Android工具类篇 清理APP应用缓存

public class DateclearManager {
    
    

    /** * 清除本应用内部缓存(/data/data/com.xxx.xxx/cache) * * @param context */
    public static void cleanInternalCache(Context context) {
    
    
        deleteFilesByDirectory(context.getCacheDir());
    }

    /** * 清除本应用所有数据库(/data/data/com.xxx.xxx/databases) * * @param context */
    public static void cleanDatabases(Context context) {
    
    
        deleteFilesByDirectory(new File("/data/data/"
                + context.getPackageName() + "/databases"));
    }

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

    /** * 按名字清除本应用数据库 * * @param context * @param dbName */
    public static void cleanDatabaseByName(Context context, String dbName) {
    
    
        context.deleteDatabase(dbName);
    }

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

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

    /** * 清除自定义路径下的文件，使用需小心，请不要误删。而且只支持目录下的文件删除 * * @param filePath */
    public static void cleanCustomCache(String filePath) {
    
    
        deleteFilesByDirectory(new File(filePath));
    }

    /** * 清除本应用所有的数据 * * @param context * @param filepath */
    public static void cleanApplicationData(Context context, String... filepath) {
    
    
        cleanInternalCache(context);
        cleanExternalCache(context);
        cleanDatabases(context);
        cleanSharedPreference(context);
        cleanFiles(context);
        for (String filePath : filepath) {
    
    
            cleanCustomCache(filePath);
        }
    }

    /**
     *删除方法 这里只会删除某个文件夹下的文件，如果传入的directory是个文件，将不做处理
     *  @param directory
     */
    private static void deleteFilesByDirectory(File directory) {
    
    
        if (directory != null && directory.exists() && directory.isDirectory()) {
    
    
            for (File item : directory.listFiles()) {
    
    
                item.delete();
            }
        }
    }


    /**
     * 获得所有缓存数据的大小
     * @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);
    }

    //清空缓存
    public static void clearAllCache(Context context) {
    
    
        deleteDir(context.getCacheDir());
        if (Environment.getExternalStorageState().equals(Environment.MEDIA_MOUNTED)) {
    
    
            deleteDir(context.getExternalCacheDir());
        }
    }

    //删除文件
    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();
    }

    // 获取文件大小
    //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
    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;
    }

    /**
     * 格式化文件的单位  转化文件单位
     * @param size
     * @return
     */
    public static String getFormatSize(double size) {
    
    
        double kiloByte = size / 1024;
        if (kiloByte < 1) {
    
    
//            return size + "Byte";
            return "0K";
        }

        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";
    }

}