I'm trying to use the TextView constructor with style like this:
TextView myText = new TextView(MyActivity.this, null, R.style.my_style);
However, when I do this, the text view does not appear to take the style (I verified the style by setting it on a static object).
I've also tried using myText.setTextAppearance(MyActivity.this, R.style.my_style) but it also doesn't work.
I do not believe you can set the style programatically. To get around this you can create a template layout xml file with the style assigned, for example in res/layout create tvtemplate.xml as with the following content:
<?xml version="1.0" encoding="utf-8"?>
<TextView xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="This is a template"
style="#style/my_style" />
then inflate this to instantiate your new TextView:
TextView myText = (TextView)getLayoutInflater().inflate(R.layout.tvtemplate, null);
You can create a generic style and re-use it on multiple textviews like the one below:
textView.setTextAppearance(this, R.style.MyTextStyle);
Edit: this refers to the Context object.
You can pass a ContextThemeWrapper to the constructor like this:
TextView myText = new TextView(new ContextThemeWrapper(MyActivity.this, R.style.my_style));
You can set the style in the constructor (but styles can not be dynamically changed/set).
View(Context, AttributeSet, int) (the int is an attribute in the current theme that contains a reference to a style)
Answer from Romain Guy
reference
Parameter int defStyleAttr does not specifies the style. From the Android documentation:
defStyleAttr - An attribute in the current theme that contains a
reference to a style resource that supplies default values for the
view. Can be 0 to not look for defaults.
To setup the style in View constructor we have 2 possible solutions:
With use of ContextThemeWrapper:
ContextThemeWrapper wrappedContext = new ContextThemeWrapper(yourContext, R.style.your_style);
TextView textView = new TextView(wrappedContext, null, 0);
With four-argument constructor (available starting from LOLLIPOP):
TextView textView = new TextView(yourContext, null, 0, R.style.your_style);
Key thing for both solutions - defStyleAttr parameter should be 0 to apply our style to the view.
Dynamically changing styles is not supported (yet). You have to set the style before the view gets created, via XML.
When using custom views that may use style inheritance (or event styleable attributes), you have to modify the second constructor in order not to lose the style. This worked for me, without needing to use setTextAppearence():
public CustomView(Context context, AttributeSet attrs) {
this(context, attrs, attrs.getStyleAttribute());
}
The accepted answer was great solution for me. The only thing to add is about inflate() method.
In accepted answer all android:layout_* parameters will not be applied.
The reason is no way to adjust it, cause null was passed as ViewGroup parent.
You can use it like this:
View view = inflater.inflate(R.layout.view, parent, false);
and the parent is the ViewGroup, from where you like to adjust android:layout_*.
In this case, all relative properties will be set.
Hope it'll be useful for someone.
I met the problem too, and I found the way to set style programatically. Maybe you all need it, So I update there.
The third param of View constructor accepts a type of attr in your theme as the source code below:
public TextView(Context context, AttributeSet attrs) {
this(context, attrs, com.android.internal.R.attr.textViewStyle);
}
So you must pass a type of R.attr.** rather than R.style.**
In my codes, I did following steps:
First, customize a customized attr to be used by themes in attr.xml.
<attr name="radio_button_style" format="reference" />
Second, specific your style in your used theme in style.xml.
<style name="AppTheme" parent="android:Theme.Translucent">
<!-- All customizations that are NOT specific to a particular API-level can go here. -->
<item name="radio_button_style">#style/radioButtonStyle</item>
</style>
<style name="radioButtonStyle" parent="#android:style/Widget.CompoundButton.RadioButton">
<item name="android:layout_width">wrap_content</item>
<item name="android:layout_height">64dp</item>
<item name="android:background">#000</item>
<item name="android:button">#null</item>
<item name="android:gravity">center</item>
<item name="android:saveEnabled">false</item>
<item name="android:textColor">#drawable/option_text_color</item>
<item name="android:textSize">9sp</item>
</style>
At the end, use it!
RadioButton radioButton = new RadioButton(mContext, null, R.attr.radio_button_style);
the view created programatically will use the specified style in your theme.
You can have a try, and hope it can work for you perfectly.
We can use TextViewCompact.setTextAppearance(textView, R.style.xyz).
Android doc for reference.
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M)
textView.setTextAppearance(R.style.yourStyle)
you can use Extension Functions kotlin
fun TextView.setStyle(#StyleRes resId: Int) {
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
setTextAppearance(resId)
} else {
setTextAppearance(context, resId)
}
}
I have only tested with EditText but you can use the method
public void setBackgroundResource (int resid)
to apply a style defined in an XML file.
Sine this method belongs to View I believe it will work with any UI element.
regards.
Related
I need to add a variable number of Seekbars depending on configuration.
for(int i=0;i<length;i++){
seeks[i] = new SeekBar(getActivity());
seeks[i].setMax(4);
LinearLayout.LayoutParams layoutParams = new LinearLayout.LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT, ViewGroup.LayoutParams.WRAP_CONTENT);
layoutParams.setMargins(30,30,30,30);
seeks[i].setLayoutParams(layoutParams);
ll.addView(seeks[i]);
seeks[i].setVisibility(View.VISIBLE);
Works perfectly, but I would like the Seekbar to be discrete. In XML you can just add:
<SeekBar
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:theme="#style/Base.Widget.AppCompat.SeekBar.Discrete"/>
However, if I follow the Docs, you should be able to add a Theme in the Seekbar constructor like so:
seeks[i] = new SeekBar(getActivity(), null, R.style.myTheme2 );
where I have set the theme in the styles.xml, OR
seeks[i] = new SeekBar(getActivity(), null, R.style.Widget_AppCompat_SeekBar_Discrete);
However, as soon as I do either of those things, the Seekbar disappears from view completely.
Got it working, leaving up for others who have the same problem, as I couldn't find it anywhere:
First setup a layout for each individual SeekBar:
seekbar_base.xml
<?xml version="1.0" encoding="utf-8"?>
<SeekBar
xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:progressBackgroundTint="#color/seekBarBackground"
android:progressTint="#color/seekBarProgress"
android:thumbTint="#color/seekBar"
android:paddingLeft="20sp"
android:paddingTop="3dp"
android:paddingRight="20dp"
android:paddingBottom="30dp"
android:theme="#style/Widget.AppCompat.SeekBar.Discrete" />
Then instantiate it like so:
SeekBar bar = (SeekBar)LayoutInflater.from(getActivity()).inflate(R.layout.seekbar_base, null);
I still have no idea why it didn't work the way the docs said it should, but oh well.
when you use the XML, it actually set some default attribute. it is located in core / res / res / values / styles.xml
<style name="Widget.SeekBar">
<item name="android:indeterminateOnly">false</item>
<item name="android:progressDrawable">#android:drawable/progress_horizontal</item>
<item name="android:indeterminateDrawable">#android:drawable/progress_horizontal</item>
<item name="android:minHeight">20dip</item>
<item name="android:maxHeight">20dip</item>
<item name="android:thumb">#android:drawable/seek_thumb</item>
<item name="android:thumbOffset">8dip</item>
<item name="android:focusable">true</item>
</style>
at the same time, the SeekBar(Context context) also use the defalut style. it relaize that by call the same method you called, but set a defalut style.
public SeekBar(Context context) {
this(context, null);
}
public SeekBar(Context context, AttributeSet attrs) {
this(context, attrs, com.android.internal.R.attr.seekBarStyle);
}
so change your theme extends it.the add your custom item.
seeks[i] = new SeekBar(getActivity(), null, R.style.Widget_AppCompat_SeekBar_Discrete);
here are the document descirbe for three params constructor:
Perform inflation from XML and apply a class-specific base style from a
theme attribute. This constructor of View allows subclasses to use their
own base style when they are inflating. For example, a Button class's
constructor would call this version of the super class constructor and
supply R.attr.buttonStyle for defStyleAttr; this
allows the theme's button style to modify all of the base view attributes
(in particular its background) as well as the Button class's attributes.
I have an custom view which extends Button. And I just want to set the belove style to this view.
<style name="MultipleButtonStyle" parent="android:Widget.Material.Light.Spinner.Underlined">
<item name="android:textColor">#android:color/black</item>
<item name="android:textAppearance">?android:attr/textAppearanceMedium</item>
</style>
To be able set style programmatically, I have tried some way. But They didn't work for me.
The First way, is using the style in the constructor of the custom button like this :
public class SpinnerButton extends AppCompatButton{
public SpinnerButton (Context context) {
super(context, null, R.style.MultipleButtonStyle);
}
}
Second way is use setTextAppearance method. It didn't work me as well.
if (Build.VERSION.SDK_INT < 23) {
super.setTextAppearance(getContext(), R.style.MultipleButtonStyle );
} else {
super.setTextAppearance(R.style.MultipleButtonStyle);
}
your constructor looks fine, are you overriding also other ones (e.g. this with AttributeSet, which is called when inflating from XML)? check THIS question about Views constructors and some styling
second way is improper, because parent of your style is a style for whole Spinner.Underlined, not only for TextAppearance. in this case you should extend #android:style/TextAppearance.Medium (or other). if you choose this way then remember about deprecated setTextAppearance method in API23 and you may use some helper without checking OS version:
TextViewCompat.setTextAppearance(textView, android.R.style.TextAppearance_Medium);
I am looking to create a custom ViewGroup to be used in a library; which contains a few ImageButton objects. I would like to be able to apply a style each ImageButton; but I cannot figure out how to apply a style programmatically other than by applying a attribute resource to the defStyleAttr parameter; like so:
mImageButton = new ImageButton(
getContext(), // context
null, // attrs
R.attr.customImageButtonStyle); // defStyleAttr
The issue with this is that the only way to change the style of each ImageButton would be by applying a style to this attribute in a parent theme. But I would like to be able to set a default style, without having to manually set this attribute for each project that uses this library.
There is a parameter that does exactly what I am looking for; defStyleRes, which can be used like so:
mImageButton = new ImageButton(
getContext(), // context
null, // attrs
R.attr.customImageButtonStyle, // defStyleAttr
R.style.customImageButtonStyle); // defStyleRes
This parameter is only available at API Level 21 and above, but my projects target API Level 16 and above. So how can I set the defStyleRes, or apply a default style, without access to this parameter?
I applied my style using a ContextThemeWrapper, as suggested by #EugenPechanec, which seems to work well, but each ImageButton now has the default ImageButton background, even though my style applies <item name="android:background">#null</item>.
Here is the style I am using:
<style name="Widget.Custom.Icon" parent="android:Widget">
<item name="android:background">#null</item>
<item name="android:minWidth">56dp</item>
<item name="android:minHeight">48dp</item>
<item name="android:tint">#color/selector_light</item>
</style>
And this is how I am applying it:
ContextThemeWrapper wrapper = new ContextThemeWrapper(getContext(), R.style.Widget_Custom_Icon);
mImageButton = new AppCompatImageButton(wrapper);
On the left is what I am getting, and on the right is what I would like it to look like:
defStyleAttr is for resolving default widget style from theme attribute.
Example: AppCompatCheckBox asks for R.attr.checkBoxStyle. Your theme defines <item name="checkBoxStyle">#style/Widget.AppCompat.CheckBox</item>.
If that attribute is not defined in your theme the widget would pickup its defStyleRes e.g. R.style.Widget_AppCompat_CheckBox.
Note that these are not actual values used by the widget.
I have not seen defStyleRes constructor parameter used outside of the framework. All of these parameters (plus defaults) are however used when asking TypedArray for resources.
How to actually solve your problem
So the four parameter constructor is not available on all platforms. You need to find a way to feed in your default style. Consider a style you'd like to apply:
<style name="MyImageButtonStyle" parent=""> ... </style>
You need a way to convert it to a defStyleAttr parameter. Define the default style on a theme overlay:
<style name="MyImageButtonThemeOverlay" parent="">
<!-- AppCompat widgets don't use the android: prefix. -->
<item name="imageButtonStyle">#style/MyImageButtonStyle</item>
</style>
Now you can create your ImageButton using this theme overlay:
// When creating manually you have to include the AppCompat prefix.
mImageButton = new AppCompatImageButton(
new ContextThemeWrapper(getContext(), R.style.MyImageButtonThemeOverlay)
);
You don't need to specify any other parameters as AppCompatImageButton will pickup R.attr.imageButtonStyle by default.
If that looks hacky you can always inflate your custom view hierarchy or individual widgets from XML where you specified the style="#style/MyImageButtonStyle" attribute.
My app has several themes from which the user can chose (red, blue, green etc.) Every theme has a corresponding button style (RedTheme => RedButton).
Now I have created a custom view which slightly extends "Button" and unfortunately this button does not get any style, except I use the "style" attribute in a layout.xml.
I don’t use any additional attributes, I just want that my Button style is applied.
I want to do something similar than:
<item name="android:imageButtonStyle">#style/ImageButtonmyTimeRed</item>
I have already read many other posts like this one:
How to: Define theme (style) item for custom widget
but I’m not 100% sure if this solution fits for me since I don’t need any additional attributes.
I'm using the three parameter super constructor and pass the button style resource id. This works for all my custom themes. Thanks #pskink for pointing me into right direction.
public ClockButton(Context context, AttributeSet attrs) {
super(context, attrs, R.attr.buttonStyle);
...
}
My theme looks like this:
<style name="LilaTheme" parent="Theme.AppCompat.Light.NoActionBar">
<item name="buttonStyle">#style/ButtonmyTimeLila</item>
</style>
Does any body know how to set style for TextView at run time:
something like this
myTextView.setStyle(R.style.mystyle);
Very easy just use setTextApparence and your style
myTextView.setTextAppearance(getApplicationContext(), R.style.boldText);
you will have to manually set each element of the style that you change, there is no way to setStyle at run time, AFAIK.
myTextView.setTextAppearance
myTextView.setTextSize
myTextView.setTextColor
I also still did not find (sadly) a way to change Style at runtime.
If it is just about changing the checkbox appearance (as you mention in a comment of another answer), you can use this:
myCheckbox.setButtonDrawable(R.drawable.star_checkbox);
And have a star_checkbox.xml file in the drawable directory describing the checkbox background according to its states such as:
<?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android">
<item android:state_checked="true" android:state_focused="true"
android:drawable="#drawable/star_checkbox_checked_focused" />
<item android:state_checked="false" android:state_focused="true"
android:drawable="#drawable/checkbox_not_checked_focused" />
<item android:state_checked="false"
android:drawable="#drawable/checkbox_not_checked" />
<item android:state_checked="true"
android:drawable="#drawable/checkbox_checked" />
</selector>
Also you need the corresponding png files in you drawable directory.
I am trying myself to do a similar thing.
My reason is that I want to use a style from my own Theme, BUT my User Interface Layout is entirely generated in code( using a custom layout builder), without defining any widgets in XML. So I cannot set a style in the XML layout of my widget – there isn’t any XML layout.
I am thinking that I will be able to set this style in the code of my widget by using
TypedArray a =
context.obtainStyledAttributes(AttributeSet
set, int[] attrs, int defStyleAttr, int defStyleRes)
Here it seems (to me) that
AttributeSet set = null; because this is what the XML inflater would have provided.
int[] attrs = R.styleable.MyWidget; defines what attributes I want to look at.
int defStyleAttr = myWidgetStyle; which is a reference, defined in my Theme, to a style for MyWidget. These are both defined in XML files in res/values.
“myWidgetStyle” follows the pattern of name the android developers have used in their code.
defStyleRes = 0; I am hoping that I don’t need to think about this.
Then to get any property , such as a background color,
Color color = a.getColor(R.styleable.MyWidget_background, R.color.my_default);
a.recycle();
This does seem to work –so far anyway.
It seems that the android build system conveniently generates the correct index to use in a.getColor, and names it R.styleable.MyWidget_background . I didn’t make this name myself so Android must have done it using my XML for my styleable MyWidget.
I expect one can look up the correct index by searching the TypedArray for the required attribute , but that would be inefficient and the TypedArray looks like an unpleasant contraption to deal with. I would use a very long stick to poke it!
Don
TextView (Context context, AttributeSet attrs, int defStyle)
Although there is construction available but it seems its buggy, I tried this and found specified style won't apply on my view.
After searching further got this filed bug: http://code.google.com/p/android/issues/detail?id=12683
To workaround this issue I am using setBackgroundResource, setTextAppearance, etc methods dramatically :)