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Android

Posted by gramjoirps
gramjoirps
2,048 Points

Change Image Dynamically in Android

Hello Everyone,

I can set an image dynamically in Android but

how about having 6 images and every time I click on the button it should change the image in imageview.

I know how to do it with random class that's something I learned here but how about changing images in order.

I hope somebody helps me out.

3 Answers

Blake Gall
Blake Gall
2,517 Points

The way I'm thinking this would work is by using setImageResource() method and also every time you click the button, it'll add 1 to a counter. once the counter reaches 5, it will reset. <br> Outside of Main() : <br>

public int counter = 0;

<br> Inside of OnClick: <br>

OnClick(View v){
    if(counter == 0){
        imageView.setImageResource(R.drawable.image1);
    }
    if(counter == 1){
        imageView.setImageResource(R.drawable.image2);
    }
    if(counter == 2){
        imageView.setImageResource(R.drawable.image3);
    }
    if(counter == 3){
        imageView.setImageResource(R.drawable.image4);
    }
    if(counter == 4){
        imageView.setImageResource(R.drawable.image5);
    }
    if(counter == 5){
        imageView.setImageResource(R.drawable.image6);
        counter = -1;
    }
    counter++
}

<br> I tried something close to this for a crystal ball prank app but it didn't work the way I thought. Please tell me if this works for you.

Edit: you might want to use an else statement after that last if statement but do not put the counter++ in that else statement

gramjoirps
gramjoirps
2,048 Points

Thank you for replying but it crashes the app and doesn't work.

Blake Gall
Blake Gall
2,517 Points

Thats the only way I could think of it. If there are other answers I knew I would have used them

gramjoirps
gramjoirps
2,048 Points

Hey man, thanks it worked.

Just wondering what do you mean by last one counter = -1;

It worked without that.

Blake Gall
Blake Gall
2,517 Points

Since that counter++ would run anyways, i wanted to set the integer to -1 so when the counter++ ran, counter would reset to 0

Steve Hunter
Steve Hunter
57,712 Points
Steve Hunter
Steve Hunter
57,712 Points

Hi,

That looks OK - would a switch/case be less wordy? You might also consider calling a separate function inside onClick so that the code is kept in its own place.

It'd be great to use an array of images so you could just use the index, R.drawable.imageArray[counter]. That'd be far less code! But I don't know if that's doable.

gramjoirps
gramjoirps
2,048 Points

Can you please show the array way step by step please?

Steve Hunter
Steve Hunter
57,712 Points
Steve Hunter
Steve Hunter
57,712 Points

I don't think the array would work - let me try it first! I need to create a project to start with - I've just rebuilt the Mac so all my previous projects have gone.

gramjoirps
gramjoirps
2,048 Points

Your help will be much appreciated.