Android How to put Map in an intent

Question

I have a `Map` object and I want to put it in an intent to start a `Service`: ``` Map modules = new HashMap(); Intent downloadServiceIntent = new Intent(context.getApplicationContext(), DownloadService.class); downloadServiceIntent.putExtra("EXTRA_MODULE", modules); context.startService(downloadServiceIntent); ``` I think I could break the `Map` into two arrays (`int[]` and `String[]`), then put them in intent. For example: ``` int[] keys = new int[modules.size()]; String[] values = new String[modules.size()]; int i = 0; for (Map.Entry entry : modules.entrySet()) { keys[i] = entry.getKey(); values[i] = entry.getValue(); i++; } downloadServiceIntent.putExtra("EXTRA_KEYS", keys); downloadServiceIntent.putExtra("EXTRA_VALUES", values); ``` Is it a good idea? Is there any alternative ways to achieve this?

Accepted Answer

You can put a serializable as extra [1]. And HashMap for example does implement the serializable interface [2]. So if you change your variable type from Map to HashMap you can put your map directly as extra.

[1] http://developer.android.com/reference/android/content/Intent.html#putExtra(java.lang.String,%20java.io.Serializable) [2] https://docs.oracle.com/javase/7/docs/api/java/util/HashMap.html

Android How to put Map<V,T> in an intent

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