Android Log 封装

package com.myutils.l; import android.util.Log; import org.json.JSONArray; import org.json.JSONException; import org.json.JSONObject; /** * @author zengmiaosen * @email 1510809124@qq.com * @CreateDate 2016/9/22 1:39 * @Descrition 日志打印 */ public class L { //是否打印 private static boolean isLog = false; //打印标签 private static String logtag = "logtag"; /** * logcat在实现上对于message的内存分配大概是4k左右, * 所以超过的内容都直接被丢弃,设置文本长度超过3000分多条打印 */ private final static int LOG_MAXLENGTH = 3000; //记录上次的logLocation private static String lastLogMethod = ""; /** * 打印文本 * * @param text */ public static void i(String text) { if (isLog) { Log.i(logtag, logContent(text) + logLocation()); } } /** * 打印异常文本 * * @param text */ public static void e(String text) { if (isLog) { Log.e(logtag, logContent(text) + logLocation()); } } /** * 打印异常 * * @param msg * @param e */ public static void e(String msg, Exception e) { if (isLog) { Log.e(logtag, msg + logLocation(), e); } } /** * 打印json格式文本 * * @param json */ public static void json(String json) { if (isLog) { json("", json); } } /** * 打印json格式文本 * * @param prefix 前缀文本 * @param json */ public static void json(String prefix, String json) { if (isLog) { String text = prefix + fomatJson(json); Log.i(logtag, logContent(text) + logLocation()); } } /** * 打印内容 * * @param text * @return */ private static String logContent(String text) { if (text.length() < 50) {//内容长度不超过50，前面加空格加到50 int minLeng = 50 - text.length(); // Log.i(logtag, "leng========" + leng + " " + text.length()); if (minLeng > 0) { StringBuilder stringBuilder = new StringBuilder(); for (int i = 0; i < minLeng; i++) { stringBuilder.append(" "); } text = text + stringBuilder.toString(); } } else if (text.length() > LOG_MAXLENGTH) {//内容超过logcat单条打印上限，分批打印 //Log.i(logtag,"text长度========="+text.length()); int logTime = text.length() / LOG_MAXLENGTH; for (int i = 0; i < logTime; i++) { String leng = text.substring(i * LOG_MAXLENGTH, (i + 1) * LOG_MAXLENGTH); //提示 if (i == 0) { Log.i(logtag, "打印分" + (logTime+1) + "条显示 :" + leng); } else { Log.i(logtag, "接上条↑" + leng); } } text = text.substring(logTime * LOG_MAXLENGTH, text.length()); } return text; } /** * 定位打印的方法 * * @return */ private static StringBuilder logLocation() { StackTraceElement logStackTrace = getLogStackTrace(); StringBuilder stringBuilder = new StringBuilder(); stringBuilder.append(" ☞.(").append(logStackTrace.getFileName()).append(":").append(logStackTrace.getLineNumber() + ")"); //Log.i(logtag, "leng========" + stringBuilder + " " + lastLogMethod); if (stringBuilder.toString().equals(lastLogMethod)) { stringBuilder = new StringBuilder(""); } else { lastLogMethod = stringBuilder.toString(); } return stringBuilder; } /** * json格式化 * * @param jsonStr * @return */ private static String fomatJson(String jsonStr) { try { jsonStr = jsonStr.trim(); if (jsonStr.startsWith("{")) { JSONObject jsonObject = new JSONObject(jsonStr); return jsonObject.toString(2); } if (jsonStr.startsWith("[")) { JSONArray jsonArray = new JSONArray(jsonStr); return jsonArray.toString(2); } } catch (JSONException e) { e.printStackTrace(); } return "Json格式有误: " + jsonStr; } /** * 获取打印的方法栈 * * @return */ private static StackTraceElement getLogStackTrace() { StackTraceElement logTackTraces = null; StackTraceElement[] stackTraces = Thread.currentThread().getStackTrace(); for (int i = 0; i < stackTraces.length; i++) { StackTraceElement stackTrace = stackTraces[i]; if (stackTrace.getClassName().equals(L.class.getName())) { //getLogStackTrace--logLocation--i/e/json--方法栈,所以方法栈的位置是当前方法栈后的第3个 logTackTraces = stackTraces[i + 3]; i = stackTraces.length; } } return logTackTraces; } public static void setLogtag(String logtag) { L.logtag = logtag; } public static void setIsLog(boolean isLog) { L.isLog = isLog; } }