Dynamically choosing drawable

Question

I want the user to select a wallpaper and I'll set it as the android wallpaper. I'm currently using this line:

myWallpaperManager.setResource(R.drawable.a1);

Problem is it's not dynamic and I want to change the chosen image to R.drawable.a2,R.drawable.a3,R.drawable.a4, etc based on the number I got. So if I have int chosenPicNum=3 I want to create the string "R.drawable.a"+3 and then call myWallpaperManager.setResource(R.drawable.a3);

But I can't do it. The error is eclipse reads it as a string and not a resource. Currently here's the closest I've gotten:

String imageResource="R.drawable.a"+chosenPicNum) ;

So imageResource in this case is String type "R.drawable.a3" but I want it to be R.drawable.a3.

Thank you for your help!!

Dvir, ambitious 20 year old :)

0101100101 · Accepted Answer · 2014-07-30T11:29:08.343

2

Use getIdentifier() like this:

public final static String PACKAGE = "..."; // insert your package name

private int getDrawable(String name) {
    return getId(name, "drawable");
}

private int getId(String name, String type) {
    return getResources().getIdentifier(name, type, PACKAGE);
}

Access the method using:

myWallpaperManager.setResource(getDrawable("a" + chosenPicNum));

edited Jul 30 '14 at 11:29

answered Jul 30 '14 at 10:50

0101100101

5,786
6
31
55

mmm it always returns 0. Here's what my print statemants gave me: value of string a is R.drawable.a2 value of R.drawable.a1 is 2130837504 value of getDrawable(a) is 0 – david Jul 30 '14 at 11:13
Fixed. Not supposed to pass R.drawable (getIdentifier does that). – 0101100101 Jul 30 '14 at 11:29

score 0 · Answer 2 · answered Jul 30 '14 at 10:48

0

As you use resources, you already know their number and names. So use an array:

int[] ids = new int[] {R.drawable.a1, R.drawable.a2, R.drawable.a3, };

And when you have your chosenNumPic (assuming it's 0 based):

if (chosenNumPic >= 0 && chosenNumPic < ids.length) {
    myWallpaperManager.setResource(ids[chosenNumPic]);
}

Hope it helps :)

answered Jul 30 '14 at 10:48

Margarita Litkevych

2,086
20
28

He asked for a dynamic solution. This is static. – 0101100101 Jul 30 '14 at 10:54

score 0 · Answer 3 · answered Jul 30 '14 at 10:58

0

try this

int resId = getResources().getIdentifier("your_drawable_name"), "drawable", getActivity().getPackageName());
imageview.setBackgroundResource(resId);

answered Jul 30 '14 at 10:58

Sam

4,046
8
31
47

Dynamically choosing drawable

3 Answers3