I also find that if I create a new android project in android studio and make the new project use android SDK version 18 as the minim SDK version, there is no error.

But when I rebuild the android project, the error still exists.I tried to change it in the manifest.xml file like the below code.So I need to change the minimum Android SDK version to 18 in the android studio.When I hover the mouse over the redline, it shows the message that a minimum API level of 18 is required.Recently, when I open android studio to develop an android project, I find a red underline in the layout.xml file(4).How To Change Android Studio Minimum Android SDK Version In Existing Android Project. This time the adle file will be changed by android studio automatically.Click the ” Build -> Rebuild Project ” menu item to rebuild the android project.Click the OK button to save the selection.Then you can select your desired android Min Sdk Version and Target Sdk Version from the related dropdown list on the right side.Select the tab Flavors on the right panel, click the defaultConfig item in the dialog center list area.In the Project Structure dialog, select the app item in the Modules list on the left side.Click the android studio menu ” File -> Project Structure “.1.2 Change in android studio project structure dialog. You can search for it if you can not find it immediately. Change minSdkVersion and targetSdkVersion in the right panel.Select Project in android studio Project view.1.1 Change in the android studio project adle File. There are two methods that can change the android SDK version in android studio. Change Android SDK Version In Android Studio. Your app should compatible with all the android os versions between minSdkVersion and targetSdkVersion.targetSdkVersion: This is the android os version that your app actually executed.minSdkVersion: This is the minimum version of android os that your app support.First, we should know the below two terms about the android SDK version.

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