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Log,打印 %S 占位符，一个占符跟一个变量
F2 运行错误 可以查看错误
用+号拼接占常量池 占内存 -
对Log的封装：
1.能够控制日志输出
2.输出这行日志是什么方法的某一行
3.不用手动打开日志开关，自动开关
5.debug 是用开发版是调试 release 上线的
5.能够对上线的Apk 把Log 日志开关再次打开
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1获取上线debug id 唯一表示 appLicationid:可以修改 打包 appLicationid:可以有不同版本
他们的名不一样
获取包名 : getPackageName -
//Log.isLoggable 接受两个参数 int String
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查看类里面字段 Ctrl Fn F12
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Log 只能有4000个长度
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Thread.currentThread.getStackTrace();//
package com.m.k.seetaoism.utils;
import android.text.TextUtils;
import android.util.Log;
import com.m.k.seetaoism.home.BuildConfig;
import java.util.Collection;
import java.util.Locale;
/**
* adb shell setprop log.tag.{@link #PRIVATE_TAG} LOG_LEVEL
* eg: adb shell setprop log.tag.Test d
* Created by Cherry on 2018/06/07.
* adb shell log.tag.Test V
*
*
* eg: Logger.v("%s %s %d + %d = %d,","TAG","Hello: ",5,6,11)
* will print "TAG Hello: 5 + 6 = 11"
1. 能够控制日志的输出与否
2. 输出这行日志是从哪个类文件的什么方法里面的某一行输出的。
3. 不用手动打开日志开关，根据打包的类型自动设置是否输出日志。
4. 能都对上线的apk，把Log日志开关再次打开
*/
public class Logger {
private static final String SIMPLE_PREFIX = "[(%s:%d)#%s()] -> ";
private static final String MORE_DETAIL_PREFIX = "at %s.%s(%s:%d)";
private static final StringBuffer mMessageBuffer = new StringBuffer();
private static String PRIVATE_TAG = "1904";
private static String PUBLIC_TAG = "1904";
private static boolean mDebugable = BuildConfig.DEBUG;
boolean b = Log.isLoggable("Test", Log.INFO);
public static boolean DEBUG_V = Log.isLoggable(PRIVATE_TAG, Log.VERBOSE);
public static boolean DEBUG_D = Log.isLoggable(PRIVATE_TAG, Log.DEBUG);;
private static boolean DEBUG_MORE_DETAIL_STACK_INFO = false;
private static int STACK_TRACE_INDEX = 5;
private static final String SUFFIX = ".java";
/**
* 正式发布产品的时候应该关闭debug 模式
*
* @param debug 设置Log 模式，如果true 表示debug模式该模式可以从控制台查看相关log信息，否则不是
*/
public static void setDebug(boolean debug) {
mDebugable = debug;
}
public static boolean isDebug(){
return mDebugable;
}
public static synchronized void v(String format, Object... args) {
if(mDebugable){ // false
log(Log.VERBOSE,buildPrivateMessage(null,format, args));
}else{
if(DEBUG_V){
log(Log.VERBOSE,buildPrivateMessage(null,format, args));
}
}
}
/**
* 级别最低，用于输出任意对调试或者开发过程中有帮助的信息,
*
* @param format the format string (see {@link java.util.Formatter#format})
* @param args the list of arguments passed to the formatter. If there are
* more arguments than required by {@code format},
* additional arguments are ignored.
*/
public static synchronized void v(Throwable throwable, String format, Object... args) {
if(mDebugable){ // false
log(Log.VERBOSE,buildPrivateMessage(throwable,format, args));
}else{
if(DEBUG_V){
log(Log.VERBOSE,buildPrivateMessage(throwable,format, args));
}
}
}
public static synchronized void d(String format, Object... args) {
if(mDebugable){
log(Log.DEBUG,buildPrivateMessage(null,format, args));
}else{
if(DEBUG_D){
log(Log.DEBUG,buildPrivateMessage(null,format, args));
}
}
}
public static synchronized void d() {
if(mDebugable){
log(Log.DEBUG,buildPrivateMessage(null,null, null));
}else{
if(DEBUG_D){
log(Log.DEBUG,buildPrivateMessage(null,null, null));
}
}
}
/**
* 调试级别, 比VERBOSE高，用于输出调试信息
*
* @param format the format string (see {@link java.util.Formatter#format})
* @param args the list of arguments passed to the formatter. If there are
* more arguments than required by {@code format},
* additional arguments are ignored.
*/
public static synchronized void d(Throwable throwable, String format, Object... args) {
if(mDebugable){
log(Log.DEBUG,buildPrivateMessage(throwable,format, args));
}else{
if(DEBUG_D){
log(Log.DEBUG,buildPrivateMessage(throwable,format, args));
}
}
}
/**
* 用于输出比较重要的信息，系统默认的级别，
*
* @param format the format string (see {@link java.util.Formatter#format})
* @param args the list of arguments passed to the formatter. If there are
* more arguments than required by {@code format},
* additional arguments are ignored.
*/
public static void i(String format, Object... args) {
Log.i(PUBLIC_TAG, buildPrivateMessage(null,format, args));
}
public static void i(Throwable throwable, String format, Object... args) {
Log.i(PUBLIC_TAG, buildPrivateMessage(null,format, args), throwable);
}
public static void w(String format, Object... args) {
Log.w(PUBLIC_TAG, buildPrivateMessage(null,format, args));
}
public static void w(Throwable throwable, String format, Object... args) {
Log.w(PUBLIC_TAG, buildPrivateMessage(throwable,format, args), throwable);
}
public static void e(String format, Object... args) {
Log.e(PUBLIC_TAG, buildPrivateMessage(null,format, args));
}
public static void e(Throwable throwable, String format, Object... args) {
Log.e(PUBLIC_TAG, buildPrivateMessage(null,format, args), throwable);
}
public String formatJson(String json){
return JsonFormat.format(json);
}
private static String getSimpleStackTrace(){
StackTraceElement[] stackTrace = Thread.currentThread().getStackTrace();
StackTraceElement targetElement = stackTrace[STACK_TRACE_INDEX];
return String.format(Locale.getDefault(),SIMPLE_PREFIX,targetElement.getFileName(),targetElement.getLineNumber(),targetElement.getMethodName());
}
public static String getMoreDetailStackTrace() {
StackTraceElement traceElements[] = Thread.currentThread().getStackTrace();
StringBuilder builder = new StringBuilder();
for (int i = STACK_TRACE_INDEX; i < Math.min(traceElements.length, 10); i++) {
StackTraceElement traceElement = traceElements[i];
builder.append(String.format(Locale.getDefault(), MORE_DETAIL_PREFIX, traceElement.getClassName(),
traceElement.getMethodName(), traceElement.getFileName(), traceElement.getLineNumber()));
builder.append("\n");
}
return builder.toString();
}
private static String buildPrivateMessage(Throwable throwable, String format, Object... args) {
mMessageBuffer.delete(0, mMessageBuffer.length()); // 清空
try {
mMessageBuffer.append("{ ");
// 栈帧
mMessageBuffer.append(getSimpleStackTrace());
if(!TextUtils.isEmpty(format)){
mMessageBuffer.append((args == null) ? format : String.format(Locale.CHINA, format, args));
}
} catch (Exception e) {
mMessageBuffer.append("buildPrivateMessage exception " + e.getMessage());
}
if(DEBUG_MORE_DETAIL_STACK_INFO){
mMessageBuffer.append("\n");
mMessageBuffer.append(getMoreDetailStackTrace());
mMessageBuffer.append("\n");
}
if(throwable != null){
mMessageBuffer.append(throwable.toString());
mMessageBuffer.append("\n");
}
mMessageBuffer.append(" } \n");
return mMessageBuffer.toString();
}
public static String isNull(Object o) {
return o == null ? " Null" : "Not Null";
}
public static String toStringOb(Object o) {
return o == null ? " Null" : o.toString();
}
public static int getCollectionSize(Collection collection){
if(collection != null){
return collection.size();
}
else{
return 0;
}
}
private static boolean isEnableDebug(){
if(!mDebugable){
return false;
}
if(!DEBUG_V){
return false;
}
return true;
}
private static void log(int level, String mes){
if(mes.length() > 4000){
for(int i = 0 ; i < mes.length(); i += 4000 ){ // 5000
if( i + 4000 < mes.length()){
println(level,mes.substring(i,i + 4000));
}else{
println(level,mes.substring(i,mes.length()));
}
}
}else{
println(level,mes);
}
}
private static void println(int level,String mes){
switch (level){
case Log.ERROR:
Log.e(PRIVATE_TAG,mes);
break;
case Log.WARN:
Log.w(PRIVATE_TAG,mes);
break;
case Log.INFO:
Log.i(PRIVATE_TAG,mes);
break;
case Log.DEBUG:
Log.d(PRIVATE_TAG,mes);
break;
case Log.VERBOSE:
Log.v(PRIVATE_TAG,mes);
break;
}
}
}
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