Android 清除相关

 demo 1:

cleanInternalCache    : 清除内部缓存
cleanInternalFiles    : 清除内部文件
cleanInternalDbs      : 清除内部数据库
cleanInternalDbByName : 根据名称清除数据库
cleanInternalSP       : 清除内部SP
cleanExternalCache    : 清除外部缓存
cleanCustomCache      : 清除自定义目录下的文件


public class CleanUtils {

    private CleanUtils() {
        throw new UnsupportedOperationException("u can't instantiate me...");
    }

    /**
     * 清除内部缓存
     * <p>/data/data/com.xxx.xxx/cache</p>
     *
     * @param context 上下文
     * @return {@code true}: 清除成功<br>{@code false}: 清除失败
     */
    public static boolean cleanInternalCache(Context context) {
        return FileUtils.deleteFilesInDir(context.getCacheDir());
    }

    /**
     * 清除内部文件
     * <p>/data/data/com.xxx.xxx/files</p>
     *
     * @param context 上下文
     * @return {@code true}: 清除成功<br>{@code false}: 清除失败
     */
    public static boolean cleanInternalFiles(Context context) {
        return FileUtils.deleteFilesInDir(context.getFilesDir());
    }

    /**
     * 清除内部数据库
     * <p>/data/data/com.xxx.xxx/databases</p>
     *
     * @param context 上下文
     * @return {@code true}: 清除成功<br>{@code false}: 清除失败
     */
    public static boolean cleanInternalDbs(Context context) {
        return FileUtils.deleteFilesInDir(context.getFilesDir().getParent() + File.separator + "databases");
    }

    /**
     * 根据名称清除数据库
     * <p>/data/data/com.xxx.xxx/databases/dbName</p>
     *
     * @param context 上下文
     * @param dbName  数据库名称
     * @return {@code true}: 清除成功<br>{@code false}: 清除失败
     */
    public static boolean cleanInternalDbByName(Context context, String dbName) {
        return context.deleteDatabase(dbName);
    }

    /**
     * 清除内部SP
     * <p>/data/data/com.xxx.xxx/shared_prefs</p>
     *
     * @param context 上下文
     * @return {@code true}: 清除成功<br>{@code false}: 清除失败
     */
    public static boolean cleanInternalSP(Context context) {
        return FileUtils.deleteFilesInDir(context.getFilesDir().getParent() + File.separator + "shared_prefs");
    }

    /**
     * 清除外部缓存
     * <p>/storage/emulated/0/android/data/com.xxx.xxx/cache</p>
     *
     * @param context 上下文
     * @return {@code true}: 清除成功<br>{@code false}: 清除失败
     */
    public static boolean cleanExternalCache(Context context) {
        return SDCardUtils.isSDCardEnable() && FileUtils.deleteFilesInDir(context.getExternalCacheDir());
    }

    /**
     * 清除自定义目录下的文件
     *
     * @param dirPath 目录路径
     * @return {@code true}: 清除成功<br>{@code false}: 清除失败
     */
    public static boolean cleanCustomCache(String dirPath) {
        return FileUtils.deleteFilesInDir(dirPath);
    }

    /**
     * 清除自定义目录下的文件
     *
     * @param dir 目录
     * @return {@code true}: 清除成功<br>{@code false}: 清除失败
     */
    public static boolean cleanCustomCache(File dir) {
        return FileUtils.deleteFilesInDir(dir);
    }
}



 demo2:

//获取缓存
private void initCacheSize() {
    /*
    * 获取SD卡根目录:Environment.getExternalStorageDirectory().getAbsolutePath();
        外部Cache路径:/mnt/sdcard/android/data/com.xxx.xxx/cache 一般存储缓存数据(注:通过getExternalCacheDir()获取)
        外部File路径:/mnt/sdcard/android/data/com.xxx.xxx/files 存储长时间存在的数据
        (注:通过getExternalFilesDir(String type)获取, type为特定类型,可以是以下任何一种
                    Environment.DIRECTORY_MUSIC,
                    Environment.DIRECTORY_PODCASTS,
                     Environment.DIRECTORY_RINGTONES,
                     Environment.DIRECTORY_ALARMS,
                     Environment.DIRECTORY_NOTIFICATIONS,
                     Environment.DIRECTORY_PICTURES,
                      Environment.DIRECTORY_MOVIES. )
    * */
        sdPath = Environment.getExternalStorageDirectory().getAbsolutePath();
        outCachePath = activity.getExternalCacheDir();
        outFilePath = activity.getExternalFilesDir(Environment.DIRECTORY_ALARMS);

        try {
            String outCacheSize = DataClearManager.getCacheSize(outCachePath);
            String outFileSize = DataClearManager.getCacheSize(outFilePath);
            float totalCacheSize = Float.parseFloat(outCacheSize) + Float.parseFloat(outFileSize);
            tvMemorySize.setText(totalCacheSize + "");
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

//清理缓存
new Thread(new Runnable() {
                    @Override
                    public void run() {
                        DataClearManager.cleanApplicationData(activity);
                        try {
                            Thread.sleep(1000);
                        } catch (InterruptedException e) {
                            e.printStackTrace();
                        }
                    }
                }).start();
                ToastUtils.showToastNew("缓存已被清除!");
                tvMemorySize.setText("0KB");




/**
 * 主要功能有清除内/外缓存,清除数据库,清除sharedPreference,清除files和清除自定义目录
 */
public class DataClearManager {
    /**
     * * 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);
        if (filepath == null) {
            return;
        }
        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
    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;
    }

    /**
     * 删除指定目录下文件及目录
     *
     * @param filePath
     * @param deleteThisPath
     */
    public static void deleteFolderFile(String filePath, boolean deleteThisPath) {
        if (!TextUtils.isEmpty(filePath)) {
            try {
                File file = new File(filePath);
                if (file.isDirectory()) {// 如果下面还有文件
                    File files[] = file.listFiles();
                    for (int i = 0; i < files.length; i++) {
                        deleteFolderFile(files[i].getAbsolutePath(), true);
                    }
                }
                if (deleteThisPath) {
                    if (!file.isDirectory()) {// 如果是文件,删除
                        file.delete();
                    } else {// 目录
                        if (file.listFiles().length == 0) {// 目录下没有文件或者目录,删除
                            file.delete();
                        }
                    }
                }
            } catch (Exception e) {
                e.printStackTrace();
            }
        }
    }

    /**
     * 格式化单位
     *
     * @param size
     * @return
     */
    public static String getFormatSize(double size) {
        double kiloByte = size / 1024;
        if (kiloByte < 1) {
            return size + "b";
        }

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

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转载自blog.csdn.net/dubo_csdn/article/details/85757601