Java Code Examples for android.content.pm.PackageManager#resolveActivity()

/**
 * Retrieve launcher activity name of the application from the context
 *
 * @param context The context of the application package.
 * @return launcher activity name of this application. From the
 *         "android:name" attribute.
 */
private static String getLauncherClassName(Context context) {
    PackageManager packageManager = context.getPackageManager();

    Intent intent = new Intent(Intent.ACTION_MAIN);
    // To limit the components this Intent will resolve to, by setting an
    // explicit package name.
    intent.setPackage(context.getPackageName());
    intent.addCategory(Intent.CATEGORY_LAUNCHER);

    // All Application must have 1 Activity at least.
    // Launcher activity must be found!
    ResolveInfo info = packageManager
            .resolveActivity(intent, PackageManager.MATCH_DEFAULT_ONLY);

    // get a ResolveInfo containing ACTION_MAIN, CATEGORY_LAUNCHER
    // if there is no Activity which has filtered by CATEGORY_DEFAULT
    if (info == null) {
        info = packageManager.resolveActivity(intent, 0);
    }

    return info.activityInfo.name;
}
 

/**
 * Given an AppTask retrieves the task class name.
 * @param task The app task to use.
 * @param pm The package manager to use for resolving intent.
 * @return Fully qualified class name or null if we were not able to
 * determine it.
 */
public static String getTaskClassName(AppTask task, PackageManager pm) {
    RecentTaskInfo info = getTaskInfoFromTask(task);
    if (info == null) return null;

    Intent baseIntent = info.baseIntent;
    if (baseIntent == null) {
        return null;
    } else if (baseIntent.getComponent() != null) {
        return baseIntent.getComponent().getClassName();
    } else {
        ResolveInfo resolveInfo = pm.resolveActivity(baseIntent, 0);
        if (resolveInfo == null) return null;
        return resolveInfo.activityInfo.name;
    }
}
 

private void handleIntentUrl(String intentUrl) {
	try {

		Intent intent = null;
		if (TextUtils.isEmpty(intentUrl) || !intentUrl.startsWith(INTENT_SCHEME))
			return;

		Activity mActivity = null;
		if ((mActivity = mWeakReference.get()) == null)
			return;
		PackageManager packageManager = mActivity.getPackageManager();
		intent = new Intent().parseUri(intentUrl, Intent.URI_INTENT_SCHEME);
		ResolveInfo info = packageManager.resolveActivity(intent, PackageManager.MATCH_DEFAULT_ONLY);
		LogUtils.i("Info", "resolveInfo:" + info + "   package:" + intent.getPackage());
		if (info != null) {  //跳到该应用
			mActivity.startActivity(intent);
			return;
		}
	} catch (Exception e) {
		e.printStackTrace();
	}


}
 

private static String getCurrentLauncherApp(Context context) {
    String str = "";
    PackageManager localPackageManager = context.getPackageManager();
    Intent intent = new Intent("android.intent.action.MAIN");
    intent.addCategory("android.intent.category.HOME");
    try {
        ResolveInfo resolveInfo = localPackageManager.resolveActivity(intent,
                PackageManager.MATCH_DEFAULT_ONLY);
        if (resolveInfo != null && resolveInfo.activityInfo != null) {
            str = resolveInfo.activityInfo.packageName;
        }
    } catch (Exception e) {
        Log.e("AppUtils", "Exception : " + e.getMessage());
    }
    return str;
}
 

/**
 * 判断是否存在指定的 Activity
 * @param packageName 应用包名
 * @param className   Activity.class.getCanonicalName()
 * @return {@code true} 存在, {@code false} 不存在
 */
public static boolean isActivityExists(final String packageName, final String className) {
    if (packageName == null || className == null) return false;
    boolean result = true;
    try {
        PackageManager packageManager = AppUtils.getPackageManager();
        Intent intent = new Intent();
        intent.setClassName(packageName, className);
        if (packageManager.resolveActivity(intent, 0) == null) {
            result = false;
        } else if (intent.resolveActivity(packageManager) == null) {
            result = false;
        } else {
            List<ResolveInfo> lists = packageManager.queryIntentActivities(intent, 0);
            if (lists.size() == 0) {
                result = false;
            }
        }
    } catch (Exception e) {
        result = false;
        LogPrintUtils.eTag(TAG, e, "isActivityExists");
    }
    return result;
}
 

private boolean isAvailable(final Context context,final Intent intent){
    final PackageManager manager = context.getPackageManager();

    final ResolveInfo info = manager.resolveActivity(
            intent, PackageManager.MATCH_DEFAULT_ONLY);
    return info != null;
}
 

public static void openUrl(Context context, String url) {
  Intent intent = new Intent(Intent.ACTION_VIEW, Uri.parse(url));
  PackageManager pm = context.getPackageManager();
  if (pm.resolveActivity(intent, 0) != null) {
    context.startActivity(intent);
  }
}
 

public boolean showInstallationDialog() {
    Intent playIntent = new Intent(Intent.ACTION_VIEW, Uri.parse("market://details?id=de.petendi.ethereum.android"));
    final PackageManager pm = context.getPackageManager();
    if (pm.resolveActivity(playIntent, 0) != null) {
        context.startActivity(playIntent);
        return true;
    } else {
        return false;
    }
}
 

private String getDefaultSmsPackage() {
    if(Build.VERSION.SDK_INT >= Build.VERSION_CODES.KITKAT) {
        return Telephony.Sms.getDefaultSmsPackage(reactContext);
    } else {
        String defApp = Settings.Secure.getString(reactContext.getContentResolver(), "sms_default_application");
        PackageManager pm = reactContext.getApplicationContext().getPackageManager();
        Intent iIntent = pm.getLaunchIntentForPackage(defApp);
        ResolveInfo mInfo = pm.resolveActivity(iIntent,0);
        return mInfo.activityInfo.packageName;
    }
}
 

@Override
public void onCreate(final Bundle icicle) {
    super.onCreate(icicle);
    addPreferencesFromResource(R.xml.prefs_screen_correction);

    final Context context = getActivity();
    final PackageManager pm = context.getPackageManager();

    /*
     * IndicKeyboard: We are not yet supporting dictionary download.
    final Preference dictionaryLink = findPreference(Settings.PREF_CONFIGURE_DICTIONARIES_KEY);
    final Intent intent = dictionaryLink.getIntent();
    intent.setClassName(context.getPackageName(), DictionarySettingsActivity.class.getName());
    final int number = pm.queryIntentActivities(intent, 0).size();
    if (0 >= number) {
    */
    if (true) {
        removePreference(Settings.PREF_CONFIGURE_DICTIONARIES_KEY);
    }

    final Preference editPersonalDictionary =
            findPreference(Settings.PREF_EDIT_PERSONAL_DICTIONARY);
    final Intent editPersonalDictionaryIntent = editPersonalDictionary.getIntent();
    final ResolveInfo ri = USE_INTERNAL_PERSONAL_DICTIONARY_SETTINGS ? null
            : pm.resolveActivity(
                    editPersonalDictionaryIntent, PackageManager.MATCH_DEFAULT_ONLY);
    if (ri == null) {
        overwriteUserDictionaryPreference(editPersonalDictionary);
    }

    mUseContactsPreference = (SwitchPreference) findPreference(Settings.PREF_KEY_USE_CONTACTS_DICT);
    turnOffUseContactsIfNoPermission();
}
 

/**
 * Uses package manager to find the package name of the device launcher. Usually this package
 * is "com.android.launcher" but can be different at times. This is a generic solution which
 * works on all platforms.`
 */
private String getLauncherPackageName() {
    // Create launcher Intent
    final Intent intent = new Intent(Intent.ACTION_MAIN);
    intent.addCategory(Intent.CATEGORY_HOME);

    // Use PackageManager to get the launcher package name
    PackageManager pm = InstrumentationRegistry.getContext().getPackageManager();
    ResolveInfo resolveInfo = pm.resolveActivity(intent, PackageManager.MATCH_DEFAULT_ONLY);
    return resolveInfo.activityInfo.packageName;
}
 

/** @param flags intersection of {@code PackageManager.ComponentInfoFlags} and {@code PackageManager.ResolveInfoFlags}. */
@OwnerUser @ProfileUser public static Set<String> detectCriticalSystemPackages(final PackageManager pm, final int flags) {
	final Stopwatch stopwatch = Performances.startUptimeStopwatch();

	final Set<String> critical_sys_pkgs = new HashSet<>(sCriticalSystemPkgs);

	// Detect package names for critical intent actions, as an addition to the white-list of well-known ones.
	for (final Intent intent : sCriticalActivityIntents) {
		@SuppressLint("WrongConstant") final ResolveInfo info = pm.resolveActivity(intent, MATCH_DEFAULT_ONLY | Hacks.MATCH_ANY_USER_AND_UNINSTALLED);
		if (info == null || (info.activityInfo.applicationInfo.flags & FLAG_SYSTEM) == 0) continue;
		final String pkg = info.activityInfo.packageName;
		Log.i(TAG, "Critical package for " + intent + ": " + pkg);
		critical_sys_pkgs.add(pkg);
	}
	Performances.check(stopwatch, 1, "CriticalActivities");

	// Detect package names for critical content providers, as an addition to the white-list of well-known ones.
	for (final String authority : sCriticalContentAuthorities) {
		if (authority == null) continue;		// Nullable for version-specific authorities
		final ProviderInfo provider = pm.resolveContentProvider(authority, flags);
		if (provider == null || (provider.applicationInfo.flags & FLAG_SYSTEM) == 0 || (provider.flags & FLAG_SINGLE_USER) != 0) continue;
		Log.i(TAG, "Critical package for authority \"" + authority + "\": " + provider.packageName);
		critical_sys_pkgs.add(provider.packageName);
	}
	Performances.check(stopwatch, 1, "CriticalProviders");

	return critical_sys_pkgs;
}
 

/**
 * Goes through all apps that handle VIEW intents and have a warmup service. Picks
 * the one chosen by the user if there is one, otherwise makes a best effort to return a
 * valid package name.
 *
 * This is <strong>not</strong> threadsafe.
 *
 * @param context {@link Context} to use for accessing {@link PackageManager}.
 * @return The package name recommended to use for connecting to custom tabs related components.
 */
public static String getPackageNameToUse(Context context) {
    if (sPackageNameToUse != null) return sPackageNameToUse;

    PackageManager pm = context.getPackageManager();
    // Get default VIEW intent handler.
    Intent activityIntent = new Intent(Intent.ACTION_VIEW, Uri.parse("http://www.example.com"));
    ResolveInfo defaultViewHandlerInfo = pm.resolveActivity(activityIntent, 0);
    String defaultViewHandlerPackageName = null;
    if (defaultViewHandlerInfo != null) {
        defaultViewHandlerPackageName = defaultViewHandlerInfo.activityInfo.packageName;
    }

    // Get all apps that can handle VIEW intents.
    List<ResolveInfo> resolvedActivityList = pm.queryIntentActivities(activityIntent, 0);
    List<String> packagesSupportingCustomTabs = new ArrayList<>();
    for (ResolveInfo info : resolvedActivityList) {
        Intent serviceIntent = new Intent();
        serviceIntent.setAction(ACTION_CUSTOM_TABS_CONNECTION);
        serviceIntent.setPackage(info.activityInfo.packageName);
        if (pm.resolveService(serviceIntent, 0) != null) {
            packagesSupportingCustomTabs.add(info.activityInfo.packageName);
        }
    }

    // Now packagesSupportingCustomTabs contains all apps that can handle both VIEW intents
    // and service calls.
    if (packagesSupportingCustomTabs.isEmpty()) {
        sPackageNameToUse = null;
    } else if (packagesSupportingCustomTabs.size() == 1) {
        sPackageNameToUse = packagesSupportingCustomTabs.get(0);
    } else if (!TextUtils.isEmpty(defaultViewHandlerPackageName)
            && !hasSpecializedHandlerIntents(context, activityIntent)
            && packagesSupportingCustomTabs.contains(defaultViewHandlerPackageName)) {
        sPackageNameToUse = defaultViewHandlerPackageName;
    } else if (packagesSupportingCustomTabs.contains(STABLE_PACKAGE)) {
        sPackageNameToUse = STABLE_PACKAGE;
    } else if (packagesSupportingCustomTabs.contains(BETA_PACKAGE)) {
        sPackageNameToUse = BETA_PACKAGE;
    } else if (packagesSupportingCustomTabs.contains(DEV_PACKAGE)) {
        sPackageNameToUse = DEV_PACKAGE;
    } else if (packagesSupportingCustomTabs.contains(LOCAL_PACKAGE)) {
        sPackageNameToUse = LOCAL_PACKAGE;
    }
    return sPackageNameToUse;
}
 

/**
 * Goes through all apps that handle VIEW intents and have a warmup service. Picks
 * the one chosen by the user if there is one, otherwise makes a best effort to return a
 * valid package name.
 *
 * This is <strong>not</strong> threadsafe.
 *
 * @param context {@link Context} to use for accessing {@link PackageManager}.
 * @return The package name recommended to use for connecting to custom tabs related components.
 */
public static String getPackageNameToUse(Context context) {
    if (SettingValues.linkHandlingMode != LinkHandlingMode.CUSTOM_TABS.getValue()) return null;
    if (sPackageNameToUse != null) return sPackageNameToUse;

    PackageManager pm = context.getPackageManager();
    // Get default VIEW intent handler.
    Intent activityIntent = new Intent(Intent.ACTION_VIEW, Uri.parse("http://www.example.com"));
    ResolveInfo defaultViewHandlerInfo = pm.resolveActivity(activityIntent, 0);
    String defaultViewHandlerPackageName = null;
    if (defaultViewHandlerInfo != null) {
        defaultViewHandlerPackageName = defaultViewHandlerInfo.activityInfo.packageName;
    }

    // Get all apps that can handle VIEW intents.
    List<ResolveInfo> resolvedActivityList = pm.queryIntentActivities(activityIntent, 0);
    List<String> packagesSupportingCustomTabs = new ArrayList<>();
    for (ResolveInfo info : resolvedActivityList) {
        Intent serviceIntent = new Intent();
        serviceIntent.setAction(ACTION_CUSTOM_TABS_CONNECTION);
        serviceIntent.setPackage(info.activityInfo.packageName);
        // Samsung browser custom tabs has a bug that harms user experience, pressing back
        // navigates between pages rather than exiting back to Slide
        // TODO: Reevaluate at a later date
        if (pm.resolveService(serviceIntent, 0) != null
                && !info.activityInfo.packageName.equals("com.sec.android.app.sbrowser")) {
            packagesSupportingCustomTabs.add(info.activityInfo.packageName);
        }
    }

    // Now packagesSupportingCustomTabs contains all apps that can handle both VIEW intents
    // and service calls.
    if (packagesSupportingCustomTabs.isEmpty()) {
        sPackageNameToUse = null;
    } else if (packagesSupportingCustomTabs.size() == 1) {
        sPackageNameToUse = packagesSupportingCustomTabs.get(0);
    } else if (!TextUtils.isEmpty(defaultViewHandlerPackageName)
            && !hasSpecializedHandlerIntents(context, activityIntent)
            && packagesSupportingCustomTabs.contains(defaultViewHandlerPackageName)) {
        sPackageNameToUse = defaultViewHandlerPackageName;
    } else if (packagesSupportingCustomTabs.contains(STABLE_PACKAGE)) {
        sPackageNameToUse = STABLE_PACKAGE;
    } else if (packagesSupportingCustomTabs.contains(BETA_PACKAGE)) {
        sPackageNameToUse = BETA_PACKAGE;
    } else if (packagesSupportingCustomTabs.contains(DEV_PACKAGE)) {
        sPackageNameToUse = DEV_PACKAGE;
    } else if (packagesSupportingCustomTabs.contains(LOCAL_PACKAGE)) {
        sPackageNameToUse = LOCAL_PACKAGE;
    }
    return sPackageNameToUse;
}
 

public static String getDefaultViewHandlerPackageName(Context context) {
    PackageManager pm = context.getPackageManager();
    // Get default VIEW intent handler.
    ResolveInfo defaultViewHandlerInfo = pm.resolveActivity(activityIntent, 0);
    return defaultViewHandlerInfo == null ? null : defaultViewHandlerInfo.activityInfo.packageName;
}
 

/**
 * Goes through all apps that handle VIEW intents and have a warmup service. Picks
 * the one chosen by the user if there is one, otherwise makes a best effort to return a
 * valid package name.
 *
 * This is <strong>not</strong> threadsafe.
 *
 * @param context {@link Context} to use for accessing {@link PackageManager}.
 * @return The package name recommended to use for connecting to custom tabs related components.
 */
@Nullable
public String getPackageNameToUse(Context context) {
    if (packageNameToUse != null) return packageNameToUse;

    PackageManager pm = context.getPackageManager();
    // Get default VIEW intent handler.
    Intent activityIntent = new Intent(Intent.ACTION_VIEW, Uri.parse("http://www.example.com"));
    ResolveInfo defaultViewHandlerInfo = pm.resolveActivity(activityIntent, 0);
    String defaultViewHandlerPackageName = null;
    if (defaultViewHandlerInfo != null) {
        defaultViewHandlerPackageName = defaultViewHandlerInfo.activityInfo.packageName;
    }

    // Get all apps that can handle VIEW intents.
    List<ResolveInfo> resolvedActivityList = pm.queryIntentActivities(activityIntent, 0);
    List<String> packagesSupportingCustomTabs = new ArrayList<>();
    for (ResolveInfo info : resolvedActivityList) {
        Intent serviceIntent = new Intent();
        serviceIntent.setAction(ACTION_CUSTOM_TABS_CONNECTION);
        serviceIntent.setPackage(info.activityInfo.packageName);
        if (pm.resolveService(serviceIntent, 0) != null) {
            packagesSupportingCustomTabs.add(info.activityInfo.packageName);
        }
    }

    // Now packagesSupportingCustomTabs contains all apps that can handle both VIEW intents
    // and service calls.
    if (packagesSupportingCustomTabs.isEmpty()) {
        packageNameToUse = null;
    } else if (packagesSupportingCustomTabs.size() == 1) {
        packageNameToUse = packagesSupportingCustomTabs.get(0);
    } else if (!TextUtils.isEmpty(defaultViewHandlerPackageName)
            && !hasSpecializedHandlerIntents(context, activityIntent)
            && packagesSupportingCustomTabs.contains(defaultViewHandlerPackageName)) {
        packageNameToUse = defaultViewHandlerPackageName;
    } else if (packagesSupportingCustomTabs.contains(STABLE_PACKAGE)) {
        packageNameToUse = STABLE_PACKAGE;
    } else if (packagesSupportingCustomTabs.contains(BETA_PACKAGE)) {
        packageNameToUse = BETA_PACKAGE;
    } else if (packagesSupportingCustomTabs.contains(DEV_PACKAGE)) {
        packageNameToUse = DEV_PACKAGE;
    } else if (packagesSupportingCustomTabs.contains(LOCAL_PACKAGE)) {
        packageNameToUse = LOCAL_PACKAGE;
    }
    return packageNameToUse;
}
 

public AllAppsGridAdapter(Launcher launcher, AlphabeticalAppsList apps,
        View.OnTouchListener touchListener, View.OnClickListener iconClickListener,
        View.OnLongClickListener iconLongClickListener) {
    Resources res = launcher.getResources();
    mLauncher = launcher;
    mApps = apps;
    mEmptySearchMessage = res.getString(R.string.all_apps_loading_message);
    mGridSizer = new GridSpanSizer();
    mGridLayoutMgr = new AppsGridLayoutManager(launcher);
    mGridLayoutMgr.setSpanSizeLookup(mGridSizer);
    mItemDecoration = new GridItemDecoration();
    mLayoutInflater = LayoutInflater.from(launcher);
    mTouchListener = touchListener;
    mIconClickListener = iconClickListener;
    mIconLongClickListener = iconLongClickListener;
    mSectionNamesMargin = mSectionStrategy ==
            AllAppsContainerView.SECTION_STRATEGY_GRID ?
            res.getDimensionPixelSize(R.dimen.all_apps_grid_view_start_margin) :
            res.getDimensionPixelSize(R.dimen.all_apps_grid_view_start_margin_with_sections);

    mAllAppsTextColor = mGridTheme == AllAppsContainerView.GRID_THEME_DARK ?
            res.getColor(R.color.quantum_panel_text_color_dark) :
            res.getColor(R.color.quantum_panel_text_color);

    mSectionHeaderOffset = res.getDimensionPixelSize(R.dimen.all_apps_grid_section_y_offset);

    mSectionTextPaint = new Paint();
    mSectionTextPaint.setTextSize(res.getDimensionPixelSize(
            R.dimen.all_apps_grid_section_text_size));
    int sectionTextColorId = mGridTheme == AllAppsContainerView.GRID_THEME_DARK ?
            R.color.all_apps_grid_section_text_color_dark :
            R.color.all_apps_grid_section_text_color;
    mSectionTextPaint.setColor(res.getColor(sectionTextColorId));
    mSectionTextPaint.setAntiAlias(true);

    mPredictedAppsDividerPaint = new Paint();
    mPredictedAppsDividerPaint.setStrokeWidth(Utilities.pxFromDp(1f, res.getDisplayMetrics()));
    mPredictedAppsDividerPaint.setColor(0x1E000000);
    mPredictedAppsDividerPaint.setAntiAlias(true);
    mPredictionBarDividerOffset =
            res.getDimensionPixelSize(R.dimen.all_apps_prediction_bar_divider_offset);

    // Resolve the market app handling additional searches
    PackageManager pm = launcher.getPackageManager();
    ResolveInfo marketInfo = pm.resolveActivity(createMarketSearchIntent(""),
            PackageManager.MATCH_DEFAULT_ONLY);
    if (marketInfo != null) {
        mMarketAppName = marketInfo.loadLabel(pm).toString();
    }

    mRemoteFolderManager = launcher.getRemoteFolderManager();
}
 

/**
 * Goes through all apps that handle VIEW intents and have a warmup service. Picks
 * the one chosen by the user if there is one, otherwise makes a best effort to return a
 * valid package name.
 * <p>
 * This is <strong>not</strong> threadsafe.
 *
 * @param context
 *         {@link Context} to use for accessing {@link PackageManager}.
 * @return The package name recommended to use for connecting to custom tabs related components.
 */
static String getPackageNameToUse(Context context) {
    if (sPackageNameToUse != null) return sPackageNameToUse;

    PackageManager pm = context.getPackageManager();
    // Get default VIEW intent handler.
    Intent activityIntent = new Intent(Intent.ACTION_VIEW, Uri.parse("http://www.example.com"));
    ResolveInfo defaultViewHandlerInfo = pm.resolveActivity(activityIntent, 0);
    String defaultViewHandlerPackageName = null;
    if (defaultViewHandlerInfo != null) {
        defaultViewHandlerPackageName = defaultViewHandlerInfo.activityInfo.packageName;
    }

    // Get all apps that can handle VIEW intents.
    List<ResolveInfo> resolvedActivityList = pm.queryIntentActivities(activityIntent, 0);
    List<String> packagesSupportingCustomTabs = new ArrayList<>();
    for (ResolveInfo info : resolvedActivityList) {
        Intent serviceIntent = new Intent();
        serviceIntent.setAction(ACTION_CUSTOM_TABS_CONNECTION);
        serviceIntent.setPackage(info.activityInfo.packageName);
        if (pm.resolveService(serviceIntent, 0) != null) {
            packagesSupportingCustomTabs.add(info.activityInfo.packageName);
        }
    }

    // Now packagesSupportingCustomTabs contains all apps that can handle both VIEW intents
    // and service calls.
    if (packagesSupportingCustomTabs.isEmpty()) {
        sPackageNameToUse = null;
    } else if (packagesSupportingCustomTabs.size() == 1) {
        sPackageNameToUse = packagesSupportingCustomTabs.get(0);
    } else if (!TextUtils.isEmpty(defaultViewHandlerPackageName)
            && !hasSpecializedHandlerIntents(context, activityIntent)
            && packagesSupportingCustomTabs.contains(defaultViewHandlerPackageName)) {
        sPackageNameToUse = defaultViewHandlerPackageName;
    } else if (packagesSupportingCustomTabs.contains(STABLE_PACKAGE)) {
        sPackageNameToUse = STABLE_PACKAGE;
    } else if (packagesSupportingCustomTabs.contains(BETA_PACKAGE)) {
        sPackageNameToUse = BETA_PACKAGE;
    } else if (packagesSupportingCustomTabs.contains(DEV_PACKAGE)) {
        sPackageNameToUse = DEV_PACKAGE;
    } else if (packagesSupportingCustomTabs.contains(LOCAL_PACKAGE)) {
        sPackageNameToUse = LOCAL_PACKAGE;
    }
    return sPackageNameToUse;
}
 

/**
 * Goes through all apps that handle VIEW intents and have a warmup service. Picks
 * the one chosen by the user if there is one, otherwise makes a best effort to return a
 * valid package name.
 *
 * This is <strong>not</strong> threadsafe.
 *
 * @param context {@link Context} to use for accessing {@link PackageManager}.
 * @return The package name recommended to use for connecting to custom tabs related components.
 */
public static String getPackageNameToUse(Context context) {
    if (sPackageNameToUse != null) return sPackageNameToUse;

    PackageManager pm = context.getPackageManager();
    // Get default VIEW intent handler.
    Intent activityIntent = new Intent(Intent.ACTION_VIEW, Uri.parse("http://www.example.com"));
    ResolveInfo defaultViewHandlerInfo = pm.resolveActivity(activityIntent, 0);
    String defaultViewHandlerPackageName = null;
    if (defaultViewHandlerInfo != null) {
        defaultViewHandlerPackageName = defaultViewHandlerInfo.activityInfo.packageName;
    }

    // Get all apps that can handle VIEW intents.
    List<ResolveInfo> resolvedActivityList = pm.queryIntentActivities(activityIntent, 0);
    List<String> packagesSupportingCustomTabs = new ArrayList<>();
    for (ResolveInfo info : resolvedActivityList) {
        Intent serviceIntent = new Intent();
        serviceIntent.setAction(ACTION_CUSTOM_TABS_CONNECTION);
        serviceIntent.setPackage(info.activityInfo.packageName);
        if (pm.resolveService(serviceIntent, 0) != null) {
            packagesSupportingCustomTabs.add(info.activityInfo.packageName);
        }
    }

    // Now packagesSupportingCustomTabs contains all apps that can handle both VIEW intents
    // and service calls.
    if (packagesSupportingCustomTabs.isEmpty()) {
        sPackageNameToUse = null;
    } else if (packagesSupportingCustomTabs.size() == 1) {
        sPackageNameToUse = packagesSupportingCustomTabs.get(0);
    } else if (!TextUtils.isEmpty(defaultViewHandlerPackageName)
            && !hasSpecializedHandlerIntents(context, activityIntent)
            && packagesSupportingCustomTabs.contains(defaultViewHandlerPackageName)) {
        sPackageNameToUse = defaultViewHandlerPackageName;
    } else if (packagesSupportingCustomTabs.contains(STABLE_PACKAGE)) {
        sPackageNameToUse = STABLE_PACKAGE;
    } else if (packagesSupportingCustomTabs.contains(BETA_PACKAGE)) {
        sPackageNameToUse = BETA_PACKAGE;
    } else if (packagesSupportingCustomTabs.contains(DEV_PACKAGE)) {
        sPackageNameToUse = DEV_PACKAGE;
    } else if (packagesSupportingCustomTabs.contains(LOCAL_PACKAGE)) {
        sPackageNameToUse = LOCAL_PACKAGE;
    }
    return sPackageNameToUse;
}
 

private boolean hasEqualizer() {
    final Intent effects = new Intent(AudioEffect.ACTION_DISPLAY_AUDIO_EFFECT_CONTROL_PANEL);
    PackageManager pm = getActivity().getPackageManager();
    ResolveInfo ri = pm.resolveActivity(effects, 0);
    return ri != null;
}