计算图片缓存大小

来源：互联网发布：深圳行知小学校园网编辑：程序博客网时间：2024/04/29 04:41

调用此方法:

btn1 = (Button) findViewById(R.id.second_btn1);btn2 = (Button) findViewById(R.id.second_btn2);tv = (TextView) findViewById(R.id.second_tv);manager = new DataCleanManager();//计算缓存数据大小btn2.setOnClickListener(new View.OnClickListener() {    @Override    public void onClick(View view) {        String size = manager.getTotalCacheSize(SecondActivity.this);        tv.setText(size);    }});//清楚缓存btn1.setOnClickListener(new View.OnClickListener() {    @Override    public void onClick(View view) {        manager.clearAllCache(SecondActivity.this);        tv.setText(" ");        Toast.makeText(SecondActivity.this,"清除完成",Toast.LENGTH_SHORT).show();    }});

方法:

public class DataCleanManager{    public String getTotalCacheSize(Context context){        long cacheSize = 0;        try {            cacheSize = getFolderSize(context.getCacheDir());        } catch (Exception e) {            e.printStackTrace();        }        if (Environment.getExternalStorageState().equals(Environment.MEDIA_MOUNTED)) {            try {                cacheSize += getFolderSize(context.getExternalCacheDir());            } catch (Exception e) {                e.printStackTrace();            }        }        return  getFormatSize(cacheSize);    }    public void clearAllCache(Context context) {        deleteDir(context.getCacheDir());        if (Environment.getExternalStorageState().equals(Environment.MEDIA_MOUNTED)) {            deleteDir(context.getExternalCacheDir());        }    }    private 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();    }    public 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;    }    public 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";    }}

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