Android button color change

Question

I have a simple button in my application.
I want to do the following:
when the application starts, the color of the button changes continuously (for example, every 3 seconds) without any touch or focus in order to catch the eyes of customers by clicking on it.
is there any way to do this?

Answer 1

Use the code below:

Handler handler = new Handler();
Runnable runnable = new Runnable() {
  @Override 
  public void run() 
  {
     int rnd = (int)(Math.random() * 4);
     if(rnd==0)
        btn.setBackgroundColor(Color.BLUE);
     if(rnd==1)
        btn.setBackgroundColor(Color.RED);
     if(rnd==2)
        btn.setBackgroundColor(Color.GREEN);
     if(rnd==3)
        btn.setBackgroundColor(Color.YELLOW);

     btn.invalidate();
     handler.postDelayed(runnable, 3000);
   }
};
handler.postDelayed(runnable, 3000);

Answer 2

To repeat the flowers -

Button btn = (Button) findViewById(R.id.btn);
Handler handler = new Handler();

final Runnable r = new Runnable() {
public void run() {
    int i = 0;
    if (i == 0) {
    btn.setBackgroundColor(Color.YELLOW);
    i++;
    } else if (i == 1) {
    btn.setBackgroundColor(Color.RED);
    i++;
    } else if (i == 2) {
    btn.setBackgroundColor(Color.BLUE);
    i++;
    } else if (i == 3) {
    btn.setBackgroundColor(Color.GREEN);
    i = 0;
    }
    handler.postDelayed(this, 3000); // Set time in milliseconds
}
};

handler.postDelayed(r, 3000); // Set time in milliseconds

This code changes the color of the button every 3 seconds in this order - yellow, red, blue, green.

For RANDOM colors -

Button btn = (Button) findViewById(R.id.btn);
Handler handler = new Handler();

final Runnable r = new Runnable() {
public void run() {
    int i = (int) Math.random() * 3;
    if (i == 0) {
    btn.setBackgroundColor(Color.YELLOW);
    } else if (i == 1) {
    btn.setBackgroundColor(Color.RED);
    } else if (i == 2) {
    btn.setBackgroundColor(Color.BLUE);
    } else if (i == 3) {
    btn.setBackgroundColor(Color.GREEN);
    }
    handler.postDelayed(this, 3000); // Set time in milliseconds
}
};

handler.postDelayed(r, 3000); // Set time in milliseconds

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Answer 3

XML

 <?xml version="1.0" encoding="utf-8"?>
<animation-list xmlns:android="http://schemas.android.com/apk/res/android"
android:oneshot="true">
<item android:drawable="@drawable/frame1" android:duration="50" />
<item android:drawable="@drawable/frame2" android:duration="50" />
<item android:drawable="@drawable/frame3" android:duration="50" />
etc...
</animation-list>

imageView.setBackgroundResource(R.drawable.movie);
AnimationDrawable anim = (AnimationDrawable)   
imageView.getBackground();
anim.start();