ViewPager和片段没有连接

问题描述：

我试图实现与片段的选项卡视图，但我的片段没有出现。我已经将它与viewpager连接起来，但仍然没有工作。ViewPager和片段没有连接

这是我的MainActivity

package com.example.minkhantlu.timetableapp; 
import android.support.design.widget.TabLayout; 
import android.support.v4.content.ContextCompat; 
import android.support.v4.view.ViewPager; 
import android.support.v7.app.AppCompatActivity; 
import android.os.Bundle; 
import android.view.LayoutInflater; 
import android.widget.TableLayout; 

import com.example.minkhantlu.timetableapp.fragment.ViewPagerAdapter; 

public class HomeActivity extends AppCompatActivity { 
private TabLayout tabLayout; 
private ViewPager viewPager; 
private ViewPagerAdapter viewAdapter; 

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

    tabLayout = (TabLayout) findViewById(R.id.tab_layout); 
    viewPager = (ViewPager) findViewById(R.id.my_view_pager); 

    viewAdapter = new ViewPagerAdapter(getSupportFragmentManager()); 
    viewPager.setAdapter(viewAdapter); 

    TabLayout.Tab mon = tabLayout.newTab(); 
    TabLayout.Tab tue = tabLayout.newTab(); 
    TabLayout.Tab wed = tabLayout.newTab(); 
    TabLayout.Tab thur = tabLayout.newTab(); 
    TabLayout.Tab fri = tabLayout.newTab(); 

    mon.setText("Mon"); 
    tue.setText("Tue"); 
    wed.setText("Wed"); 
    thur.setText("Thur"); 
    fri.setText("Fri"); 

    tabLayout.addTab(mon, 0); 
    tabLayout.addTab(tue, 1); 
    tabLayout.addTab(wed, 2); 
    tabLayout.addTab(thur,3); 
    tabLayout.addTab(fri,4); 

    tabLayout.setTabTextColors(ContextCompat.getColorStateList(this, R.color.colorAccent)); 

    tabLayout.setSelectedTabIndicatorColor(ContextCompat.getColor(this, R.color.colorAccent)); 

    viewPager.addOnPageChangeListener(new TabLayout.TabLayoutOnPageChangeListener(tabLayout)); 
}

}

与此viewPagerAdapter

package com.example.minkhantlu.timetableapp.fragment; 

import android.support.v4.app.Fragment; 
import android.support.v4.app.FragmentManager; 
import android.support.v4.app.FragmentPagerAdapter; 
import android.util.Log; 

public class ViewPagerAdapter extends FragmentPagerAdapter { 


public ViewPagerAdapter(FragmentManager fm) { 
    super(fm); 
} 

@Override 
public Fragment getItem(int position) { 
    return new MondayFragment(); 
} 

@Override 
public int getCount() { 
    return 0; 
}

}

我的片段

package com.example.minkhantlu.timetableapp.fragment; 

import android.content.Context; 
import android.net.Uri; 
import android.os.Bundle; 
import android.support.v4.app.Fragment; 
import android.view.LayoutInflater; 
import android.view.View; 
import android.view.ViewGroup; 

import com.example.minkhantlu.timetableapp.R; 

public class MondayFragment extends Fragment { 

@Override 
public View onCreateView(LayoutInflater inflater, ViewGroup container, 
         Bundle savedInstanceState) { 
    return inflater.inflate(R.layout.fragment_monday, container, false); 
}

尝试

} 片段XML

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" 
xmlns:tools="http://schemas.android.com/tools" 
android:layout_width="match_parent" 
android:layout_height="match_parent" 
tools:context="com.example.minkhantlu.timetableapp.fragment.MondayFragment"> 

<!-- TODO: Update blank fragment layout --> 
<TextView 
    android:layout_width="wrap_content" 
    android:layout_height="wrap_content" 
    android:layout_centerHorizontal="true" 
    android:layout_centerVertical="true" 
    android:text="@string/hello_blank_fragment" /> 

</RelativeLayout>

activity_main.xml中

<?xml version="1.0" encoding="utf-8"?> 
<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android" 
xmlns:tools="http://schemas.android.com/tools" 
android:layout_width="match_parent" 
android:layout_height="match_parent" 
tools:context="com.example.minkhantlu.timetableapp.HomeActivity"> 
<android.support.design.widget.TabLayout 
    android:id="@+id/tab_layout" 
    android:layout_width="match_parent" 
    android:layout_height="wrap_content" 
    android:background="@color/colorPrimaryDark"/> 

<android.support.v4.view.ViewPager 
    android:id="@+id/my_view_pager" 
    android:layout_width="match_parent" 
    android:layout_height="match_parent" 
    android:layout_below="@+id/tab_layout" 
    /> 
</FrameLayout>

但我的片段并没有出现，plz帮助我与此有关。

答

您在getCount()中返回0。在这里您应该返回ViewPager要显示的页面数量。

我知道了THX你的答案！ –

没问题。请记住将此问题标记为已回答。 – Emmanuel

答

你的方法应该返回页面的数量来显示

@Override 
public int getCount() { 
    return 0; 
}

，你可以修改它返回1，因此它会在寻呼机显示页面

@Override 
    public int getCount() { 
     return 1; 
    }

我知道了你的答案！ –

答

在ViewPagerAdapter，可以尝试更改

@Override 
public int getCount() { 
    return 0; 
}

到

@Override 
public int getCount() { 
    return 1; 
}

哦，我知道了，如果我想创建5个片段，它应该是5？ –

答

在ViewPagerAdapter

@Override 
public int getCount() { 
return 1; 
}

和inOncreate

 //set Adapter to view pager 
viewPager.setAdapter(viewAdapter); 

//set tablayout with viewpager 
tabLayout.setupWithViewPager(viewPager); 

// adding functionality to tab and viewpager to manage each other when a page is changed or when a tab is selected 
pager.addOnPageChangeListener(new TabLayout.TabLayoutOnPageChangeListener(tabLayout)); 

     //Setting tabs from adpater 
tabLayout.setTabsFromPagerAdapter(viewAdapter);

或审查教程在

http://www.androidhive.info/2015/09/android-material-design-working-with-tabs/

ViewPager和片段没有连接

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