update 自动清理缓存

app/src/main/java/org/yameida/worktool/activity/ListenActivity.kt

@@ -179,6 +179,7 @@ class ListenActivity : AppCompatActivity() {
     private fun initData() {
         HttpUtil.checkUpdate()
         HttpUtil.getMyConfig(toast = false)
+        CacheUtil.autoDelete()
     }
 
     private fun initNotification() {

app/src/main/java/org/yameida/worktool/utils/CacheUtil.kt

@@ -0,0 +1,46 @@
+package org.yameida.worktool.utils
+
+import com.blankj.utilcode.util.LogUtils
+import com.blankj.utilcode.util.Utils
+import java.io.File
+import kotlin.concurrent.thread
+
+object CacheUtil {
+
+    /**
+     * 异步执行
+     * 删除7天前的下载文件
+     */
+    fun autoDelete() {
+        thread {
+            LogUtils.d("执行自动清除缓存任务")
+            val externalFilesDir = Utils.getApp().getExternalFilesDir("share")
+            if (externalFilesDir != null && externalFilesDir.isDirectory) {
+                val count = deleteOldFiles(System.currentTimeMillis() - 7 * 86400 * 1000, externalFilesDir)
+                LogUtils.d("已清除文件数: $count")
+            } else {
+                LogUtils.d("未发现缓存文件夹")
+            }
+        }
+    }
+
+    private fun deleteOldFiles(deleteTime: Long, directory: File?): Int {
+        var count = 0
+        if (directory != null && directory.isDirectory) {
+            val files = directory.listFiles()
+            if (files != null) {
+                for (file in files) {
+                    if (file.isDirectory) {
+                        count += deleteOldFiles(deleteTime, file)
+                    } else {
+                        if (file.lastModified() < deleteTime) {
+                            file.delete()
+                            count += 1
+                        }
+                    }
+                }
+            }
+        }
+        return count
+    }
+}