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要實(shí)現(xiàn)Spinner與ViewPager2的聯(lián)動(dòng),可以通過Spinner的選擇事件來改變ViewPager2的當(dāng)前頁面。
首先,在布局文件中定義一個(gè)Spinner和一個(gè)ViewPager2:
<Spinner
android:id="@+id/spinner"
android:layout_width="wrap_content"
android:layout_height="wrap_content" />
<androidx.viewpager2.widget.ViewPager2
android:id="@+id/viewPager"
android:layout_width="match_parent"
android:layout_height="match_parent" />
接著,在Activity或Fragment中獲取Spinner和ViewPager2實(shí)例,并設(shè)置適配器:
Spinner spinner = findViewById(R.id.spinner);
ViewPager2 viewPager = findViewById(R.id.viewPager);
// 設(shè)置Spinner的數(shù)據(jù)源
String[] items = {"Page 1", "Page 2", "Page 3"};
ArrayAdapter<String> adapter = new ArrayAdapter<>(this, android.R.layout.simple_spinner_item, items);
adapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
spinner.setAdapter(adapter);
// 設(shè)置ViewPager2的適配器
MyAdapter pagerAdapter = new MyAdapter(this);
viewPager.setAdapter(pagerAdapter);
然后,通過Spinner的選擇事件來改變ViewPager2的當(dāng)前頁面:
spinner.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() {
@Override
public void onItemSelected(AdapterView<?> parent, View view, int position, long id) {
viewPager.setCurrentItem(position);
}
@Override
public void onNothingSelected(AdapterView<?> parent) {
// Do nothing
}
});
最后,實(shí)現(xiàn)ViewPager2的適配器MyAdapter:
public class MyAdapter extends FragmentStateAdapter {
public MyAdapter(@NonNull FragmentActivity fragmentActivity) {
super(fragmentActivity);
}
@NonNull
@Override
public Fragment createFragment(int position) {
switch (position) {
case 0:
return new PageFragment("Page 1");
case 1:
return new PageFragment("Page 2");
case 2:
return new PageFragment("Page 3");
default:
return new PageFragment("Unknown");
}
}
@Override
public int getItemCount() {
return 3;
}
}
PageFragment是一個(gè)Fragment,用來顯示ViewPager2的每個(gè)頁面的內(nèi)容:
public class PageFragment extends Fragment {
private String title;
public PageFragment(String title) {
this.title = title;
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
View rootView = inflater.inflate(R.layout.fragment_page, container, false);
TextView textView = rootView.findViewById(R.id.textView);
textView.setText(title);
return rootView;
}
}
這樣就實(shí)現(xiàn)了Spinner與ViewPager2的聯(lián)動(dòng),通過Spinner選擇不同的選項(xiàng),ViewPager2會(huì)自動(dòng)切換到對應(yīng)的頁面。
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