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：
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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. |
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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 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：
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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
注：
Android Studio 3.0会在debug apk的manifest文件application标签里自动添加
android:testOnly="true"属性，导致IDE中run跑出的apk在大部分手机上只能用adb install -t <apk>来安装，在oppo手机上甚至安装不了解决办法
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：https://gist.github.com/xujiaao/5fd127a72979cdc3c70dcc1324786f87
也有开发者赞成studio悄悄地这么做，理由：
https://commosware.com/blog/2017/10/31/android-studio-3p0-flag-test-only.html