如何使用存储在字符串中的值设置意图动作

Question

I want to add a functionality in my App, where a user can make buttons to launch apps on the device. Now, to set this up the user will enter the Intent Action they want to invoke. If user enters "ACTION_MAIN" as a string value, is it possible to process it as Intent.ACTION_MAIN in java ?

I know using a map can be one solution but maintaining an exhaustive list of all available intents can be cumbersome. Is their any other solution to this ? Can string value reference a variable ?

Answer 1

Lets say the user defined action as a string value is stored in userInput :

String userInput = "ACTION_MAIN";

You can get the corresponding value of Intent.<ACTION_SOMETHING> using reflection as follows:

try {
    String action = (String) Intent.class.getDeclaredField(userInput).get(String.class);
    // use the action value here..
} catch (Exception e) {
    // no such action possible, maybe mistyped the action name
    e.printStackTrace();
}

Example :

String action = (String) Intent.class.getDeclaredField("ACTION_MAIN").get(String.class);

returns:

"android.intent.action.MAIN"