Java tutorial
//package com.java2s; /* * Copyright 2013 Google Inc. * * 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. */ import android.content.Context; import android.content.res.ColorStateList; import android.graphics.Bitmap; import android.graphics.Canvas; import android.graphics.PorterDuff; import android.graphics.drawable.BitmapDrawable; import android.graphics.drawable.ColorDrawable; import android.graphics.drawable.Drawable; import android.graphics.drawable.StateListDrawable; import android.view.View; import android.view.ViewGroup; import android.widget.AnalogClock; import android.widget.ImageView; import android.widget.TextView; import java.lang.reflect.Field; public class Main { public static void traverseAndRecolor(View root, int color, boolean withStates, boolean setClickableItemBackgrounds) { Context context = root.getContext(); if (setClickableItemBackgrounds && root.isClickable()) { StateListDrawable selectableItemBackground = new StateListDrawable(); selectableItemBackground.addState(new int[] { android.R.attr.state_pressed }, new ColorDrawable((color & 0xffffff) | 0x33000000)); selectableItemBackground.addState(new int[] { android.R.attr.state_focused }, new ColorDrawable((color & 0xffffff) | 0x44000000)); selectableItemBackground.addState(new int[] {}, null); root.setBackground(selectableItemBackground); } if (root instanceof ViewGroup) { ViewGroup parent = (ViewGroup) root; for (int i = 0; i < parent.getChildCount(); i++) { traverseAndRecolor(parent.getChildAt(i), color, withStates, setClickableItemBackgrounds); } } else if (root instanceof ImageView) { ImageView imageView = (ImageView) root; Drawable sourceDrawable = imageView.getDrawable(); if (withStates && sourceDrawable != null && sourceDrawable instanceof BitmapDrawable) { imageView.setImageDrawable( makeRecoloredDrawable(context, (BitmapDrawable) sourceDrawable, color, true)); } else { imageView.setColorFilter(color, PorterDuff.Mode.MULTIPLY); } } else if (root instanceof TextView) { TextView textView = (TextView) root; if (withStates) { int sourceColor = textView.getCurrentTextColor(); ColorStateList colorStateList = new ColorStateList( new int[][] { new int[] { android.R.attr.state_pressed }, new int[] { android.R.attr.state_focused }, new int[] {} }, new int[] { sourceColor, sourceColor, color }); textView.setTextColor(colorStateList); } else { textView.setTextColor(color); } } else if (root instanceof AnalogClock) { AnalogClock analogClock = (AnalogClock) root; try { Field hourHandField = AnalogClock.class.getDeclaredField("mHourHand"); hourHandField.setAccessible(true); Field minuteHandField = AnalogClock.class.getDeclaredField("mMinuteHand"); minuteHandField.setAccessible(true); Field dialField = AnalogClock.class.getDeclaredField("mDial"); dialField.setAccessible(true); BitmapDrawable hourHand = (BitmapDrawable) hourHandField.get(analogClock); if (hourHand != null) { Drawable d = makeRecoloredDrawable(context, hourHand, color, withStates); d.setCallback(analogClock); hourHandField.set(analogClock, d); } BitmapDrawable minuteHand = (BitmapDrawable) minuteHandField.get(analogClock); if (minuteHand != null) { Drawable d = makeRecoloredDrawable(context, minuteHand, color, withStates); d.setCallback(analogClock); minuteHandField.set(analogClock, d); } BitmapDrawable dial = (BitmapDrawable) dialField.get(analogClock); if (dial != null) { Drawable d = makeRecoloredDrawable(context, dial, color, withStates); d.setCallback(analogClock); dialField.set(analogClock, d); } } catch (NoSuchFieldException ignored) { } catch (IllegalAccessException ignored) { } catch (ClassCastException ignored) { } // TODO: catch all exceptions? } } public static Drawable makeRecoloredDrawable(Context context, BitmapDrawable drawable, int color, boolean withStates) { Bitmap recoloredBitmap = recolorBitmap(drawable, color); BitmapDrawable recoloredDrawable = new BitmapDrawable(context.getResources(), recoloredBitmap); if (!withStates) { return recoloredDrawable; } StateListDrawable stateDrawable = new StateListDrawable(); stateDrawable.addState(new int[] { android.R.attr.state_pressed }, drawable); stateDrawable.addState(new int[] { android.R.attr.state_focused }, drawable); stateDrawable.addState(new int[] {}, recoloredDrawable); return stateDrawable; } public static Bitmap recolorBitmap(Drawable drawable, int color) { if (drawable == null) { return null; } int width = drawable.getIntrinsicWidth(); int height = drawable.getIntrinsicHeight(); if (width <= 0 || height <= 0) { return Bitmap.createBitmap(1, 1, Bitmap.Config.ARGB_8888); } Bitmap outBitmap = Bitmap.createBitmap(width, height, Bitmap.Config.ARGB_8888); Canvas canvas = new Canvas(outBitmap); drawable.setBounds(0, 0, outBitmap.getWidth(), outBitmap.getHeight()); drawable.setColorFilter(color, PorterDuff.Mode.SRC_IN); drawable.draw(canvas); drawable.setColorFilter(null); drawable.setCallback(null); // free up any references return outBitmap; } }