Android Log工具类

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2024-07-30 16:28:43 227人阅读

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博客原文地址：http://worthed.com/blog/2014/10/16/android-log/

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工欲善其事，必先利其器。在Android开发过程中，相信都会遇到这样的问题：

Log太多，不容易找到自己设置打印的内容
找到Log但是定位到Java源码有不是很方便
对Log打印需要设置Tag，大多时候Tag就是本类的类名，存在重复的工作
发布正式版本需要注释或者关掉很多Log开关

参考Android源码，使用官方的Log打印方法（设置Tag），然后再Eclipse里面设置过滤标签，这样就可以查看某一个类的Log了，但是这样效率比较低下。基于上面的一些问题，我研究实现了一种简单易用的Log工具类。我的工具类主要有如下特点：

减少一个Log参数
调用某些Log方法，可以实现跳转到Java源代码的功能
采用此工具类，屏蔽Log只需要关闭Log总开关即可

减少一个Log参数

实现方法是采用 StackTraceElement 获取调用类的方法，代码如下：

private static String getClassName() {  String result = "";  StackTraceElement thisMethodStack = (new Exception()).getStackTrace()[2];  result = thisMethodStack.getClassName();  return result;}

跳转到源代码Log调用处

实现双击Log跳转到Java源代码调用处，实现方法是参考Android Logcat错处日志，发现Eclipse实现跳转是因为Log中有 at MyClassName.MyMethodName(MClassName.java:行数) 。具体见代码：

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/** * Realization of double click jump events. *  * @return */private static String callMethodAndLine() {  String result = "at ";  StackTraceElement thisMethodStack = (new Exception()).getStackTrace()[2];  result += thisMethodStack.getClassName() + ".";  result += thisMethodStack.getMethodName();  result += "(" + thisMethodStack.getFileName();  result += ":" + thisMethodStack.getLineNumber() + ")  ";  return result;}

屏蔽所有Log

采用 LogUtils 工具类，只需要将此类中DEBUG_LEVEL设置的值大一点。

如果想要屏蔽所有的Log只需要将 DEBUG_LEVEL 设置为 Log.ASSERT 即可。
如果想要只显示Error则只需要将 DEBUG_LEVEL 设置为 Log.WARN 即可。
如果只想要显示Error和Warn则将 DEBUG_LEVEL 设置为 Log.INFO 即可。

使用方法

只需要用LogUtils替换掉Android系统的Log类，并去掉log方法的第一个参数，例如：

1	`LogUtils.d(Object); // 次行代码将打印Object类的toString()`

无代码无真相，下面是此工具类源码：

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/** * Copyright 2014 Zhenguo Jin * * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * *   http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */package com.worthed.util;import android.util.Log;/** * This class can replace android.util.Log. *  * @author jingle1267@163.com *  * @description And you can turn off the log by set DEBUG_LEVEL = Log.ASSERT. *  */public class LogUtils {  /**  * Master switch.To catch error info you need set this value below Log.WARN  */  public static final int DEBUG_LEVEL = 0;  /**  * ‘System.out‘ switch.When it is true, you can see the ‘System.out‘ log.  * Otherwise, you cannot.  */  public static final boolean DEBUG_SYSOUT = false;  /**  * Send a {@link #VERBOSE} log message.  *   * @param obj  */  public static void v(Object obj) {      if (Log.VERBOSE > DEBUG_LEVEL) {          String tag = getClassName();          String msg = obj != null ? obj.toString() : "obj == null";          Log.v(tag, msg);      }  }  /**  * Send a {@link #DEBUG_LEVEL} log message.  *   * @param obj  */  public static void d(Object obj) {      if (Log.DEBUG > DEBUG_LEVEL) {          String tag = getClassName();          String msg = obj != null ? obj.toString() : "obj == null";          Log.d(tag, msg);      }  }  /**  * Send an {@link #INFO} log message.  *   * @param obj  */  public static void i(Object obj) {      if (Log.INFO > DEBUG_LEVEL) {          String tag = getClassName();          String msg = obj != null ? obj.toString() : "obj == null";          Log.i(tag, msg);      }  }  /**  * Send a {@link #WARN} log message.  *   * @param obj  */  public static void w(Object obj) {      if (Log.WARN > DEBUG_LEVEL) {          String tag = getClassName();          String msg = obj != null ? obj.toString() : "obj == null";          Log.w(tag, msg);      }  }  /**  * Send an {@link #ERROR} log message.  *   * @param obj  */  public static void e(Object obj) {      if (Log.ERROR > DEBUG_LEVEL) {          String tag = getClassName();          String msg = obj != null ? obj.toString() : "obj == null";          Log.e(tag, msg);      }  }  /**  * What a Terrible Failure: Report a condition that should never happen. The  * error will always be logged at level ASSERT with the call stack.  * Depending on system configuration, a report may be added to the  * {@link android.os.DropBoxManager} and/or the process may be terminated  * immediately with an error dialog.  *   * @param obj  */  public static void wtf(Object obj) {      if (Log.ASSERT > DEBUG_LEVEL) {          String tag = getClassName();          String msg = obj != null ? obj.toString() : "obj == null";          Log.wtf(tag, msg);      }  }  /**  * Send a {@link #VERBOSE} log message.  *   * @param tag  *            Used to identify the source of a log message. It usually  *            identifies the class or activity where the log call occurs.  * @param msg  *            The message you would like logged.  */public static void v(String tag, String msg) {if (Log.VERBOSE > DEBUG_LEVEL) {Log.v(tag, msg);}}/**  * Send a {@link #DEBUG_LEVEL} log message.  *   * @param tag  *            Used to identify the source of a log message. It usually  *            identifies the class or activity where the log call occurs.  * @param msg  *            The message you would like logged.  */public static void d(String tag, String msg) {if (Log.DEBUG > DEBUG_LEVEL) {Log.d(tag, msg);}}/**  * Send an {@link #INFO} log message.  *   * @param tag  *            Used to identify the source of a log message. It usually  *            identifies the class or activity where the log call occurs.  * @param msg  *            The message you would like logged.  */public static void i(String tag, String msg) {if (Log.INFO > DEBUG_LEVEL) {Log.i(tag, msg);}}/**  * Send a {@link #WARN} log message.  *   * @param tag  *            Used to identify the source of a log message. It usually  *            identifies the class or activity where the log call occurs.  * @param msg  *            The message you would like logged.  */public static void w(String tag, String msg) {if (Log.WARN > DEBUG_LEVEL) {Log.w(tag, msg);}}/**  * Send an {@link #ERROR} log message.  *   * @param tag  *            Used to identify the source of a log message. It usually  *            identifies the class or activity where the log call occurs.  * @param msg  *            The message you would like logged.  */public static void e(String tag, String msg) {if (Log.ERROR > DEBUG_LEVEL) {Log.e(tag, msg);}}/**  * What a Terrible Failure: Report a condition that should never happen. The  * error will always be logged at level ASSERT with the call stack.  * Depending on system configuration, a report may be added to the  * {@link android.os.DropBoxManager} and/or the process may be terminated  * immediately with an error dialog.  *   * @param tag  *            Used to identify the source of a log message.  * @param msg  *            The message you would like logged.  */public static void wtf(String tag, String msg) {if (Log.ASSERT > DEBUG_LEVEL) {Log.wtf(tag, msg);}}/**  * Send a {@link #VERBOSE} log message. And just print method name and  * position in black.  */public static void print() {if (Log.VERBOSE > DEBUG_LEVEL) {String tag = getClassName();String method = callMethodAndLine();Log.v(tag, method);if (DEBUG_SYSOUT) {System.out.println(tag + "  " + method);}}}/**  * Send a {@link #DEBUG_LEVEL} log message.  *   * @param object  *            The object to print.  */public static void print(Object object) {if (Log.DEBUG > DEBUG_LEVEL) {String tag = getClassName();String method = callMethodAndLine();String content = "";if (object != null) {content = object.toString() + "                    ----    "+ method;} else {content = " ## " + "                ----    " + method;}Log.d(tag, content);if (DEBUG_SYSOUT) {System.out.println(tag + "  " + content + "  " + method);}}}/**  * Send an {@link #ERROR} log message.  *   * @param object  *            The object to print.  */public static void printError(Object object) {if (Log.ERROR > DEBUG_LEVEL) {String tag = getClassName();String method = callMethodAndLine();String content = "";if (object != null) {content = object.toString() + "                    ----    "+ method;} else {content = " ## " + "                    ----    " + method;}Log.e(tag, content);if (DEBUG_SYSOUT) {System.err.println(tag + "  " + method + "  " + content);}}}/**  * Print the array of stack trace elements of this method in black.  *   * @return  */public static void printCallHierarchy() {if (Log.VERBOSE > DEBUG_LEVEL) {String tag = getClassName();String method = callMethodAndLine();String hierarchy = getCallHierarchy();Log.v(tag, method + hierarchy);if (DEBUG_SYSOUT) {System.out.println(tag + "  " + method + hierarchy);}}}/**  * Print debug log in blue.  *   * @param object  *            The object to print.  */public static void printMyLog(Object object) {if (Log.DEBUG > DEBUG_LEVEL) {String tag = "MYLOG";String method = callMethodAndLine();String content = "";if (object != null) {content = object.toString() + "                    ----    "+ method;} else {content = " ## " + "                ----    " + method;}Log.d(tag, content);if (DEBUG_SYSOUT) {System.out.println(tag + "  " + content + "  " + method);}}}private static String getCallHierarchy() {String result = "";StackTraceElement[] trace = (new Exception()).getStackTrace();for (int i = 2; i < trace.length; i++) {result += "\r\t" + trace[i].getClassName() + "."+ trace[i].getMethodName() + "():"+ trace[i].getLineNumber();}return result;}private static String getClassName() {String result = "";StackTraceElement thisMethodStack = (new Exception()).getStackTrace()[2];result = thisMethodStack.getClassName();return result;}/**  * Realization of double click jump events.  *   * @return  */private static String callMethodAndLine() {String result = "at ";StackTraceElement thisMethodStack = (new Exception()).getStackTrace()[2];result += thisMethodStack.getClassName() + ".";result += thisMethodStack.getMethodName();result += "(" + thisMethodStack.getFileName();result += ":" + thisMethodStack.getLineNumber() + ")  ";return result;}}

获取更多请参看我Github分享的Android工具类库 android-utils 。

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博客原文地址：http://worthed.com/blog/2014/10/16/android-log/

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Android Log工具类

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