Add gradient to preview images in toolbar

[AndyScherzinger]

Resolves #2883

Light (before)	Light (after)

Dark(before)	Dark(after)

[nextcloud-android-bot]

APK file: https://www.kaminsky.me/nc-dev/android-artifacts/13054.apk



To test this change/fix you can simply download above APK file and install and test it in parallel to your existing Nextcloud app.

[nextcloud-android-bot]

Codacy

705

Lint

Type	master	PR
Warnings	96	96
Errors	0	0

SpotBugs (new)

Warning Type	Number
Bad practice Warnings	26
Correctness Warnings	70
Internationalization Warnings	13
Malicious code vulnerability Warnings	5
Multithreaded correctness Warnings	9
Performance Warnings	77
Security Warnings	44
Dodgy code Warnings	141
Total	385

SpotBugs (master)

Warning Type	Number
Bad practice Warnings	26
Correctness Warnings	70
Internationalization Warnings	13
Malicious code vulnerability Warnings	5
Multithreaded correctness Warnings	9
Performance Warnings	77
Security Warnings	44
Dodgy code Warnings	141
Total	385

[codecov]

Codecov Report

Merging #5634 into master will decrease coverage by 0.06%.
The diff coverage is 59.45%.

@@             Coverage Diff              @@
##             master    #5634      +/-   ##
============================================
- Coverage     24.86%   24.80%   -0.07%     
  Complexity        3        3              
============================================
  Files           401      401              
  Lines         34003    34009       +6     
  Branches       4727     4728       +1     
============================================
- Hits           8456     8437      -19     
- Misses        24261    24279      +18     
- Partials       1286     1293       +7     

Impacted Files	Coverage Δ	Complexity Δ
...android/files/CreateFileFromTemplateOperation.java	0.00% <0.00%> (ø)	0.00 <0.00> (ø)
...ncloud/android/files/StreamMediaFileOperation.java	0.00% <0.00%> (ø)	0.00 <0.00> (ø)
...ava/com/owncloud/android/jobs/NotificationJob.java	0.00% <0.00%> (ø)	0.00 <0.00> (ø)
.../operations/RichDocumentsCreateAssetOperation.java	0.00% <0.00%> (ø)	0.00 <0.00> (ø)
.../android/operations/RichDocumentsUrlOperation.java	0.00% <0.00%> (ø)	0.00 <0.00> (ø)
.../android/ui/activity/ConflictsResolveActivity.java	31.81% <ø> (ø)	0.00 <0.00> (ø)
...com/owncloud/android/ui/activity/FileActivity.java	29.81% <ø> (ø)	0.00 <0.00> (ø)
...cloud/android/ui/activity/FileDisplayActivity.java	25.67% <ø> (ø)	0.00 <0.00> (ø)
...roid/ui/activity/ReceiveExternalFilesActivity.java	0.00% <ø> (ø)	0.00 <0.00> (ø)
...cloud/android/ui/activity/UploadFilesActivity.java	0.00% <ø> (ø)	0.00 <0.00> (ø)
... and 26 more

[jancborchardt]

Good stuff, much better! :)

Probably something for a separate pull request, but is it also possible to show the fade & image below the status bar, with the status bar being transparent? From the screenshot of yours at #2485 (comment) it does seem possible, and now with the fade would also look very nice. :)

[AndyScherzinger]

Probably something for a separate pull request, but is it also possible to show the fade & image below the status bar, with the status bar being transparent? From the screenshot of yours at #2485 (comment) it does seem possible, and now with the fade would also look very nice. :)

@jancborchardt yes, I guess and like you said we should then open a new issue for that The transparent system bar won't work for older Android versions but that is fine imho.

[AndyScherzinger]

/backport to stable-3.11

[backportbot-nextcloud]

backport to stable-3.11 in #5643