Android: set view style programmatically

Question

Here's XML:

<RelativeLayout 
    xmlns:android="http://schemas.android.com/apk/res/android"
    style="@style/LightStyle"
    android:layout_width="fill_parent"
    android:layout_height="55dip"
    android:clickable="true"
    android:orientation="horizontal" >

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:orientation="horizontal" />

</RelativeLayout>

How to set style attribute programmatically?

Answer 1

I used views defined in XML in my composite ViewGroup, inflated them added to Viewgroup. This way I cannot dynamically change style but I can make some style customizations. My composite:

public class CalendarView extends LinearLayout {

private GridView mCalendarGrid;
private LinearLayout mActiveCalendars;

private CalendarAdapter calendarAdapter;

public CalendarView(Context context) {
    super(context);

}

public CalendarView(Context context, AttributeSet attrs) {
    super(context, attrs);

}

@Override
protected void onFinishInflate() {
    super.onFinishInflate();
    init();
}

private void init() {
    mCalendarGrid = (GridView) findViewById(R.id.calendarContents);
    mCalendarGrid.setNumColumns(CalendarAdapter.NUM_COLS);

    calendarAdapter = new CalendarAdapter(getContext());
    mCalendarGrid.setAdapter(calendarAdapter);
    mActiveCalendars = (LinearLayout) findViewById(R.id.calendarFooter);
}

}

and my view in xml where i can assign styles:

<com.mfitbs.android.calendar.CalendarView
xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/calendar"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_gravity="center_horizontal"
android:orientation="vertical"
>

<GridView
    android:id="@+id/calendarContents"
    android:layout_width="match_parent"
    android:layout_height="wrap_content" />

<LinearLayout
    android:id="@+id/calendarFooter"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:orientation="horizontal"
    />

Answer 2

You can create the xml containing the layout with the desired style and then change the background resource of your view, like this.

Answer 3

What worked for me:

Button b = new Button(new ContextThemeWrapper(this, R.style.ButtonText), null, 0);

• Use a ContextThemeWrapper

AND

• Use the 3-arguments constructor (won't work without this)

Answer 4

You can apply a style to your activity by doing:

super.setTheme( R.style.MyAppTheme );

or Android default:

super.setTheme( android.R.style.Theme );

in your activity, before setContentView().

Answer 5

Non of the provided answers are correct.

You CAN set style programatically.

Short answer is take a look at http://grepcode.com/file/repository.grepcode.com/java/ext/com.google.android/android/5.1.1_r1/android/content/Context.java#435

Long answer. Here's my snippet to set custom defined style programatically to your view:

1) Create a style in your styles.xml file

 <style name="MyStyle">
    <item name="customTextColor">#39445B</item>
    <item name="customDividerColor">#8D5AA8</item>
</style>

Do not forget to define your custom attributes in attrs.xml file

My attrsl.xml file:

<declare-styleable name="CustomWidget">
    <attr name="customTextColor" format="color" />
    <attr name="customDividerColor" format="color" />
</declare-styleable>

Notice you can use any name for your styleable (my CustomWidget)

Now lets set the style to the widget Programatically Here's My simple widget:

public class StyleableWidget extends LinearLayout {

private final StyleLoader styleLoader = new StyleLoader();

private TextView textView;
private View divider;

public StyleableWidget(Context context) {
    super(context);
    init();
}

private void init() {
    inflate(getContext(), R.layout.widget_styleable, this);
    textView = (TextView) findViewById(R.id.text_view);
    divider = findViewById(R.id.divider);
    setOrientation(VERTICAL);
}

protected void apply(StyleLoader.StyleAttrs styleAttrs) {
    textView.setTextColor(styleAttrs.textColor);
    divider.setBackgroundColor(styleAttrs.dividerColor);
}

public void setStyle(@StyleRes int style) {
    apply(styleLoader.load(getContext(), style));
}
}

layout:

<TextView
    android:id="@+id/text_view"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:textSize="22sp"
    android:layout_gravity="center"
    android:text="@string/styleble_title" />

<View
    android:id="@+id/divider"
    android:layout_width="match_parent"
    android:layout_height="1dp"/>

</merge>

And finally StyleLoader class implementation

public class StyleLoader {

public StyleLoader() {

}

public static class StyleAttrs {
    public int textColor;
    public int dividerColor;
}

public StyleAttrs load(Context context, @StyleRes int styleResId) {
    final TypedArray styledAttributes = context.obtainStyledAttributes(styleResId, R.styleable.CustomWidget);
    return load(styledAttributes);
}

@NonNull
private StyleAttrs load(TypedArray styledAttributes) {
    StyleAttrs styleAttrs = new StyleAttrs();
    try {
        styleAttrs.textColor = styledAttributes.getColor(R.styleable.CustomWidget_customTextColor, 0);
        styleAttrs.dividerColor = styledAttributes.getColor(R.styleable.CustomWidget_customDividerColor, 0);
    } finally {
        styledAttributes.recycle();
    }
    return styleAttrs;
}
}

You can find fully working example at https://github.com/Defuera/SetStylableProgramatically