[英]Add icon in my tabbed activity (android studio)
这里的代码:
SectionsPagerAdapter:
public class SectionsPagerAdapter extends FragmentPagerAdapter {
@StringRes
private static final int[] TAB_TITLES = new int[]{R.string.tab_text_1, R.string.tab_text_2, R.string.tab_text_3, R.string.tab_text_4};
private final Context mContext;
public SectionsPagerAdapter(Context context, FragmentManager fm) {
super(fm);
mContext = context;
}
@Override
public Fragment getItem(int position) {
// getItem is called to instantiate the fragment for the given page.
// Return a PlaceholderFragment (defined as a static inner class below).
//return PlaceholderFragment.newInstance(position + 1);
Fragment fragment = null;
switch(position){
case 0:
fragment = new Fragment1();
break;
case 1:
fragment = new Fragment2();
break;
case 2:
fragment = new Fragment3();
break;
case 3:
fragment = new Fragment4();
break;
}
return fragment;
}
@Nullable
@Override
public CharSequence getPageTitle(int position) {
return mContext.getResources().getString(TAB_TITLES[position]);
}
@Override
public int getCount() {
// Show 4 total pages.
return 4;
}
}
占位符片段:
public class PlaceholderFragment extends Fragment {
private static final String ARG_SECTION_NUMBER = "section_number";
private PageViewModel pageViewModel;
public static PlaceholderFragment newInstance(int index) {
PlaceholderFragment fragment = new PlaceholderFragment();
Bundle bundle = new Bundle();
bundle.putInt(ARG_SECTION_NUMBER, index);
fragment.setArguments(bundle);
return fragment;
}
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
pageViewModel = new ViewModelProvider(this,
new ViewModelProvider.NewInstanceFactory()).get(PageViewModel.class);
int index = 1;
if (getArguments() != null) {
index = getArguments().getInt(ARG_SECTION_NUMBER);
}
pageViewModel.setIndex(index);
}
@Override
public View onCreateView(
@NonNull LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View root = inflater.inflate(R.layout.fragment_main, container, false);
final TextView textView = root.findViewById(R.id.section_label);
pageViewModel.getText().observe(this, new Observer<String>() {
@Override
public void onChanged(@Nullable String s) {
textView.setText(s);
}
});
return root;
}
使用来自 android studio 示例的选项卡式活动与旧版 android studio 库
我想在文字上方添加图标,请写一些例子谢谢。
要在 TabLayout 中的文本上方添加图标,您可以使用 TabItem 的android:icon
属性。 更多信息可以在材料设计文档中找到。 app:tabIconTint
负责设置图标的色调颜色。
xml 中的一个示例如下所示:
<com.google.android.material.tabs.TabLayout
android:id="@+id/tabLayout"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:background="@android:color/darker_gray"
app:tabIndicatorColor="@android:color/holo_orange_dark"
app:tabIndicatorHeight="2dp"
app:tabMode="fixed"
app:tabIconTint="@android:color/white"
app:tabTextColor="@android:color/white">
<com.google.android.material.tabs.TabItem
android:id="@+id/tabItem1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:icon="@drawable/ic_home_24dp"
android:text="Tab1" />
<com.google.android.material.tabs.TabItem
android:id="@+id/tabItem2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:icon="@drawable/ic_chat_24dp"
android:text="Tab2" />
<com.google.android.material.tabs.TabItem
android:id="@+id/tabItem3"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:icon="@drawable/ic_create_24dp"
android:text="Tab3" />
</com.google.android.material.tabs.TabLayout>
或以编程方式:
TabLayout tabLayout = findViewById(R.id.tabLayout);
tabLayout.getTabAt(0).setIcon(R.drawable.ic_home_24dp);
结果:
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