出错场景
运行一个老项目，编译时报以下错误
Execution failed for task ':app:processDebugMainManifest'. > Manifest merger failed : android:exported needs to be explicitly specified for <activity>. Apps targeting Android 12 and higher are required to specify an explicit value for `android:exported` when the corresponding component has an intent filter defined. See https://developer.android.com/guide/topics/manifest/activity-element#exported for details. * Try: Run with --stacktrace option to get the stack trace. Run with --info or --debug option to get more log output. Run with --scan to get full insights.
解决方案
根据错误提示，targetSdkVersion大于等于SDK 31(也就是Android 12)时，如果有的Activity配置了Intent-filter，必须也同时配置exported属性，否则编译失败。
所以我们有2种解决方案
- 降低targetSdkVersion为30.
defaultConfig { applicationId "com.example.app" minSdkVersion 21 //targetSdkVersion 31 targetSdkVersion 30 }
- 将Manifest中有配置Intent-filter的Activity加上
android:exported属性
<activity android:name=".MainActivity" android:exported="true" android:label="@string/app_name" android:launchMode="standard" android:screenOrientation="portrait"> <intent-filter> <action android:name="android.intent.action.MAIN" /> <category android:name="android.intent.category.LAUNCHER" /> </intent-filter> </activity>
