java - getIntent().getSerializableExtra 为空

Question

我有一个 POJO 类实现了 Serializable我想借助 Intent 和 Bundle 将此类的对象传输到另一个 activity。我在传输之前检查了对象，它不是空的。 (正确获取其中一个属性)

放置:

private void onFriendClick(FriendHolder holder, int position) {
        Intent intent = new Intent(context, ProfileActivity.class);
        Bundle extra = new Bundle();
        extra.putSerializable(Consts.KEY_USER_JSON,  friendList.get(position));
        intent.putExtra(Consts.KEY_USER_JSON, extra);
        Log.e("onFriendClick", String.valueOf(friendList.get(position).getName()));
        context.startActivity(intent);
    }

从另一个 Activity 中获取:

 private void setupProfile() {
        Bundle extras = getIntent().getExtras();
        if (extras != null) {
            profile = (ProfileDTO) getIntent().getSerializableExtra(Consts.KEY_USER_JSON);
            Log.e("onFriendClick", String.valueOf(profile.getName()));//NPE this
        } else profile = user.getProfile();
    }

Caused by: java.lang.NullPointerException: Attempt to invoke virtual method 'java.lang.String ru.techmas.getmeet.api.models.ProfileDTO.getName()' on a null object reference at ru.techmas.getmeet.activities.ProfileActivity.setupJsonProfile(ProfileActivity.java:103)

Answer 1

您不需要创建Bundle。尝试做:

private void onFriendClick(FriendHolder holder, int position) {
    Intent intent = new Intent(context, ProfileActivity.class);
    intent.putExtra(Consts.KEY_USER_JSON,  friendList.get(position));
    Log.e("onFriendClick", String.valueOf(friendList.get(position).getName()));
    context.startActivity(intent);
}

private void setupProfile() {
    if (getIntent().getSerializableExtra(Consts.KEY_USER_JSON) != null) {
        profile = (ProfileDTO) getIntent().getSerializableExtra(Consts.KEY_USER_JSON); 
        Log.e("onFriendClick", String.valueOf(profile.getName()));//NPE this
    } else {
        profile = user.getProfile();
    }
}

---

但如果仍然想使用Bundle，您应该替换您发布的代码:

profile = (ProfileDTO) getIntent().getSerializableExtra(Consts.KEY_USER_JSON);

通过:

profile = (ProfileDTO) extras.getSerializableExtra(Consts.KEY_USER_JSON);