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/*
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* Copyright (C) 2012 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package com.android.settings;
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import android.app.Activity;
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import android.content.ComponentName;
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import android.content.Context;
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import android.content.Intent;
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import android.content.pm.PackageInfo;
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import android.content.pm.PackageManager.NameNotFoundException;
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import android.content.res.Resources.Theme;
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import android.net.Uri;
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import android.text.TextUtils;
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import android.util.Log;
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import android.util.TypedValue;
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import android.view.Menu;
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import android.view.MenuItem;
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import android.view.MenuItem.OnMenuItemClickListener;
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import java.net.URISyntaxException;
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import java.util.Locale;
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/**
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* Functions to easily prepare contextual help menu option items with an intent that opens up the
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* browser to a particular URL, while taking into account the preferred language and app version.
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*/
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public class HelpUtils {
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private final static String TAG = HelpUtils.class.getSimpleName();
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private static final int MENU_HELP = Menu.FIRST + 100;
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/**
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* Help URL query parameter key for the preferred language.
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*/
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private final static String PARAM_LANGUAGE_CODE = "hl";
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/**
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* Help URL query parameter key for the app version.
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*/
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private final static String PARAM_VERSION = "version";
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// Constants for help intents.
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private static final String EXTRA_CONTEXT = "EXTRA_CONTEXT";
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private static final String EXTRA_THEME = "EXTRA_THEME";
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private static final String EXTRA_PRIMARY_COLOR = "EXTRA_PRIMARY_COLOR";
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private static final String EXTRA_BACKUP_URI = "EXTRA_BACKUP_URI";
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/**
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* Cached version code to prevent repeated calls to the package manager.
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*/
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private static String sCachedVersionCode = null;
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/** Static helper that is not instantiable*/
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private HelpUtils() { }
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public static boolean prepareHelpMenuItem(Activity activity, Menu menu, String helpUri,
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String backupContext) {
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MenuItem helpItem = menu.add(0, MENU_HELP, 0, R.string.help_label);
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return prepareHelpMenuItem(activity, helpItem, helpUri, backupContext);
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}
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public static boolean prepareHelpMenuItem(Activity activity, Menu menu, int helpUriResource,
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String backupContext) {
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MenuItem helpItem = menu.add(0, MENU_HELP, 0, R.string.help_label);
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return prepareHelpMenuItem(activity, helpItem, activity.getString(helpUriResource),
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backupContext);
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}
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/**
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* Prepares the help menu item by doing the following.
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* - If the helpUrlString is empty or null, the help menu item is made invisible.
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* - Otherwise, this makes the help menu item visible and sets the intent for the help menu
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* item to view the URL.
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*
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* @return returns whether the help menu item has been made visible.
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*/
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public static boolean prepareHelpMenuItem(final Activity activity, MenuItem helpMenuItem,
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String helpUriString, String backupContext) {
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if (TextUtils.isEmpty(helpUriString)) {
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// The help url string is empty or null, so set the help menu item to be invisible.
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helpMenuItem.setVisible(false);
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// return that the help menu item is not visible (i.e. false)
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return false;
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} else {
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final Intent intent = getHelpIntent(activity, helpUriString, backupContext);
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// Set the intent to the help menu item, show the help menu item in the overflow
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// menu, and make it visible.
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if (intent != null) {
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helpMenuItem.setOnMenuItemClickListener(new OnMenuItemClickListener() {
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@Override
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public boolean onMenuItemClick(MenuItem item) {
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activity.startActivityForResult(intent, 0);
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return true;
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}
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});
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helpMenuItem.setShowAsAction(MenuItem.SHOW_AS_ACTION_NEVER);
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helpMenuItem.setVisible(true);
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} else {
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helpMenuItem.setVisible(false);
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return false;
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}
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// return that the help menu item is visible (i.e., true)
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return true;
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}
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}
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public static Intent getHelpIntent(Context context, String helpUriString,
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String backupContext) {
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// Try to handle as Intent Uri, otherwise just treat as Uri.
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try {
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Intent intent = Intent.parseUri(helpUriString,
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Intent.URI_ANDROID_APP_SCHEME | Intent.URI_INTENT_SCHEME);
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addIntentParameters(context, intent, backupContext);
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ComponentName component = intent.resolveActivity(context.getPackageManager());
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if (component != null) {
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return intent;
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} else if (intent.hasExtra(EXTRA_BACKUP_URI)) {
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// This extra contains a backup URI for when the intent isn't available.
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return getHelpIntent(context, intent.getStringExtra(EXTRA_BACKUP_URI),
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backupContext);
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} else {
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return null;
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}
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} catch (URISyntaxException e) {
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}
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// The help url string exists, so first add in some extra query parameters.
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final Uri fullUri = uriWithAddedParameters(context, Uri.parse(helpUriString));
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// Then, create an intent that will be fired when the user
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// selects this help menu item.
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Intent intent = new Intent(Intent.ACTION_VIEW, fullUri);
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intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK
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| Intent.FLAG_ACTIVITY_EXCLUDE_FROM_RECENTS);
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return intent;
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}
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private static void addIntentParameters(Context context, Intent intent, String backupContext) {
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if (!intent.hasExtra(EXTRA_CONTEXT)) {
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// Insert some context if none exists.
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intent.putExtra(EXTRA_CONTEXT, backupContext);
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}
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intent.putExtra(EXTRA_THEME, 1 /* Light, dark action bar */);
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Theme theme = context.getTheme();
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TypedValue typedValue = new TypedValue();
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theme.resolveAttribute(android.R.attr.colorPrimary, typedValue, true);
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intent.putExtra(EXTRA_PRIMARY_COLOR, context.getColor(typedValue.resourceId));
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}
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/**
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* Adds two query parameters into the Uri, namely the language code and the version code
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* of the app's package as gotten via the context.
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* @return the uri with added query parameters
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*/
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public static Uri uriWithAddedParameters(Context context, Uri baseUri) {
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Uri.Builder builder = baseUri.buildUpon();
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// Add in the preferred language
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builder.appendQueryParameter(PARAM_LANGUAGE_CODE, Locale.getDefault().toString());
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// Add in the package version code
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if (sCachedVersionCode == null) {
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// There is no cached version code, so try to get it from the package manager.
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try {
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// cache the version code
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PackageInfo info = context.getPackageManager().getPackageInfo(
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context.getPackageName(), 0);
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sCachedVersionCode = Integer.toString(info.versionCode);
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// append the version code to the uri
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builder.appendQueryParameter(PARAM_VERSION, sCachedVersionCode);
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} catch (NameNotFoundException e) {
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// Cannot find the package name, so don't add in the version parameter
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// This shouldn't happen.
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Log.wtf(TAG, "Invalid package name for context", e);
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}
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} else {
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builder.appendQueryParameter(PARAM_VERSION, sCachedVersionCode);
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}
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// Build the full uri and return it
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return builder.build();
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}
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}
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Suprabh Shukla
Android (Google) Code Review