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First, create an InputMultiplexer. Then, set it as the InputProccessor. Add your two InputProcessors to the InputMultiplexer: back button, then stage in this order. If you return false in back button event handlers, then the event gets passed to stage as well.
How to handle the back button in Android?
The getOnBackPressedDispatcher () OnBackPressedDispatcher} will be given chance to handle the back button before the default behavior of android.app.Activity#onBackPressed ()} is invoked. And if you want the same behavior also for the toolbar back button just add this in your activity:
By this way disableDrawer & enableDrawer function handle your Icon and OnBackPressed method handle your BackStack Now in your activity when you press back-icon display if needed. your onBackPressed should be something like this : See full implementation here. Just add two new line of code.
What does activity on backpressed do on Android?
Activity onBackPressed () Back navigation is how users move backward through the history of screens they previously visited. All Android devices provide a Back button for this type of navigation, so you should not add a Back button to your app’s UI.
What do you mean by Input / Output Processor?
Input/output processor. The input/output processor or I/O processor is a processor that is separate from the main processor or CPU and is designed to handle only input/output processes for a device or the computer. The I/O processor is capable of performing actions without interruption or intervention from the CPU.
What happens when input method appears on screen?
When the input method appears on the screen, it reduces the amount of space available for your app’s UI. The system makes a decision as to how it should adjust the visible portion of your UI, but it might not get it right.
How does input work on an Android phone?
When input focus moves into or out of an editable text field, Android shows or hides the input method (such as the on-screen keyboard) as appropriate. The system also makes decisions about how your UI and the text field appear above the input method.