Develop Reference

AppCompat v21 PopupMenu style

I'm implementing a custom PopupMenu in my app and faced a difficulty styling it.
PopupMenu is created as:
public DropDownMenu(Context context, Button button, int menuId,
OnMenuItemClickListener listener) {
mButton = button;
mPopupMenu = new PopupMenu(context, mButton);
mMenu = mPopupMenu.getMenu();
mPopupMenu.getMenuInflater().inflate(menuId, mMenu);
mPopupMenu.setOnMenuItemClickListener(listener);
mButton.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
mPopupMenu.show();
}
});
}
public DropDownMenu addDropDownMenu(Button button, int menuId) {
DropDownMenu menu = new DropDownMenu(mContext, button, menuId, this);
mMenus.add(menu);
return menu;
}
in styles.xml I set:
<style name="AppTheme" parent="Theme.AppCompat.Light.NoActionBar">
<item name="popupMenuStyle">#style/PopupMenu</item>
<item name="textAppearanceLargePopupMenu">#style/PopupMenu.MenuItemText.Large</item>
<item name="textAppearanceSmallPopupMenu">#style/PopupMenu.MenuItemText.Small</item>
</style>
<style name="PopupMenu" parent="Widget.AppCompat.PopupMenu">
<item name="android:popupBackground">#color/anybill_blue</item>
</style>
I tried applying various styles and attributes, but no matter what I do I always see this:
How to get rid of those ridiculous incorrect layout padding? I guess it's all about I'm missing some important style attribute.
Not sure if it matters, but style worked fine when I used it without AppCompat lib in API 19 code.
UPDATE: if I use android.support.v7.widget.PopupMenu, then style is as above. If I use android.widget.PopupMenu, then no styles applied at all - it's always white background and black text, but displayed correctly

You can try to add this to your popupstyle:
<item name="android:popupElevation">0dp</item>

How to add a scrollview edge color effect in Android Lollipop?

In my app I change the overscroll glow effect color like this:
int glowDrawableId = contexto.getResources().getIdentifier("overscroll_glow", "drawable", "android");
Drawable androidGlow = contexto.getResources().getDrawable(glowDrawableId);
assert androidGlow != null;
androidGlow.setColorFilter(getResources().getColor(R.color.MyColor), PorterDuff.Mode.SRC_ATOP);
But when i updated to lollipop this code crashes. I get following error code:
FATAL EXCEPTION: main
Process: com.myproject.myapp, PID: 954
android.content.res.Resources$NotFoundException: Resource ID #0x0
at android.content.res.Resources.getValue(Resources.java:1233)
at android.content.res.Resources.getDrawable(Resources.java:756)
at android.content.res.Resources.getDrawable(Resources.java:724)
Seems that overscroll_glow resource is missing in lollipop.
How can I achieve this?

You can specify android:colorEdgeEffect in your theme to change the overscroll glow color within your entire app. By default, this inherits the primary color value set by android:colorPrimary.
res/values/themes.xml:
<style name="MyAppTheme" parent="...">
...
<item name="android:colorEdgeEffect">#color/my_color</item>
</style>
Alternatively, you can modify this value for a single view using an inline theme overlay.
res/values/themes.xml:
<!-- Note that there is no parent style or additional attributes specified. -->
<style name="MyEdgeOverlayTheme">
<item name="android:colorEdgeEffect">#color/my_color</item>
</style>
res/layout/my_layout.xml:
<ListView
...
android:theme="#style/MyEdgeOverlayTheme" />

The "android:colorEdgeEffect" solution works perfectly, and is much better than the previous hacks. However, it cannot be used if the edge color needs to be changed prorgrammatically.
It is possible, though, to use reflection to do so, setting the EdgeEffect objects directly in the AbsListView or ScrollView instances. For example:
EdgeEffect edgeEffectTop = new EdgeEffect(this);
edgeEffectTop.setColor(Color.RED);
EdgeEffect edgeEffectBottom = new EdgeEffect(this);
edgeEffectBottom.setColor(Color.RED);
try {
Field f1 = AbsListView.class.getDeclaredField("mEdgeGlowTop");
f1.setAccessible(true);
f1.set(listView, edgeEffectTop);
Field f2 = AbsListView.class.getDeclaredField("mEdgeGlowBottom");
f2.setAccessible(true);
f2.set(listView, edgeEffectBottom);
} catch (Exception e) {
e.printStackTrace();
}
EdgeEffect.setColor() was added in Lollipop.
Same caveats as any reflection-based solution, though.

In lollipop the overscroll effect color can be customized with the item style colorPrimary :
<style name="MyApp" parent="Theme.AppCompat.Light">
<item name="colorPrimary">#color/mycolor</item>
</style>
This item also affect the color of the toolbar.

I'm using this to change the edge color programmatically on android L. This works for both listView and scrollView, and views extend them.
#TargetApi(Build.VERSION_CODES.LOLLIPOP)
private static void setEdgeEffectL(View scrollableView, int color) {
final String[] edgeGlows = {"mEdgeGlowTop", "mEdgeGlowBottom", "mEdgeGlowLeft", "mEdgeGlowRight"};
for (String edgeGlow : edgeGlows) {
Class<?> clazz = scrollableView.getClass();
while (clazz != null) {
try {
final Field edgeGlowField = clazz.getDeclaredField(edgeGlow);
edgeGlowField.setAccessible(true);
final EdgeEffect edgeEffect = (EdgeEffect) edgeGlowField.get(scrollableView);
edgeEffect.setColor(color);
break;
} catch (Exception e) {
clazz = clazz.getSuperclass();
}
}
}
}

overscroll_glow.png doesn't exist in platform 21. You can copy the resourses from platform 20 and use them.
You can find overscroll_glow.png in:
{SDK_FOLDER}\platforms\android-20\data\res
This way you don't use reflection that can, as you can see, mess with your program after some updates.

i know i am too late, but this works for me for my app api >=17:
<style name="ListTheme" parent="Theme.AppCompat.Light.DarkActionBar">
<item name="colorPrimary">#color/colorPrimaryDark</item>
</style>
<ListView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:theme="#style/ListTheme"/>

MediaRouteActionProvider connection dialog theme

I've tried to change theme of the MediaRouteActionProvider connection dialog. I using in my application a Light theme with Dark Actionbar, so the dialog have dark gray content, but the background is dark..
When the app is connected to a device, the other dialogs are ok, they have white background with the correct theme. (For exmaple in VideoMediaRouteControllerDialog and on the disconnect dialog.)
Have you any idea, how can I change the connection dialog's theme?
Thank you very much!
//Screenshot 1: Connection dialog (with the theme issue)
//Screenshot 2: Controller dialog (with the right, needed theme)

Unfortunately that dialog doesn't follow the standard theme (Dialogs in Android are all pretty unfriendly in general but that one is among the hardest to work with). Since that dialog is provided by media router, you can only provide a customized theme if you replace that completely with your own dialog.
You can try subclassing MediaRouteDialogFactory and override onCreateChooserDialogFragment() method and pass your implementation to the ActionProvide:
mediaRouteActionProvider.setDialogFactory(yourDialogFactoryImlementation)
You can take a look at the CCL where I do a similar thing not for the chooser dialog but for the controller.

Right now theming these Dialogs have issue - wrong theme applied to Dialog
You can override themes used in MediaRouterThemeHelper
<style name="Theme.MediaRouter.Light.DarkControlPanel">
<item name="mediaRoutePlayDrawable">#drawable/mr_ic_play_dark</item>
<item name="mediaRoutePauseDrawable">#drawable/mr_ic_pause_dark</item>
<item name="mediaRouteCastDrawable">#drawable/mr_ic_cast_dark</item>
<item name="mediaRouteAudioTrackDrawable">#drawable/ic_audiotrack</item>
<item name="mediaRouteControllerPrimaryTextStyle">#style/Widget.MediaRouter.ControllerText.Primary.Dark</item>
<item name="mediaRouteControllerSecondaryTextStyle">#style/Widget.MediaRouter.ControllerText.Secondary.Dark</item>
</style>
<style name="Theme.MediaRouter.LightControlPanel">
<item name="mediaRoutePlayDrawable">#drawable/mr_ic_play_light</item>
<item name="mediaRoutePauseDrawable">#drawable/mr_ic_pause_light</item>
<item name="mediaRouteCastDrawable">#drawable/mr_ic_cast_light</item>
<item name="mediaRouteAudioTrackDrawable">#drawable/mr_ic_audiotrack_light</item>
<item name="mediaRouteControllerPrimaryTextStyle">#style/Widget.MediaRouter.ControllerText.Primary.Light</item>
<item name="mediaRouteControllerSecondaryTextStyle">#style/Widget.MediaRouter.ControllerText.Secondary.Light</item>
</style>

What I did was pulling the mediarouter appcompat library source from GitHub, then I fixing the theming and rebuilding the whole thing into my own custom mediarouter library.
What you're looking for in the code is MediaRouteChooserDialog, and even there, the constructor that only takes a Context as a parameter, as that's the one being called by onCreateChooserDialog() in MediaRouteChooserDialogFragment.
I was lazy so I simply put android.R.style.Theme_Holo_Light_Dialog instead of the 0 in the constructor, and it worked just fine. But of course you can always look for a more sophisticated solution.

I made it work similar as #Naddaf described it. You need to extend MediaRouteDialogFactory (you can set this to the MediaRouteActionProvider or MediaRouteButton with setDialogFactory() ) and override the method:
#Override
public MediaRouteChooserDialogFragment onCreateChooserDialogFragment(){
return new CustomMediaRouteChooserDialogFragment();
}
Then in your CustomMediaRouteChooserDialogFragment override:
#Override
public CustomMediaRouteChooserDialog onCreateChooserDialog(Context context, Bundle savedInstanceState)
{
return new CustomMediaRouteChooserDialog(context);
}
And in the CustomMediaRouteChooserDialog create a constructor, where you set your holo light theme.
public CustomMediaRouteChooserDialog(Context context)
{
super(context, android.R.style.Theme_Holo_Light_Dialog);
}
Hope this helps!

Based on the other answers, this worked for me:
set a custom action provider in the menu item
<item
android:id="#+id/media_route_menu_item"
android:title="#string/cast_menu_title"
app:actionProviderClass="MediaRouteActionProviderThemeLight"
app:showAsAction="always"/>
this is the custom action provider using a light theme
public class MediaRouteActionProviderThemeLight extends MediaRouteActionProvider {
private static final int THEME_DIALOG = android.support.v7.mediarouter.R.style.Theme_MediaRouter_Light;
/**
* Creates the action provider.
*
* #param context The context.
*/
public MediaRouteActionProviderThemeLight(Context context) {
super(context);
setDialogFactory(new MediaRouteDialogFactoryThemeLight());
}
private static class MediaRouteDialogFactoryThemeLight extends MediaRouteDialogFactory {
#NonNull
#Override
public MediaRouteChooserDialogFragment onCreateChooserDialogFragment() {
return new MediaRouteChooserDialogFragmentThemeLight();
}
#NonNull
#Override
public MediaRouteControllerDialogFragment onCreateControllerDialogFragment() {
return new MediaRouteControllerDialogFragmentThemeLight();
}
}
public static class MediaRouteChooserDialogFragmentThemeLight extends MediaRouteChooserDialogFragment {
#Override
public MediaRouteChooserDialog onCreateChooserDialog(Context context, Bundle savedInstanceState) {
return new MediaRouteChooserDialog(context, THEME_DIALOG);
}
}
public static class MediaRouteControllerDialogFragmentThemeLight extends MediaRouteControllerDialogFragment {
#Override
public MediaRouteControllerDialog onCreateControllerDialog(Context context, Bundle savedInstanceState) {
return new MediaRouteControllerDialog(context, THEME_DIALOG);
}
}
}
take into account the dialog with play/pause buttons and volume control use the material colors from your main theme, colorPrimary as background and textColorPrimary for the title/subtitle. In case your app use dark theme you should overwrite the background using the theme below, and change the THEME_DIALOG constant in the class MediaRouteActionProviderThemeLight:
<style name="CastAppThemeMediaRouter" parent="Theme.MediaRouter.Light">
<item name="colorPrimaryDark">#color/primary_dark_material_light</item>
<item name="colorPrimary">#color/primary_material_light</item>
<item name="colorAccent">#color/accent_material_light</item>
</style>
To use a light theme with dark controls use the following theme. Be sure to set as primaryColor a dark color, the volume bar is set to light/dark automatically based in the primaryColor.
<style name="CastThemeMediaRouter" parent="Theme.MediaRouter.Light.DarkControlPanel">
<item name="colorPrimary">#color/black</item>
</style>

Change ActionMode Overflow icon

Is there a way to change the ActionMode Overflow icon without changing the icon for the "normal" ActionBar?

I still need to figure out how to only change the Overflow-Icon inside of the ActionMode-Actionbar as I changed my Overflow-Icon in the default-Actionbar which is not visible in the ActionMode-Actionbar (and no, I don't want to change the background of my ActionMode-Actionbar!)
Okay.
Let's start with defining some styles. I will try and explain why we are defining them in this fashion:
// This is just your base theme. It will probably include a lot more stuff.
// We are going to define the style 'OverflowActionBar' next.
<style name="BaseTheme" parent="android:Theme.Holo.Light">
....
....
....
<item name="android:actionOverflowButtonStyle">#style/OverflowActionBar</item>
</style>
// Assigning a parent to this style is important - we will inherit two attributes -
// the background (state-selector) and the content description
<style name="OverflowActionBar" parent="#android:style/Widget.Holo.ActionButton.Overflow">
<item name="android:src">#drawable/overflow_menu_light</item>
</style>
// Next up is an extension to our 'BaseTheme'. Notice the parent here.
<style name="ChangeOverflowToDark" parent="#style/BaseTheme">
<item name="android:actionOverflowButtonStyle">#style/OverflowActionMode</item>
</style>
// One last thing is to define 'OverflowActionMode'. Again, we inherit useful
// attributes by assigning 'Widget.Holo.ActionButton.Overflow' as the parent.
<style name="OverflowActionMode" parent="#android:style/Widget.Holo.ActionButton.Overflow">
<item name="android:src">#drawable/overflow_menu_dark</item>
</style>
All our work with styles.xml is done. The very last bit happens at runtime. I suppose you already have an implementation of ActionMode.Callback.
In your activity, define a method - changeOverflowIcon():
public void changeOverflowIcon() {
getTheme().applyStyle(R.style.ChangeOverflowToDark, true);
}
You will be calling this method from onCreateActionMode(...) of your ActionMode.Callback implementation:
public class CustomActionModeCallback implements ActionMode.Callback {
#Override
public boolean onCreateActionMode(ActionMode mode, Menu menu) {
changeOverflowIcon()
// other initialization
return true;
}
#Override
public boolean onPrepareActionMode(final ActionMode mode, Menu menu) {
return true;
}
#Override
public boolean onActionItemClicked(ActionMode mode, MenuItem item) {
return false;
}
#Override
public void onDestroyActionMode(ActionMode mode) {}
}
A bit of explanation:
The assignment in 'BaseTheme' is for the ActionBar. It will pick the drawable overflow_menu_light since we are assigning it in the base theme of your app.
getTheme().applyStyle(R.style.ChangeOverflowToDark, true)
The second argument true forces the current theme to override the old attributes with the new ones. Since we only define one attribute in ChangeOverflowToDark, its value is overwritten. The ActionBar is not affected because it has already used the old attribute. But, the action mode is yet to be created (it will be created when we return true from onCreateActionMode(...)). When the action mode checks for this attributes value, it gets the new one.
There's more...
The answer given by Manish is quite awesome. I could have never thought of using the content description to find the exact ImageButton. But what if you could find the ImageButton using a straightforward findViewById()?
Here's how you can:
First, we will need unique ids. If your project doesn't currently have a res/values/ids.xml file, create one. Add a new id to it:
<item type="id" name="my_custom_id" />
The setup I discussed above will remain the same. The only difference will be in OverflowActionMode style:
<style name="OverflowActionMode" parent="#android:style/Widget.Holo.ActionButton.Overflow">
<item name="android:src">#drawable/overflow_menu_dark</item>
<item name="android:id">#id/my_custom_id</item>
</style>
The id we defined above will be assigned to the ImageButton when we call getTheme().applyStyle(R.style.ChangeOverflowToDark, true);
I'll borrow the code snippet from Manish's answer here:
private ActionMode.Callback mCallback = new ActionMode.Callback()
{
#Override
public boolean onPrepareActionMode( ActionMode mode, Menu menu )
{
mDecorView.postDelayed(new Runnable() {
#Override
public void run() {
ImageButton btn = (ImageButton) mDecorView.findViewById(R.id.my_custom_id);
// Update the image here.
btn.setImageResource(R.drawable.custom);
}
}, 500); // 500 ms is quite generous // I would say that 50 will work just fine
return true;
}
}
Best of both worlds?
Let's say we need R.drawable.overflow_menu_light for ActionBar and R.drawable.overflow_menu_dark for ActionMode.
Styles:
<style name="BaseTheme" parent="android:Theme.Holo.Light">
....
....
....
<item name="android:actionOverflowButtonStyle">#style/OverflowActionMode</item>
</style>
<style name="OverflowActionMode" parent="#android:style/Widget.Holo.ActionButton.Overflow">
<item name="android:src">#drawable/overflow_menu_dark</item>
<item name="android:id">#id/my_custom_id</item>
</style>
As defined in our style, the ActionBar will pick R.drawable.overflow_menu_dark - but don't we need the light version for the ActionBar? Yes - we will assign that in the activity's onPrepareOptionsMenu(Menu) callback:
#Override
public boolean onPrepareOptionsMenu(Menu menu) {
new Handler().postDelayed(new Runnable() {
#Override
public void run() {
ImageButton ib = (ImageButton)
getWindow().getDecorView()
.findViewById(R.id.my_custom_id);
if (ib != null)
ib.setImageResource(R.drawable.overflow_menu_light);
}
}, 50L);
return super.onPrepareOptionsMenu(menu);
}
We are doing this here because before onPrepareOptionsMenu(Menu), the ImageButton would not have been created.
Now, we don't need to deal with ActionMode - because it will pick the dark drawable from the theme.
My apologies for this gigantic post. I really hope it helps.

ImageButton is the widget used to display the menu overflow. actionOverflowButtonStyle is used for styling the ImageButton. This styling is applied in ActionMenuPresenter.
private class OverflowMenuButton extends ImageButton implements ActionMenuChildView {
public OverflowMenuButton(Context context) {
super(context, null, com.android.internal.R.attr.actionOverflowButtonStyle);
...
}
}
ActionMenuPresenter class is used for building action menus both in action bar and action modes. Hence by overriding the theme files will apply same style in both modes. The only way to accomplish is it programatically as it is done here for the action bar.
Here is the code of how it can be done for action mode overflow icon. You can assign the drawable to the ImageButton in ActionMode.Callback.onPrepareActionMode method.
public class MainActivity extends Activity {
ViewGroup mDecorView;
public void onCreate(Bundle savedInstanceState) {
// Assign mDecorView to later use in action mode callback
mDecorView = (ViewGroup) getWindow().getDecorView();
}
private ActionMode.Callback mCallback = new ActionMode.Callback()
{
#Override
public boolean onPrepareActionMode( ActionMode mode, Menu menu )
{
// We have to update the icon after it is displayed,
// hence this postDelayed variant.
// This is what I don't like, but it is the only way to move forward.
mDecorView.postDelayed(new Runnable() {
#Override
public void run() {
ArrayList<View> outViews = new ArrayList<View>();
// The content description of overflow button is "More options".
// If you want, you can override the style and assign custom content
// description and use it here.
mDecorView.findViewsWithText(outViews, "More Options", View.FIND_VIEWS_WITH_CONTENT_DESCRIPTION);
if(!outViews.isEmpty()) {
View v = outViews.get(0);
if(v instanceof ImageButton) {
ImageButton btn = (ImageButton) v;
// Update the image here.
btn.setImageResource(R.drawable.custom);
}
}
}
}, 500);
return true;
}
}
}

You should be able to do that using styles:
ActionBarSherlock:
<style name="MyTheme" parent="Theme.Sherlock.Light">
<item name="actionOverflowButtonStyle">#style/MyTheme.OverFlow</item>
</style>
<style name="MyTheme.OverFlow" parent="Widget.Sherlock.ActionButton.Overflow">
<item name="android:src">#drawable/YOUR_ICON_GOES_HERE</item>
</style>
ActioBar:
<style name="MyTheme" parent="#android:style/Theme.Holo">
<item name="android:actionOverflowButtonStyle">#style/MyTheme.OverFlow</item>
</style>
<style name="MyTheme.OverFlow" parent="#android:style/Widget.Holo.ActionButton.Overflow">
<item name="android:src">#drawable/YOUR_ICON_GOES_HERE</item>
</style>
Make sure to set MyTheme in the manifest.

Is there a way to change the ActionMode Overflow icon without changing the icon for the "normal" ActionBar?
Regards how to change the overflow icon, I think there are many answers as above.
If you just want to change the color of the overflow icon, you can use a simple way.
<style name="BaseAppTheme" parent="Theme.xxxx.Light.NoActionBar.xxx">
...
<item name="actionOverflowButtonStyle">#style/ActionMode.OverFlow</item>
</style>
<style name="ActionMode.OverFlow" parent="#style/Widget.AppCompat.ActionButton.Overflow">
<item name="android:tint">#color/black</item> #or any color you want.#
</style>
It works for me. I investigated a bit, just check this screenshot http://prntscr.com/vqx1ov you will know the reason.
And I don't suggest to set the colour of colorControlNormal, it will change the color of "back arrow" and "overflow icon" on ActionBar.

In my case, I just want a different color of the three dots icon, and to achieve it, I set <item name="actionBarTheme">#style/Widget.ActionMode.ActionBar</item> in my theme, and Widget.ActionMode.ActionBar looks like below:
<style name="Widget.ActionMode.ActionBar" parent="#style/ThemeOverlay.AppCompat.Light">
<item name="colorControlNormal">the color I want</item>
</style>

How to set default font family for entire Android app

I'm using the Roboto light font in my app. To set the font I've to add the android:fontFamily="sans-serif-light" to every view. Is there any way to declare the Roboto font as default font family to entire app? I've tried like this but it didn't seem to work.
<style name="AppBaseTheme" parent="android:Theme.Light"></style>
<style name="AppTheme" parent="AppBaseTheme">
<item name="android:fontFamily">sans-serif-light</item>
</style>

The answer is yes.
Global Roboto light for TextView and Button classes:
<style name="AppTheme" parent="AppBaseTheme">
<item name="android:textViewStyle">#style/RobotoTextViewStyle</item>
<item name="android:buttonStyle">#style/RobotoButtonStyle</item>
</style>
<style name="RobotoTextViewStyle" parent="android:Widget.TextView">
<item name="android:fontFamily">sans-serif-light</item>
</style>
<style name="RobotoButtonStyle" parent="android:Widget.Holo.Button">
<item name="android:fontFamily">sans-serif-light</item>
</style>
Just select the style you want from list themes.xml, then create your custom style based on the original one. At the end, apply the style as the theme of the application.
<application
android:theme="#style/AppTheme" >
</application>
It will work only with built-in fonts like Roboto, but that was the question. For custom fonts (loaded from assets for example) this method will not work.
EDIT 08/13/15
If you're using AppCompat themes, remember to remove android: prefix. For example:
<style name="AppTheme" parent="Theme.AppCompat.Light.DarkActionBar">
<item name="android:textViewStyle">#style/RobotoTextViewStyle</item>
<item name="buttonStyle">#style/RobotoButtonStyle</item>
</style>
Note the buttonStyle doesn't contain android: prefix, but textViewStyle must contain it.

With the release of Android Oreo you can use the support library to reach this goal.
Check in your app build.gradle if you have the support library >=
26.0.0
Add "font" folder to your resources folder and add your fonts there
Reference your default font family in your app main style:
<style name="AppTheme" parent="Theme.AppCompat.Light.NoActionBar">
<item name="android:fontFamily">#font/your_font</item>
<item name="fontFamily">#font/your_font</item> <!-- target android sdk versions < 26 and > 14 if theme other than AppCompat -->
</style>
Check https://developer.android.com/guide/topics/ui/look-and-feel/fonts-in-xml.html for more detailed information.

To change your app font follow the following steps:
Inside res directory create a new directory and name it font.
Insert your font .ttf/.otf inside the font folder, Make sure the font name is lower case letters and underscore only.
Inside res -> values -> styles.xml inside <resources> -> <style> add your font <item name="android:fontFamily">#font/font_name</item>.
Now all your app text should be in the font that you add.

READ UPDATES BELOW
I had the same issue with embedding a new font and finally got it to work with extending the TextView and set the typefont inside.
public class YourTextView extends TextView {
public YourTextView(Context context, AttributeSet attrs, int defStyle) {
super(context, attrs, defStyle);
init();
}
public YourTextView(Context context, AttributeSet attrs) {
super(context, attrs);
init();
}
public YourTextView(Context context) {
super(context);
init();
}
private void init() {
Typeface tf = Typeface.createFromAsset(context.getAssets(),
"fonts/helveticaneue.ttf");
setTypeface(tf);
}
}
You have to change the TextView Elements later to from to in every element. And if you use the UI-Creator in Eclipse, sometimes he doesn't show the TextViews right. Was the only thing which work for me...
UPDATE
Nowadays I'm using reflection to change typefaces in whole application without extending TextViews. Check out this SO post
UPDATE 2
Starting with API Level 26 and available in 'support library' you can use
android:fontFamily="#font/embeddedfont"
Further information: Fonts in XML

Add this line of code in your res/value/styles.xml
<item name="android:fontFamily">#font/circular_medium</item>
the entire style will look like that
<style name="AppTheme" parent="Theme.AppCompat.Light.DarkActionBar">
<!-- Customize your theme here. -->
<item name="colorPrimary">#color/colorPrimary</item>
<item name="colorPrimaryDark">#color/colorPrimaryDark</item>
<item name="colorAccent">#color/colorAccent</item>
<item name="android:fontFamily">#font/circular_medium</item>
</style>
change "circular_medium" to your own font name..

It's very very very easy to do in Android Studio.
In this method you need to verify your minsdkveriosn. It must need minsdkversion >=16
Create "font" folder inside "res" folder. In android studio New > Folder > Font Folder.
Upload your font file to that font folder.
In you style.xml file, Under style in "Base application theme" add this line.
<item name="android:fontFamily">#font/ubuntubold</item>
More Details:
https://coderog.com/community/threads/how-to-set-default-font-family-for-entire-android-app.72/

Not talk about performance, for custom font you can have a recursive method loop through all the views and set typeface if it's a TextView:
public class Font {
public static void setAllTextView(ViewGroup parent) {
for (int i = parent.getChildCount() - 1; i >= 0; i--) {
final View child = parent.getChildAt(i);
if (child instanceof ViewGroup) {
setAllTextView((ViewGroup) child);
} else if (child instanceof TextView) {
((TextView) child).setTypeface(getFont());
}
}
}
public static Typeface getFont() {
return Typeface.createFromAsset(YourApplicationContext.getInstance().getAssets(), "fonts/whateverfont.ttf");
}
}
In all your activity, pass current ViewGroup to it after setContentView and it's done:
ViewGroup group = (ViewGroup) getWindow().getDecorView().findViewById(android.R.id.content);
Font.setAllTextView(group);
For fragment you can do something similar.

Another way to do this for the whole app is using reflection based on this answer
public class TypefaceUtil {
/**
* Using reflection to override default typefaces
* NOTICE: DO NOT FORGET TO SET TYPEFACE FOR APP THEME AS DEFAULT TYPEFACE WHICH WILL BE
* OVERRIDDEN
*
* #param typefaces map of fonts to replace
*/
public static void overrideFonts(Map<String, Typeface> typefaces) {
try {
final Field field = Typeface.class.getDeclaredField("sSystemFontMap");
field.setAccessible(true);
Map<String, Typeface> oldFonts = (Map<String, Typeface>) field.get(null);
if (oldFonts != null) {
oldFonts.putAll(typefaces);
} else {
oldFonts = typefaces;
}
field.set(null, oldFonts);
field.setAccessible(false);
} catch (Exception e) {
Log.e("TypefaceUtil", "Can not set custom fonts");
}
}
public static Typeface getTypeface(int fontType, Context context) {
// here you can load the Typeface from asset or use default ones
switch (fontType) {
case BOLD:
return Typeface.create(SANS_SERIF, Typeface.BOLD);
case ITALIC:
return Typeface.create(SANS_SERIF, Typeface.ITALIC);
case BOLD_ITALIC:
return Typeface.create(SANS_SERIF, Typeface.BOLD_ITALIC);
case LIGHT:
return Typeface.create(SANS_SERIF_LIGHT, Typeface.NORMAL);
case CONDENSED:
return Typeface.create(SANS_SERIF_CONDENSED, Typeface.NORMAL);
case THIN:
return Typeface.create(SANS_SERIF_MEDIUM, Typeface.NORMAL);
case MEDIUM:
return Typeface.create(SANS_SERIF_THIN, Typeface.NORMAL);
case REGULAR:
default:
return Typeface.create(SANS_SERIF, Typeface.NORMAL);
}
}
}
then whenever you want to override the fonts you can just call the method and give it a map of typefaces as follows:
Typeface regular = TypefaceUtil.getTypeface(REGULAR, context);
Typeface light = TypefaceUtil.getTypeface(REGULAR, context);
Typeface condensed = TypefaceUtil.getTypeface(CONDENSED, context);
Typeface thin = TypefaceUtil.getTypeface(THIN, context);
Typeface medium = TypefaceUtil.getTypeface(MEDIUM, context);
Map<String, Typeface> fonts = new HashMap<>();
fonts.put("sans-serif", regular);
fonts.put("sans-serif-light", light);
fonts.put("sans-serif-condensed", condensed);
fonts.put("sans-serif-thin", thin);
fonts.put("sans-serif-medium", medium);
TypefaceUtil.overrideFonts(fonts);
for full example check
This only works for Android SDK 21 and above for earlier versions check the full example

Just use this lib compile it in your grade file
complie'me.anwarshahriar:calligrapher:1.0'
and use it in the onCreate method in the main activity
Calligrapher calligrapher = new Calligrapher(this);
calligrapher.setFont(this, "yourCustomFontHere.ttf", true);
This is the most elegant super fast way to do that.

This is work for my project, source https://gist.github.com/artem-zinnatullin/7749076
Create fonts directory inside Asset Folder and then copy your custom font to fonts directory, example I am using trebuchet.ttf;
Create a class TypefaceUtil.java;
import android.content.Context;
import android.graphics.Typeface;
import android.util.Log;
import java.lang.reflect.Field;
public class TypefaceUtil {
public static void overrideFont(Context context, String defaultFontNameToOverride, String customFontFileNameInAssets) {
try {
final Typeface customFontTypeface = Typeface.createFromAsset(context.getAssets(), customFontFileNameInAssets);
final Field defaultFontTypefaceField = Typeface.class.getDeclaredField(defaultFontNameToOverride);
defaultFontTypefaceField.setAccessible(true);
defaultFontTypefaceField.set(null, customFontTypeface);
} catch (Exception e) {
}
}
}
Edit theme in styles.xml add below
<item name="android:typeface">serif</item>
Example in My styles.xml
<resources>
<!-- Base application theme. -->
<style name="AppTheme" parent="Theme.AppCompat.Light.DarkActionBar">
<!-- Customize your theme here. -->
<item name="colorPrimary">#color/colorPrimary</item>
<item name="colorPrimaryDark">#color/colorPrimaryDark</item>
<item name="colorAccent">#color/colorAccent</item>
<item name="android:typeface">serif</item><!-- Add here -->
</style>
<style name="AppTheme.NoActionBar">
<item name="windowActionBar">false</item>
<item name="windowNoTitle">true</item>
<item name="android:windowActionBarOverlay">true</item>
<item name="android:windowFullscreen">true</item>
</style>
</resources>
Finally, in Activity or Fragment onCreate call TypefaceUtil.java
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
TypefaceUtil.overrideFont(getContext(), "SERIF", "fonts/trebuchet.ttf");
}

Android does not provide much in the way of support for applying fonts across the whole app (see this issue). You have 4 options to set the font for the entire app:
Option1: Apply reflection to change the system font
Option2: Create and subclass custom View classes for each View that needs a custom font
Option3: Implement a View Crawler which traverses the view
hierarchy for the current screen
Option4: Use a 3rd party library.
Details of these options can be found here.

I know this question is quite old, but I have found a nice solution.
Basically, you pass a container layout to this function, and it will apply the font to all supported views, and recursively cicle in child layouts:
public static void setFont(ViewGroup layout)
{
final int childcount = layout.getChildCount();
for (int i = 0; i < childcount; i++)
{
// Get the view
View v = layout.getChildAt(i);
// Apply the font to a possible TextView
try {
((TextView) v).setTypeface(MY_CUSTOM_FONT);
continue;
}
catch (Exception e) { }
// Apply the font to a possible EditText
try {
((TextView) v).setTypeface(MY_CUSTOM_FONT);
continue;
}
catch (Exception e) { }
// Recursively cicle into a possible child layout
try {
ViewGroup vg = (ViewGroup) v;
Utility.setFont(vg);
continue;
}
catch (Exception e) { }
}
}

to merely set typeface of app to normal, sans, serif or monospace(not to a custom font!), you can do this.
define a theme and set the android:typeface attribute to the typeface you want to use in styles.xml:
<resources>
<!-- custom normal activity theme -->
<style name="AppTheme" parent="Theme.AppCompat.Light.DarkActionBar">
<item name="colorPrimary">#color/colorPrimary</item>
<item name="colorPrimaryDark">#color/colorPrimaryDark</item>
<item name="colorAccent">#color/colorAccent</item>
<!-- other elements -->
<item name="android:typeface">monospace</item>
</style>
</resources>
apply the theme to the whole app in the AndroidManifest.xml file:
<?xml version="1.0" encoding="utf-8"?>
<manifest ... >
<application
android:theme="#style/AppTheme" >
</application>
</manifest>
android reference

Try this library, its lightweight and easy to implement
https://github.com/sunnag7/FontStyler
<com.sunnag.fontstyler.FontStylerView
android:textStyle="bold"
android:text="#string/about_us"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:paddingTop="8dp"
app:fontName="Lato-Bold"
android:textSize="18sp"
android:id="#+id/textView64" />

This is how we do it:
private static void OverrideDefaultFont(string defaultFontNameToOverride, string customFontFileNameInAssets, AssetManager assets)
{
//Load custom Font from File
Typeface customFontTypeface = Typeface.CreateFromAsset(assets, customFontFileNameInAssets);
//Get Fontface.Default Field by reflection
Class typeFaceClass = Class.ForName("android.graphics.Typeface");
Field defaultFontTypefaceField = typeFaceClass.GetField(defaultFontNameToOverride);
defaultFontTypefaceField.Accessible = true;
defaultFontTypefaceField.Set(null, customFontTypeface);
}

The answer is no, you can't.
See Is it possible to set a custom font for entire of application?
for more information.
There are workarounds, but nothing in the lines of "one single line of code here and all my fonts will be this instead of that".
(I kind of thank Google -and Apple- for that). Custom fonts have a place, but making them easy to replace app wide, would have created an entire world of Comic Sans applications)