[英]Tablayout Title doesn't appear
我有一個 Tablayout 通過 ViewPager 和適配器顯示三個片段,問題是標題沒有出現:MainActivity.java:
package com.asd.tab3;
import android.os.Bundle;
import androidx.appcompat.app.AppCompatActivity;
import androidx.viewpager.widget.ViewPager;
import com.google.android.material.tabs.TabLayout;
public class MainActivity extends AppCompatActivity {
TabLayout tb;
ViewPager vp;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
tb=findViewById(R.id.tab1);
vp=findViewById(R.id.viwp);
final MyAdapter adapter = new MyAdapter(this,getSupportFragmentManager(), tb.getTabCount());
vp.setAdapter(adapter);
tb.setupWithViewPager(vp);
}
}
MyAdapter.java
package com.asd.tab3;
import android.content.Context;
import androidx.fragment.app.Fragment;
import androidx.fragment.app.FragmentManager;
import androidx.fragment.app.FragmentPagerAdapter;
public class MyAdapter extends FragmentPagerAdapter {
private Context myContext;
int totalTabs;
public MyAdapter(Context context, FragmentManager fm, int totalTabs) {
super(fm);
myContext = context;
this.totalTabs = totalTabs;
}
// this is for fragment tabs
@Override
public Fragment getItem(int position) {
switch (position) {
case 0:
BlankFragment homeFragment = new BlankFragment();
return homeFragment;
case 1:
BlankFragment2 sportFragment = new BlankFragment2();
return sportFragment;
case 2:
BlankFragment3 movieFragment = new BlankFragment3();
return movieFragment;
default:
return null;
}
}
// this counts total number of tabs
@Override
public int getCount() {
return totalTabs;
}
}
雷姆:我的問題與這篇文章不同:( TabLayout 中的標題不出現)
您應該在FragmentPageAdapter
MyAdapter
(在您的情況下為 MyAdapter )中覆蓋方法getPageTitle()
) 。
* This method may be called by the ViewPager to obtain a title string
* to describe the specified page. This method may return null
* indicating no title for this page. The default implementation returns
* null.
*
* @param position The position of the title requested
* @return A title for the requested page
fun getPageTitle(position: Int): CharSequence?
目前,標題沒有出現,因為它使用該方法的默認實現,始終返回 null。
我通過使用 (getTabAt(index).setText = "Some Text";) 解決了它
tb.getTabAt(0).setText("First");
聲明:本站的技術帖子網頁,遵循CC BY-SA 4.0協議,如果您需要轉載,請注明本站網址或者原文地址。任何問題請咨詢:yoyou2525@163.com.