My application uses a android.support.v7.widget.ListViewCompat and I'm trying to make the "Overscroll" effect look the same on Pre-lollipop and Lollipop.
On pre-lollipop the Overscroll has the Holo-blue color and on Lollipop and above, it uses the colorPrimary attribute.
Most related answers I find on SO are either very complicated (I think this should be a one-liner, preferable in the App theme) or "borks" the default effect on lollipop and looks wierd.
So can can I write to set the overscroll color to colorPrimary on pre-lollipop devices?
My style.xml (App Theme) file currently contains
<item name="colorPrimary">#color/my_green</item>
<item name="colorPrimaryDark">#color/my_forest</item>
<item name="colorAccent">#color/my_soil</item>
<item name="colorControlNormal">#color/my_green</item>
<item name="colorControlActivated">#color/my_forest</item>
<item name="colorControlHighlight">#color/white</item>
I also find it very strange that the colorControlHighlight color is not used when selecting items in the ListView on pre-lollipop but the default holo-orange color.
Glow is taken from R.drawable.overscroll_edge, so I guess you won't be able to replace it easily. It would be easier to replace the EdgeEffect class with custom drawable. See:
http://grepcode.com/file/repository.grepcode.com/java/ext/com.google.android/android/4.4.4_r1/android/widget/EdgeEffect.java#EdgeEffect
So maybe this is what you're looking for:
Unfortunately this is something really hidden and you won't be able to get that glow without reflection. The above screenshot was taken on Gingerbread, so if you're not afraid of hacks, it's possible. The code is rather long, so I won't paste it here. You can find the implementation in ScrollView and RecyclerView classes of Carbon. There's no ListView (it's now replaced by RecyclerView), but you should be able to get that working as well. It's a copy of Lollipop's glow set as edge effect, so it works and looks like it should.
https://github.com/ZieIony/Carbon/blob/master/carbon/src/main/java/carbon/widget/RecyclerView.java
Related
Anyone can help me?
I'm developing the Light and Dark theme function in the android app, everything goes fine, but the background of Recyclerview shows incorrectly.
The root background of xml file is White color and I didn't set background for recyclerview in xml. However, after changing from Light to Dark or Dark to Right=> background of recyclerview automatically change to a strange color(this color didn't see in my color.xml resource). I tried to set background of Recyclerview to #null or transparent in code and xml file as well but the background of recyclerview didn't remove that strange color.
So anyone knows exactly the reason why, please help me and much appreciated. Thanks
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I am guessing you are using the DayNight Theme. If so you should have to themes.xml folder in res, one is called as mentioned and the other is with the extension (night). There you can define a color in both xml files. It has the same name but different color values like this:
<style name="AppTheme" parent="Theme.AppCompat.DayNight">
<item name="colorPrimaryDark">#ffffff</item> <!-- you normally shouldn't hardcode color -->
</style>
The same for your folder (night):
<style name="AppTheme" parent="Theme.AppCompat.DayNight">
<item name="colorPrimaryDark">#000000</item> <!-- you normally shouldn't hardcode color -->
</style>
The idea is to have one attribute name that contains 2 colors and takes the correct one if needed. For futher understanding I suggest to take a look at this reference to get more familiar with Themes and Styles. Now you set up your Day and Night files properly, you can implement it by using it in your recyclerView as follows:
android:background="?attr/colorPrimaryDark"
Another tip is to make custom colors in multiple colors.xml files to make them for more unique use. In this case colorPrimaryDark effect your whole app. It is also suggested to modify layouts and the visuals of widgets to take effect only on those. (e.x. your recyclerView). In my app I used colorPrimaryDark for all Background (that should be same for more clean design). I think you get the keypoint. Take a look around the net and this forum and you will find your final design strategy. Cheers! :)
My Samsung Galaxy s7 just updated to Android Nougat 7.0 and I noticed some of the buttons are displayed differently. I happen to have another Galaxy s7 around which hasn't gone through the update yet (Marshmallow 6.0.1). I can see the difference in sizes very clearly:
Marshmallow:
Nougat:
The layout_height of that SHARE button is hard set to 44dp. Using Layout Inspector in Android Studio I can read that it resolves to 176px for Marshmallow and 132px for Nougat (same values for mMeasuredHeight). You can also see that the other part of the layout on the left remained the same (ignore the little thumb up icon).
Another example:
Marshmallow:
Nougat:
I'm using following styling for the buttons:
<style name="AppTheme.Button" parent="Widget.AppCompat.Button">
<item name="android:textSize">14sp</item>
<item name="android:textColor">#color/colorPrimaryDark</item>
<item name="android:backgroundTint" tools:targetApi="lollipop">#color/colorTextBrightPrimary</item>
<item name="backgroundTint" >#FFFFFF</item>
<item name="colorButtonNormal">#color/colorTextBrightPrimary</item>
</style>
<style name="AppTheme.Button.Accent" parent="AppTheme.Button">
<item name="android:textColor">#color/colorTextBrightPrimary</item>
<item name="android:backgroundTint" tools:targetApi="lollipop">#color/colorAccent</item>
<item name="backgroundTint" >#color/colorAccent</item>
<item name="colorButtonNormal">#color/colorAccent</item>
</style>
While the SHARE button is a custom view, extending AppCompatButton, the Google and Facebook auth buttons are just AppCompatButtons. In either way, they all looked different just before the update and nothing else was changed in code, nor on the device (text size and zoom are the same).
Any idea what's going on? How to ensure these layouts stay the same on various devices/OS'?
A drawable can have its own padding. In the case of a nine-patch PNG file, that's simply having transparent pixels outside of the actual non-transparent/resizing portion of the image. In the case of ShapeDrawable, you can directly declare padding in the XML. And so on. This may or may not show up as "padding" in tools like the Layout Inspector, as they focus on padding declared on widgets.
Since the previous background you were using had the problem, and the replacement background does not, my guess is that this sort of implicit padding is the problem.
You have two approaches for trying to deal with this:
The risky-but-simple approach is to try using negative padding on the button itself, in a res/values-v24/ variant of your style resources (or, optionally, use a consistent dimension resource in the style and vary the dimension values based on -v25 or not). You would have to tinker a bit to try to get values that "undo" the change. I call this "risky" as I haven't the foggiest notion how well Android respects negative padding.
The aggravating approach is to try to find the actual button background that you were using before, and see what changed about it. The drawables would be declared either in appcompat-v7's themes or the platform's themes, and the actual drawables themselves would then be defined either in appcompat-v7 or in the platform.
I want to create several button styles instyles.xml. I want to support API 19 and higher so I would like to create button styles for both API. What I am doing:
I've created custom style in stylex.xml:
<style name="AppTheme.ButtonGreen" parent="android:Widget.Holo.Button">
<iten name="android:textColor">#color/accent</iten>
<item name="android:background">#color/primary</item>
</style>
In facy the color does not change. Can you help me with theming and give some basic attributes like: background color, text color etc. cause those does not work (only font color works).
I have also implemented style for v21 in styles (v21).xml:
<style name="AppTheme.ButtonGreen" parent="android:Widget.Material.Button">
<item name="android:textColor">#color/primary</item>
<item name="android:background">#color/text_icons</item>
</style>
But here I need font color, background color, elevation, font size etc. (only font color works).
Generally I guess I am doing something wrong. Can you guys help me style those buttons for different API?
Please read this article
https://www.androidcookbook.com/Recipe.seam?recipeId=3307
and this issue on StackOverflow:
How to create custom button in Android using XML Styles
I think the first one would be enough for your actual needs.
If you have question, please feel free to ask.
EDIT: if you still feel stuck - maybe it would be good to create an image and set it as ImageButton.
http://angrytools.com/android/button/
http://dabuttonfactory.com/
Or try to find issues abot using Material Design in lower APIs. This might be helpful: how to use material design features in api lower than 21 in eclipse?
you have to use background instead of backgroundtint
I've searched for a solution, but haven't found one yet.
I'm currently in the process of creating an Android app and my team wants to keep the experience of our app the same across the recent Android versions. We're using the Support v7 library, so most of the Material Design elements can be used in our app, but we're kinda struggling to find a replacement for the tinted status bar. We've got a nice bar on Lollipop, but Kitkat is stuck with the ugly black bar and we'd really like to change that.
We were thinking about a translucent bar for pre-Lollipop devices, but we're not sure on how to approach that. I've tried copying the styles.xml to a new folder, values-v19, and adding
<item name="android:windowTranslucentStatus">true</item>
<item name="android:fitsSystemWindows">true</item>
to the styles, but this is also applied to my phone running Android 5.0.2, strangely enough.
Do you happen to know how to fix this or another method to create a similar effect? I'm new to Android, so detailed explanations will be appreciated.
Try adding
<item name="android:windowTranslucentStatus">false</item>
<item name="android:fitsSystemWindows">false</item>
to either values/styles.xml or values-v21/styles.xml.
When you define a style for a certain API level it will be applied not only to that version, but also to all higher versions, unless explicitly specified otherwise.
I have a ListView with some rows and a custom checkbox on the right hand side. On my OS 4.4 Nexus 4 it seems like a gentle gradient is being applied to the list row backgrounds, creating an ugly artifact on the checkboxes (they disappear half way down, and then invert for the bottom half). On other devices I don't see this problem, and I also don't see it in an OS 4.4.2 emulator.
I haven't been able to find any information online about this, so I'm not sure if it's specific to the device, or the exact OS flavor.
Is this something I can disable? If not, what advice should I give my asset designer?
Here's a screenshot:
The Holo.Light theme uses a subtle grey gradient background. It might only be more apparent on one of your devices due to the screen's contrast/brightness.
You can just set the background to solid white by using the android:windowBackground tag in your Activity's theme:
<style name="SolidWhiteTheme" parent="android:Theme.Holo.Light">
<item name="android:windowBackground">#android:color/white</item>
<item name="android:colorBackground">#android:color/white</item>
</style>
And then applying the theme to your activity in your AndroidManifest.xml like so:
<activity
android:theme="#style/SolidWhiteTheme"
...
>
...
</activity>
As Denley mentioned, the reason for this is the default background specified by the Holo.Light theme.
However, since this background is specifically affecting your ListView, I would suggest setting the background of your ListView in your xml file. Code below.
<ListView
android:background="#android:color/white">
Try specifying a background color for your activity (android:background). If the background is not explicitly set, the device may be using it's own device-specific default background, which is why the gradient is only shown on your Nexus 4 and not other devices.