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：

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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

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：

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    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

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    dependencies {
      // For Java
      implementation 'androidx.work:work-runtime:2.7.1' 
     
      // For Kotlin
      implementation 'androidx.work:work-runtime-ktx:2.7.1'
    }