Android 清理缓存、优化内存空间

有时候项目中需要清理一些缓存数据（如：图片缓存、网络数据缓存等），当然也要对SharedPreferences存储的数据进行清理，当然App中有个这样的功能可能会提高逼格吧。

public class CacheDataManager {/*** 获取整体缓存大小* @param context* @return* @throws Exception*/public static String getTotalCacheSize(Context context) throws Exception {long cacheSize = getFolderSize(context.getCacheDir());if (Environment.getExternalStorageState().equals(Environment.MEDIA_MOUNTED)) {cacheSize += getFolderSize(context.getExternalCacheDir());}return getFormatSize(cacheSize);}/*** 获取文件* Context.getExternalFilesDir() --> SDCard/Android/data/你的应用的包名/files/ 目录，一般放一些长时间保存的数据* Context.getExternalCacheDir() --> SDCard/Android/data/你的应用包名/cache/目录，一般存放临时缓存数据* @param file* @return* @throws Exception*/public static long getFolderSize(File file) throws Exception {long size = 0;try {File[] fileList = file.listFiles();for (int i = 0; i < fileList.length; i++) {// 如果下面还有文件if (fileList[i].isDirectory()) {size = size + getFolderSize(fileList[i]);} else {size = size + fileList[i].length();}}} catch (Exception e) {e.printStackTrace();}return size;}/*** 格式化单位* @param size*/public static String getFormatSize(long size) {long kb = size / 1024;int m = (int) (kb / 1024);int kbs = (int) (kb % 1024);return m + "." + kbs + "M";
//        double kiloByte = size / 1024;
//        if (kiloByte < 1) {
//            return size + "Byte";
//        }
//        double megaByte = kiloByte / 1024;
//        if (megaByte < 1) {
//            BigDecimal result1 = new BigDecimal(Double.toString(kiloByte));
//            return result1.setScale(2, BigDecimal.ROUND_HALF_UP).toPlainString() + "KB";
//        }
//        double gigaByte = megaByte / 1024;
//        if (gigaByte < 1) {
//            BigDecimal result2 = new BigDecimal(Double.toString(megaByte));
//            return result2.setScale(2, BigDecimal.ROUND_HALF_UP).toPlainString() + "MB";
//        }
//        double teraBytes = gigaByte / 1024;
//        if (teraBytes < 1) {
//            BigDecimal result3 = new BigDecimal(Double.toString(gigaByte));
//            return result3.setScale(2, BigDecimal.ROUND_HALF_UP).toPlainString() + "GB";
//        }
//        BigDecimal result4 = new BigDecimal(teraBytes);
//        return result4.setScale(2, BigDecimal.ROUND_HALF_UP).toPlainString() + "TB";}/*** 清空方法* @param context*/public static void clearAllCache(Context context) {deleteDir(context.getCacheDir());if (Environment.getExternalStorageState().equals(Environment.MEDIA_MOUNTED)) {deleteDir(context.getExternalCacheDir());}}private static boolean deleteDir(File dir) {if (dir != null && dir.isDirectory()) {String[] children = dir.list();for (int i = 0; i < children.length; i++) {boolean success = deleteDir(new File(dir, children[i]));if (!success) {return false;}}}return dir.delete();}}

直接调用：

 CacheDataManager.clearAllCache(SettingActivity.this);

 其实它的清理速度是非常快的，那么做一个延时效果会让用户有一点点体验的：

    @OnClick(R.id.setting_cleancache)void clean() {//设置默认的等待效果mDlg = new WaitingDlg(SettingActivity.this, "", "", true);PromptDialog dialog = new PromptDialog(SettingActivity.this, R.string.prompt, R.string.cleancache_title);dialog.showYesNo(new DialogInterface.OnClickListener() {@Overridepublic void onClick(DialogInterface dialog, int which) {SPUtils.clear();mDlg.start();new Thread(new clearCache()).start();dialog.dismiss();}});}private Handler handler = new Handler() {public void handleMessage(android.os.Message msg) {switch (msg.what) {case 0:mDlg.dismiss();Toast.makeText(SettingActivity.this, "清理完成", Toast.LENGTH_SHORT).show();try {cachetext.setText(CacheDataManager.getTotalCacheSize(SettingActivity.this));} catch (Exception e) {e.printStackTrace();}}}};class clearCache implements Runnable {@Overridepublic void run() {try {CacheDataManager.clearAllCache(SettingActivity.this);Thread.sleep(1000);if (CacheDataManager.getTotalCacheSize(SettingActivity.this).startsWith("0")) {handler.sendEmptyMessage(0);}} catch (Exception e) {return;}}}

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