CODEWITHSUNDEEP
javaandroidarraylist
Björn Ternes
Björn Ternes

Reputation: 1127

Drawable[] from ArrayList with for loop

Is it possible to generate a Drawable[] with a for loop?

ArrayList:

List<String> list = new ArrayList<String>();
list.add(Environment.getExternalStorageDirectory() + "/App/posters/80348-16.jpg");
list.add(Environment.getExternalStorageDirectory() + "/App/posters/83462-8.jpg");

to

   private Drawable[] mThumbIds = {
        Drawable.createFromPath(Environment.getExternalStorageDirectory() + "/Treevo/posters/80348-16.jpg"), Drawable.createFromPath(Environment.getExternalStorageDirectory() + "/Treevo/posters/83462-8.jpg")
};

My idea:

for (int i = 0; i < list.size(); i++)
{

      //But what I need to do here?

}

My goal is to generate the Items for a GridView.

Upvotes: 0

Views: 461

Answers (3)

Zeveso
Zeveso

Reputation: 1294

What you need to do is a for each loop. It goes something like this.

List<String> list = new ArrayList<String>();
String[] imgPathList = ... // Add all of the "/App/poster..." strings here

for(String x : imgPathList) {
  list.add(Enviroment.getExternalStorageDirectory() + x);
}

Here is an example with different things.

List<String> list = new ArrayList<String>();
String[] data = {
    "123",
    "456",
    "789"
};

for(String x : data) {
    list.add("Number: " + x);
}

System.out.println(list.toString());

Prints: "[Number: 123, Number: 456, Number: 789]"

Upvotes: 0

Ted Hopp
Ted Hopp

Reputation: 234795

You can do this:

File dir = Environment.getExternalStorageDirectory();
List<File> list = new ArrayList<File>();
list.add(new File(dir, "App/posters/80348-16.jpg"));
list.add(new File(dir, "App/posters/83462-8.jpg"));

List<Drawable> mThumbs = new ArrayList<Drawable>();
for (File file : list) {
    mThumbs.add(Drawable.createFromPath(file.getPath());
}

If you want to retrieve a list of all .jpg files in the folder, you can construct list like this:

File posterDir = new File(Environment.getExternalStorageDirectory(),
    "App/posters");
List<File> list = new ArrayList<File>();
for (File file : posterDir.listFiles()) {
    if (file.isFile() && file.getName().endsWith(".png")) {
        list.add(file);
    }
}

Upvotes: 2

ssantos
ssantos

Reputation: 16526

No sure what kind of path it expects, but you could try Drawable.createFromPath method. Assuming you store in the first list the right paths, you're loop would look like this.-

Drawable[] drawables = new Drawable[list.size()]();

for (int i = 0; i < list.size(); i++) {
    drawables[i] = Drawable.createFromPath(list.get(i));
}

Upvotes: 1

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