Android如何放置Map< V，T>意向 [英] Android How to put Map<V,T> in an intent

问题描述

我有一个Map对象，我想将其放入启动Service的意图:

I have a Map object and I want to put it in an intent to start a Service:

Map<Integer, String> modules = new HashMap<Integer, String>();
Intent downloadServiceIntent = new Intent(context.getApplicationContext(), DownloadService.class);
downloadServiceIntent.putExtra("EXTRA_MODULE", modules);
context.startService(downloadServiceIntent);

我想我可以将Map分成两个数组(int[]和String[])，然后将它们放入意图中.例如:

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<Integer, String> entry : modules.entrySet()) {
    keys[i] = entry.getKey();
    values[i] = entry.getValue();
    i++;
}
downloadServiceIntent.putExtra("EXTRA_KEYS", keys);
downloadServiceIntent.putExtra("EXTRA_VALUES", values);

这是个好主意吗?有其他替代方法可以实现这一目标吗?

Is it a good idea? Is there any alternative ways to achieve this?

推荐答案

您可以将可序列化的代码作为额外的[1].以HashMap为例，它确实实现了可序列化的接口[2].因此，如果您将变量类型从Map更改为HashMap，则可以直接将地图作为多余的内容.

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] https://docs.oracle.com/javase/7/docs/api/java/util/HashMap.html

[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

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