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    <p>One solution to this problem is to use the <a href="http://developer.android.com/reference/android/os/Handler.html" rel="noreferrer">Handler.postDelayed()</a> method. Some Google <a href="https://cswithandroid.withgoogle.com/lesson-plans/facilitator-guide.html" rel="noreferrer">training materials</a> suggest the same solution.</p> <pre><code>@Override public void onClick(View v) { my_button.setBackgroundResource(R.drawable.icon); Handler handler = new Handler(); handler.postDelayed(new Runnable() { @Override public void run() { my_button.setBackgroundResource(R.drawable.defaultcard); } }, 2000); } </code></pre> <p>However, some have pointed out that the solution above <a href="http://www.androiddesignpatterns.com/2013/01/inner-class-handler-memory-leak.html" rel="noreferrer">causes a memory leak</a> because it uses a non-static inner and anonymous class which implicitly holds a reference to its outer class, the activity. This is a problem when the activity context is garbage collected. </p> <p>A more complex solution that avoids the memory leak subclasses the <code>Handler</code> and <code>Runnable</code> with static inner classes inside the activity since static inner classes do not hold an implicit reference to their outer class:</p> <pre><code>private static class MyHandler extends Handler {} private final MyHandler mHandler = new MyHandler(); public static class MyRunnable implements Runnable { private final WeakReference&lt;Activity&gt; mActivity; public MyRunnable(Activity activity) { mActivity = new WeakReference&lt;&gt;(activity); } @Override public void run() { Activity activity = mActivity.get(); if (activity != null) { Button btn = (Button) activity.findViewById(R.id.button); btn.setBackgroundResource(R.drawable.defaultcard); } } } private MyRunnable mRunnable = new MyRunnable(this); public void onClick(View view) { my_button.setBackgroundResource(R.drawable.icon); // Execute the Runnable in 2 seconds mHandler.postDelayed(mRunnable, 2000); } </code></pre> <p>Note that the <code>Runnable</code> uses a <a href="https://developer.android.com/reference/java/lang/ref/WeakReference.html" rel="noreferrer">WeakReference</a> to the Activity, which is necessary in a static class that needs access to the UI.</p>
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    1. COIt works, but that's a pretty inconvenient way to introduce delays throughout code, right?
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      1. USEhtesh Choudhury
    2. COI'm not sure what you mean by "inconvenient". The Handler's postDelayed method is designed to tell Android that you want a bit of code to be executed after a certain amount of time has passed.
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    3. COafter 2 years and this code just helped me! thanks @tronman!! :)
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      1. USMelvin Lai
 

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