如何在方法void中初始化最终变量布尔数组

Question

my application will check whether the play protect settings are activated or not.

public static boolean checkGooglePlayProtectSettings(Context context){
    final boolean[] enabled = new boolean[]{false};
    try{
        SafetyNet.getClient(context).isVerifyAppsEnabled().addOnCompleteListener(new OnCompleteListener<SafetyNetApi.VerifyAppsUserResponse>() {

            @Override
                    public void onComplete(@NonNull Task<SafetyNetApi.VerifyAppsUserResponse> task) {
                        if(task.isSuccessful()){
                            SafetyNetApi.VerifyAppsUserResponse result = task.getResult();
                            if(result != null){
                                if(result.isVerifyAppsEnabled()){
                                    enabled[0] = true;
                                }else{
                                    enabled[0] = false;

                                }
                            }
                        }else{
                            Log.e("GoogleProtectPermission", "A general error occurred.");
                        }
                    }
                });
    }catch (Exception e){
        e.printStackTrace();
    }

    if (enabled[0]){
        Log.d("GoogleProtectPermission", "Is enabled");
    }else {
        Log.d("GoogleProtectPermission", "Is disabled");
    }
    return false;
}

in this case I tried the final results to log, but always not active in the log results, how to get good results to check whether play prtoect is active or not?

Answer 1

The isVerifyAppsEnabled() method is asynchronous, it calls the OnCompleteListener 's onComplete method to notify when the result is ready.

It's likely that this block is executed before the OnCompleteListener is fired, so the enabled[0] value remains the same at this point.

if (enabled[0]) {
    Log.d("GoogleProtectPermission", "Is enabled");
} else {
    Log.d("GoogleProtectPermission", "Is disabled");
}

Since there's no synchronous method to get the result, you'll probably have to change your approach someway to take account for this asynchronicity and perform dependent operations when the callback results are ready or perform a blocking wait until the Task returned by isVerifyAppsEnabled is completed.

Also, disregarding the question, in your current code there seems to be little point in using boolean array instead of just a boolean for this, and this

if(result.isVerifyAppsEnabled()) {
    enabled[0] = true;
} else {
    enabled[0] = false;
}

can be simplified to this enabled[0] = result.isVerifyAppsEnabled()

Answer 2

You could do like this:

final StringBuilder sb = new StringBuilder();
...
if(result.isVerifyAppsEnabled()){
    sb.append("good");
}else{
    sb.append("bad");
}
...
if(sb.toString().equals("good")){
    Log.d("GoogleProtectPermission", "Is enabled");
}
if(sb.toString().equals("bad")){
    Log.d("GoogleProtectPermission", "Is disabled");
}

Edited: Yes, as comment points, My answer is wrong. so there are two ways:

1 directly output log info

   if(result.isVerifyAppsEnabled()){
       Log.d("GoogleProtectPermission", "Is enabled");
    }else{
        Log.d("GoogleProtectPermission", "Is disabled");
    }

2 using interface callback

   public interface Callback {  //add an interface 
        void onResponse(String message);
    }

    final StringBuilder sb = new StringBuilder();
    ...
    if(result.isVerifyAppsEnabled()){
        sb.append("good");
    }else{
        sb.append("bad");
    }
    callback.onResponse(sb.toString()); //add this line

and subscribe the interface in some place.