/* * The MIT License (MIT) * * Copyright (c) 2015 malin * * Permission is hereby granted, free of charge, to any person obtaining a copy * of this software and associated documentation files (the "Software"), to deal * in the Software without restriction, including without limitation the rights * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell * copies of the Software, and to permit persons to whom the Software is * furnished to do so, subject to the following conditions: * * The above copyright notice and this permission notice shall be included in all * copies or substantial portions of the Software. * * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE * SOFTWARE. */ package com.malin.rxjava.utils; import android.annotation.SuppressLint; import android.annotation.TargetApi; import android.content.Context; import android.content.res.AssetManager; import android.graphics.Bitmap; import android.graphics.BitmapFactory; import android.os.Build; import java.io.File; import java.io.IOException; import java.io.InputStream; import java.util.ArrayList; /** * 类描述:图片处理类 * 创建人:[email protected] * 创建时间:15-11-11. * 参考项目: */ public class ImageUtils { private static final String TAG = "PaoWuXian_RxJava"; private ImageUtils() { } /** * 从assets文件夹中获取制定路径的图片的Bitmap * * @param context:上下文 * @param imagePathName:图片路径的名称:例如: paowuxian/04.jpg * @param reqWidth:图片需要显示的宽 * @param reqHeight:图片需要显示的高 * @return */ public static Bitmap getImageBitmapFromAssetsFolderThroughImagePathName(Context context, String imagePathName, int reqWidth, int reqHeight) { BitmapFactory.Options opts = new BitmapFactory.Options(); opts.inJustDecodeBounds = true; Bitmap bitmap = null; AssetManager assetManager = context.getResources().getAssets(); InputStream inputStream; try { inputStream = assetManager.open(imagePathName); inputStream.mark(Integer.MAX_VALUE); } catch (IOException e) { e.printStackTrace(); return null; }catch (OutOfMemoryError e) { e.printStackTrace(); System.gc(); return null; } try { if (inputStream != null) { BitmapFactory.decodeStream(inputStream, null, opts); inputStream.reset(); } else { return null; } } catch (OutOfMemoryError e) { e.printStackTrace(); System.gc(); return null; } catch (Exception e) { e.printStackTrace(); return null; } opts.inSampleSize = calculateInSampleSiez(opts, reqWidth, reqHeight); // Log.d(TAG,""+opts.inSampleSize); opts.inJustDecodeBounds = false; opts.inPreferredConfig = Bitmap.Config.RGB_565; opts.inPurgeable = true; opts.inInputShareable = true; opts.inDither = false; opts.inTempStorage = new byte[512 * 1024]; try { if (inputStream != null) { bitmap = BitmapFactory.decodeStream(inputStream, null, opts); } else { return null; } } catch (OutOfMemoryError e) { e.printStackTrace(); System.gc(); return null; } catch (Exception e) { e.printStackTrace(); return null; } finally { if (inputStream != null) { try { inputStream.close(); } catch (Exception e) { e.printStackTrace(); return null; } } } // Log.d(TAG,"w:"+bitmap.getWidth()+" h:"+bitmap.getHeight()); if (bitmap != null) { try { bitmap = Bitmap.createScaledBitmap(bitmap, reqWidth, reqHeight, true); }catch (OutOfMemoryError outOfMemoryError){ outOfMemoryError.printStackTrace(); System.gc(); return null; } } return bitmap; } /** * 获取一个合适的缩放系数(2^n) * * @param options:Options * @param reqWidth:图片需要显示的宽 * @param reqHeight:图片需要显示的高 * @return 缩放系数, 2的次方 * @Link http://hukai.me/android-training-course-in-chinese/graphics/displaying-bitmaps/load-bitmap.html */ public static int calculateInSampleSiez(BitmapFactory.Options options, int reqWidth, int reqHeight) { // Raw height and width of image final int height = options.outHeight; final int width = options.outWidth; int inSampleSize = 1; if (height > reqHeight || width > reqWidth) { final int halfHeight = height / 2; final int halfWidth = width / 2; // Calculate the largest inSampleSize value that is a power of 2 and keeps both // height and width larger than the requested height and width. while ((halfHeight / inSampleSize) > reqHeight && (halfWidth / inSampleSize) > reqWidth) { inSampleSize *= 2; } } return inSampleSize; } /** * 获取assets文件夹下某个文件夹中所有图片路径的集合 * <p/> * 例如:assets/paowuxian 这个目录下的图片路径的集合 * { * paowuxian/04.jpg, * paowuxian/05.jpg, * paowuxian/06.jpg, * paowuxian/07.jpg, * <p/> * } * * @param context:上下文 * @param folderName:文件夹名称 * @return */ public static ArrayList<String> getAssetsImageNamePathList(Context context, String folderName) { ArrayList<String> imagePathList = new ArrayList<>(); String[] imageNameArray = getAssetsImageNameArray(context, folderName); if (imageNameArray != null && imageNameArray.length > 0 && folderName != null && !folderName.replaceAll(" ", "").trim().equals("")) { for (String imageName : imageNameArray) { imagePathList.add(new StringBuffer(folderName).append(File.separator).append(imageName).toString()); } } return imagePathList; } /** * 得到assets文件夹下--某个文件夹下--所有文件的文件名 * 例如:assets/paowuxian 这个目录下的图片名称(包含后缀)集合 * { * 04.jpg, * 05.jpg, * 06.jpg, * 07.jpg, * } * * @param context:上下文 * @param folderName:文件夹名称 * @return */ private static String[] getAssetsImageNameArray(Context context, String folderName) { String[] imageNameArray = null; try { imageNameArray = context.getAssets().list(folderName); } catch (IOException e) { e.printStackTrace(); } return imageNameArray; } /** * 将本地ResFolder图片转换为Bitmap */ /** * inDensity 就是原始资源的 density * * inTargetDensity 就是屏幕的 density。 */ public static Bitmap getLocalBitmapFromResFolder(Context context, int resId) { return BitmapFactory.decodeResource(context.getResources(), resId); } /** * 获取Bitmap大小 * @param bitmap * @return */ @TargetApi(Build.VERSION_CODES.HONEYCOMB_MR1) public static int getBitmapSize2(Bitmap bitmap) { if (bitmap==null) return 0; if (Build.VERSION.SDK_INT < Build.VERSION_CODES.HONEYCOMB_MR1) { return bitmap.getRowBytes() * bitmap.getHeight(); } else { return bitmap.getByteCount(); } } /** * 获取Bitmap大小 * @param bitmap * @return */ @SuppressLint("NewApi") public static int getBitmapSize(Bitmap bitmap) { if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.KITKAT) { // API 19 return bitmap.getAllocationByteCount(); } if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.HONEYCOMB_MR1) {// API 12 return bitmap.getByteCount(); } return bitmap.getRowBytes() * bitmap.getHeight(); // earlier version } }