微信界面安卓代码

以下是一个简单的微信界面的安卓代码示例，包括一个主Activity和三个Fragment：聊天列表、通讯录和发现。

MainActivity.java:

public class MainActivity extends AppCompatActivity {

    private FrameLayout frameLayout;

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

        frameLayout = findViewById(R.id.frame_layout);

        // 默认显示聊天列表Fragment
        getSupportFragmentManager().beginTransaction()
                .replace(R.id.frame_layout, new ChatListFragment())
                .commit();
    }
    
    // 切换到聊天列表Fragment
    public void switchToChatList() {
        getSupportFragmentManager().beginTransaction()
                .replace(R.id.frame_layout, new ChatListFragment())
                .addToBackStack(null)
                .commit();
    }

    // 切换到通讯录Fragment
    public void switchToContacts() {
        getSupportFragmentManager().beginTransaction()
                .replace(R.id.frame_layout, new ContactsFragment())
                .addToBackStack(null)
                .commit();
    }

    // 切换到发现Fragment
    public void switchToDiscover() {
        getSupportFragmentManager().beginTransaction()
                .replace(R.id.frame_layout, new DiscoverFragment())
                .addToBackStack(null)
                .commit();
    }
}

activity_main.xml:

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

ChatListFragment.java:

public class ChatListFragment extends Fragment {

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

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

        // TODO：显示聊天列表

        return view;
    }
}

fragment_chat_list.xml:

<LinearLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical"
    android:layout_width="match_parent"
    android:layout_height="match_parent">

    <!-- TODO：聊天列表UI -->

</LinearLayout>

ContactsFragment.java:

public class ContactsFragment extends Fragment {

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

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

        // TODO：显示通讯录列表

        return view;
    }
}

fragment_contacts.xml:

<LinearLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical"
    android:layout_width="match_parent"
    android:layout_height="match_parent">

    <!-- TODO：通讯录列表UI -->

</LinearLayout>

DiscoverFragment.java:

public class DiscoverFragment extends Fragment {

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

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

        // TODO：显示发现页面内容

        return view;
    }
}

fragment_discover.xml:

<LinearLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical"
    android:layout_width="match_parent"
    android:layout_height="match_parent">

    <!-- TODO：发现页面UI -->

</LinearLayout>

以上代码仅为示例，具体实现需要根据实际需求进行调整。