Android获取应用缓存、删除应用缓存

获取缓存

val cacheSize: String = DataCleanManager.getTotalCacheSize(CommonLib.mContext)

删除缓存

DataCleanManager.clearAllCache(CommonLib.mContext)

DataCleanManager

mport android.content.Context;
import android.os.Environment;

import java.io.File;
import java.math.BigDecimal;

public class DataCleanManager {

    public static String getTotalCacheSize (Context context) throws Exception {
        return getFormatSize (getTotalCacheSizeInNum (context));
    }

    public static long getTotalCacheSizeInNum (Context context) throws Exception {
        long cacheSize = getFolderSize (context.getCacheDir ());
        if (Environment.getExternalStorageState ().equals (Environment.MEDIA_MOUNTED)) {
            cacheSize += getFolderSize (context.getExternalCacheDir ());
        }
        return cacheSize;
    }

    public static void clearAllCache (Context context) {
        try {
            deleteDir (context.getCacheDir ());
            if (Environment.getExternalStorageState ().equals (Environment.MEDIA_MOUNTED)) {
                deleteDir (context.getExternalCacheDir ());
                if (context.getExternalCacheDir () == null || !context.getExternalCacheDir().exists ()) {
                    context.getExternalCacheDir().mkdirs ();
                }
            }
            final File cacheDir = context.getApplicationContext ().getCacheDir ();
            deleteDir (cacheDir);
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

    private static boolean deleteDir (File dir) {
        if (!dir.isDirectory ()) {
            return dir.delete ();
        }
        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
    //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;
        if (file == null || !file.exists () || !file.isDirectory ()) {
            return size;
        }
        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 () + "K";
        }

        double gigaByte = megaByte / 1024;
        if (gigaByte < 1) {
            BigDecimal result2 = new BigDecimal (Double.toString (megaByte));
            return result2.setScale (2, BigDecimal.ROUND_HALF_UP) .toPlainString () + "M";
        }

        double teraBytes = gigaByte / 1024;
        if (teraBytes < 1) {
            BigDecimal result3 = new BigDecimal (Double.toString (gigaByte));
            return result3.setScale (2, BigDecimal.ROUND_HALF_UP) .toPlainString () + "G";
        }
        BigDecimal result4 = new BigDecimal (teraBytes);
        return result4.setScale (2, BigDecimal.ROUND_HALF_UP).toPlainString () + "T";
    }


}