Java tutorial
/* * Copyright (C) 2016 Thomas Robert Altstidl * * 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.tr4android.support.extension.picker; import android.content.Context; import android.content.res.ColorStateList; import android.content.res.TypedArray; import android.graphics.drawable.ColorDrawable; import android.graphics.drawable.Drawable; import android.graphics.drawable.GradientDrawable; import android.graphics.drawable.ShapeDrawable; import android.os.Build; import android.support.annotation.ColorInt; import android.support.v4.content.ContextCompat; import android.support.v4.graphics.ColorUtils; import android.support.v4.graphics.drawable.DrawableCompat; import android.support.v7.widget.AppCompatDrawableManager; import android.util.TypedValue; import android.widget.ImageButton; import com.tr4android.appcompat.extension.R; import com.tr4android.support.extension.utils.ThemeUtils; /** * Since Android versions prior to Lollipop don't support references in color resources * (e.g. `?attr/colorAccent`) theming must be done at runtime. * <p/> * This helper class has methods to easily create all the ColorStateLists needed for * the AppCompatDatePickerDialog and the AppCompatTimePickerDialog. */ public class PickerThemeUtils { public static ColorStateList getHeaderTextColorStateList(Context context) { return new ColorStateList(new int[][] { // states new int[] { android.R.attr.state_selected }, new int[] {} // state_default }, new int[] { // colors ContextCompat.getColor(context, R.color.abc_primary_text_material_dark), ContextCompat.getColor(context, R.color.abc_secondary_text_material_dark) }); } public static Drawable getHeaderBackground(Context context, @ColorInt int color) { if (Build.VERSION.SDK_INT < Build.VERSION_CODES.LOLLIPOP) { // Create a background drawable with 2dp corners GradientDrawable drawable = (GradientDrawable) ContextCompat.getDrawable(context, R.drawable.picker_header_background); drawable.setColor(color); return drawable; } else { return new ColorDrawable(color); } } public static ColorStateList getTextColorPrimaryActivatedStateList(Context context) { final float disabledAlpha = getDisabledAlpha(context); final int textColor = ThemeUtils.getThemeAttrColor(context, android.R.attr.textColorPrimary); final int textColorActivated = ContextCompat.getColor(context, R.color.abc_primary_text_material_dark); return new ColorStateList(new int[][] { // states new int[] { -android.R.attr.state_enabled, android.R.attr.state_selected }, new int[] { -android.R.attr.state_enabled }, new int[] { android.R.attr.state_selected }, new int[] {} // state_default }, new int[] { // colors setAlphaComponent(textColorActivated, disabledAlpha), setAlphaComponent(textColor, disabledAlpha), textColorActivated, textColor }); } public static ColorStateList getTextColorSecondaryActivatedStateList(Context context) { final float disabledAlpha = getDisabledAlpha(context); final int textColor = ThemeUtils.getThemeAttrColor(context, android.R.attr.textColorSecondary); final int textColorActivated = ContextCompat.getColor(context, R.color.abc_secondary_text_material_dark); return new ColorStateList(new int[][] { // states new int[] { -android.R.attr.state_enabled, android.R.attr.state_selected }, new int[] { -android.R.attr.state_enabled }, new int[] { android.R.attr.state_selected }, new int[] {} // state_default }, new int[] { // colors setAlphaComponent(textColorActivated, disabledAlpha), setAlphaComponent(textColor, disabledAlpha), textColorActivated, textColor }); } public static float getDisabledAlpha(Context context) { final TypedValue outValue = new TypedValue(); context.getTheme().resolveAttribute(android.R.attr.disabledAlpha, outValue, true); return outValue.getFloat(); } public static int setAlphaComponent(int color, float alpha) { final int srcRgb = color & 0xFFFFFF; final int srcAlpha = (color >> 24) & 0xFF; final int dstAlpha = (int) (srcAlpha * alpha + 0.5f); return srcRgb | (dstAlpha << 24); } public static ColorStateList getNavButtonColorStateList(Context context) { return new ColorStateList(new int[][] { // states new int[] { android.R.attr.state_pressed }, new int[] { android.R.attr.state_focused }, new int[] {} // state_default }, new int[] { //colors ThemeUtils.getThemeAttrColor(context, R.attr.colorControlHighlight), ThemeUtils.getThemeAttrColor(context, R.attr.colorControlHighlight), ContextCompat.getColor(context, android.R.color.transparent) }); } public static Drawable getNavButtonBackground(Context context) { Drawable drawable = ContextCompat.getDrawable(context, R.drawable.date_picker_nav_background); if (Build.VERSION.SDK_INT < Build.VERSION_CODES.LOLLIPOP) { // Proxy the highlight color into the background drawable drawable = DrawableCompat.wrap(drawable.mutate()); DrawableCompat.setTintList(drawable, getNavButtonColorStateList(context)); } return drawable; } public static void setNavButtonDrawable(Context context, ImageButton left, ImageButton right, int monthTextAppearanceResId) { // Retrieve the previous and next drawables AppCompatDrawableManager dm = AppCompatDrawableManager.get(); Drawable prevDrawable = dm.getDrawable(context, R.drawable.ic_chevron_left_black_24dp); Drawable nextDrawable = dm.getDrawable(context, R.drawable.ic_chevron_right_black_24dp); // Proxy the month text color into the previous and next drawables. final TypedArray ta = context.obtainStyledAttributes(null, new int[] { android.R.attr.textColor }, 0, monthTextAppearanceResId); final ColorStateList monthColor = ta.getColorStateList(0); if (monthColor != null) { DrawableCompat.setTint(DrawableCompat.wrap(prevDrawable), monthColor.getDefaultColor()); DrawableCompat.setTint(DrawableCompat.wrap(nextDrawable), monthColor.getDefaultColor()); } ta.recycle(); // Set the previous and next drawables left.setImageDrawable(prevDrawable); right.setImageDrawable(nextDrawable); } }