添加LogUtils日志文件自动裁剪功能

libappbase/src/main/java/cc/winboll/studio/libappbase/LogUtils.java

@@ -100,10 +100,52 @@ public class LogUtils {
         // 加载当前应用下的所有类的 TAG
         addClassTAGList();
         loadTAGBeanSettings();
+        checkAndTrimLogFileSize();
         _IsInited = true;
         LogUtils.d(TAG, String.format("mapTAGList : %s", mapTAGList.toString()));
     }
 
+    private static void checkAndTrimLogFileSize() {
+        if (_mfLogCatchFile == null || !_mfLogCatchFile.exists()) {
+            return;
+        }
+
+        final long MAX_FILE_SIZE = 6291456L;
+        final long KEEP_FILE_SIZE = 3145728L;
+
+        long fileSize = _mfLogCatchFile.length();
+        if (fileSize <= MAX_FILE_SIZE) {
+            return;
+        }
+
+        long needSkip = fileSize - KEEP_FILE_SIZE;
+
+        try (FileInputStream fis = new FileInputStream(_mfLogCatchFile);
+             BufferedReader reader = new BufferedReader(new InputStreamReader(fis));
+             FileOutputStream fos = new FileOutputStream(_mfLogCatchFile);
+             BufferedWriter writer = new BufferedWriter(new OutputStreamWriter(fos))) {
+
+            StringBuilder sb = new StringBuilder();
+            String line;
+            long skippedTotal = 0;
+            final String lineBreak = System.lineSeparator();
+
+            while ((line = reader.readLine()) != null) {
+                byte[] lineBytes = line.getBytes();
+                skippedTotal += lineBytes.length + lineBreak.getBytes().length;
+
+                if (skippedTotal > needSkip) {
+                    sb.append(line).append(lineBreak);
+                }
+            }
+
+            writer.write(sb.toString());
+
+        } catch (IOException e) {
+            e.printStackTrace();
+        }
+    }
+
     public static Map<String, Boolean> getMapTAGList() {
         return mapTAGList;
     }