android viewswitcher 能嵌套多个吗

在Android中，ViewSwitcher本身不能直接嵌套多个。ViewSwitcher是一个容器，用于在两个子视图之间切换，它只支持两个子视图。如果你想要实现多个视图之间的切换，可以使用嵌套的ViewFlipper或者使用ViewPager结合Fragment来实现。

使用ViewFlipper嵌套：

<ViewFlipper android:id="@+id/viewFlipper" android:layout_width="match_parent" android:layout_height="match_parent">
    <TextView
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:text="View 1" />
    <TextView
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:text="View 2" />
    <TextView
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:text="View 3" />
</ViewFlipper>

然后在Activity中设置切换动画：

ViewFlipper viewFlipper = findViewById(R.id.viewFlipper);
viewFlipper.setInAnimation(AnimationUtils.loadAnimation(this, R.anim.slide_in_left));
viewFlipper.setOutAnimation(AnimationUtils.loadAnimation(this, R.anim.slide_out_right));

使用ViewPager结合Fragment：

首先，创建一个Fragment类，例如ViewPagerFragment，并在其中添加一个子视图：

public class ViewPagerFragment extends Fragment {
    private static final String ARG_VIEW_TYPE = "view_type";

    public static ViewPagerFragment newInstance(int viewType) {
        ViewPagerFragment fragment = new ViewPagerFragment();
        Bundle args = new Bundle();
        args.putInt(ARG_VIEW_TYPE, viewType);
        fragment.setArguments(args);
        return fragment;
    }

    @Nullable
    @Override
    public View onCreateView(@NonNull LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
        View view = inflater.inflate(R.layout.fragment_view_pager, container, false);
        switch (getArguments().getInt(ARG_VIEW_TYPE)) {
            case 1:
                view.setBackgroundColor(Color.RED);
                break;
            case 2:
                view.setBackgroundColor(Color.GREEN);
                break;
            case 3:
                view.setBackgroundColor(Color.BLUE);
                break;
        }
        return view;
    }
}

接下来，在Activity中设置ViewPager：

<androidx.viewpager.widget.ViewPager
    android:id="@+id/viewPager"
    android:layout_width="match_parent"
    android:layout_height="match_parent" />

然后在Activity中设置适配器：

public class MainActivity extends AppCompatActivity {
    private ViewPager viewPager;

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

        viewPager = findViewById(R.id.viewPager);
        setupViewPager();
    }

    private void setupViewPager() {
        ViewPagerAdapter adapter = new ViewPagerAdapter(getSupportFragmentManager());
        adapter.addFragment(ViewPagerFragment.newInstance(1), "View 1");
        adapter.addFragment(ViewPagerFragment.newInstance(2), "View 2");
        adapter.addFragment(ViewPagerFragment.newInstance(3), "View 3");
        viewPager.setAdapter(adapter);
    }
}

最后，创建一个适配器ViewPagerAdapter，继承自FragmentPagerAdapter或FragmentStatePagerAdapter：

public class ViewPagerAdapter extends FragmentPagerAdapter {
    private final List<Fragment> fragmentList = new ArrayList<>();
    private final List<String> fragmentTitleList = new ArrayList<>();

    public ViewPagerAdapter(FragmentManager manager) {
        super(manager, BEHAVIOR_RESUME_ONLY_CURRENT_FRAGMENT);
    }

    @NonNull
    @Override
    public Fragment getItem(int position) {
        return fragmentList.get(position);
    }

    @Override
    public int getCount() {
        return fragmentList.size();
    }

    public void addFragment(Fragment fragment, String title) {
        fragmentList.add(fragment);
        fragmentTitleList.add(title);
    }

    @Nullable
    @Override
    public CharSequence getPageTitle(int position) {
        return fragmentTitleList.get(position);
    }
}

这样，你就可以实现多个视图之间的切换了。

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