前言 {#前言}

Android程序启动时提示以下错误：

Targeting S+ (version 31 and above) requires that one of FLAG_IMMUTABLE or FLAG_MUTABLE be specified when creating a PendingIntent.
Strongly consider using FLAG_IMMUTABLE, only use FLAG_MUTABLE if some functionality depends on the PendingIntent being mutable, e.g. if it needs to be used with inline replies or bubbles.

具体报错信息如下所示：

|------------------------------------------------------------------------|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------| | 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 | FATAL EXCEPTION: main Process: com.jsmz, PID: 9336 java.lang.IllegalArgumentException: com.jsmz: Targeting S+ (version 31 and above) requires that one of FLAG_IMMUTABLE or FLAG_MUTABLE be specified when creating a PendingIntent. Strongly consider using FLAG_IMMUTABLE, only use FLAG_MUTABLE if some functionality depends on the PendingIntent being mutable, e.g. if it needs to be used with inline replies or bubbles. at android.app.PendingIntent.checkFlags(PendingIntent.java:375) at android.app.PendingIntent.getBroadcastAsUser(PendingIntent.java:645) at android.app.PendingIntent.getBroadcast(PendingIntent.java:632) at com.serenegiant.usb.USBMonitor.register(USBMonitor.java:170) at com.jsmz.MainActivity.onStart(MainActivity.kt:41) at android.app.Instrumentation.callActivityOnStart(Instrumentation.java:1455) at android.app.Activity.performStart(Activity.java:8273) at android.app.ActivityThread.handleStartActivity(ActivityThread.java:3788) at android.app.servertransaction.TransactionExecutor.performLifecycleSequence(TransactionExecutor.java:221) at android.app.servertransaction.TransactionExecutor.cycleToPath(TransactionExecutor.java:201) at android.app.servertransaction.TransactionExecutor.executeLifecycleState(TransactionExecutor.java:173) at android.app.servertransaction.TransactionExecutor.execute(TransactionExecutor.java:97) at android.app.ActivityThread$H.handleMessage(ActivityThread.java:2288) at android.os.Handler.dispatchMessage(Handler.java:106) at android.os.Looper.loopOnce(Looper.java:210) at android.os.Looper.loop(Looper.java:299) at android.app.ActivityThread.main(ActivityThread.java:8293) at java.lang.reflect.Method.invoke(Native Method) at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:556) at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1045) |

解决方法 {#解决方法}

查了一番资料后，发现如下几个修复的方法：

1. 将项目的targetSdkVersion由31改为30

2. 如果不想改targetSdkVersion，那就在在创建PendingIntent的时候判断当前系统版本，根据不同系统版本创建带有不同flag的PendingIntent，具体代码实现如下：

   |---------------------|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------| | 1 2 3 4 5 6 | PendingIntent pendingIntent; if (android.os.Build.VERSION.SDK_INT >= android.os.Build.VERSION_CODES.S) { pendingIntent = PendingIntent.getActivity(this, 123, intent, PendingIntent.FLAG_IMMUTABLE); } else { pendingIntent = PendingIntent.getActivity(this, 123, intent, PendingIntent.FLAG_ONE_SHOT); } |

3. 直接在项目中依赖下面的库

   |-----------------------|------------------------------------------------------------------------------------------------------------------------------------------------------------| | 1 2 3 4 5 6 7 | dependencies { // For Java implementation 'androidx.work:work-runtime:2.7.1' // For Kotlin implementation 'androidx.work:work-runtime-ktx:2.7.1' } |