sp = context.getSharedPreferences(spKey, Context.MODE_PRIVATE); final Intent data = pendingInfo.data; final Intent intent = pendingInfo.launchIntent; final String name = pendingInfo.name; // Lock on the app so that we don't try and get the items while apps are being added LauncherApplication app = (LauncherApplication) context.getApplicationContext(); final int[] result = { INSTALL_SHORTCUT_SUCCESSFUL }; boolean found = false; synchronized (app) { // Flush the LauncherModel worker thread, so that if we just did another // processInstallShortcut, we give it time for its shortcut to get added to the // database (getItemsInLocalCoordinates reads the database) app.getModel().flushWorkerThread(); final ArrayList<ItemInfo> items = LauncherModel.getItemsInLocalCoordinates(context); final boolean exists = LauncherModel.shortcutExists(context, name, intent); // Try adding to the workspace screens incrementally, starting at the default or center // screen and alternating between +1, -1, +2, -2, etc. (using ~ ceil(i/2f)*(-1)^(i-1)) final int screen = Launcher.DEFAULT_SCREEN; for (int i = 0; i < (2 * Launcher.SCREEN_COUNT) + 1 && !found; ++i) { int si = screen + (int) ((i / 2f) + 0.5f) * ((i % 2 == 1) ? 1 : -1); if (0 <= si && si < Launcher.SCREEN_COUNT) { found = installShortcut(context, data, items, name, intent, si, exists, sp, result); } } } // We only report error messages (duplicate shortcut or out of space) as the add-animation // will provide feedback otherwise if (!found) { if (result[0] == INSTALL_SHORTCUT_NO_SPACE) { Toast.makeText(context, context.getString(R.string.completely_out_of_space), Toast.LENGTH_SHORT) .show(); } else if (result[0] == INSTALL_SHORTCUT_IS_DUPLICATE) { Toast.makeText(context, context.getString(R.string.shortcut_duplicate, name), Toast.LENGTH_SHORT) .show(); } } } private static boolean installShortcut(Context context, Intent data, ArrayList<ItemInfo> items, String name, final Intent intent, final int screen, boolean shortcutExists, final SharedPreferences sharedPrefs, int[] result) { int[] tmpCoordinates = new int[2]; if (findEmptyCell(context, items, tmpCoordinates, screen)) { if (intent != null) { if (intent.getAction() == null) { intent.setAction(Intent.ACTION_VIEW); } else if (intent.getAction().equals(Intent.ACTION_MAIN) && intent.getCategories() != null && intent.getCategories().contains(Intent.CATEGORY_LAUNCHER)) { intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK | Intent.FLAG_ACTIVITY_RESET_TASK_IF_NEEDED); } // By default, we allow for duplicate entries (located in // different places) boolean duplicate = data.getBooleanExtra(Launcher.EXTRA_SHORTCUT_DUPLICATE, true); if (duplicate || !shortcutExists) { new Thread("setNewAppsThread") { public void run() { synchronized (sLock) { // If the new app is going to fall into the same page as before, // then just continue adding to the current page final int newAppsScreen = sharedPrefs.getInt(NEW_APPS_PAGE_KEY, screen); SharedPreferences.Editor editor = sharedPrefs.edit(); if (newAppsScreen == -1 || newAppsScreen == screen) { addToStringSet(sharedPrefs, editor, NEW_APPS_LIST_KEY, intent.toUri(0)); } editor.putInt(NEW_APPS_PAGE_KEY, screen); editor.commit(); } } }.start(); // Update the Launcher db LauncherApplication app = (LauncherApplication) context.getApplicationContext(); ShortcutInfo info = app.getModel().addShortcut(context, data, LauncherSettings.Favorites.CONTAINER_DESKTOP, screen, tmpCoordinates[0], tmpCoordinates[1], true); if (info == null) { return false; } } else { result[0] = INSTALL_SHORTCUT_IS_DUPLICATE; } return true; } } else { result[0] = INSTALL_SHORTCUT_NO_SPACE; } return false; } private static boolean findEmptyCell(Context context, ArrayList<ItemInfo> items, int[] xy, int screen) { final int xCount = LauncherModel.getCellCountX(); final int yCount = LauncherModel.getCellCountY(); boolean[][] occupied = new boolean[xCount][yCount]; ItemInfo item = null; int cellX, cellY, spanX, spanY; for (int i = 0; i < items.size(); ++i) { item = items.get(i); if (item.container == LauncherSettings.Favorites.CONTAINER_DESKTOP) { if (item.screen == screen) { cellX = item.cellX; cellY = item.cellY; spanX = item.spanX; spanY = item.spanY; for (int x = cellX; 0 <= x && x < cellX + spanX && x < xCount; x++) { for (int y = cellY; 0 <= y && y < cellY + spanY && y < yCount; y++) { occupied[x][y] = true; } } } } } return CellLayout.findVacantCell(xy, 1, 1, xCount, yCount, occupied); } }