Performance

APK SIZE

https://github.com/facebook/redex https://tech.meituan.com/2017/04/07/android-shrink-overall-solution.html

AndroidImprove

gradle assembleDebug --stacktrace gradlew compileDebug --stacktrace compile DebugJavaWithJavac

adb logcat *:E

NestedScrollView fillport must with wrap_content child https://stackoverflow.com/questions/37205997/nestedscrollview-could-not-scroll-with-match-parent-height-child

控制台乱码问题 https://blog.csdn.net/jankingmeaning/article/details/104772104?depth_1-utm_source=distribute.pc_relevant.none-task-blog-BlogCommendFromBaidu-6&utm_source=distribute.pc_relevant.none-task-blog-BlogCommendFromBaidu-6

monkey

adb shell monkey -p cn.com.bjx.bjxtalents --pct-syskeys 0 --pct-majornav 0 --pct-anyevent 0 --pct-nav 0 --pct-touch 100 -v 10000

monkeyrunner

setx -m ANDROID_SWT "C:\Users\pang\AppData\Local\Android\Sdk\tools\lib\x86_64"

https://stackoverflow.com/questions/52815413/monkeyrunner-noclassdeffounderror-com-android-chimpchat-chimpchat @echo off rem Copyright (C) 2010 The Android Open Source Project rem rem Licensed under the Apache License, Version 2.0 (the "License"); rem you may not use this file except in compliance with the License. rem You may obtain a copy of the License at rem rem http://www.apache.org/licenses/LICENSE-2.0 rem rem Unless required by applicable law or agreed to in writing, software rem distributed under the License is distributed on an "AS IS" BASIS, rem WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. rem See the License for the specific language governing permissions and rem limitations under the License.

rem don't modify the caller's environment setlocal

rem Set up prog to be the path of this script, including following symlinks, rem and set up progdir to be the fully-qualified pathname of its directory. set prog=%~f0

rem Change current directory and drive to where the script is, to avoid rem issues with directories containing whitespaces. cd /d %~dp0

rem Check we have a valid Java.exe in the path. set java_exe= call ..\lib\find_java.bat if not defined java_exe goto :EOF for /f %%a in ("%APP_HOME%\lib\monkeyrunner-25.3.2.jar") do set jarfile=%%~nxa set frameworkdir=. set libdir=

if exist %frameworkdir%%jarfile% goto JarFileOk set frameworkdir=..\lib

if exist %frameworkdir%%jarfile% goto JarFileOk set frameworkdir=..\framework

:JarFileOk

set jarpath=%frameworkdir%%jarfile%

if not defined ANDROID_SWT goto QueryArch set swt_path=%ANDROID_SWT% goto SwtDone

:QueryArch

for /f "delims=" %%a in ('%frameworkdir%\..\bin\archquery') do set swt_path=%frameworkdir%\%%a

:SwtDone

if exist "%swt_path%" goto SetPath echo SWT folder '%swt_path%' does not exist. echo Please set ANDROID_SWT to point to the folder containing swt.jar for your platform. exit /B

:SetPath

call "%java_exe%" -Xmx512m "-Djava.ext.dirs=%frameworkdir%;%swt_path%" -Dcom.android.monkeyrunner.bindir=....\platform-tools -jar %jarpath% %*

无嵌入maxheight

      <androidx.constraintlayout.widget.ConstraintLayout
            android:id="@+id/express_detail_list_parent"
            android:layout_width="match_parent"
            android:layout_height="0dp"
            android:layout_marginTop="22dp"
            app:layout_constraintHeight_default="wrap"
            app:layout_constraintHeight_max="300dp"
            app:layout_constraintTop_toBottomOf="@+id/title">

            <androidx.recyclerview.widget.RecyclerView
                android:id="@+id/express_detail_list"
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:layout_marginLeft="20dp"
                android:layout_marginRight="18dp"
                app:goodsItemExList="@{viewModel.goods}"
                app:layout_constraintTop_toTopOf="parent" />
        </androidx.constraintlayout.widget.ConstraintLayout>

ConstraintLayout 2.0

ConstraintLayoutStates 多状态视图管理

Layer = Group+

Flow = chainlayout

Motion Layout = stepful animation view

https://medium.com/google-developers/defining-motion-paths-in-motionlayout-6095b874d37

multis Helper

Code Review

Code review step 1

Clean code , Avoid null-pointer .

Code review step 2

Logistics check , Performance check .

Code review step 3

Optimize code , Experience improve .

Kotlin

takewhile tailrec尾递归优化 tailrec fun findListNode(head: ListNode?, value: Int): ListNode? { head ?: return null if (head.value == value) return head return findListNode(head.next, value) }

#3.1.2022

Apparently, we need to create a Scope using SupervisorJob(), so that the parent job is not affected by the child job crash.

coroutineScope = CoroutineScope(SupervisorJob() + Dispatchers.IO) Note the MainScope() is CoroutineScope(SupervisorJob() + Dispatchers.Main). 如中所述SupervisorJob 一个孩子的失败或取消不会导致主管工作失败，也不会影响其其他孩子，因此主管可以实施自定义策略来处理其孩子的失败

协程内顺序执行 order sample ,async 同 launch 唯一的区别就是 async 是有返回值的
GlobalScope.launch(Dispatchers.Unconfined){
var token = GlobalScope.async(Dispatchers.Unconfined) {
return@async getToken()
}.await()

var response = GlobalScope.async(Dispatchers.Unconfined) {
return@async getResponse(token)
}.await()

setText(response)
}

同一协程里的suspend可以保证顺序

mutex这个标记用来保证在任一时刻，只能有一个线程访问该对象
用于不同coroutineScope作用域,保证挂起函数的顺序执行

class UserRepository {
private val DB = Dispatchers.IO.limitedParallelism(10)

suspend fun getUserById(userId: Int): User? = withContext(DB) {
executeQuery("SELECT * FROM users WHERE id = $1", userId).singleOrNull()
}
}

/**
* [CoroutineDispatcher.limitedParallelism] use for Dispatchers.IO or Dispatchers.Default,Dispatchers.Main usually contains that limit
* [suspend] in same scope by order execute
* [Mutex] use for different coroutineScope suspend function in order execute
*/

imitedParallelism对一个scope里协程被阻塞时会按顺序执行。
mutex对不同scope的挂起函数做顺序执行。

logcat: Unexpected EOF!

This means that either the device shut down, logd crashed, or this instance of logcat was unable to read log
messages as quickly as they were being produced.

If you have enabled significant logging, look into using the -G option to increase log buffer sizes

Logcat不输出日志：检查开发者选项日志记录器缓冲大小设置多一些

susyimes/AndroidImprove