packages/SystemUI/src/com/android/systemui/FontSizeUtils.java

/*
 * Copyright (C) 2014 The Android Open Source Project
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License
 */

package com.android.systemui;

import android.annotation.StyleRes;
import android.content.res.TypedArray;
import android.util.TypedValue;
import android.view.View;
import android.widget.TextView;

/**
 * Utility class to update the font size when the configuration has changed.
 */
public final class FontSizeUtils {

    private FontSizeUtils() {}

    public static void updateFontSize(View parent, int viewId, int dimensId) {
        updateFontSize((TextView) parent.findViewById(viewId), dimensId);
    }

    public static void updateFontSize(TextView v, int dimensId) {
        if (v != null) {
            v.setTextSize(TypedValue.COMPLEX_UNIT_PX,
                    v.getResources().getDimensionPixelSize(dimensId));
        }
    }

    /**
     * Updates the font size according to the style given.
     *
     * @param v     Text to update.
     * @param resId Style applying to the text.
     */
    public static void updateFontSizeFromStyle(TextView v, @StyleRes int resId) {
        int[] attrs = {android.R.attr.textSize};
        int indexOfAttrTextSize = 0;
        TypedArray ta = v.getContext().obtainStyledAttributes(resId, attrs);
        int updatedTextPixelSize = ta.getDimensionPixelSize(indexOfAttrTextSize,
                (int) v.getTextSize());
        v.setTextSize(TypedValue.COMPLEX_UNIT_PX, updatedTextPixelSize);
        ta.recycle();
    }
}