It's not easy to help you with this.
If you followed correctly all the passages it should work.
Which version of B4A are you installing?
Can you confirm that you have installed the Android SDK in a separate folder like this
and the Java Package is something like this in a separate folder
Did you set all the B4A paths correctly?
If you are sure that everything is correct I don't know how to help you furthermore.
Which error do you receive when trying to start SDK MANAGER?
After opening sdk manager ,the message appeared.
How I fixed ?
Error: Warning: Found corrupted package.xml at C:\android-sdk\build-tools\27.0.1\package.xml
Exception in thread "main" java.lang.NullPointerException
at com.android.repository.api.SchemaModule.createLatestFactory(SchemaModule.java:88)
at com.android.sdklib.repository.IdDisplay.create(IdDisplay.java:34)
at com.android.sdklib.repository.legacy.local.LocalSdk.scanExtras(LocalSdk.java:1165)
at com.android.sdklib.repository.legacy.local.LocalSdk.getPkgsInfos(LocalSdk.java:571)
at com.android.sdklib.repository.legacy.LegacyLocalRepoLoader.parseLegacyLocalPackage(LegacyLocalRepoLoader.java:100)
at com.android.repository.impl.manager.LocalRepoLoaderImpl.parsePackages(LocalRepoLoaderImpl.java:167)
at com.android.repository.impl.manager.LocalRepoLoaderImpl.getPackages(LocalRepoLoaderImpl.java:124)
at com.android.repository.impl.manager.RepoManagerImpl$LoadTask.run(RepoManagerImpl.java:518)
at com.android.repository.api.RepoManager$DummyProgressRunner.runSyncWithProgress(RepoManager.java:397)
at com.android.repository.impl.manager.RepoManagerImpl.load(RepoManagerImpl.java:365)
at com.android.repository.api.RepoManager.loadSynchronously(RepoManager.java:290)
at com.android.sdklib.repository.AndroidSdkHandler$RepoConfig.createRepoManager(AndroidSdkHandler.java:725)
at com.android.sdklib.repository.AndroidSdkHandler.getSdkManager(AndroidSdkHandler.java:296)
at com.android.sdklib.tool.sdkmanager.SdkManagerCliSettings.setSdkHandler(SdkManagerCliSettings.java:101)
at com.android.sdklib.tool.sdkmanager.SdkManagerCli.<init>(SdkManagerCli.java:95)
at com.android.sdklib.tool.sdkmanager.SdkManagerCli.main(SdkManagerCli.java:74)
at com.android.sdklib.tool.sdkmanager.SdkManagerCli.main(SdkManagerCli.java:48)
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