清除缓存

public class DataCleanManager {
    /**
     17.     * * 清除本应用内部缓存(/data/data/com.xxx.xxx/cache) * *
     18.     *
     19.     * @param context
     20.     */
    public static void cleanInternalCache(Context context) {
        deleteFilesByDirectory(context.getCacheDir());
    }

    /**
     26.     * * 清除本应用所有数据库(/data/data/com.xxx.xxx/databases) * *
     27.     *
     28.     * @param context
     29.     */
    public static void cleanDatabases(Context context) {
        deleteFilesByDirectory(new File("/data/data/"
                + context.getPackageName() + "/databases"));
    }

    /**
     36.     * * 清除本应用SharedPreference(/data/data/com.xxx.xxx/shared_prefs) *
     37.     *
     38.     * @param context
     39.     */
    public static void cleanSharedPreference(Context context) {
        deleteFilesByDirectory(new File("/data/data/"
                + context.getPackageName() + "/shared_prefs"));
    }

    /**
     46.     * * 按名字清除本应用数据库 * *
     47.     *
     48.     * @param context
     49.     * @param dbName
     50.     */
    public static void cleanDatabaseByName(Context context, String dbName) {
        context.deleteDatabase(dbName);
    }

    /**
     56.     * * 清除/data/data/com.xxx.xxx/files下的内容 * *
     57.     *
     58.     * @param context
     59.     */
    public static void cleanFiles(Context context) {
        deleteFilesByDirectory(context.getFilesDir());
    }

    /**
     65.     * * 清除外部cache下的内容(/mnt/sdcard/android/data/com.xxx.xxx/cache)
     66.     *
     67.     * @param context
     68.     */
    public static void cleanExternalCache(Context context) {
        if (Environment.getExternalStorageState().equals(
                Environment.MEDIA_MOUNTED)) {
            deleteFilesByDirectory(context.getExternalCacheDir());
        }
    }
    /**
     76.     * * 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 * *
     77.     *
     78.     * @param filePath
     79.     * */
    public static void cleanCustomCache(String filePath) {
        deleteFilesByDirectory(new File(filePath));
    }

    /**
     85.     * * 清除本应用所有的数据 * *
     86.     *
     87.     * @param context
     88.     * @param filepath
     89.     */
    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);
        }
    }

    /**
     105.     * * 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 * *
     106.     *
     107.     * @param directory
     108.     */
    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;
    }

    /**
     139.     * 删除指定目录下文件及目录
     140.     *
     141.     * @param deleteThisPath
     142.     * @param filepath
     143.     * @return
     144.     */
    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) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            }
        }
    }




//计算大小


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

}

MainActivity

上面查找控件 自己敲
下面方法
filesDir = MainActivity.this.getFilesDir();
        try {
            String cacheSize = DataCleanManager.getCacheSize(filesDir);
            textView.setText(cacheSize);
        } catch (Exception e) {
            e.printStackTrace();
        }

        btndelete.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {

                DataCleanManager.cleanApplicationData(MainActivity.this,filesDir.getAbsolutePath());
                try {
                    String cacheSize = DataCleanManager.getCacheSize(filesDir);
                    textView.setText(cacheSize);
                } catch (Exception e) {
                    e.printStackTrace();
                }

            }
        });

    }}

xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    android:orientation="vertical"
    xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent"
    android:layout_height="match_parent" tools:context="com.bwie.lianxi34.MainActivity">
    <Button

        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:id="@+id/bt"
        />
    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:id="@+id/tv2"
        />
</LinearLayout>