Android realizes the function of clearing application cache

In this article, we share the specific code of Android to clear the application cache for your reference. The specific contents are as follows

import android.content.Context;
import android.os.Environment;
import java.io.File;
import java.math.BigDecimal;
 
/**
 *  Get the cache size and clean the cache 
 */
 
public class DataCleanManagerUtils {
 
 /**
  * Context.getExternalFilesDir() --> SDCard/Android/data/ Package name of your application /files/  Directory, 1 General release 1 Some data stored for a long time 
  * Context.getExternalCacheDir() --> SDCard/Android/data/ Your application package name /cache/ Directory, 1 Store temporary cache data in general 
  */
 
 /**
  *  Get cached value 
  */
 public static String getTotalCacheSize(Context context) {
 
  long cacheSize = getFolderSize(context.getCacheDir());
  if (Environment.getExternalStorageState().equals(Environment.MEDIA_MOUNTED)) {
   cacheSize += getFolderSize(context.getExternalCacheDir());
  }
  return getFormatSize(cacheSize);
 }
 
 /**
  *  Clear all caches 
  */
 public static void clearAllCache(Context context) {
  deleteDir(context.getCacheDir());
  if (Environment.getExternalStorageState().equals(Environment.MEDIA_MOUNTED)) {
   deleteDir(context.getExternalCacheDir());
   //TODO  Pay attention to troubleshooting when there is a web page cleaning, whether it exists /data/data/ Application package Can't be found under the directory database Problems with folders 
   context.deleteDatabase("webview.db");
   context.deleteDatabase("webviewCache.db");
  }
 }
 
 /**
  *  Delete a file 
  */
 private static 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();
  }
  if (dir != null) {
   return dir.delete();
  } else {
   return false;
  }
 }
 
 /**
  *  Get a file 
  */
 public static long getFolderSize(File file) {
  long size = 0;
  if (file != null) {
   File[] fileList = file.listFiles();
   if (fileList != null && fileList.length > 0) {
    for (int i = 0; i < fileList.length; i++) {
     //  If there are files below 
     if (fileList[i].isDirectory()) {
      size = size + getFolderSize(fileList[i]);
     } else {
      size = size + fileList[i].length();
     }
    }
   }
  }
  return size;
 }
 
 /**
  *  Formatting unit 
  */
 public static String getFormatSize(double size) {
  double kiloByte = size / 1024;
  double megaByte = kiloByte / 1024;
  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 = BigDecimal.valueOf(teraBytes);
  return result4.setScale(2, BigDecimal.ROUND_HALF_UP).toPlainString()
   + "TB";
 }
}