在C盘根目录下建立以下批处理文件：
c:
cd C:\Program Files\Microvirt\MEmu
adb start-server
c:
cd C:\Android\Sdk\platform-tools
adb connect 127.0.0.1:21503
cd\
在命令提示符（管理员）下运行它就OK了。
flutter config --android-sdk 自己的android sdk路径Android SDK默认的安装地址为：
C:\Users\Administrator\AppData\Local\Android\SDK
现需要把它搬到 C:\Android\Sdk
操作如下：
1.把C:\Users\Administrator\AppData\Local\Android\SDK剪切复制到C:\Android\Sdk；
2.在FLutter sdk 目录下运行如下命令：
flutter config --android-sdk C:\Android\Sdk
3.在环境变量中把ANDROID_HOME改为C:\Android\Sdk；
重启，这样就OK了。
https://baijiahao.baidu.com/s?id=1630789160989369444&wfr=spider&for=pc
安装后还是无法联网的，需要以下步骤才能联网：
设置--》网络和互联网--》私人DNS -->把自动改为关闭
就能上网了。
===============CentOS 7.6================
1.查看系统时间
查看当前系统时间以及时区
结果是：
Mon Jul 8 09:23:31 UTC 2019
2.更改系统时间时区
timedatectl set-timezone Asia/Shanghai
3.再次查看
结果是：
Mon Jul 8 17:25:28 CST 2019
4.可以重启后查看，防止重启后失效
=======================
https://www.jianshu.com/p/d58dab805ca6
keytool -genkey -v -keystore ./key.jks -keyalg RSA -keysize 2048 -validity 10000 -alias key
apk 输出在：
C:\Users\Administrator\AndroidStudioProjects\flutter_app\build\app\outputs\apk\release
key.properties
storePassword=123456
keyPassword=123456
keyAlias=key
storeFile=C:/Users/Administrator/AndroidStudioProjects/flutter_app/key.jks
build.gradle
def localProperties = new Properties()
def localPropertiesFile = rootProject.file('local.properties')
if (localPropertiesFile.exists()) {
localPropertiesFile.withReader('UTF-8') { reader ->
localProperties.load(reader)
}
}
def flutterRoot = localProperties.getProperty('flutter.sdk')
if (flutterRoot == null) {
throw new GradleException("Flutter SDK not found. Define location with flutter.sdk in the local.properties file.")
}
def flutterVersionCode = localProperties.getProperty('flutter.versionCode')
if (flutterVersionCode == null) {
flutterVersionCode = '1'
}
def flutterVersionName = localProperties.getProperty('flutter.versionName')
if (flutterVersionName == null) {
flutterVersionName = '1.0'
}
apply plugin: 'com.android.application'
apply plugin: 'kotlin-android'
apply from: "$flutterRoot/packages/flutter_tools/gradle/flutter.gradle"
def keystorePropertiesFile = rootProject.file("key.properties")
def keystoreProperties = new Properties()
keystoreProperties.load(new FileInputStream(keystorePropertiesFile))
android {
compileSdkVersion 28
sourceSets {
main.java.srcDirs += 'src/main/kotlin'
}
lintOptions {
disable 'InvalidPackage'
}
defaultConfig {
// TODO: Specify your own unique Application ID (https://developer.android.com/studio/build/application-id.html).
applicationId "com.example.flutter_app"
minSdkVersion 16
targetSdkVersion 28
versionCode flutterVersionCode.toInteger()
versionName flutterVersionName
testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner"
}
signingConfigs {
release {
keyAlias keystoreProperties['keyAlias']
keyPassword keystoreProperties['keyPassword']
storeFile file(keystoreProperties['storeFile'])
storePassword keystoreProperties['storePassword']
}
}
buildTypes {
release {
// TODO: Add your own signing config for the release build.
// Signing with the debug keys for now, so `flutter run --release` works.
//signingConfig signingConfigs.debug
signingConfig signingConfigs.release
}
}
}
flutter {
source '../..'
}
dependencies {
implementation "org.jetbrains.kotlin:kotlin-stdlib-jdk7:$kotlin_version"
testImplementation 'junit:junit:4.12'
androidTestImplementation 'androidx.test:runner:1.1.1'
androidTestImplementation 'androidx.test.espresso:espresso-core:3.1.1'
}