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apk是android studio默认生成的apk，adb install时报错：
Failed to install app-debug.apk: Failure [INSTALL_FAILED_TEST_ONLY: installPackageLI]
解决方法：
adb install -t app-debug.apk #允许安装test用的apk
原文
请转载的朋友表明出处：
http://blog.csdn.net/shift_wwx/article/details/78468397
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
- 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
参考：https://blog.csdn.net/shift_wwx/article/details/78468397
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