Get associated image (Drawable) in ImageView android

问题

i set a image to a imageview control in android:

iv.setImageResource(R.drawable.image1);

i want to get this associated Drawable, looks like:

Drawable myDrawable = iv.getImageResource(); //wrong

thanks!

回答1:

You can get the drawable like

Drawable myDrawable = iv.getDrawable();

You can compare it with a drawable resource like

if(iv.getDrawable()==getResources().getDrawable(R.drawable.image1)){
    //do work here
}

回答2:

Define the Drawable first.

Drawable myDrawable = getResources().getDrawable(R.drawable.image1);
iv.setImageDrawable(myDrawable);

回答3:

Unfortunately, there is no getImageResource() or getDrawableId(). But, I created a simple workaround by using the ImageView tags.

In onCreate():

imageView0 = (ImageView) findViewById(R.id.imageView0);
imageView1 = (ImageView) findViewById(R.id.imageView1);
imageView2 = (ImageView) findViewById(R.id.imageView2);

imageView0.setTag(R.drawable.apple);
imageView1.setTag(R.drawable.banana);
imageView2.setTag(R.drawable.cereal);

Then, if you like, you can create a simple function to get the drawable id:

private int getImageResource(ImageView iv) {
    return (Integer) iv.getTag();
}

I hope this helps you, it sure made my work easier.

回答4:

use Drawable drawable=imageview.getDrawable();

回答5:

You can compare drawable resources like

     if (imageView.getDrawable().getConstantState() == 
        ContextCompat.getDrawable(getContext(), R.drawable.image1).getConstantState()) {
}

BitmapDrawables created from the same resource will for instance share a unique -bitmap stored in their ConstantState https://developer.android.com/reference/android/graphics/drawable/Drawable.ConstantState

getResources.getDrawable is deprecated so you can use ContextCompat.getDrawable inplace of it.

回答6:

This is an easy approach if you can use the view's id member variable: just store the R.drawable id using v.setId(). Then get it back with v.getId().

来源：https://stackoverflow.com/questions/7266836/get-associated-image-drawable-in-imageview-android

标签

android

imageview