安卓判断快捷方式是否存在

public static boolean isAddShortCut(Context context) {
??????? boolean isInstallShortcut = false;
??????? final ContentResolver cr = context.getContentResolver();
??????? String AUTHORITY = getAuthorityFromPermission(context,"com.android.launcher.permission.READ_SETTINGS");
??????? final Uri CONTENT_URI = Uri.parse("content://" + AUTHORITY + "/favorites?notify=true");

??????? Cursor c = cr.query(CONTENT_URI,new String[] {"title"},"title=?",new String[] {context.getString(R.string.app_name)},null);

??????? if (c != null && c.getCount() > 0) {
??????????? isInstallShortcut = true;
??????? }

??????? if (c != null) {
??????????? c.close();
??????? }
??????? return isInstallShortcut;
??? }

??? public static String getAuthorityFromPermission(Context context,String permission) {
??????? if (TextUtils.isEmpty(permission)) {
??????????? return null;
??????? }
??????? List<PackageInfo> packInfos = context.getPackageManager().getInstalledPackages(PackageManager.GET_PROVIDERS);
??????? if (packInfos == null) {
??????????? return null;
??????? }
??????? for (PackageInfo info : packInfos) {
??????????? ProviderInfo[] providers = info.providers;
??????????? if (providers != null) {
??????????????? for (ProviderInfo provider : providers) {
??????????????????? if (permission.equals(provider.readPermission) || permission.equals(provider.writePermission)) {
??????????????????????? return provider.authority;
??????????????????? }
??????????????? }
??????????? }
??????? }
??????? return null;
??? }