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平台版本是android 7.0，在adb install *.apk 会提示下面的错误：

 Failure [INSTALL_FAILED_TEST_ONLY: installPackageLI]

方法1：

修改AndroidManifest.xml 中android:testOnly="true" 改成 android:testOnly="false"，或者直接去掉。

方法2：

adb push *.apk /tmp

adb shell pm install -t /tmp/*.apk

方法3：

adb install -t *.apk

方法4：

Android Studio 3.0 and FLAG_TEST_ONLY  一文中，给出了关于Android studio 3.0中出现问题的说明：

Option to indicate this application is only for testing purposes. For example, it may expose functionality or data outside of itself that would cause a security hole, but is useful for testing. This kind of application can not be installed without the INSTALL_ALLOW_TEST flag, which means only through adb install. 1. You cannot install an app with android:testOnly="true" by conventional means, such as from an Android file manager or from a download off of a Web site 2. Android Studio 3.0 sets android:testOnly="true" on APKs that are run from the IDE

解决办法：

在gradle.properties(项目根目录或者gradle全局配置目录 ~/.gradle/)文件中添加： android.injected.testOnly=false

参考文献：

https://commonsware.com/blog/2017/10/31/android-studio-3p0-flag-test-only.html

https://stackoverflow.com/questions/25274296/adb-install-fails-with-install-failed-test-only