Skip to main content

What is the difference between var and val and val const ?

-> Var are mutable and assigned with the values multiple times 

-> Val is read-only and not purely immutable, val can be initialized at runtime/runtime constants 

-> const will be assigned to immutable property of the class, only with the primitive datatypes and the string, not objects, const will be initialized at the compile time/compile time constants 

-> val const - immutable + compile time  


Labels:

Comments

Post a Comment

Popular posts from this blog

Launch an Android application on Bootup

If you want to start an android application on device restarts, you need to listen for BOOT_COMPLETED broadcast in the manifest file and launch the Launcher activity in onreceive of BOOT_COMPLETED broadcast receiver. Follow below steps to launch activity on device boot up :- 1. Register for Boot completed receiver in Android Manifest file. Add below Permission to receive BOOT_COMPLETED broadcast, <uses-permission android:name="android.permission.RECEIVE_BOOT_COMPLETED" /> Register for Boot completed broadcast receiver , <receiver android:name="AppAutostartReceiver" android:enabled="true" > <intent-filter> <action android:name="android.intent.action.BOOT_COMPLETED" /> </intent-filter> </receiver> 2. Add custom Broadcast receiver in the application, public class AppAutostartReceiver extends BroadcastReceiver { @Override public void onReceive(Context cont...
Post a Comment
Read more

Whitelist an android application on android 6.0/Marshmallow

Whitelist wont disable doze mode for your app, however can use network and hold wake lock. Whitelist an android application through code, boolean isIgnoringBatteryOptimizations = pm.isIgnoringBatteryOptimizations(getPackageName()); if(!isIgnoringBatteryOptimizations){   Intent intent = new Intent();   intent.setAction(Settings.ACTION_REQUEST_IGNORE_BATTERY_OPTIMIZATIONS);   intent.setData(Uri.parse("package:" + getPackageName()));   startActivityForResult(intent, MY_IGNORE_OPTIMIZATION_REQUEST);   }                             Check for the result, @Override protected void onActivityResult(int requestCode, int resultCode, Intent data) {     if (requestCode == MY_IGNORE_OPTIMIZATION_REQUEST) {          PowerManager pm = (PowerManager)getSystemService(Context.POWER_SERVICE);          boolean isIgnoringBatteryOptimiza...
Post a Comment
Read more