android之清理缓存实现，供大家参考，具体内容如下
一. 清理缓存首先要搞清楚清理哪些东西
1、app本身的功能比如录像,录音,更新都会产生文件,需要清理2、app的默认缓存地址cache
二. 搞清楚要清理的文件夹位置
1、首先app自身的功能就要看自己把它放在了什么位置2、默认缓存地址:getActivity().getExternalCacheDir();这个位置是在storage/emulated/0/Android/data/com.xxxxxapp/cache
三.代码功能模块:
1、获取app缓存大小,以字节为单位2、获取某个文件夹的大小,以字节为单位3、把字节单位换算成常用单位4、把缓存大小设置到页面,清理前一次,清理后一次5、删除文件夹功能6、清除app缓存
/** * 获取app的缓存大小 * 1. 录制的视频/storage/emulated/0/xueliangapp/video/1573972925136.mp4 * 2. 录制的音频/storage/emulated/0/xueliangapp/radio/1573972925136.amr * 3. 下载的更新包/storage/emulated/0/Android/data/com.sdxzt.xueliangapp_v3/files/Download/xueliang_update.apk * 4. 缓存/storage/emulated/0/Android/data/com.sdxzt.xueliangapp_v3/cache*/ File videoDir,radioDir,filesDir,cacheDir; private String getAppCache(){ long fileSize = 0; String cacheSize = "0KB"; videoDir = new File(Environment.getExternalStorageDirectory()+"/xueliangapp/video"); Log.d(TAG, "getAppCache: videoDir大小: "+getDirSize(videoDir)); radioDir = new File(Environment.getExternalStorageDirectory()+"/xueliangapp/radio"); Log.d(TAG, "getAppCache: radioDir大小: "+getDirSize(radioDir)); filesDir = getActivity().getExternalFilesDir(Environment.DIRECTORY_DOWNLOADS); Log.d(TAG, "getAppCache: filesDir大小: "+getDirSize(filesDir)); ///storage/emulated/0/Android/data/com.sdxzt.xueliangapp_v3/files,这里面有download文件夹,里面是下载的更新包 cacheDir = getActivity().getExternalCacheDir(); Log.d(TAG, "getAppCache: cacheDir大小: "+getDirSize(cacheDir)); ///storage/emulated/0/Android/data/com.sdxzt.xueliangapp_v3/cache fileSize += getDirSize(getActivity().getFilesDir()); fileSize += getDirSize(getActivity().getCacheDir());//这行是默认的缓存地址,看图片什么的会在这里积累缓存 fileSize += getDirSize(videoDir); fileSize += getDirSize(radioDir); fileSize += getDirSize(filesDir); fileSize += getDirSize(cacheDir); String fileSizeStr = formatFileSize(fileSize); Log.d(TAG, "getAppCache: 总缓存大小: "+fileSizeStr); return fileSizeStr; } /** * 获取文件大小(字节为单位) * @param dir * @return */ private long getDirSize(File dir) { if (dir == null) { return 0; } if (!dir.isDirectory()) { return 0; } long dirSize = 0; File[] files = dir.listFiles(); for (File file : files) { if (file.isFile()) { dirSize += file.length();//文件的长度就是文件的大小 } else if (file.isDirectory()) { dirSize += file.length(); dirSize += getDirSize(file); // 递归调用继续统计 } } return dirSize; } /** * 格式化文件长度 * @param fileSize * @return */ private String formatFileSize(long fileSize){ DecimalFormat df = new DecimalFormat("#0.00");//表示小数点前至少一位,0也会显示,后保留两位 String fileSizeString = ""; if (fileSize < 1024) { fileSizeString = df.format((double) fileSize) + "B"; } else if (fileSize < 1048576) { fileSizeString = df.format((double) fileSize / 1024) + "KB"; } else if (fileSize < 1073741824) { fileSizeString = df.format((double) fileSize / 1048576) + "MB"; } else { fileSizeString = df.format((double) fileSize / 1073741824) + "G"; } return fileSizeString; } private void setAppCache() { String fileSize = getAppCache(); fileSizeTv.setText(fileSize); Log.d(TAG, "setAppCache: 重新显示缓存大小"); Log.d(TAG, "setAppCache: 当前缓存"+fileSize); } public void clearAppCache(final Activity activity){ final Handler handler = new Handler(){ @Override public void handleMessage(@NonNull Message msg) { super.handleMessage(msg); Log.d(TAG, "handlerMessage: "); if (msg.what == 1) { setAppCache(); Log.d(TAG, "handlerMessage: 缓存清除完毕"); ToastUtil.showMsg(getActivity(),"缓存清除完毕"); }else { ToastUtil.showMsg(getActivity(),"缓存清除失败"); Log.d(TAG, "handlerMessage: 缓存清除失败"); } } }; new Thread(new Runnable() { @Override public void run() { Log.d(TAG, "run: "); Message msg = new Message(); try { clearCacheFolder(videoDir,System.currentTimeMillis()); clearCacheFolder(radioDir,System.currentTimeMillis()); clearCacheFolder(filesDir,System.currentTimeMillis()); clearCacheFolder(cacheDir,System.currentTimeMillis()); msg.what = 1; }catch (Exception e){ e.printStackTrace(); msg.what = -1; } handler.sendMessage(msg); } }).start(); } /** * 清除缓存目录 * @param dir 目录 * @param curTime 当前系统时间 */ private int clearCacheFolder(File dir,long curTime){ int deletedFiles = 0; if (dir!= null && dir.isDirectory()) { try { for (File child:dir.listFiles()) { if (child.isDirectory()) { deletedFiles += clearCacheFolder(child, curTime); } if (child.lastModified() < curTime) { if (child.delete()) { deletedFiles++; } } } } catch(Exception e) { e.printStackTrace(); } } Log.d(TAG, "clearCacheFolder: 清除目录: "+dir.getAbsolutePath()); return deletedFiles; }
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