创建一个在所有android片段中显示的按钮

<Button
    android:id="@+id/myButton"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:text="点击我"
    />

public class MyFragment extends Fragment {
    private Button myButton;

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
        View view = inflater.inflate(R.layout.fragment_layout, container, false);
        
        myButton = view.findViewById(R.id.myButton);
        myButton.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                // 在这里编写按钮点击后的逻辑
                Toast.makeText(getActivity(), "按钮被点击了", Toast.LENGTH_SHORT).show();
            }
        });
        
        return view;
    }
}

<FrameLayout
    android:id="@+id/fragmentContainer"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    />

<!-- 在活动的布局文件中使用片段容器 -->

public class MainActivity extends AppCompatActivity {
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        FragmentManager fragmentManager = getSupportFragmentManager();
        FragmentTransaction fragmentTransaction = fragmentManager.beginTransaction();
        MyFragment fragment = new MyFragment();
        fragmentTransaction.add(R.id.fragmentContainer, fragment);
        fragmentTransaction.commit();
    }
}