Android：为requestcode值选择什么？

Z时代
2024-01-10
分类：问答

诸如此类的方法ActivityCompat.requestPermissions要求我向他们传递一个请求代码，稍后可以在回调中对其进行测试（在本例中为onRequestPermissionsResult）。我应该在requestcode中传递某种最佳实践的值吗？我注意到，如果我只是输入随机数int，有时会出现如下错误：

java.lang.IllegalArgumentException: Can only use lower 8 bits for requestCode 10-25 16:47:43.652 8315-8315/? E/AndroidRuntime: FATAL EXCEPTION: main 10-25 16:47:43.652 8315-8315/? E/AndroidRuntime: Process: my package, PID: 8315 10-25 16:47:43.652 8315-8315/? E/AndroidRuntime: java.lang.RuntimeException: Unable to start activity ComponentInfo{mypackage.myactivity}: java.lang.IllegalArgumentException: Can only use lower 8 bits for requestCode 10-25 16:47:43.652 8315-8315/? E/AndroidRuntime: at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2416) 10-25 16:47:43.652 8315-8315/? E/AndroidRuntime: at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2476) 10-25 16:47:43.652 8315-8315/? E/AndroidRuntime: at android.app.ActivityThread.-wrap11(ActivityThread.java) 10-25 16:47:43.652 8315-8315/? E/AndroidRuntime: at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1344) 10-25 16:47:43.652 8315-8315/? E/AndroidRuntime: at android.os.Handler.dispatchMessage(Handler.java:102) 10-25 16:47:43.652 8315-8315/? E/AndroidRuntime: at android.os.Looper.loop(Looper.java:148) 10-25 16:47:43.652 8315-8315/? E/AndroidRuntime: at android.app.ActivityThread.main(ActivityThread.java:5417) 10-25 16:47:43.652 8315-8315/? E/AndroidRuntime: at java.lang.reflect.Method.invoke(Native Method) 10-25 16:47:43.652 8315-8315/? E/AndroidRuntime: at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:726) 10-25 16:47:43.652 8315-8315/? E/AndroidRuntime: at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:616) 10-25 16:47:43.652 8315-8315/? E/AndroidRuntime: Caused by: java.lang.IllegalArgumentException: Can only use lower 8 bits for requestCode 10-25 16:47:43.652 8315-8315/? E/AndroidRuntime: at android.support.v4.app.FragmentActivity.validateRequestPermissionsRequestCode(FragmentActivity.java:799) 10-25 16:47:43.652 8315-8315/? E/AndroidRuntime: at android.support.v4.app.ActivityCompatApi23.requestPermissions(ActivityCompat23.java:29) 10-25 16:47:43.652 8315-8315/? E/AndroidRuntime: at android.support.v4.app.ActivityCompat.requestPermissions(ActivityCompat.java:316) 10-25 16:47:43.652 8315-8315/? E/AndroidRuntime: at mypackage.myactivity.checkReadPhoneState(PermissionsGatewayActivity.java:48) 10-25 16:47:43.652 8315-8315/? E/AndroidRuntime: at mypackage.myactivity.onCreate(PermissionsGatewayActivity.java:36) 10-25 16:47:43.652 8315-8315/? E/AndroidRuntime: at android.app.Activity.performCreate(Activity.java:6237) 10-25 16:47:43.652 8315-8315/? E/AndroidRuntime: at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1107) 10-25 16:47:43.652 8315-8315/? E/AndroidRuntime: at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2369) 10-25 16:47:43.652 8315-8315/? E/AndroidRuntime: at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2476) 10-25 16:47:43.652 8315-8315/? E/AndroidRuntime: at android.app.ActivityThread.-wrap11(ActivityThread.java) 10-25 16:47:43.652 8315-8315/? E/AndroidRuntime: at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1344) 10-25 16:47:43.652 8315-8315/? E/AndroidRuntime: at android.os.Handler.dispatchMessage(Handler.java:102) 10-25 16:47:43.652 8315-8315/? E/AndroidRuntime: at android.os.Looper.loop(Looper.java:148) 10-25 16:47:43.652 8315-8315/? E/AndroidRuntime: at android.app.ActivityThread.main(ActivityThread.java:5417) 10-25 16:47:43.652 8315-8315/? E/AndroidRuntime: at java.lang.reflect.Method.invoke(Native Method) 10-25 16:47:43.652 8315-8315/? E/AndroidRuntime: at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:726) 10-25 16:47:43.652 8315-8315/? E/AndroidRuntime: at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:616)

回答：

记录发现结果以备将来参考：

以下是来自的代码 android.support.v4.app.FragmentActivity

 /**
 * Modifies the standard behavior to allow results to be delivered to fragments.
 * This imposes a restriction that requestCode be <= 0xffff.
 */
@Override
public void startActivityForResult(Intent intent, int requestCode) {
    if (requestCode != -1 && (requestCode&0xffff0000) != 0) {
        throw new IllegalArgumentException("Can only use lower 16 bits for requestCode");
    }
    super.startActivityForResult(intent, requestCode);
}
@Override
public final void validateRequestPermissionsRequestCode(int requestCode) {
    // We use 16 bits of the request code to encode the fragment id when
    // requesting permissions from a fragment. Hence, requestPermissions()
    // should validate the code against that but we cannot override it as
    // we can not then call super and also the ActivityCompat would call
    // back to this override. To handle this we use dependency inversion
    // where we are the validator of request codes when requesting
    // permissions in ActivityCompat.
    if (!mRequestedPermissionsFromFragment
            && requestCode != -1 && (requestCode & 0xffff0000) != 0) {
        throw new IllegalArgumentException("Can only use lower 16 bits for requestCode");
    }
}