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Get the background color of a button in android

Posted by: admin February 23, 2018 Leave a comment

Questions:

How do i get the background color of a button.
In the xml i set the background color using —- android:background = XXXXX
now in the activity class how can i retrieve this value that it has ?

Answers:

Unfortunately I don’t know how to retrieve the actual color.

It’s easy to get this as a Drawable

Button button = (Button) findViewById(R.id.my_button);
Drawable buttonBackground = button.getBackground();

If you know this is a color then you can try

ColorDrawable buttonColor = (ColorDrawable) button.getBackground();

And if you’re on Android 3.0+ you can get out the resource id of the color.

int colorId = buttonColor.getColor();

And compare this to your assigned colors, ie.

if (colorID == R.color.green) {
  log("color is green");
}

Questions:
Answers:
private Bitmap mBitmap;
private Canvas mCanvas;
private Rect mBounds;

public void initIfNeeded() {
  if(mBitmap == null) {
    mBitmap = Bitmap.createBitmap(1,1, Bitmap.Config.ARGB_8888);
    mCanvas = new Canvas(mBitmap);
    mBounds = new Rect();
  }
}

public int getBackgroundColor(View view) {
  // The actual color, not the id.
  int color = Color.BLACK;

  if(view.getBackground() instanceof ColorDrawable) {
    if(Build.VERSION.SDK_INT < Build.VERSION_CODES.HONEYCOMB) {
      initIfNeeded();

      // If the ColorDrawable makes use of its bounds in the draw method,
      // we may not be able to get the color we want. This is not the usual
      // case before Ice Cream Sandwich (4.0.1 r1).
      // Yet, we change the bounds temporarily, just to be sure that we are
      // successful.
      ColorDrawable colorDrawable = (ColorDrawable)view.getBackground();

      mBounds.set(colorDrawable.getBounds()); // Save the original bounds.
      colorDrawable.setBounds(0, 0, 1, 1); // Change the bounds.

      colorDrawable.draw(mCanvas);
      color = mBitmap.getPixel(0, 0);

      colorDrawable.setBounds(mBounds); // Restore the original bounds.
    }
    else {
      color = ((ColorDrawable)view.getBackground()).getColor();
    }
  }

  return color;
}

Questions:
Answers:

You can also try something like set the color value as the tag like

android:tag="#ff0000"

And access it from the code

String colorCode = (String)btn.getTag();

Questions:
Answers:

The simpliest way to get the color for me is:

int color = ((ColorDrawable)button.getBackground()).getColor();

Tested and working on Lollipop 5.1.1

Questions:
Answers:

To get the background Drawable, you use

public Drawable getBackground();

as defined in the base View class.

Don’t forget that the Button can have a background that is an image, a color, a gradient. If you use android:background=”#ffffff”, the class of the background will be

android.graphics.drawable.ColorDrawable

From there you can simply call

public int getColor()

Questions:
Answers:

Try this:

list_view.getChildAt(position).setBackgroundColor(Color.YELLOW);        
ColorDrawable corItem = (ColorDrawable) list_view.getChildAt(position).getBackground();
if(corItem.getColor() == Color.YELLOW){
   Toast.makeText(NovoProcessoActivity.this,"Right Color!", Toast.LENGTH_SHORT).show();
   }else{
   Toast.makeText(NovoProcessoActivity.this,"Wrong Color!", Toast.LENGTH_SHORT).show();
}

or

int color =( (ColorDrawable)  list_view.getChildAt(position).getBackground()).getColor();