Common mistakes when working with Handler?

Learn about common pitfalls when working with Android's Handler. Avoid these mistakes to improve your app's performance and reliability.

Android, Handler, common mistakes, Android development, performance, reliability

<![CDATA[ // Common mistakes when working with Handler Handler mHandler = new Handler(Looper.getMainLooper()); // Make sure to use the correct Looper // 1. Not removing callbacks mHandler.postDelayed(new Runnable() { @Override public void run() { // Task to perform } }, 1000); // Later, if you don't remove this callback, it may cause memory leaks // mHandler.removeCallbacksAndMessages(null); // Call this when done // 2. Using outdated references // Avoid using references of Activities in Handlers directly to prevent leaks final Activity activity = this; // Should avoid if referenced in a long task mHandler.post(new Runnable() { @Override public void run() { // access UI components of activity activity.findViewById(R.id.someView).setVisibility(View.VISIBLE); } }); // 3. Long-running tasks on UI thread mHandler.post(new Runnable() { @Override public void run() { // Avoid doing heavy work here, it can freeze the UI // Instead, use AsyncTask or other threading solutions } }); ]]>

Android Handler common mistakes Android development performance reliability

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