Question

我有一个Activity和一个简单的片段，我尝试使用Bundle将数据传递给片段，但是bundle总是为null。我无法弄清问题是什么？！

这是我的Activity类

 public class MainActivity extends AppCompatActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);


        FragmentA fragmentA =new FragmentA();
        Bundle bundle=new Bundle();
        bundle.putString("name","Ahmed Ezzat");
        fragmentA.setArguments(bundle);
    }

    public void showFragment(View view) {

        FragmentA fragmentA=new FragmentA();
        FragmentManager manager=getSupportFragmentManager();
        FragmentTransaction transaction=manager.beginTransaction();
        transaction.add(R.id.dumper,fragmentA,"fragment A");
        transaction.commit();
    }
}

这是我的片段类

public class FragmentA extends Fragment {
TextView textView;
@Nullable
@Override
public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
    View view= inflater.inflate(R.layout.fragment_a,container,false);

    textView= (TextView) view.findViewById(R.id.tv_fragment);


    Bundle bundle = this.getArguments();
    String name = bundle.getString("name");
    if (name!=null){
    textView.setText(name);}

    return view;
}

}

任何帮助？

Answer 1

您从未在position: absolute; bottom: 0;方法中调用setArguments。

showFragment方法中的片段从未使用过。

您可以尝试使用以下代码

onCreate

Answer 2

您可以在构建片段时将数据传递给片段，然后将其传递给事务。

public class FragmentA extends Fragment {
TextView textView;

String message;

public FragmentA(String message){
    this.message = message;
    }

@Nullable
@Override
public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
View view= inflater.inflate(R.layout.fragment_a,container,false);

textView= (TextView) view.findViewById(R.id.tv_fragment);

textView.setText(message);

return view;
}

当附加时，你只需在构造函数中传递它。

将数据传递给Fragment

2 个答案: