CODEWITHSUNDEEP
androidxmlandroid-layout
jay
jay

Reputation: 109

how to display random xml layouts in android

my app has a bunch of xml layout files. now, i want to add a functionality where a defined number, i.e. 15, of them will be included in an activity. The 15 layouts should be picked randomly every time the activity is started. How do I do that? I was thinking about an array but could not find any good reference about how to include xml files in an array (random).

Upvotes: 1

Views: 748

Answers (2)

njzk2
njzk2

Reputation: 39406

layout references are ints. you can simply choose one using :

int[] layouts = new int[] {R.layout.one, R.layout.two, R.layout.three ...};

setContentView(layouts[new Random().nextInt(layouts.length)]);

Upvotes: 6

AlexS
AlexS

Reputation: 5345

You could override Application.onCreate or in your main Activity.onCreate() and set the resource id of your desired layout in a SharedPreference.

public static final String LAYOUT_ID = "random.layout.id";
private static int[] LAYOUTS = new int[] { R.layout.default, R.layout.fancy };

public void onCreate() {
    SharedPreferences prefs = PreferenceManager.getDefaultSharedPreferences(this);
    prefs.edit().putInt(LAYOUT_ID, getRandomLayoutId()).commit();
}

private int getRandomLayoutId() {
    Random r = new Random(Calendar.getInstance().getTimeInMillis());
    return LAYOUTS[r.nextInt(LAYOUTS.length)];
}

This id can then be used somewhere in your app with setContentView().

private static final int DEFAULT_ID = R.layout.default;

SharedPreferences prefs = PreferenceManager.getDefaultSharedPreferences(this);
setContentView(getInt(MyApplication.LAYOUT_ID, DEFAULT_ID));

If you do it in your main Activity it may apply a new layout even on orientation changes or similar events.

Upvotes: 1

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