对于第三方优秀开源项目抱着能借鉴(copy)的就不写，能精简的绝不照抄，能照抄绝不依赖的原则。对于android 开发日志管理工具首推Timber，因为够轻量化且功能满足开发需求。繁琐的github项目库只扣下来一个工具类 class Timber
/** Logging for lazy people. */
class Timber private constructor() {
init {
throw AssertionError()
}
/** A facade for handling logging calls. Install instances via [`Timber.plant()`][.plant]. */
abstract class Tree {
@get:JvmSynthetic // Hide from public API.
internal val explicitTag = ThreadLocal<String>()
@get:JvmSynthetic // Hide from public API.
internal open val tag: String?
get() {
val tag = explicitTag.get()
if (tag != null) {
explicitTag.remove()
}
return tag
}
/** Log a verbose message with optional format args. */
open fun v(message: String?, vararg args: Any?) {
prepareLog(Log.VERBOSE, null, message, *args)
}
/** Log a verbose exception and a message with optional format args. */
open fun v(t: Throwable?, message: String?, vararg args: Any?) {
prepareLog(Log.VERBOSE, t, message, *args)
}
/** Log a verbose exception. */
open fun v(t: Throwable?) {
prepareLog(Log.VERBOSE, t, null)
}
/** Log a debug message with optional format args. */
open fun d(message: String?, vararg args: Any?) {
prepareLog(Log.DEBUG, null, message, *args)
}
/** Log a debug exception and a message with optional format args. */
open fun d(t: Throwable?, message: String?, vararg args: Any?) {
prepareLog(Log.DEBUG, t, message, *args)
}
/** Log a debug exception. */
open fun d(t: Throwable?) {
prepareLog(Log.DEBUG, t, null)
}
/** Log an info message with optional format args. */
open fun i(message: String?, vararg args: Any?) {
prepareLog(Log.INFO, null, message, *args)
}
/** Log an info exception and a message with optional format args. */
open fun i(t: Throwable?, message: String?, vararg args: Any?) {
prepareLog(Log.INFO, t, message, *args)
}
/** Log an info exception. */
open fun i(t: Throwable?) {
prepareLog(Log.INFO, t, null)
}
/** Log a warning message with optional format args. */
open fun w(message: String?, vararg args: Any?) {
prepareLog(Log.WARN, null, message, *args)
}
/** Log a warning exception and a message with optional format args. */
open fun w(t: Throwable?, message: String?, vararg args: Any?) {
prepareLog(Log.WARN, t, message, *args)
}
/** Log a warning exception. */
open fun w(t: Throwable?) {
prepareLog(Log.WARN, t, null)
}
/** Log an error message with optional format args. */
open fun e(message: String?, vararg args: Any?) {
prepareLog(Log.ERROR, null, message, *args)
}
/** Log an error exception and a message with optional format args. */
open fun e(t: Throwable?, message: String?, vararg args: Any?) {
prepareLog(Log.ERROR, t, message, *args)
}
/** Log an error exception. */
open fun e(t: Throwable?) {
prepareLog(Log.ERROR, t, null)
}
/** Log an assert message with optional format args. */
open fun wtf(message: String?, vararg args: Any?) {
prepareLog(Log.ASSERT, null, message, *args)
}
/** Log an assert exception and a message with optional format args. */
open fun wtf(t: Throwable?, message: String?, vararg args: Any?) {
prepareLog(Log.ASSERT, t, message, *args)
}
/** Log an assert exception. */
open fun wtf(t: Throwable?) {
prepareLog(Log.ASSERT, t, null)
}
/** Log at `priority` a message with optional format args. */
open fun log(priority: Int, message: String?, vararg args: Any?) {
prepareLog(priority, null, message, *args)
}
/** Log at `priority` an exception and a message with optional format args. */
open fun log(priority: Int, t: Throwable?, message: String?, vararg args: Any?) {
prepareLog(priority, t, message, *args)
}
/** Log at `priority` an exception. */
open fun log(priority: Int, t: Throwable?) {
prepareLog(priority, t, null)
}
/** Return whether a message at `priority` should be logged. */
@Deprecated("Use isLoggable(String, int)", ReplaceWith("this.isLoggable(null, priority)"))
protected open fun isLoggable(priority: Int) = true
/** Return whether a message at `priority` or `tag` should be logged. */
protected open fun isLoggable(tag: String?, priority: Int) = isLoggable(priority)
private fun prepareLog(priority: Int, t: Throwable?, message: String?, vararg args: Any?) {
// Consume tag even when message is not loggable so that next message is correctly tagged.
val tag = tag
if (!isLoggable(tag, priority)) {
return
}
var message = message
if (message.isNullOrEmpty()) {
if (t == null) {
return // Swallow message if it's null and there's no throwable.
}
message = getStackTraceString(t)
} else {
if (args.isNotEmpty()) {
message = formatMessage(message, args)
}
if (t != null) {
message += "\n" + getStackTraceString(t)
}
}
log(priority, tag, message, t)
}
/** Formats a log message with optional arguments. */
protected open fun formatMessage(message: String, args: Array<out Any?>) =
message.format(*args)
private fun getStackTraceString(t: Throwable): String {
// Don't replace this with Log.getStackTraceString() - it hides
// UnknownHostException, which is not what we want.
val sw = StringWriter(256)
val pw = PrintWriter(sw, false)
t.printStackTrace(pw)
pw.flush()
return sw.toString()
}
/**
* Write a log message to its destination. Called for all level-specific methods by default.
*
* @param priority Log level. See [Log] for constants.
* @param tag Explicit or inferred tag. May be `null`.
* @param message Formatted log message.
* @param t Accompanying exceptions. May be `null`.
*/
protected abstract fun log(priority: Int, tag: String?, message: String, t: Throwable?)
}
/** A [Tree] for debug builds. Automatically infers the tag from the calling class. */
open class DebugTree : Tree() {
private val fqcnIgnore = listOf(
Timber::class.java.name,
Timber.Forest::class.java.name,
Tree::class.java.name,
DebugTree::class.java.name
)
override val tag: String?
get() = super.tag ?: Throwable().stackTrace
.first { it.className !in fqcnIgnore }
.let(::createStackElementTag)
/**
* Extract the tag which should be used for the message from the `element`. By default
* this will use the class name without any anonymous class suffixes (e.g., `Foo$1`
* becomes `Foo`).
*
* Note: This will not be called if a [manual tag][.tag] was specified.
*/
protected open fun createStackElementTag(element: StackTraceElement): String? {
var tag = element.className.substringAfterLast('.')
val m = ANONYMOUS_CLASS.matcher(tag)
if (m.find()) {
tag = m.replaceAll("")
}
// Tag length limit was removed in API 26.
return if (tag.length <= MAX_TAG_LENGTH || Build.VERSION.SDK_INT >= 26) {
tag
} else {
tag.substring(0, MAX_TAG_LENGTH)
}
}
/**
* Break up `message` into maximum-length chunks (if needed) and send to either
* [Log.println()][Log.println] or
* [Log.wtf()][Log.wtf] for logging.
*
* {@inheritDoc}
*/
override fun log(priority: Int, tag: String?, message: String, t: Throwable?) {
if (message.length < MAX_LOG_LENGTH) {
if (priority == Log.ASSERT) {
Log.wtf(tag, message)
} else {
Log.println(priority, tag, message)
}
return
}
// Split by line, then ensure each line can fit into Log's maximum length.
var i = 0
val length = message.length
while (i < length) {
var newline = message.indexOf('\n', i)
newline = if (newline != -1) newline else length
do {
val end = Math.min(newline, i + MAX_LOG_LENGTH)
val part = message.substring(i, end)
if (priority == Log.ASSERT) {
Log.wtf(tag, part)
} else {
Log.println(priority, tag, part)
}
i = end
} while (i < newline)
i++
}
}
companion object {
private const val MAX_LOG_LENGTH = 4000
private const val MAX_TAG_LENGTH = 23
private val ANONYMOUS_CLASS = Pattern.compile("(\\$\\d+)+$")
}
}
companion object Forest : Tree() {
/** Log a verbose message with optional format args. */
@JvmStatic
override fun v(@NonNls message: String?, vararg args: Any?) {
treeArray.forEach { it.v(message, *args) }
}
/** Log a verbose exception and a message with optional format args. */
@JvmStatic
override fun v(t: Throwable?, @NonNls message: String?, vararg args: Any?) {
treeArray.forEach { it.v(t, message, *args) }
}
/** Log a verbose exception. */
@JvmStatic
override fun v(t: Throwable?) {
treeArray.forEach { it.v(t) }
}
/** Log a debug message with optional format args. */
@JvmStatic
override fun d(@NonNls message: String?, vararg args: Any?) {
treeArray.forEach { it.d(message, *args) }
}
/** Log a debug exception and a message with optional format args. */
@JvmStatic
override fun d(t: Throwable?, @NonNls message: String?, vararg args: Any?) {
treeArray.forEach { it.d(t, message, *args) }
}
/** Log a debug exception. */
@JvmStatic
override fun d(t: Throwable?) {
treeArray.forEach { it.d(t) }
}
/** Log an info message with optional format args. */
@JvmStatic
override fun i(@NonNls message: String?, vararg args: Any?) {
treeArray.forEach { it.i(message, *args) }
}
/** Log an info exception and a message with optional format args. */
@JvmStatic
override fun i(t: Throwable?, @NonNls message: String?, vararg args: Any?) {
treeArray.forEach { it.i(t, message, *args) }
}
/** Log an info exception. */
@JvmStatic
override fun i(t: Throwable?) {
treeArray.forEach { it.i(t) }
}
/** Log a warning message with optional format args. */
@JvmStatic
override fun w(@NonNls message: String?, vararg args: Any?) {
treeArray.forEach { it.w(message, *args) }
}
/** Log a warning exception and a message with optional format args. */
@JvmStatic
override fun w(t: Throwable?, @NonNls message: String?, vararg args: Any?) {
treeArray.forEach { it.w(t, message, *args) }
}
/** Log a warning exception. */
@JvmStatic
override fun w(t: Throwable?) {
treeArray.forEach { it.w(t) }
}
/** Log an error message with optional format args. */
@JvmStatic
override fun e(@NonNls message: String?, vararg args: Any?) {
treeArray.forEach { it.e(message, *args) }
}
/** Log an error exception and a message with optional format args. */
@JvmStatic
override fun e(t: Throwable?, @NonNls message: String?, vararg args: Any?) {
treeArray.forEach { it.e(t, message, *args) }
}
/** Log an error exception. */
@JvmStatic
override fun e(t: Throwable?) {
treeArray.forEach { it.e(t) }
}
/** Log an assert message with optional format args. */
@JvmStatic
override fun wtf(@NonNls message: String?, vararg args: Any?) {
treeArray.forEach { it.wtf(message, *args) }
}
/** Log an assert exception and a message with optional format args. */
@JvmStatic
override fun wtf(t: Throwable?, @NonNls message: String?, vararg args: Any?) {
treeArray.forEach { it.wtf(t, message, *args) }
}
/** Log an assert exception. */
@JvmStatic
override fun wtf(t: Throwable?) {
treeArray.forEach { it.wtf(t) }
}
/** Log at `priority` a message with optional format args. */
@JvmStatic
override fun log(priority: Int, @NonNls message: String?, vararg args: Any?) {
treeArray.forEach { it.log(priority, message, *args) }
}
/** Log at `priority` an exception and a message with optional format args. */
@JvmStatic
override fun log(
priority: Int,
t: Throwable?,
@NonNls message: String?,
vararg args: Any?
) {
treeArray.forEach { it.log(priority, t, message, *args) }
}
/** Log at `priority` an exception. */
@JvmStatic
override fun log(priority: Int, t: Throwable?) {
treeArray.forEach { it.log(priority, t) }
}
override fun log(priority: Int, tag: String?, message: String, t: Throwable?) {
throw AssertionError() // Missing override for log method.
}
/**
* A view into Timber's planted trees as a tree itself. This can be used for injecting a logger
* instance rather than using static methods or to facilitate testing.
*/
@Suppress(
"NOTHING_TO_INLINE", // Kotlin users should reference `Tree.Forest` directly.
"NON_FINAL_MEMBER_IN_OBJECT" // For japicmp check.
)
@JvmStatic
open inline fun asTree(): Tree = this
/** Set a one-time tag for use on the next logging call. */
@JvmStatic
fun tag(tag: String): Tree {
for (tree in treeArray) {
tree.explicitTag.set(tag)
}
return this
}
/** Add a new logging tree. */
@JvmStatic
fun plant(tree: Tree) {
require(tree !== this) { "Cannot plant Timber into itself." }
synchronized(trees) {
trees.add(tree)
treeArray = trees.toTypedArray()
}
}
/** Adds new logging trees. */
@JvmStatic
fun plant(vararg trees: Tree) {
for (tree in trees) {
requireNotNull(tree) { "trees contained null" }
require(tree !== this) { "Cannot plant Timber into itself." }
}
synchronized(this.trees) {
Collections.addAll(this.trees, *trees)
treeArray = this.trees.toTypedArray()
}
}
/** Remove a planted tree. */
@JvmStatic
fun uproot(tree: Tree) {
synchronized(trees) {
require(trees.remove(tree)) { "Cannot uproot tree which is not planted: $tree" }
treeArray = trees.toTypedArray()
}
}
/** Remove all planted trees. */
@JvmStatic
fun uprootAll() {
synchronized(trees) {
trees.clear()
treeArray = emptyArray()
}
}
/** Return a copy of all planted [trees][Tree]. */
@JvmStatic
fun forest(): List<Tree> {
synchronized(trees) {
return unmodifiableList(trees.toList())
}
}
@get:[JvmStatic JvmName("treeCount")]
val treeCount
get() = treeArray.size
// Both fields guarded by 'trees'.
private val trees = ArrayList<Tree>()
@Volatile
private var treeArray = emptyArray<Tree>()
}
}如何使用？网上有很多，比如最常用的处理异常崩溃和管理日志输出：
/**
* 崩溃处理机制lib标准配置
*
* @param restartActivity 奔溃后重启界面
* @param errorActivity 错误提示界面
*/
fun Application.initCrashLibConfig(
restartActivity: AppCompatActivity,
errorActivity: AppCompatActivity
) {
//防止项目崩溃，崩溃后打开错误界面
CrashConfig.Builder.create()
.backgroundMode(CrashConfig.BACKGROUND_MODE_SHOW_CUSTOM) //default: CaocConfig.BACKGROUND_MODE_SHOW_CUSTOM
.enabled(true)//是否启用CustomActivityOnCrash崩溃拦截机制
.showErrorDetails(false) //是否必须显示包含错误详细信息的按钮 default: true
.showRestartButton(false) //是否必须显示“重新启动应用程序”按钮或“关闭应用程序”按钮default: true
.logErrorOnRestart(false) //是否必须重新堆栈堆栈跟踪 default: true
.trackActivities(true) //是否必须跟踪用户访问的活动及其生命周期调用 default: false
.minTimeBetweenCrashesMs(3000) //应用程序崩溃之间必须经过的时间 default: 3000
.restartActivity(restartActivity::class.java) // 重启的activity
.errorActivity(errorActivity::class.java) //发生错误跳转的activity
.apply()
CustomActivityOnCrash.install(this);//如果没有任何配置，程序崩溃显示的是默认的设置
}/**
* debug渠道显示全日志
* 非debug渠道仅显示warning & error log
*
* @param keyValue log key
*/
fun Application.initLogConfig(@NonNls keyValue: String) {
if (BuildConfig.DEBUG) {
Timber.plant(object : Timber.DebugTree() {
override val tag: String?
get() = keyValue
})
} else {
Timber.plant(CrashReportingTree())
}
}在application onCreate()方法中调用：
initCrashLibConfig(StartActivity(), ErrorActivity())//防止项目崩溃，崩溃后打开错误界面
initLogConfig("****")//日志打印配置