java - Android Studio 错误 : "Manifest merger failed: Apps targeting Android 12"

Question

我已将我的模拟器版本和 Android SDK 版本更新为 Android S (Android 12)。更新后，我无法运行该项目。我无法运行 Hello, World!项目(空项目)，但我可以构建 Gradle，但我无法运行该项目。我总是得到错误:

Manifest merger failed: Apps targeting Android 12 and higher arerequired to specify an explicit value for android: exported when thecorresponding component has an intent filter defined. Seehttps://developer.android.com/guide/topics/manifest/activity-element#exportedfor details.

我该如何解决？
这是一个屏幕截图:

使用 Android 12 SDK 时如何解决此问题？
This question是关于将解决方案应用于此问题后的问题，并且与此问题不同。此外，这个问题早于 this .

Answer 1

您需要指定 android:exported="false"或 android:exported="true"显现:

<activity
    android:name=".MainActivity"
    android:exported="true"
    android:theme="@style/Theme.MyApplication.NoActionBar">
    <intent-filter>
        <action android:name="android.intent.action.MAIN" />
        <category android:name="android.intent.category.LAUNCHER" />
    </intent-filter>
</activity>

如 the document 中所述:

If your app targets Android 12 and contains activities, services, orbroadcast receivers that use intent filters, you must explicitlydeclare the android: exported attribute for these app components.

Warning: If an activity, service, or broadcast receiver uses intentfilters and doesn't have an explicitly-declared value forandroid:exported, your app can't be installed on a device that runsAndroid 12.

还有 check何时对“android:exported”值使用真/假。