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.mts2792.launcher; 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.content.pm.ResolveInfo; import android.graphics.Bitmap; import android.graphics.BitmapFactory; import android.text.TextUtils; import android.util.Base64; import android.util.Log; import com.mts2792.launcher.compat.LauncherActivityInfoCompat; import com.mts2792.launcher.compat.LauncherAppsCompat; import com.mts2792.launcher.compat.UserHandleCompat; import com.mts2792.launcher.compat.UserManagerCompat; import com.mts2792.launcher.util.PackageManagerHelper; import com.mts2792.launcher.util.Thunk; import org.json.JSONException; import org.json.JSONObject; import org.json.JSONStringer; import org.json.JSONTokener; import java.net.URISyntaxException; import java.util.ArrayList; import java.util.HashSet; import java.util.Iterator; import java.util.Set; public class InstallShortcutReceiver extends BroadcastReceiver { private static final String TAG = "InstallShortcutReceiver"; private static final boolean DBG = false; private static final String ACTION_INSTALL_SHORTCUT = "com.android.launcher.action.INSTALL_SHORTCUT"; private static final String LAUNCH_INTENT_KEY = "intent.launch"; private static final String NAME_KEY = "name"; private static final String ICON_KEY = "icon"; private static final String ICON_RESOURCE_NAME_KEY = "iconResource"; private static final String ICON_RESOURCE_PACKAGE_NAME_KEY = "iconResourcePackage"; private static final String APP_SHORTCUT_TYPE_KEY = "isAppShortcut"; private static final String USER_HANDLE_KEY = "userHandle"; // The set of shortcuts that are pending install private 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 = 85; private static final Object sLock = new Object(); private static void addToInstallQueue(SharedPreferences sharedPrefs, PendingInstallShortcutInfo info) { synchronized (sLock) { String encoded = info.encodeToString(); if (encoded != null) { Set<String> strings = sharedPrefs.getStringSet(APPS_PENDING_INSTALL, null); if (strings == null) { strings = new HashSet<String>(1); } else { strings = new HashSet<String>(strings); } strings.add(encoded); sharedPrefs.edit().putStringSet(APPS_PENDING_INSTALL, strings).apply(); } } } public static void removeFromInstallQueue(Context context, HashSet<String> packageNames, UserHandleCompat user) { if (packageNames.isEmpty()) { return; } SharedPreferences sp = Utilities.getPrefs(context); synchronized (sLock) { Set<String> strings = sp.getStringSet(APPS_PENDING_INSTALL, null); if (DBG) { Log.d(TAG, "APPS_PENDING_INSTALL: " + strings + ", removing packages: " + packageNames); } if (strings != null) { Set<String> newStrings = new HashSet<String>(strings); Iterator<String> newStringsIter = newStrings.iterator(); while (newStringsIter.hasNext()) { String encoded = newStringsIter.next(); PendingInstallShortcutInfo info = decode(encoded, context); if (info == null || (packageNames.contains(info.getTargetPackage()) && user.equals(info.user))) { newStringsIter.remove(); } } sp.edit().putStringSet(APPS_PENDING_INSTALL, newStrings).apply(); } } } private static ArrayList<PendingInstallShortcutInfo> getAndClearInstallQueue(SharedPreferences sharedPrefs, Context context) { synchronized (sLock) { Set<String> strings = sharedPrefs.getStringSet(APPS_PENDING_INSTALL, null); if (DBG) Log.d(TAG, "Getting and clearing APPS_PENDING_INSTALL: " + strings); if (strings == null) { return new ArrayList<PendingInstallShortcutInfo>(); } ArrayList<PendingInstallShortcutInfo> infos = new ArrayList<PendingInstallShortcutInfo>(); for (String encoded : strings) { PendingInstallShortcutInfo info = decode(encoded, context); if (info != null) { infos.add(info); } } sharedPrefs.edit().putStringSet(APPS_PENDING_INSTALL, new HashSet<String>()).apply(); return infos; } } // Determines whether to defer installing shortcuts immediately until // processAllPendingInstalls() is called. private static boolean mUseInstallQueue = false; public void onReceive(Context context, Intent data) { if (!ACTION_INSTALL_SHORTCUT.equals(data.getAction())) { return; } PendingInstallShortcutInfo info = createPendingInfo(context, data); if (info != null) { if (!info.isLauncherActivity()) { // Since its a custom shortcut, verify that it is safe to launch. if (!PackageManagerHelper.hasPermissionForActivity(context, info.launchIntent, null)) { // Target cannot be launched, or requires some special permission to launch Log.e(TAG, "Ignoring malicious intent " + info.launchIntent.toUri(0)); return; } } queuePendingShortcutInfo(info, context); } } /** * @return true is the extra is either null or is of type {@param type} */ private static boolean isValidExtraType(Intent intent, String key, Class type) { Object extra = intent.getParcelableExtra(key); return extra == null || type.isInstance(extra); } /** * Verifies the intent and creates a {@link PendingInstallShortcutInfo} */ private static PendingInstallShortcutInfo createPendingInfo(Context context, Intent data) { if (!isValidExtraType(data, Intent.EXTRA_SHORTCUT_INTENT, Intent.class) || !(isValidExtraType(data, Intent.EXTRA_SHORTCUT_ICON_RESOURCE, Intent.ShortcutIconResource.class)) || !(isValidExtraType(data, Intent.EXTRA_SHORTCUT_ICON, Bitmap.class))) { if (DBG) Log.e(TAG, "Invalid install shortcut intent"); return null; } PendingInstallShortcutInfo info = new PendingInstallShortcutInfo(data, context); if (info.launchIntent == null || info.label == null) { if (DBG) Log.e(TAG, "Invalid install shortcut intent"); return null; } return convertToLauncherActivityIfPossible(info); } public static ShortcutInfo fromShortcutIntent(Context context, Intent data) { PendingInstallShortcutInfo info = createPendingInfo(context, data); return info == null ? null : info.getShortcutInfo(); } private static void queuePendingShortcutInfo(PendingInstallShortcutInfo info, Context context) { // Queue the item up for adding if launcher has not loaded properly yet LauncherAppState app = LauncherAppState.getInstance(); boolean launcherNotLoaded = app.getModel().getCallback() == null; addToInstallQueue(Utilities.getPrefs(context), info); if (!mUseInstallQueue && !launcherNotLoaded) { flushInstallQueue(context); } } static void enableInstallQueue() { mUseInstallQueue = true; } static void disableAndFlushInstallQueue(Context context) { mUseInstallQueue = false; flushInstallQueue(context); } static void flushInstallQueue(Context context) { SharedPreferences sp = Utilities.getPrefs(context); ArrayList<PendingInstallShortcutInfo> installQueue = getAndClearInstallQueue(sp, context); if (!installQueue.isEmpty()) { Iterator<PendingInstallShortcutInfo> iter = installQueue.iterator(); ArrayList<ItemInfo> addShortcuts = new ArrayList<ItemInfo>(); while (iter.hasNext()) { final PendingInstallShortcutInfo pendingInfo = iter.next(); // If the intent specifies a package, make sure the package exists String packageName = pendingInfo.getTargetPackage(); if (!TextUtils.isEmpty(packageName)) { UserHandleCompat myUserHandle = UserHandleCompat.myUserHandle(); if (!LauncherModel.isValidPackage(context, packageName, myUserHandle)) { if (DBG) Log.d(TAG, "Ignoring shortcut for absent package: " + pendingInfo.launchIntent); continue; } } // Generate a shortcut info to add into the model addShortcuts.add(pendingInfo.getShortcutInfo()); } // Add the new apps to the model and bind them if (!addShortcuts.isEmpty()) { LauncherAppState app = LauncherAppState.getInstance(); app.getModel().addAndBindAddedWorkspaceItems(context, addShortcuts); } } } /** * Ensures that we have a valid, non-null name. If the provided name is null, we will return * the application name instead. */ @Thunk static CharSequence ensureValidName(Context context, Intent intent, CharSequence name) { if (name == null) { try { PackageManager pm = context.getPackageManager(); ActivityInfo info = pm.getActivityInfo(intent.getComponent(), 0); name = info.loadLabel(pm); } catch (PackageManager.NameNotFoundException nnfe) { return ""; } } return name; } private static class PendingInstallShortcutInfo { final LauncherActivityInfoCompat activityInfo; final Intent data; final Context mContext; final Intent launchIntent; final String label; final UserHandleCompat user; /** * Initializes a PendingInstallShortcutInfo received from a different app. */ public PendingInstallShortcutInfo(Intent data, Context context) { this.data = data; mContext = context; launchIntent = data.getParcelableExtra(Intent.EXTRA_SHORTCUT_INTENT); label = data.getStringExtra(Intent.EXTRA_SHORTCUT_NAME); user = UserHandleCompat.myUserHandle(); activityInfo = null; } /** * Initializes a PendingInstallShortcutInfo to represent a launcher target. */ public PendingInstallShortcutInfo(LauncherActivityInfoCompat info, Context context) { this.data = null; mContext = context; activityInfo = info; user = info.getUser(); launchIntent = AppInfo.makeLaunchIntent(context, info, user); label = info.getLabel().toString(); } public String encodeToString() { if (activityInfo != null) { try { // If it a launcher target, we only need component name, and user to // recreate this. return new JSONStringer().object().key(LAUNCH_INTENT_KEY).value(launchIntent.toUri(0)) .key(APP_SHORTCUT_TYPE_KEY).value(true).key(USER_HANDLE_KEY) .value(UserManagerCompat.getInstance(mContext).getSerialNumberForUser(user)).endObject() .toString(); } catch (JSONException e) { Log.d(TAG, "Exception when adding shortcut: " + e); return null; } } if (launchIntent.getAction() == null) { launchIntent.setAction(Intent.ACTION_VIEW); } else if (launchIntent.getAction().equals(Intent.ACTION_MAIN) && launchIntent.getCategories() != null && launchIntent.getCategories().contains(Intent.CATEGORY_LAUNCHER)) { launchIntent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK | Intent.FLAG_ACTIVITY_RESET_TASK_IF_NEEDED); } // This name is only used for comparisons and notifications, so fall back to activity // name if not supplied String name = ensureValidName(mContext, launchIntent, label).toString(); Bitmap icon = data.getParcelableExtra(Intent.EXTRA_SHORTCUT_ICON); Intent.ShortcutIconResource iconResource = data.getParcelableExtra(Intent.EXTRA_SHORTCUT_ICON_RESOURCE); // Only encode the parameters which are supported by the API. try { JSONStringer json = new JSONStringer().object().key(LAUNCH_INTENT_KEY).value(launchIntent.toUri(0)) .key(NAME_KEY).value(name); if (icon != null) { byte[] iconByteArray = Utilities.flattenBitmap(icon); json = json.key(ICON_KEY) .value(Base64.encodeToString(iconByteArray, 0, iconByteArray.length, Base64.DEFAULT)); } if (iconResource != null) { json = json.key(ICON_RESOURCE_NAME_KEY).value(iconResource.resourceName); json = json.key(ICON_RESOURCE_PACKAGE_NAME_KEY).value(iconResource.packageName); } return json.endObject().toString(); } catch (JSONException e) { Log.d(TAG, "Exception when adding shortcut: " + e); } return null; } public ShortcutInfo getShortcutInfo() { if (activityInfo != null) { return new ShortcutInfo(activityInfo, mContext); } else { return LauncherAppState.getInstance().getModel().infoFromShortcutIntent(mContext, data); } } public String getTargetPackage() { String packageName = launchIntent.getPackage(); if (packageName == null) { packageName = launchIntent.getComponent() == null ? null : launchIntent.getComponent().getPackageName(); } return packageName; } public boolean isLauncherActivity() { return activityInfo != null; } } private static PendingInstallShortcutInfo decode(String encoded, Context context) { try { JSONObject object = (JSONObject) new JSONTokener(encoded).nextValue(); Intent launcherIntent = Intent.parseUri(object.getString(LAUNCH_INTENT_KEY), 0); if (object.optBoolean(APP_SHORTCUT_TYPE_KEY)) { // The is an internal launcher target shortcut. UserHandleCompat user = UserManagerCompat.getInstance(context) .getUserForSerialNumber(object.getLong(USER_HANDLE_KEY)); if (user == null) { return null; } LauncherActivityInfoCompat info = LauncherAppsCompat.getInstance(context) .resolveActivity(launcherIntent, user); return info == null ? null : new PendingInstallShortcutInfo(info, context); } Intent data = new Intent(); data.putExtra(Intent.EXTRA_SHORTCUT_INTENT, launcherIntent); data.putExtra(Intent.EXTRA_SHORTCUT_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); } return new PendingInstallShortcutInfo(data, context); } catch (JSONException | URISyntaxException e) { Log.d(TAG, "Exception reading shortcut to add: " + e); } return null; } /** * Tries to create a new PendingInstallShortcutInfo which represents the same target, * but is an app target and not a shortcut. * @return the newly created info or the original one. */ private static PendingInstallShortcutInfo convertToLauncherActivityIfPossible( PendingInstallShortcutInfo original) { if (original.isLauncherActivity()) { // Already an activity target return original; } if (!Utilities.isLauncherAppTarget(original.launchIntent) || !original.user.equals(UserHandleCompat.myUserHandle())) { // We can only convert shortcuts which point to a main activity in the current user. return original; } PackageManager pm = original.mContext.getPackageManager(); ResolveInfo info = pm.resolveActivity(original.launchIntent, 0); if (info == null) { return original; } // Ignore any conflicts in the label name, as that can change based on locale. LauncherActivityInfoCompat launcherInfo = LauncherActivityInfoCompat.fromResolveInfo(info, original.mContext); return new PendingInstallShortcutInfo(launcherInfo, original.mContext); } }