package com.ljz.base.common.diskcache; import android.content.Context; import android.content.pm.PackageInfo; import android.content.pm.PackageManager; import android.graphics.Bitmap; import android.graphics.BitmapFactory; import android.graphics.Canvas; import android.graphics.PixelFormat; import android.graphics.drawable.BitmapDrawable; import android.graphics.drawable.Drawable; import java.io.ByteArrayOutputStream; import java.io.Closeable; import java.io.File; import java.io.IOException; import java.io.Reader; import java.io.StringWriter; import java.nio.charset.Charset; import java.security.MessageDigest; import java.security.NoSuchAlgorithmException; public class Utils { static final Charset US_ASCII = Charset.forName("US-ASCII"); static final Charset UTF_8 = Charset.forName("UTF-8"); static String readFully(Reader reader) throws IOException { try { StringWriter writer = new StringWriter(); char[] buffer = new char[1024]; int count; while ((count = reader.read(buffer)) != -1) { writer.write(buffer, 0, count); } return writer.toString(); } finally { reader.close(); } } /** * Deletes the contents of {@code dir}. Throws an IOException if any file * could not be deleted, or if {@code dir} is not a readable directory. */ static void deleteContents(File dir) throws IOException { File[] files = dir.listFiles(); if (files == null) { throw new IOException("not a readable directory: " + dir); } for (File file : files) { if (file.isDirectory()) { deleteContents(file); } if (!file.delete()) { throw new IOException("failed to delete file: " + file); } } } static void closeQuietly(/*Auto*/Closeable closeable) { if (closeable != null) { try { closeable.close(); } catch (RuntimeException rethrown) { throw rethrown; } catch (Exception ignored) { } } } public static int getAppVersion(Context context) { try { PackageInfo info = context.getPackageManager().getPackageInfo(context.getPackageName(), 0); return info.versionCode; } catch (PackageManager.NameNotFoundException e) { e.printStackTrace(); } return 1; } public static String hashKeyForDisk(String key) { String cacheKey; try { final MessageDigest mDigest = MessageDigest.getInstance("MD5"); mDigest.update(key.getBytes()); cacheKey = bytesToHexString(mDigest.digest()); } catch (NoSuchAlgorithmException e) { cacheKey = String.valueOf(key.hashCode()); } return cacheKey; } public static String bytesToHexString(byte[] bytes) { StringBuilder sb = new StringBuilder(); for (int i = 0; i < bytes.length; i++) { String hex = Integer.toHexString(0xFF & bytes[i]); if (hex.length() == 1) { sb.append('0'); } sb.append(hex); } return sb.toString(); } public static byte[] bitmap2Bytes(Bitmap bm) { if (bm == null) { return null; } ByteArrayOutputStream baos = new ByteArrayOutputStream(); bm.compress(Bitmap.CompressFormat.PNG, 100, baos); return baos.toByteArray(); } public static Bitmap bytes2Bitmap(byte[] bytes) { return BitmapFactory.decodeByteArray(bytes, 0, bytes.length); } /** * Drawable → Bitmap */ public static Bitmap drawable2Bitmap(Drawable drawable) { if (drawable == null) { return null; } // 取 drawable 的长宽 int w = drawable.getIntrinsicWidth(); int h = drawable.getIntrinsicHeight(); // 取 drawable 的颜色格式 Bitmap.Config config = drawable.getOpacity() != PixelFormat.OPAQUE ? Bitmap.Config.ARGB_8888 : Bitmap.Config.RGB_565; // 建立对应 bitmap Bitmap bitmap = Bitmap.createBitmap(w, h, config); // 建立对应 bitmap 的画布 Canvas canvas = new Canvas(bitmap); drawable.setBounds(0, 0, w, h); // 把 drawable 内容画到画布中 drawable.draw(canvas); return bitmap; } /* * Bitmap → Drawable */ @SuppressWarnings("deprecation") public static Drawable bitmap2Drawable(Bitmap bm) { if (bm == null) { return null; } BitmapDrawable bd = new BitmapDrawable(bm); bd.setTargetDensity(bm.getDensity()); return new BitmapDrawable(bm); } }