Java Examples for android.view.View.LAYOUT_DIRECTION_RTL

// Since the auto-mirrored state is only set to true if the SDK
// version supports it, we don't need an explicit check for that
// before calling getLayoutDirection().
@TargetApi(JELLY_BEAN_MR1)
@CheckResult
private boolean needMirroring() {
    if (isAutoMirrored()) {
        if (SDK_INT >= M) {
            return getLayoutDirection() == LayoutDirection.RTL;
        }
        // Since getLayoutDirection() is hidden prior to Marshmallow, we
        // will try to get the layout direction from the View, which we will
        // assume is set as the callback. As the setLayoutDirection() method
        // is also hidden, we can safely rely on the behaviour of the
        // platform Views to provide a correct replacement for the hidden
        // method.
        Callback callback = getCallback();
        if (callback instanceof View) {
            return ((View) callback).getLayoutDirection() == LAYOUT_DIRECTION_RTL;
        }
    }
    return false;
}

@TargetApi(Build.VERSION_CODES.JELLY_BEAN_MR1)
@Override
public void onRtlPropertiesChanged(int layoutDirection) {
    boolean rtl = layoutDirection == LAYOUT_DIRECTION_RTL;
    if (mIsRtl != rtl) {
        mIsRtl = rtl;
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.JELLY_BEAN_MR1) {
            int direction = mIsRtl ? TEXT_DIRECTION_RTL : TEXT_DIRECTION_LTR;
            mTitle.setTextDirection(direction);
            mPositiveAction.setTextDirection(direction);
            mNegativeAction.setTextDirection(direction);
            mNeutralAction.setTextDirection(direction);
        }
        requestLayout();
    }
}

/**
     * If the direction of the URL has changed, update mUrlDirection and notify the
     * UrlDirectionListeners.
     */
private void updateUrlDirection() {
    Layout layout = getLayout();
    if (layout == null)
        return;
    int urlDirection;
    if (length() == 0) {
        urlDirection = LAYOUT_DIRECTION_LOCALE;
    } else if (layout.getParagraphDirection(0) == Layout.DIR_LEFT_TO_RIGHT) {
        urlDirection = LAYOUT_DIRECTION_LTR;
    } else {
        urlDirection = LAYOUT_DIRECTION_RTL;
    }
    if (urlDirection != mUrlDirection) {
        mUrlDirection = urlDirection;
        if (mUrlDirectionListener != null) {
            mUrlDirectionListener.onUrlDirectionChanged(urlDirection);
        }
    }
}

/**
     * Return the layout direction for a given Locale
     *
     * @param locale the Locale for which we want the layout direction. Can be null.
     * @return the layout direction. This may be one of:
     * {@link android.view.View#LAYOUT_DIRECTION_LTR} or
     * {@link android.view.View#LAYOUT_DIRECTION_RTL}.
     *
     * Be careful: this code will need to be updated when vertical scripts will be supported
     */
public static int getLayoutDirectionFromLocale(Locale locale) {
    if (locale != null && !locale.equals(Locale.ROOT)) {
        final String scriptSubtag = ICU.getScript(ICU.addLikelySubtags(locale.toString()));
        if (scriptSubtag == null)
            return getLayoutDirectionFromFirstChar(locale);
        if (scriptSubtag.equalsIgnoreCase(ARAB_SCRIPT_SUBTAG) || scriptSubtag.equalsIgnoreCase(HEBR_SCRIPT_SUBTAG)) {
            return View.LAYOUT_DIRECTION_RTL;
        }
    }
    return View.LAYOUT_DIRECTION_LTR;
}

@TargetApi(Build.VERSION_CODES.JELLY_BEAN_MR1)
@Override
public void onRtlPropertiesChanged(int layoutDirection) {
    boolean rtl = layoutDirection == LAYOUT_DIRECTION_RTL;
    if (mIsRtl != rtl) {
        mIsRtl = rtl;
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.JELLY_BEAN_MR1) {
            int direction = mIsRtl ? TEXT_DIRECTION_RTL : TEXT_DIRECTION_LTR;
            mTitle.setTextDirection(direction);
            mPositiveAction.setTextDirection(direction);
            mNegativeAction.setTextDirection(direction);
            mNeutralAction.setTextDirection(direction);
        }
        requestLayout();
    }
}

/**
     * Return the layout direction for a given Locale
     *
     * @param locale the Locale for which we want the layout direction. Can be null.
     * @return the layout direction. This may be one of:
     * {@link android.view.View#LAYOUT_DIRECTION_LTR} or
     * {@link android.view.View#LAYOUT_DIRECTION_RTL}.
     *
     * Be careful: this code will need to be updated when vertical scripts will be supported
     */
public static int getLayoutDirectionFromLocale(Locale locale) {
    return ((locale != null && !locale.equals(Locale.ROOT) && ULocale.forLocale(locale).isRightToLeft()) || // If forcing into RTL layout mode, return RTL as default
    SystemProperties.getBoolean(Settings.Global.DEVELOPMENT_FORCE_RTL, false)) ? View.LAYOUT_DIRECTION_RTL : View.LAYOUT_DIRECTION_LTR;
}

/**
     * Return the layout direction for a given Locale
     *
     * @param locale the Locale for which we want the layout direction. Can be null.
     * @return the layout direction. This may be one of:
     * {@link android.view.View#LAYOUT_DIRECTION_LTR} or
     * {@link android.view.View#LAYOUT_DIRECTION_RTL}.
     *
     * Be careful: this code will need to be updated when vertical scripts will be supported
     */
public static int getLayoutDirectionFromLocale(Locale locale) {
    return ((locale != null && !locale.equals(Locale.ROOT) && ULocale.forLocale(locale).isRightToLeft()) || // If forcing into RTL layout mode, return RTL as default
    SystemProperties.getBoolean(Settings.Global.DEVELOPMENT_FORCE_RTL, false)) ? View.LAYOUT_DIRECTION_RTL : View.LAYOUT_DIRECTION_LTR;
}

/**
     * Return the layout direction for a given Locale
     *
     * @param locale the Locale for which we want the layout direction. Can be null.
     * @return the layout direction. This may be one of:
     * {@link android.view.View#LAYOUT_DIRECTION_LTR} or
     * {@link android.view.View#LAYOUT_DIRECTION_RTL}.
     *
     * Be careful: this code will need to be updated when vertical scripts will be supported
     */
public static int getLayoutDirectionFromLocale(Locale locale) {
    if (locale != null && !locale.equals(Locale.ROOT)) {
        final String scriptSubtag = ICU.addLikelySubtags(locale).getScript();
        if (scriptSubtag == null)
            return getLayoutDirectionFromFirstChar(locale);
        if (scriptSubtag.equalsIgnoreCase(ARAB_SCRIPT_SUBTAG) || scriptSubtag.equalsIgnoreCase(HEBR_SCRIPT_SUBTAG)) {
            return View.LAYOUT_DIRECTION_RTL;
        }
    }
    // If forcing into RTL layout mode, return RTL as default, else LTR
    return SystemProperties.getBoolean(Settings.Global.DEVELOPMENT_FORCE_RTL, false) ? View.LAYOUT_DIRECTION_RTL : View.LAYOUT_DIRECTION_LTR;
}

/**
     * Return the layout direction for a given Locale
     *
     * @param locale the Locale for which we want the layout direction. Can be null.
     * @return the layout direction. This may be one of:
     * {@link android.view.View#LAYOUT_DIRECTION_LTR} or
     * {@link android.view.View#LAYOUT_DIRECTION_RTL}.
     *
     * Be careful: this code will need to be updated when vertical scripts will be supported
     */
public static int getLayoutDirectionFromLocale(Locale locale) {
    if (locale != null && !locale.equals(Locale.ROOT)) {
        final String scriptSubtag = ICU.getScript(ICU.addLikelySubtags(locale.toString()));
        if (scriptSubtag == null)
            return getLayoutDirectionFromFirstChar(locale);
        if (scriptSubtag.equalsIgnoreCase(ARAB_SCRIPT_SUBTAG) || scriptSubtag.equalsIgnoreCase(HEBR_SCRIPT_SUBTAG)) {
            return View.LAYOUT_DIRECTION_RTL;
        }
    }
    return View.LAYOUT_DIRECTION_LTR;
}

@TargetApi(JELLY_BEAN_MR1)
public static String layoutDirectionToString(@ViewLayoutDirection int direction) {
    return buildNamedValueString(direction).value(LAYOUT_DIRECTION_RTL, "right_to_left").value(LAYOUT_DIRECTION_LTR, "left_to_right").value(LAYOUT_DIRECTION_INHERIT, "inherit").value(LAYOUT_DIRECTION_LOCALE, "locale").get();
}