意图在从初始活动移动到主活动时生成空对象引用

Question

以前一切正常，现在当我运行我的应用程序时，它开始产生这个错误，我的应用程序一直在崩溃。

此错误不断出现

android.content.Intentandroid.content.ntent.putExtra（java.lang.String， int）'对空对象引用

这是我的飞溅活动代码。

Oncreate方法代码如下

@重写受保护的void onCreate（Bundle savedInstanceState）{

        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_splash);
        FirebaseApp.initializeApp(SplashActivity.this);

        fragmentKey=0;
        intiViews();

        new Handler().postDelayed(() -> {

            redirectingIntent.putExtra("fragmentKey", fragmentKey);
            startActivity(redirectingIntent);
            finish();

        }, 3000);

InitViews方法代码如下所示

    private void intiViews() {
        userRef = FirebaseDatabase.getInstance().getReference(Common.USER_REF);

        mAuth = FirebaseAuth.getInstance();

        //Check User if it exist
        if (mAuth.getCurrentUser() != null) {
            user = mAuth.getCurrentUser();
            CheckUserFromFirebase(user);
        } else {
            redirectingIntent = new Intent(SplashActivity.this, RegisterActivity.class);
            fragmentKey = 0;
        }

    }

    private void CheckUserFromFirebase(final FirebaseUser user) {
        userRef.child(user.getUid()).addListenerForSingleValueEvent(new ValueEventListener() {
            @Override
            public void onDataChange(@NonNull DataSnapshot dataSnapshot) {

                if (dataSnapshot.exists()) {

                    UserModel userModel = dataSnapshot.getValue(UserModel.class);
                    updateUser(userModel);
                    redirectingIntent = new Intent(SplashActivity.this, MainActivity.class);
                    fragmentKey = 0;
                } else {
                    RegisterUser();
                }
            }

            @Override
            public void onCancelled(@NonNull DatabaseError databaseError) {
                Toast.makeText(SplashActivity.this, databaseError.getMessage(), Toast.LENGTH_SHORT).show();
            }
        });
    }

在这里，我使用上载到firebase的用户模型更新我的用户

    private void updateUser(UserModel model) {
        Common.CurrentUser = model;
        Common.CurrentUser.setUid(user.getUid());
    }

如果给定uid没有注册用户，则intent将转到注册活动

    private void RegisterUser() {
        Toast.makeText(this, "No Data found", Toast.LENGTH_SHORT).show();
        redirectingIntent = new Intent(SplashActivity.this, RegisterActivity.class);
        fragmentKey = 1;
    }

}

Answer 1

首先，我会避免延迟处理程序，因为它容易出错；更确切地说，此代码

new Handler().postDelayed(() -> {

        redirectingIntent.putExtra("fragmentKey", fragmentKey);
        startActivity(redirectingIntent);
        finish();

}, 3000);

我会制作另一种方法来处理重定向，并在需要时随时调用它

private void redirectToNextActivity(fragmentKey: Integer) {
    if (redirectingIntent != null ) {
        redirectingIntent.putExtra("fragmentKey", fragmentKey);
        startActivity(redirectingIntent);
        finish();
    }
}

Answer 2

//update by this

 new Handler().postDelayed(() -> {
        if(redirectingIntent != null && fragmentKey != null)    
        {
            redirectingIntent.putExtra("fragmentKey", fragmentKey);
            startActivity(redirectingIntent);
            finish();
        }

    }, 3000);