No targets devices/emulators available. 使用模擬器出現異常,無法使用

指令:ionic cordova emulate android 

異常訊息:

[native-run] ERR_NO_TARGET: No targets devices/emulators available. Cannot create AVD because there is no suitable API installation. Use --sdk-info to reveal missing packages and other issues.

avdmanager list avd    --列出所有系統中所有的AVD    

(環境變數中要有 %ANDROID_HOME%\tools\bin 才可以執行)

avdmanager list target --列出目標的AVD

C:\Users\morse>avdmanager list target

Available Android targets:==============] 100% Fetch remote repository...

----------

id: 1 or "android-19"

Name: Android API 19

Type: Platform

API level: 19

Revision: 4

----------

id: 2 or "android-28"

Name: Android API 28

Type: Platform

API level: 28

Revision: 6

----------

id: 3 or "android-29"

Name: Android API 29

Type: Platform

API level: 29

Revision: 4

ionic指定模擬器：

手機

ionic cordova emulate android --target=Nexus_5X_API_26_x86

ionic cordova emulate android --target=Nexus_5X_API_26_x86 --verbose

ionic cordova emulate android --target=Nexus_5X_API_26_x86 --warning-mode all

平板

ionic cordova emulate android --target=Nexus_9_API_27

SDK 管理工具

sdkmanager --install "system-images;android-29;default;x86"

ionic cordova build example

Examples

ionic cordova build android
ionic cordova build android --buildConfig=build.json
ionic cordova build android --prod --release -- -- --gradleArg=-PcdvBuildMultipleApks=true
ionic cordova build android --prod --release -- -- --keystore=filename.keystore --alias=myalias
ionic cordova build android --prod --release -- -- --minSdkVersion=21
ionic cordova build android --prod --release -- -- --versionCode=55
ionic cordova build android --prod --release --buildConfig=build.json
ionic cordova build ios
ionic cordova build ios --buildConfig=build.json
ionic cordova build ios --prod --release
ionic cordova build ios --prod --release -- --developmentTeam="ABCD" --codeSignIdentity="iPhone Developer" --packageType="app-store"
ionic cordova build ios --prod --release --buildConfig=build.json

Execution failed for task ':app:stripDebugDebugSymbols'.

ionic cordova build android 

錯誤訊息:

Execution failed for task ':app:stripDebugDebugSymbols'.

> No version of NDK matched the requested version 21.0.6113669. Versions available locally: 21.3.6528147

解決:

下載對應版本NDK

ionic cordova 改為 AndroidX

修改    \platforms\android\gradle.properties

android.useAndroidX=true

android.enableJetifier=true

Build:

    ionic cordova build android

錯誤訊息:

該項目使用AndroidX依賴項，但未啟用'android.useAndroidX'屬性。在gradle.properties文件中將此屬性設置為true，然後重試。

檢測到以下AndroidX依賴項：

...

解決:

# add plugin to enable AndroidX in the project

cordova plugin add cordova-plugin-androidx

# add plugin to patch existing plugin source that uses the Android Support Library to use AndroidX

cordova plugin add cordova-plugin-androidx-adapter