我有以下代码片段,用于具有选项卡式活动的片段。
import android.os.Bundle;
import android.support.design.widget.TabLayout;
import android.support.v4.view.PagerAdapter;
import android.support.v4.view.ViewPager;
import android.support.v7.app.AppCompatActivity;
import android.support.v7.widget.Toolbar;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
public class LoginSignupActivity extends AppCompatActivity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_loginsignup);
Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
setSupportActionBar(toolbar);
TabLayout tabLayout = (TabLayout) findViewById(R.id.tab_layout);
tabLayout.addTab(tabLayout.newTab().setText("Tab 1"));
tabLayout.addTab(tabLayout.newTab().setText("Tab 2"));
tabLayout.setTabGravity(TabLayout.GRAVITY_FILL);
final ViewPager viewPager = (ViewPager) findViewById(R.id.pager);
final PagerAdapter adapter = new PagerAdapter
(getSupportFragmentManager(), tabLayout.getTabCount()) {
@Override
public int getCount() {
return 0;
}
@Override
public boolean isViewFromObject(View view, Object object) {
return false;
}
};
viewPager.setAdapter(adapter);
viewPager.addOnPageChangeListener(new TabLayout.TabLayoutOnPageChangeListener(tabLayout));
tabLayout.setOnTabSelectedListener(new TabLayout.OnTabSelectedListener() {
@Override
public void onTabSelected(TabLayout.Tab tab) {
viewPager.setCurrentItem(tab.getPosition());
}
@Override
public void onTabUnselected(TabLayout.Tab tab) {
}
@Override
public void onTabReselected(TabLayout.Tab tab) {
}
});
}
}
但是我收到一个错误,
PagerAdapter 中的 PagerAdapter( ) 不能应用于 (android.support.v4.app.FragmentManager, int)
如何解决此错误?任何帮助都会非常有帮助。
类PagerAdapter
没有任何带参数的构造函数。
我认为您应该使用 FragmentPagerAdapter
或 FragmentStatePagerAdapter
但它们也有单参数构造函数,它将FragmentManager
作为参数。
尝试:
FragmentPagerAdapter adapter = new FragmentPagerAdapter(getSupportFragmentManager()) {
@Override
public Fragment getItem(int position) {
return null; // return item from your array or list.
}
@Override
public int getCount() {
return 0; //return size of your array of list.
}
}