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/*
* Copyright (C) 2012 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.settings;
import android.app.Activity;
import android.content.ComponentName;
import android.content.Context;
import android.content.Intent;
import android.content.pm.PackageInfo;
import android.content.pm.PackageManager.NameNotFoundException;
import android.content.res.Resources.Theme;
import android.net.Uri;
import android.text.TextUtils;
import android.util.Log;
import android.util.TypedValue;
import android.view.Menu;
import android.view.MenuItem;
import android.view.MenuItem.OnMenuItemClickListener;
import java.net.URISyntaxException;
import java.util.Locale;
/**
* Functions to easily prepare contextual help menu option items with an intent that opens up the
* browser to a particular URL, while taking into account the preferred language and app version.
*/
public class HelpUtils {
private final static String TAG = HelpUtils.class.getSimpleName();
private static final int MENU_HELP = Menu.FIRST + 100;
/**
* Help URL query parameter key for the preferred language.
*/
private final static String PARAM_LANGUAGE_CODE = "hl";
/**
* Help URL query parameter key for the app version.
*/
private final static String PARAM_VERSION = "version";
// Constants for help intents.
private static final String EXTRA_CONTEXT = "EXTRA_CONTEXT";
private static final String EXTRA_THEME = "EXTRA_THEME";
private static final String EXTRA_PRIMARY_COLOR = "EXTRA_PRIMARY_COLOR";
private static final String EXTRA_BACKUP_URI = "EXTRA_BACKUP_URI";
/**
* Cached version code to prevent repeated calls to the package manager.
*/
private static String sCachedVersionCode = null;
/** Static helper that is not instantiable*/
private HelpUtils() { }
public static boolean prepareHelpMenuItem(Activity activity, Menu menu, String helpUri,
String backupContext) {
MenuItem helpItem = menu.add(0, MENU_HELP, 0, R.string.help_label);
return prepareHelpMenuItem(activity, helpItem, helpUri, backupContext);
}
public static boolean prepareHelpMenuItem(Activity activity, Menu menu, int helpUriResource,
String backupContext) {
MenuItem helpItem = menu.add(0, MENU_HELP, 0, R.string.help_label);
return prepareHelpMenuItem(activity, helpItem, activity.getString(helpUriResource),
backupContext);
}
/**
* Prepares the help menu item by doing the following.
* - If the helpUrlString is empty or null, the help menu item is made invisible.
* - Otherwise, this makes the help menu item visible and sets the intent for the help menu
* item to view the URL.
*
* @return returns whether the help menu item has been made visible.
*/
public static boolean prepareHelpMenuItem(final Activity activity, MenuItem helpMenuItem,
String helpUriString, String backupContext) {
if (TextUtils.isEmpty(helpUriString)) {
// The help url string is empty or null, so set the help menu item to be invisible.
helpMenuItem.setVisible(false);
// return that the help menu item is not visible (i.e. false)
return false;
} else {
final Intent intent = getHelpIntent(activity, helpUriString, backupContext);
// Set the intent to the help menu item, show the help menu item in the overflow
// menu, and make it visible.
if (intent != null) {
helpMenuItem.setOnMenuItemClickListener(new OnMenuItemClickListener() {
@Override
public boolean onMenuItemClick(MenuItem item) {
activity.startActivityForResult(intent, 0);
return true;
}
});
helpMenuItem.setShowAsAction(MenuItem.SHOW_AS_ACTION_NEVER);
helpMenuItem.setVisible(true);
} else {
helpMenuItem.setVisible(false);
return false;
}
// return that the help menu item is visible (i.e., true)
return true;
}
}
public static Intent getHelpIntent(Context context, String helpUriString,
String backupContext) {
// Try to handle as Intent Uri, otherwise just treat as Uri.
try {
Intent intent = Intent.parseUri(helpUriString,
Intent.URI_ANDROID_APP_SCHEME | Intent.URI_INTENT_SCHEME);
addIntentParameters(context, intent, backupContext);
ComponentName component = intent.resolveActivity(context.getPackageManager());
if (component != null) {
return intent;
} else if (intent.hasExtra(EXTRA_BACKUP_URI)) {
// This extra contains a backup URI for when the intent isn't available.
return getHelpIntent(context, intent.getStringExtra(EXTRA_BACKUP_URI),
backupContext);
} else {
return null;
}
} catch (URISyntaxException e) {
}
// The help url string exists, so first add in some extra query parameters.
final Uri fullUri = uriWithAddedParameters(context, Uri.parse(helpUriString));
// Then, create an intent that will be fired when the user
// selects this help menu item.
Intent intent = new Intent(Intent.ACTION_VIEW, fullUri);
intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK
| Intent.FLAG_ACTIVITY_EXCLUDE_FROM_RECENTS);
return intent;
}
private static void addIntentParameters(Context context, Intent intent, String backupContext) {
if (!intent.hasExtra(EXTRA_CONTEXT)) {
// Insert some context if none exists.
intent.putExtra(EXTRA_CONTEXT, backupContext);
}
intent.putExtra(EXTRA_THEME, 1 /* Light, dark action bar */);
Theme theme = context.getTheme();
TypedValue typedValue = new TypedValue();
theme.resolveAttribute(android.R.attr.colorPrimary, typedValue, true);
intent.putExtra(EXTRA_PRIMARY_COLOR, context.getColor(typedValue.resourceId));
}
/**
* Adds two query parameters into the Uri, namely the language code and the version code
* of the app's package as gotten via the context.
* @return the uri with added query parameters
*/
public static Uri uriWithAddedParameters(Context context, Uri baseUri) {
Uri.Builder builder = baseUri.buildUpon();
// Add in the preferred language
builder.appendQueryParameter(PARAM_LANGUAGE_CODE, Locale.getDefault().toString());
// Add in the package version code
if (sCachedVersionCode == null) {
// There is no cached version code, so try to get it from the package manager.
try {
// cache the version code
PackageInfo info = context.getPackageManager().getPackageInfo(
context.getPackageName(), 0);
sCachedVersionCode = Integer.toString(info.versionCode);
// append the version code to the uri
builder.appendQueryParameter(PARAM_VERSION, sCachedVersionCode);
} catch (NameNotFoundException e) {
// Cannot find the package name, so don't add in the version parameter
// This shouldn't happen.
Log.wtf(TAG, "Invalid package name for context", e);
}
} else {
builder.appendQueryParameter(PARAM_VERSION, sCachedVersionCode);
}
// Build the full uri and return it
return builder.build();
}
}
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