主要功能有清除內/外快取，清除資料庫，清除sharedPreference，清除files和清除自定義目錄，主要程式碼如下：

import android.content.Context;
import android.os.Environment;
import android.text.TextUtils;
import java.io.File;
import java.math.BigDecimal;
/**
 * @author :huangxianfeng on 2016/6/30.
 *本應用資料清除管理器
 * 主要功能有清除內/外快取，清除資料庫，清除sharedPreference，清除files和清除自定義目錄
*/
 

public class DataCleanManager {

    private static DataCleanManager instance;

    private DataCleanManager(){};

    public static DataCleanManager getInstance(){
        if(instance == null){
            synchronized (DataCleanManager.class){
                if (instance == null){
                    instance = new
 
 DataCleanManager();
                }
            }
        }
        return instance;
    }

    /**獲取快取的大小*/
    public String getTotalCacheSize(Context context) throws Exception {
        long iconPathSize = getFolderSize(new File(SDCardUtil.getInstance().getIconPath()));
        long loadPicPathSize = getFolderSize(new
 
 File(SDCardUtil.getInstance().getUploadPicPath()));
        long cacheSize = getFolderSize(context.getCacheDir());
        long deBugSize = getFolderSize(new File(SDCardUtil.getInstance().getDebugPath()));
        long downloadPath = getFolderSize(new File(SDCardUtil.getInstance().getDownloadPath()));
        if (Environment.getExternalStorageState().equals(Environment.MEDIA_MOUNTED)) {
            cacheSize += getFolderSize(context.getExternalCacheDir());
        }
        System.out.println("CacheSize...iconPathSize="+iconPathSize);
        System.out.println("CacheSize...loadPicPathSize="+loadPicPathSize);
        System.out.println("CacheSize...cacheSize="+cacheSize);
        System.out.println("CacheSize...deBugSize="+deBugSize);
        System.out.println("CacheSize...downloadPath="+downloadPath);
        System.out.println("----------------------------------");
        return getFormatSize(cacheSize + deBugSize + iconPathSize + loadPicPathSize+downloadPath);
    }

    /**清除快取*/
    public void clearAllCache(Context context) {
        //在此地方進行清除
//        BitmapUtil.getInstance().getBitmapUtils().clearMemoryCache();
//        BitmapUtil.getInstance().getBitmapUtils().clearCache();
//        BitmapUtil.getInstance().getBitmapUtils().clearDiskCache();
        CommentDao.getInstance().clearAll();
        NoticeDao.getInstance().clearAll();
        CivistateDao.getInstance().clearAll();
        UserCommentListDao.getInstance().clearData();
        deleteFilesByDirectory(new File(SDCardUtil.getInstance().getUploadPicPath()));//清除拍照留下的剪下原圖
        deleteFilesByDirectory(new File(SDCardUtil.getInstance().getIconPath()));
        deleteFilesByDirectory(new File(SDCardUtil.getInstance().getDownloadPath()));
        deleteDir(context.getCacheDir());
        deleteDir(new File(SDCardUtil.getInstance().getDebugPath()));
        if (Environment.getExternalStorageState().equals(Environment.MEDIA_MOUNTED)) {
            deleteDir(context.getExternalCacheDir());
        }
    }

    private 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]));
                System.out.println("success" + success + "; = " + dir.getAbsolutePath() + File.separator + children[i]);
                if (!success) {
                    return false;
                }
            }
        }
        return dir.delete();
    }

    /**
     * * 清除本應用內部快取(/data/data/com.xxx.xxx/cache) * *
     * @param context
     */
    public void cleanInternalCache(Context context){
        deleteFilesByDirectory(context.getCacheDir());
    }

    /**
     * * 清除本應用所有資料庫(/data/data/com.xxx.xxx/databases) * *
     * @param context
     */
    public void cleanDatabases(Context context) {
        deleteFilesByDirectory(new File("/data/data/"
                + context.getPackageName() + "/databases"));
    }

    /**
     * * 清除本應用SharedPreference(/data/data/com.xxx.xxx/shared_prefs) *
     * @param context
     */
    public void cleanSharedPreference(Context context) {
        deleteFilesByDirectory(new File("/data/data/"
                + context.getPackageName() + "/shared_prefs"));
    }

    /**
     * * 按名字清除本應用資料庫 * *
     *
     * @param context
     * @param dbName
     */
    public void cleanDatabaseByName(Context context, String dbName) {
        context.deleteDatabase(dbName);
    }

    /**
     * * 清除/data/data/com.xxx.xxx/files下的內容 * *
     * @param context
     */
    public void cleanFiles(Context context) {
        deleteFilesByDirectory(context.getFilesDir());
    }


    /**
     * * 清除外部cache下的內容(/mnt/sdcard/android/data/com.xxx.xxx/cache)
     * @param context
     */
    public void cleanExternalCache(Context context) {
        if (Environment.getExternalStorageState().equals(
                Environment.MEDIA_MOUNTED)) {
            deleteFilesByDirectory(context.getExternalCacheDir());
        }
    }

    /**
     * * 清除自定義路徑下的檔案，使用需小心，請不要誤刪。而且只支援目錄下的檔案刪除 * *
     * @param filePath
     * */
    public void cleanCustomCache(String filePath) {
        deleteFilesByDirectory(new File(filePath));
    }

    /**
     * * 清除本應用所有的資料 * *
     * @param context
     * @param filepath
     */
    public void cleanApplicationData(Context context, String... filepath) {
        cleanInternalCache(context);
        cleanExternalCache(context);
        cleanDatabases(context);
        cleanSharedPreference(context);
        cleanFiles(context);
        if (filepath == null) {
            return;
        }
        for (String filePath : filepath) {
            cleanCustomCache(filePath);
        }
    }

    /**
     * * 刪除方法 這裡只會刪除某個資料夾下的檔案，如果傳入的directory是個檔案，將不做處理 * *
     * @param directory
     */
    private void deleteFilesByDirectory(File directory) {
        if (directory != null && directory.exists() && directory.isDirectory()){
            for (File item : directory.listFiles()) {
                item.delete();
            }
        }
    }


    // 獲取檔案
    //Context.getExternalFilesDir() --> SDCard/Android/data/你的應用的包名/files/ 目錄，一般放一些長時間儲存的資料
    //Context.getExternalCacheDir() --> SDCard/Android/data/你的應用包名/cache/目錄，一般存放臨時快取資料
    public long getFolderSize(File file) throws Exception {
        long size = 0;
        try {
            File[] fileList = file.listFiles();
            for (int i = 0; i < fileList.length; i++) {
                // 如果下面還有檔案
                if (fileList[i].isDirectory()) {
                    size = size + getFolderSize(fileList[i]);
                } else {
                    size = size + fileList[i].length();
                }
            }
        } catch (Exception e) {
            e.printStackTrace();
        }
        return size;
    }

    /**
     * 刪除指定目錄下檔案及目錄
     *
     * @param deleteThisPath
     * @param filepath
     * @return
     */
    public void deleteFolderFile(String filePath, boolean deleteThisPath) {
        if (!TextUtils.isEmpty(filePath)) {
            try {
                File file = new File(filePath);
                if (file.isDirectory()) {// 如果下面還有檔案
                    File files[] = file.listFiles();
                    for (int i = 0; i < files.length; i++) {
                        deleteFolderFile(files[i].getAbsolutePath(), true);
                    }
                }
                if (deleteThisPath) {
                    if (!file.isDirectory()) {// 如果是檔案，刪除
                        file.delete();
                    } else {// 目錄
                        if (file.listFiles().length == 0) {// 目錄下沒有檔案或者目錄，刪除
                            file.delete();
                        }
                    }
                }
            } catch (Exception e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            }
        }
    }

    /**
     * 格式化單位
     *
     * @param size
     * @return
     */
    public String getFormatSize(double size) {
        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";
    }


    public String getCacheSize(File file) throws Exception {
        return getFormatSize(getFolderSize(file));
    }

}

可以根據自己具體情況實現自己的快取清除，有更好的方法，可以留言交流。