增加log工具类

app/src/main/java/com/bgycc/smartcanteen/util/LogUtil.java

+package com.bgycc.smartcanteen.util;
+
+import android.util.Log;
+
+public class LogUtil {
+
+    private static boolean sEnable = false;
+
+    public static void setEnable(boolean enable) {
+        sEnable = enable;
+    }
+
+    public static void i(String tag, String log) {
+        if (!sEnable) return;
+        Log.i(tag, log);
+    }
+
+    public static void d(String tag, String log) {
+        if (!sEnable) return;
+        Log.d(tag, log);
+    }
+
+    public static void w(String tag, String log) {
+        if (!sEnable) return;
+        Log.w(tag, log);
+    }
+
+    public static void e(String tag, String log) {
+        if (!sEnable) return;
+        Log.e(tag, log);
+    }
+}