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app/src/main/java/utils/CacheDataManager.java

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+package utils;
+
+import android.content.Context;
+import android.os.Environment;
+
+import java.io.File;
+import java.math.BigDecimal;
+
+public class CacheDataManager {
+
+    public static String getTotalCacheSize(Context context) throws Exception {
+
+        long cacheSize = getFolderSize(context.getCacheDir());
+
+        if (Environment.getExternalStorageState().equals(Environment.MEDIA_MOUNTED)) {
+
+            cacheSize += getFolderSize(context.getExternalCacheDir());
+
+        }
+
+        return getFormatSize(cacheSize);
+
+    }
+
+    public static void clearAllCache(Context context) {
+
+        deleteDir(context.getCacheDir());
+
+        if (Environment.getExternalStorageState().equals(Environment.MEDIA_MOUNTED)) {
+
+            deleteDir(context.getExternalCacheDir());
+
+        }
+
+    }
+
+    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();
+
+    }
+
+// 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;
+
+    }
+
+    /**
+
+     * 格式化单位
+
+     *
+
+     * @param size
+
+     */
+
+    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";
+
+    }
+
+}