Android(安卓)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() {            @Override            public 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 {        @Override        public 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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