Calling startActivity() from outside of an Activity context requires the FLAG_ ACTIVITY_ NEW_ TASK flag

Recently, I was working on a project related to human face recognition , call context.startActivity(intent) Method , An error is as follows ：
android.util.AndroidRuntimeException: Calling startActivity() from outside of an Activity context requires the FLAG_ACTIVITY_NEW_TASK flag. Is this really what you want?

analysis ：Activity Inherited from Context, see Context.startActivity(Intent, Bundle), The following figure is part of the method annotation ：

explain ：

If this method is not Activity Of Context call , So this Intent Must include Intent.FLAG_ACTIVITY_NEW_TASK This flag, If it is Activity Of Context call , You don't need to .

This is because , If not by an existing Activity start-up , There is no existing stack to replace the new Activity, So it needs to be in its own stack . So you need this Intent Set startup parameters Intent.FLAG_ACTIVITY_NEW_TASK This flag, Make the new Activity In its own stack .

Because I am in React-native Through the custom module , Give Way react-native call android The native interface (Android native and React-native Call each other and pass parameters _ Dried old salted fish blog -CSDN Blog ), This custom module The initialization is as follows ：

  Definition Context When you use

private ReactApplicationContext mContext;

In use , First judge ReactApplicationContext Is there any currentActivity, If there is , Get it Activity object , Then start the new through this object Activity.

if (mContext.hasCurrentActivity()){
               Activity currentActivity = mContext.getCurrentActivity();
               Log.d(TAG, "currentActivity: " + currentActivity);
               WbCloudFaceVerifySdk.getInstance().startWbFaceVerifySdk(currentActivity, new WbCloudFaceVerifyResultListener() {
                  @Override
                  public void onFinish(WbFaceVerifyResult result) {
                     if (result != null) {
                        if (result.isSuccess()) {
                           Log.d(TAG, " Brush your face successfully ！");
                        } else {
                           Log.d(TAG, " Face brushing failed ！");
                        }
                     }
                     // After brushing your face , Release resources in time 
                     WbCloudFaceVerifySdk.getInstance().release();
                  }
               });
            }
//            callback.invoke(STATUS_SUCCESS);
         }

Why not define it at the beginning of initialization mContext by Activity Of Context, Please refer to the following instructions (ReactContextBaseJavaModule getCurrentActivity Return empty question _ Dried old salted fish blog -CSDN Blog )