问题

以下是已翻译的内容：

我已经创建了一个安卓应用程序，在其中添加了一个名为profileview.java的活动，在这个活动中，用户可以查看自己或其他用户的个人资料数据。Profileview 活动包含两个片段，即 post 和 likes，在这两个片段中，我需要展示用户发布的帖子和用户点赞的帖子，但是不知道如何将用户的用户ID从 profileview 活动发送到另外两个片段中。

profileviewactivity.class：

public class profileviewActivity extends AppCompatActivity {
    public String userid;
    private ViewPager viewPager;
    private TabLayout tabLayout;
    private settingtabAdopter Tabadapter;

    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_profileview);

        viewPager = (ViewPager) findViewById(R.id.viewpager);
        Tabadapter = new settingtabAdopter(getSupportFragmentManager());
        viewPager.setAdapter(Tabadapter);

        tabLayout = (TabLayout) findViewById(R.id.tablayout);
        tabLayout.setupWithViewPager(viewPager);

        userid = getIntent().getExtras().get("userid").toString();
    }
}

settingadapter.java：

public class settingtabAdopter extends FragmentPagerAdapter {
    public settingtabAdopter(@NonNull FragmentManager fm) {
        super(fm);
    }

    @NonNull
    @Override
    public Fragment getItem(int position) {
        switch (position){
            case 0:
                posttimeline postfragment = new posttimeline();
                Bundle postBundle = new Bundle();
                postBundle.putString("userid", userid);
                postfragment.setArguments(postBundle);
                return postfragment;
            case 1:
                like chatfragment = new like();
                Bundle likeBundle = new Bundle();
                likeBundle.putString("userid", userid);
                chatfragment.setArguments(likeBundle);
                return chatfragment;
            default:
                return null;
        }
    }

    @Override
    public int getCount() {
        return 2;
    }

    @Nullable
    @Override
    public CharSequence getPageTitle(int i) {
        switch (i){
            case 0:
                return "Posts";
            case 1:
                return "Likes";
            default:
                return null;
        }
    }
}

posttimeline.java：

public class posttimeline extends Fragment {
    View posttimelineview;
    private String userid;

    public posttimeline() {
        // Required empty public constructor
    }

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        if (getArguments() != null) {
            userid = getArguments().getString("userid");
        }
    }

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
                             Bundle savedInstanceState) {
        // Inflate the layout for this fragment
        posttimelineview = inflater.inflate(R.layout.fragment_posttimeline, container, false);
        return posttimelineview;
    }
}

like.java：

public class like extends Fragment {
    View Likeview;
    private String userid;

    public like() {
        // Required empty public constructor
    }

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        if (getArguments() != null) {
            userid = getArguments().getString("userid");
        }
    }

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
                             Bundle savedInstanceState) {
        // Inflate the layout for this fragment
        Likeview = inflater.inflate(R.layout.fragment_like, container, false);
        return Likeview;
    }
}

我想要从profileviewactivity将用户ID传递给posttimeline和like片段。

 public class profileviewActivity extends AppCompatActivity {
  public String userid;
  private ViewPager viewPager;
  private TabLayout tabLayout;
  private settingtabAdopter Tabadapter;
   protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_profileview);

    viewPager = (ViewPager) findViewById(R.id.viewpager);
    Tabadapter = new settingtabAdopter(getSupportFragmentManager());
    viewPager.setAdapter(Tabadapter);

    tabLayout = (TabLayout) findViewById(R.id.tablayout);
    tabLayout.setupWithViewPager(viewPager);

    userid = getIntent().getExtras().get("userid").toString();
  }
}

public class settingtabAdopter extends FragmentPagerAdapter {
public settingtabAdopter(@NonNull FragmentManager fm) {
    super(fm);
}

@NonNull
@Override
public Fragment getItem(int position) {
    switch (position){
        case 0:
            posttimeline postfragment = new posttimeline();
            return postfragment;
        case 1:
            like chatfragment = new like();
            return chatfragment;
        default:
            return null;
    }
}

@Override
public int getCount() {
    return 2;
}

@Nullable
@Override
public CharSequence getPageTitle(int i) {
    switch (i){
        case 0:
            return "Posts";
        case 1:
            return "Likes";
        default:
            return null;
    }
}
}

  public class posttimeline extends Fragment {
  View posttimelineview;
   public posttimeline() {
    // Required empty public constructor
}


@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
                         Bundle savedInstanceState) {
    // Inflate the layout for this fragment
   posttimelineview =  inflater.inflate(R.layout.fragment_posttimeline, container, false);
   return posttimelineview;
  }
}

 public class like extends Fragment {
 View Likeview;
  public like() {
    // Required empty public constructor
}


@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
                         Bundle savedInstanceState) {
    // Inflate the layout for this fragment
    Likeview = inflater.inflate(R.layout.fragment_like, container, false);
 return Likeview;
}
}

答案1

得分: 0

1. 在 settingtabAdopter 构造函数中作为参数传递 userid：

public settingtabAdopter(@NonNull FragmentManager fm, String userid)

在 profileviewActivity 的 onCreate 方法中：

Tabadapter = new settingtabAdopter(getSupportFragmentManager(), userid);

2. 在 settingtabAdopter 内部创建私有变量：

private String userid;

在构造函数中进行初始化：

this.userid = userid;

3. 在每个片段中创建私有变量，并添加设置器（对于 posttimeline 和 like 片段）：

private String mUserid;

void setMUserId(String mUserid){
    this.mUserid = mUserid;
}

4. 在 settingtabAdopter 中的 getItem 函数中，在初始化每个片段之后，使用 userid 设置私有变量：

public Fragment getItem(int position) {
    switch (position){
        case 0:
            posttimeline postfragment = new posttimeline();
            postfragment.setMUserId(userid);
            return postfragment;
        case 1:
            like chatfragment = new like();
            chatfragment.setMUserId(userid);
            return chatfragment;
        default:
            return null;
    }
}

    Tabadapter = new settingtabAdopter(getSupportFragmentManager(), userid);

    this.userid = userid