[Android] Resize contents on VncCanvasActivity when soft keyboard is visible.

[gujjwal00]

Related Issue: #76

I am assuming that we don't want to remove fullscreen mode. However, if we can afford non-fullscreen mode OR immersive (sticky) mode, we might be able to implement a better solution.

Also, given that this is more of a hack, it would be better to get some user experience.

[bk138]

Me thinks we are using immersive (sticky) mode:

multivnc/android/app/src/main/java/com/coboltforge/dontmind/multivnc/VncCanvasActivity.java

Line 1249 in 4a3b3ad

private void hideSystemUI() {

. IIRC, 018c099 was added because I was testing with tablets and the former experience wasn't so nice.

[bk138]

Some thoughts:

• I like this PR, it definitely is an improvement over the former behaviour.
• Maybe the screen should also get scaled when the keyboard pops up? But then, how much? To make up for the space taken by the keyboard - can we get that? To fit the screen?
• This needs testing on tablets. I added 018c099 because tablet experience was suboptimal, let's compare the different approaches on tablets.

[gujjwal00]

Me thinks we are using immersive (sticky) mode:

Yes, but we are also setting these flags:

multivnc/android/app/src/main/java/com/coboltforge/dontmind/multivnc/VncCanvasActivity.java

Lines 561 to 563 in 408e2be

	// hide title bar, status bar
	getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN,
	WindowManager.LayoutParams.FLAG_FULLSCREEN);

These seems to enable more strict fullscreen mode. So far I have found three modes:

1. Truly fullscreen:

   • Currently in use
   • Specified by LayoutParams.FLAG_FULLSCREEN on window
   • Android ignore any request to auto resize (by adjustResize)
   • We don't get any information about keyboard visibility. (have to watch layout events)

2. Immersive/Immersive_Sticky

   • Enabled by View.SYSTEM_UI_FLAG_*
   • 'Looks' same as fullscreen
   • It gets disabled if FabMenu is shown or Dialog pops up.
   • adjustResize is still ignored
   • We get 'window insets' when keyboard is visible so we can use that

3. Non-fullscreen mode

   • adjustResize works

This needs testing on tablets. I added 018c099 because tablet experience was suboptimal, let's compare the different approaches on tablets.

Yeah, there seems to be a lot of edge cases around fullscreen+resize in Android.

[bk138]

I'll have a tablet at hand soon to test this.