如何在 Android 中从 Java 图像数据类型中设置 ImageView 资源

Question

I am trying to set a Image View resource from a Image Data Type

Something like

//this line is not working
Image storeImage = new Image(R.drawable.butterfly);

ImageView mainImage = findViewById(R.id.mainImage);

//this line is not working either
mainImage.setImageResource(storeImage);

For my work

I need to store image in a variable then use it later for Image view

Answer 1

Set the drawable directly, to the view:

//store the id of the drawable
int image = R.drawable.butterfly

ImageView mainImage = findViewById(R.id.mainImage);

mainImage.setImageResource(image);

Answer 2

In general, your image is stored, once you added it to your Drawable resource folder. You can access it with an ID which can be stored in a variable (datatype int):

int storeImage = R.drawable.butterfly;

Then you have to make your ImageView accessible as you already did:

ImageView mainImage = findViewById(R.id.mainImage);

Your code mainImage.setImageResource(storeImage); doesn't work because "storeImage" is an int, but the function expects a Drawable. Each time you want to convert the ID into a Drawable, you have to use getDrawable(storeImage); .

Therefore your whole code would look like this:

int storeImage = R.drawable.butterfly;
ImageView mainImage = findViewById(R.id.mainImage);
mainImage.setImageDrawable(getDrawable(storeImage));

Answer 3

mainImage.setImageDrawable(ContextCompat.getDrawable(this, R.drawable.butterfly));