android 端缓存清理的实现

首先关于缓存清理,网上已经有太多的工具类,但是遗憾的是,基本上都不完善,或者说根本就不能用,而项目中又要求实现这个烂东西(其实这玩意真没一点屁用,毕竟第三方清理/杀毒软件都带这么一个功能),但是只好硬着头皮搞搞.. 随记录如下:

先上图

当点击清理缓存 这个LinearLayout 弹出对话框,

代码如下:

 case R.id.rl_clean_cache://清理缓存
                onClickCleanCache();
                break;

//------****** 缓存相关****----------
    private final int CLEAN_SUC=1001;
    private final int CLEAN_FAIL=1002;
    private void onClickCleanCache() {
        getConfirmDialog(getActivity(), "是否清空缓存?", new DialogInterface.OnClickListener
                () {
            @Override
            public void onClick(DialogInterface dialogInterface, int i) {
                clearAppCache();
                tvCache.setText("0KB");
            }
        }).show();
    }
    public static AlertDialog.Builder getConfirmDialog(Context context, String message, DialogInterface.OnClickListener onClickListener) {
        AlertDialog.Builder builder = getDialog(context);
        builder.setMessage(Html.fromHtml(message));
        builder.setPositiveButton("确定", onClickListener);
        builder.setNegativeButton("取消", null);
        return builder;
    }
    public static AlertDialog.Builder getDialog(Context context) {
        AlertDialog.Builder builder = new AlertDialog.Builder(context);
        return builder;
    }

/**
     * 计算缓存的大小
     */
    private void caculateCacheSize() {
        long fileSize = 0;
        String cacheSize = "0KB";
        File filesDir = getActivity().getFilesDir();
        File cacheDir = getActivity().getCacheDir();

        fileSize += FileUtil.getDirSize(filesDir);
        fileSize += FileUtil.getDirSize(cacheDir);
        // 2.2版本才有将应用缓存转移到sd卡的功能
        if (isMethodsCompat(android.os.Build.VERSION_CODES.FROYO)) {
            File externalCacheDir = MethodsCompat
                    .getExternalCacheDir(getActivity());
            fileSize += FileUtil.getDirSize(externalCacheDir);
            fileSize += FileUtil.getDirSize(new File(
                    org.kymjs.kjframe.utils.FileUtils.getSDCardPath()
                            + File.separator + "KJLibrary/cache"));
        }
        if (fileSize > 0)
            cacheSize = FileUtil.formatFileSize(fileSize);
        tvCache.setText(cacheSize);
    }

    public static boolean isMethodsCompat(int VersionCode) {
        int currentVersion = android.os.Build.VERSION.SDK_INT;
        return currentVersion >= VersionCode;
    }
    /**
     * 清除app缓存
     */
    public void myclearaAppCache() {
        DataCleanManager.cleanDatabases(getActivity());
        // 清除数据缓存
        DataCleanManager.cleanInternalCache(getActivity());
        // 2.2版本才有将应用缓存转移到sd卡的功能
        if (isMethodsCompat(android.os.Build.VERSION_CODES.FROYO)) {
            DataCleanManager.cleanCustomCache(MethodsCompat
                    .getExternalCacheDir(getActivity()));
        }
        // 清除编辑器保存的临时内容
        Properties props = getProperties();
        for (Object key : props.keySet()) {
            String _key = key.toString();
            if (_key.startsWith("temp"))
                removeProperty(_key);
        }
        Core.getKJBitmap().cleanCache();
    }

    /**
     * 清除保存的缓存
     */
    public Properties getProperties() {
        return AppConfig.getAppConfig(getActivity()).get();
    }
    public void removeProperty(String... key) {
        AppConfig.getAppConfig(getActivity()).remove(key);
    }
    /**
     * 清除app缓存
     *
     * @param
     */
    public void clearAppCache() {

        new Thread() {
            @Override
            public void run() {
                Message msg = new Message();
                try {
                    myclearaAppCache();
                    msg.what = CLEAN_SUC;
                } catch (Exception e) {
                    e.printStackTrace();
                    msg.what = CLEAN_FAIL;
                }
                handler.sendMessage(msg);
            }
        }.start();
    }
    private Handler handler = new Handler() {
        public void handleMessage(android.os.Message msg) {
            switch (msg.what) {
                case CLEAN_FAIL:
                    ToastUtils.show(SxApplication.getInstance(),"清除失败");
                    break;
                case CLEAN_SUC:
                    ToastUtils.show(SxApplication.getInstance(),"清除成功");
                    break;
            }
        };
    };

以上代码位于一个 fragment中,代码中用到了2个工具如下所示:

工具1:

/**
 * 应用程序配置类：用于保存用户相关信息及设置
 */
public class AppConfig {

    private final static String APP_CONFIG = "config";

    private Context mContext;
    private static AppConfig appConfig;

    public static AppConfig getAppConfig(Context context) {
        if (appConfig == null) {
            appConfig = new AppConfig();
            appConfig.mContext = context;
        }
        return appConfig;
    }


    public String get(String key) {
        Properties props = get();
        return (props != null) ? props.getProperty(key) : null;
    }

    public Properties get() {
        FileInputStream fis = null;
        Properties props = new Properties();
        try {
            // 读取files目录下的config
            // fis = activity.openFileInput(APP_CONFIG);
            // 读取app_config目录下的config
            File dirConf = mContext.getDir(APP_CONFIG, Context.MODE_PRIVATE);
            fis = new FileInputStream(dirConf.getPath() + File.separator
                    + APP_CONFIG);

            props.load(fis);
        } catch (Exception e) {
        } finally {
            try {
                fis.close();
            } catch (Exception e) {
            }
        }
        return props;
    }

    private void setProps(Properties p) {
        FileOutputStream fos = null;
        try {
            // 把config建在files目录下
            // fos = activity.openFileOutput(APP_CONFIG, Context.MODE_PRIVATE);

            // 把config建在(自定义)app_config的目录下
            File dirConf = mContext.getDir(APP_CONFIG, Context.MODE_PRIVATE);
            File conf = new File(dirConf, APP_CONFIG);
            fos = new FileOutputStream(conf);

            p.store(fos, null);
            fos.flush();
        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            try {
                fos.close();
            } catch (Exception e) {
            }
        }
    }

    public void set(Properties ps) {
        Properties props = get();
        props.putAll(ps);
        setProps(props);
    }

    public void set(String key, String value) {
        Properties props = get();
        props.setProperty(key, value);
        setProps(props);
    }

    public void remove(String... key) {
        Properties props = get();
        for (String k : key)
            props.remove(k);
        setProps(props);
    }
}

工具2:

/**
 * Android各版本的兼容方法
 */
public class MethodsCompat {
    
    @TargetApi(5)
    public static void overridePendingTransition(Activity activity, int enter_anim, int exit_anim) {
           activity.overridePendingTransition(enter_anim, exit_anim);
    }

    @TargetApi(7)
    public static Bitmap getThumbnail(ContentResolver cr, long origId, int kind, Options options) {
           return MediaStore.Images.Thumbnails.getThumbnail(cr,origId,kind, options);
    }
    
    @TargetApi(8)
    public static File getExternalCacheDir(Context context) {

//        // return context.getExternalCacheDir(); API level 8
//
//        // e.g. "<sdcard>/Android/data/<package_name>/cache/"
//        final File extCacheDir = new File(Environment.getExternalStorageDirectory(),
//            "/Android/data/" + context.getApplicationInfo().packageName + "/cache/");
//        extCacheDir.mkdirs();
//        return extCacheDir;

        return context.getExternalCacheDir();
    }

    @TargetApi(11)
    public static void recreate(Activity activity) {
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.HONEYCOMB) {
            activity.recreate();
        }
    }

    @TargetApi(11)
    public static void setLayerType(View view, int layerType, Paint paint) {
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.HONEYCOMB) {
            view.setLayerType(layerType, paint);
        }
    }

    @TargetApi(14)
    public static void setUiOptions(Window window, int uiOptions) {
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.ICE_CREAM_SANDWICH) {
            window.setUiOptions(uiOptions);
        }
    }
        

还有FileUtil类

public class FileUtil {
    /**
     * 获取目录文件大小
     *
     * @param dir
     * @return
     */
    public static 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();
            } else if (file.isDirectory()) {
                dirSize += file.length();
                dirSize += getDirSize(file); // 递归调用继续统计
            }
        }
        return dirSize;
    }

    /**
     * 转换文件大小
     *
     * @param fileS
     * @return B/KB/MB/GB
     */
    public static String formatFileSize(long fileS) {
        java.text.DecimalFormat df = new java.text.DecimalFormat("#.00");
        String fileSizeString = "";
        if (fileS < 1024) {
            fileSizeString = df.format((double) fileS) + "B";
        } else if (fileS < 1048576) {
            fileSizeString = df.format((double) fileS / 1024) + "KB";
        } else if (fileS < 1073741824) {
            fileSizeString = df.format((double) fileS / 1048576) + "MB";
        } else {
            fileSizeString = df.format((double) fileS / 1073741824) + "G";
        }
        return fileSizeString;
    }
}

以上就是缓存清理了,完美搞定!