How to flashes LinearLayout?

Question

i have button bar inside LinearLayout.

I want to warn the user by LinearLayout flashes some times.(like winking)

How do I do it?

Thank you in advance for your help.

score 0 · Answer 1 · answered Mar 14 '16 at 16:59

0

you can do it by using a Thread with a sleep of whatever time you want and changing the background color of your linearLayout in it

answered Mar 14 '16 at 16:59

1shubhamjoshi1

546
7
16

I don't see why thread sleep is necessary. It will block the whole UI. But yes, the way is a background change... – Galya Mar 14 '16 at 17:00

score 0 · Answer 2 · edited May 23 '17 at 11:45

0

LinearLayout is a View. That means you can use an animation to update the background of that view.

Here is an example: Animate change of view background color on Android

edited May 23 '17 at 11:45

Community

1
1

answered Mar 14 '16 at 17:11

Gennadii Saprykin

4,505
8
31
41

score 0 · Answer 3 · answered Mar 14 '16 at 17:20

Just for fun...here is a tested sample using handler.postDelayed, flash for 5 seconds

    protected int seconds = 5;
    private LinearLayout llTest;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_flash);
        llTest= (LinearLayout ) findViewById(R.id.llTest);
        handler.removeCallbacks(runnable);
        handler.postDelayed(runnable, 1000);

    }

    private Runnable runnable = new Runnable() {
        public void run() {
            long currentMilliseconds = System.currentTimeMillis();
            seconds--;
            if (seconds > 0) {
                llTest.setBackgroundColor( seconds % 2 == 0 ? Color.RED : Color.BLUE );
                handler.postAtTime(this, currentMilliseconds);
                handler.postDelayed(runnable, 1000);
            } else {
                handler.removeCallbacks(runnable);                    
            }
        }
    };

Hope it helps!!

score 0 · Accepted Answer · answered Mar 17 '16 at 16:15

I solve that by this method:

public void tintBackground(final View rootView, final boolean changeColor) {
    G.HANDLER.post(new Runnable() {

        @Override
        public void run() {
            int sdk = android.os.Build.VERSION.SDK_INT;
            if (changeColor) {
                ColorDrawable[] color = { new ColorDrawable(Color.RED),
                        new ColorDrawable(getResources().getColor(R.color.theme_color)) };
                TransitionDrawable trans = new TransitionDrawable(color);
                if (sdk < android.os.Build.VERSION_CODES.JELLY_BEAN) {
                    rootView.setBackgroundDrawable(trans);
                } else {
                    rootView.setBackground(trans);
                }
                trans.startTransition(1000); // do transition over 1 seconds
            } else {
                if (sdk < android.os.Build.VERSION_CODES.JELLY_BEAN) {
                    rootView.setBackgroundDrawable(null);
                } else {
                    rootView.setBackground(null);
                }
            }
        }
    });
}

How to flashes LinearLayout?

4 Answers4