Dynamically get drawables by ID

The name of the pictureThe name of the pictureThe name of the pictureClash Royale CLAN TAG#URR8PPP



Dynamically get drawables by ID



I want to take a byte and append it to a resource ID to be able to get the image that corresponds to that numbered deck in the game. It was easy to with paths on other devices, but with the Resource ID's I am unsure how I could go about do this.


byte



Here's what I have now:


switch(GameSettings.gameDeck)

case 1:
deckImage.setBackgroundResource(R.drawable.deck1);
break;
case 2:
deckImage.setBackgroundResource(R.drawable.deck2);
break;
case 3:
deckImage.setBackgroundResource(R.drawable.deck3);
break;
case 4:
deckImage.setBackgroundResource(R.drawable.deck4);
break;



In my Blackberry version of this, I simply had:


deckImage.setBitmap(Bitmap.getBitmapResource("/path/deck" + GameSettings.gameDeck + ".png"));



Is there a way to accomplish something similar using Resource IDs on Android?




1 Answer
1



Use getResources().getIdentifier() from your Context (e.g., Activity), but please cache the result if you will use it more than once. getIdentifier() is implemented on Resources.


getResources().getIdentifier()


Context


Activity


getIdentifier()


Resources



For example:


int drawableId=getResources().getIdentifier("foo"+index, "drawable", getPackageName());



would return the value of R.drawable.fooN, where N is the number given by index.


R.drawable.fooN


N


index



For more, see this and this and this.





Awesome, that works perfectly. Thanks!
– Matt Swanson
Mar 10 '10 at 3:11





To improve on this answer: Bitmap myImage = BitmapFactory.decodeResource(getResources(), R.drawable.myImageName);
– RockMeetHardplace
Dec 3 '11 at 17:23





How would you recommend caching, LruCache?
– theblang
Jul 2 '14 at 16:06





@mattblang: IDs are only ints, and you shouldn't have millions of IDs. Hence, plain data members (or even local variables outside of loops) should suffice in most cases.
– CommonsWare
Jul 2 '14 at 16:18





@CommonsWare Sorry, I meant the drawables.
– theblang
Jul 2 '14 at 16:19






By clicking "Post Your Answer", you acknowledge that you have read our updated terms of service, privacy policy and cookie policy, and that your continued use of the website is subject to these policies.

-

Popular posts from this blog

Firebase Auth - with Email and Password - Check user already registered

Image
Clash Royale CLAN TAG #URR8PPP Firebase Auth - with Email and Password - Check user already registered I want to check when a user attempts to signup with createUserWithEmailAndPassword() in Firebase user Authentication method, this user is already registered with my app. createUserWithEmailAndPassword() 8 Answers 8 To detect whether a user with that email address already exists, you can detect when the call to createUserWithEmailAndPassword () fails with auth/email-already-in-use . I see that @Srinivasan just posted an answer for this. createUserWithEmailAndPassword () auth/email-already-in-use Alternatively, you can detect that an email address is already used by calling fetchSignInMethodsForEmail() (previous called fetchProvidersForEmail() ). fetchSignInMethodsForEmail() fetchProvidersForEmail() When the user trying to create an user with same email address, the task response will be "Response: The email address is already in use by another account." mFirebas...
Read more

Dynamically update html content plain JS

Image
Clash Royale CLAN TAG #URR8PPP Dynamically update html content plain JS So I have a script bound in my index.html, which literally has to fetch an array of jsons from an api, then dynamically update my page when get response. But as a result I'm getting an as the only update of my page. here is my script fetch(url) .then((resp) => resp.json()) .then((resp) => resp.results.forEach(item => fetch(item.url) .then((response)=> response.json()) .then((response) => pokeArr.push(response)) .catch(console.log) ) ).catch(console.log) const filler = () => if(!pokeArr) return 0 pokeArr.map((i,j)=> return `<tr>$i.name</tr>` ) const pokeindex = () => document.getElementById('a').appendChild(document.createElement(filler())) pokeindex() When I'm consoling it, I can see in the console all the responses I get, so I'm at least doing the fetching part right. What's parberakan ? What's pokeArr ? – T.J. Crowder Aug 8 at 12...
Read more

Creating a leaderboard in HTML/JS

Image
Clash Royale CLAN TAG #URR8PPP Creating a leaderboard in HTML/JS I'm trying to create a top 10 leaderboard, for now, I've only implemented 3 players, but I'm coming across an issue. My script doesn't seem to be outputting anything on webpage. The purpose of the script is to compare 3 arrays, player1,player2,and player3 solely based off of score. Which is the 2nd index of each array. I want the script to list the players in order of highest score. This method doesn't really seem to be efficient, especially when I'll have to add 7 more players. Could someone suggest perhaps an easier approach, as well as show me why my script wont output the info. Here's the JS function leaderboard() { var player1 = name:"Thomas",date:"01/23/18",score:"201"; var player2 = name:"Michael",date:"03/24/17",score:"943"; var player3 = Name:"Lisa",date:"06/04/18",Score:"79"; if(player1[2]...
Read more