fix: StandardCharsets.UTF_8 替换为 Charset.forName("UTF-8")

Android 4.2（API 17）不支持 java.nio.charset.StandardCharsets（API 19+），
5 个文件统一改用兼容 API 1 的 String 重载：
- DeviceIdentityProvider / HMacShaUtils / Md5Utils: Charset.forName
- UrlParamBuilder: URLEncoder.encode(str, "UTF-8")
- ContentDetailUtils: 删除未使用的 import

app/src/main/java/com/pukka/jiecheng/device/DeviceIdentityProvider.java

@@ -9,7 +9,7 @@ import com.pukka.jiecheng.config.AppConfiguration;
 import com.pukka.libcore.boxShared.BoxSharedParamsUtils;
 import com.pukka.libcore.utils.LogUtils;
 
-import java.nio.charset.StandardCharsets;
+import java.nio.charset.Charset;
 import java.security.MessageDigest;
 import java.util.Locale;
 
@@ -87,7 +87,7 @@ public class DeviceIdentityProvider {
                 return "";
             }
             MessageDigest digest = MessageDigest.getInstance("MD5");
-            byte[] hashBytes = digest.digest(source.getBytes(StandardCharsets.UTF_8));
+            byte[] hashBytes = digest.digest(source.getBytes(Charset.forName("UTF-8")));
             int usedBytes = Math.min(MD5_TRUNCATED_BYTES, hashBytes.length);
             if (usedBytes <= 0) {
                 return "";
@@ -112,7 +112,7 @@ public class DeviceIdentityProvider {
                 return "";
             }
             MessageDigest digest = MessageDigest.getInstance("SHA-256");
-            byte[] hashBytes = digest.digest(source.getBytes(StandardCharsets.UTF_8));
+            byte[] hashBytes = digest.digest(source.getBytes(Charset.forName("UTF-8")));
             StringBuilder hexBuilder = new StringBuilder(hashBytes.length * 2);
             for (byte hashByte : hashBytes) {
                 hexBuilder.append(String.format(Locale.ROOT, "%02X", hashByte));

app/src/main/java/com/pukka/jiecheng/utils/UrlParamBuilder.java

@@ -1,8 +1,8 @@
 package com.pukka.jiecheng.utils;
 
+import java.io.UnsupportedEncodingException;
 import java.util.Map;
 import java.net.URLEncoder;
-import java.nio.charset.StandardCharsets;
 
 public class UrlParamBuilder {
 
@@ -60,9 +60,15 @@ public class UrlParamBuilder {
                     urlBuilder.append("&");
                 }
 
-                urlBuilder.append(URLEncoder.encode(entry.getKey(), StandardCharsets.UTF_8))
+                try {
+                    urlBuilder.append(URLEncoder.encode(entry.getKey(), "UTF-8"))
                         .append("=")
-                        .append(URLEncoder.encode(entry.getValue(), StandardCharsets.UTF_8));
+                        .append(URLEncoder.encode(entry.getValue(), "UTF-8"));
+                } catch (UnsupportedEncodingException e) {
+                    urlBuilder.append(entry.getKey())
+                        .append("=")
+                        .append(entry.getValue());
+                }
             }
         }
 

app/src/main/java/com/pukka/jiecheng/video/utils/ContentDetailUtils.java

@@ -20,7 +20,6 @@ import com.pukka.jiecheng.R;
 import com.pukka.libcore.fresco.PkSimpleDraweeView;
 import com.pukka.libcore.utils.LogUtils;
 
-import java.nio.charset.StandardCharsets;
 import java.util.Locale;
 import java.util.regex.Matcher;
 import java.util.regex.Pattern;