Android log扩展

import android.util.Log;//Android 系统的log类

 

//send a DEBUG log message

Log.d(tag,msg);

//send an ERROR log message

Log.e(tag,msg);

//send a INFO log message

Log.i(tag,msg);

//send a VERBOSE log message

Log.v(tag,msg);

//send a WARN log message

Log.w(tag,msg);

 

如果应用到自己的项目中，会定义包装一个自己的log类

首先定义一个自己需要的log级别，比如说需要只打印error信息，或者打印出error与warn信息等等情况。

protected final static int LOG_LEVEL_0 = 0; // show nothing

protected final static int LOG_LEVEL_1 = 1; // show error info

protected final static int LOG_LEVEL_2 = 2; // show error and warn info

protected final static int LOG_LEVEL_3 = 3; // show error ,warn and info info

protected final static int LOG_LEVEL_4 = 4; //show all(error,warn,info,verbose)

 

//set your default LOG_LEVEL

procteted final static int LOG_LEVEL = LOG_LEVEL_4;

//set your output TAG

protected final static String TAG = "XXXX";

 

//package my own log function,it can print file name and line number of you log code excute

 

/** * log DEBUG message * @param msg : The message to log */public static void d(String msg) {if (LOG_LEVEL > LOG_LEVEL_3) {Log.d(TAG, wrapperMsg(msg));}}/** * log INFO message * @param msg : The message to log */public static void i(String msg) {if (LOG_LEVEL > LOG_LEVEL_2) {Log.i(TAG, wrapperMsg(msg));}}/** * log WARN message * @param msg : The message to log */public static void w(String msg) {if (LOG_LEVEL > LOG_LEVEL_1) {Log.w(TAG, wrapperMsg(msg));}}/** * log ERROR message * @param msg : The message to log */public static void e(String msg) {if (LOG_LEVEL > LOG_LEVEL_0) {Log.e(TAG, wrapperMsg(msg));}}/** * Wrapper the message * @param msg : The message to wrapper */protected static String wrapperMsg(String msg) {StackTraceElement elem = new Throwable().fillInStackTrace().getStackTrace()[2];return String.format("[XXX] %s (%s:%d)", msg, elem.getFileName(), elem.getLineNumber());}

 

以上是在Java侧使用的log方式，如果在JNI与lib库（C＋＋）侧使用log的话需要使用：

＃include<android/log.h>

其中有定义：

/* * Android log priority values, in ascending priority order. */typedef enum android_LogPriority { ANDROID_LOG_UNKNOWN = 0, ANDROID_LOG_DEFAULT, /* only for SetMinPriority() */ ANDROID_LOG_VERBOSE, ANDROID_LOG_DEBUG, ANDROID_LOG_INFO, ANDROID_LOG_WARN, ANDROID_LOG_ERROR, ANDROID_LOG_FATAL, ANDROID_LOG_SILENT, /* only for SetMinPriority(); must be last */} android_LogPriority;

 

使用方法：

__android_log_print(ANDROID_LOG_INFO, "TAG", "%s", "your msg");

 

方法总结，以上