检测 Android 中的某个 Intent 是否有效

Question

1. /**
2. * Indicates whether the specified action can be used as an intent. This
3. * method queries the package manager for installed packages that can
4. * respond to an intent with the specified action. If no suitable package is
5. * found, this method returns false.
6. *
7. * @param context The application's environment.
8. * @param action The Intent action to check for availability.
9. *
10. * @return True if an Intent with the specified action can be sent and
11. *         responded to, false otherwise.
12. */
13. public static boolean isIntentAvailable(Context context, String action) {
14.     final PackageManager packageManager = context.getPackageManager();
15.     final Intent intent = new Intent(action);
16.     List<ResolveInfo> list =
17.             packageManager.queryIntentActivities(intent,
18.                     PackageManager.MATCH_DEFAULT_ONLY);
19.     return list.size() > 0;
20. }

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