Clearly there are many causes of this problem. For me the situation was this: I had deployed to my nexus 7 (actual device) from within the Android Studio (v1.3.2). All worked fine. I then created a signed apk and uploaded to my Google Drive. After disconnecting my nexus from the usb, I went to the settings/apps and uninstalled my app (App1). I then opened google drive and clicked on my App1.apk and chose to install it (need to ensure you have allowed installation of apks in settings). Then I got the dreaded message "App not Installed"

Solution for me: go back into settings/apps and scroll though all apps and at the bottom was a pale version of my App1 (note the original App1 was at the top in Alphabetical order which was deleted as above). When clicking on the pale version it said "Not installed for this user". (I had set up my nexus to have more than one user). But in the top right corner there is a three dot button. I pressed this and it said "Uninstall for all users". Which I did and it fixed the problem. I was now able to click on App1.apk and it installed fine without the error.

我的问题和@Lunatikzx的问题类似。由于错误的权限标记被写入应用程序的属性:

<application
    android:permission="android.permission.WRITE_EXTERNAL_STORAGE"
    android:label="@string/app_name"
    android:icon="@drawable/ic_launcher"
    android:testOnly="false"
    android:debuggable="true">

什么为我修复它是改变权限标签，像这样单独的标签:

<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />

有时是因为你的手机没有足够的空间。如果是这样，请尝试清理内存，为新安装创造空间。

在我的情况下，我删除无用的权限是不需要的

我只需要一个许可

<uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" />

并删除不需要的权限，并开始给出此错误

<uses-permission android:name="android.permission.ACCESS_LOCATION_EXTRA_COMMANDS" />
<uses-permission android:name="android.permission.INSTALL_LOCATION_PROVIDER" />
<uses-permission android:name="android.permission.CONTROL_LOCATION_UPDATES" />

我也有同样的问题。我不知道即使是测试，应用程序也必须签名。

自签名后，它安装好了。

在我的情况下，我已经声明我的发射器活动为android:exported="false"

<activity android:name=".MainActivity"
            android:exported="false">

我最近瞄准了android 12，不得不把android:exported属性放在我的manifest组件中，但不知道该把什么作为值。将值更改为android:exported="true"有效。