請求運行時權限後，片段變爲空白

Question

我正在處理viewPager的片段，並且在開始爲不同模塊實現運行時權限之前，它正在處理所有事情。

這是我的viewPager適配器。

public class DashboardAdapter extends FragmentStatePagerAdapter { 


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

    @Override 
    public Fragment getItem(int position) { 

     switch (position) { 
     case 0: 
      return FunkyInboxFragment.newInstance(position); 
     case 1: 
      return FunkyTakePhotoFragment.newInstance(position); 
     case 2: 
      return FunkyAddFriendsFragmnet.newInstance(position); 
     default: 
      return FunkyTakePhotoFragment.newInstance(position); 
     } 
    } 

    @Override 
    public int getCount() { 
    return 3; 
    } 

    @Override 
    public Object instantiateItem(ViewGroup container, int position) { 
    Fragment fragment = (Fragment) super.instantiateItem(container, position); 
     return fragment; 
    } 


    @Override 
    public void destroyItem(ViewGroup container, int position, Object object) { 
    } 

} 

這裏不同的片段需要不同的權限，所以我爲它製作了一個共同的活動類。它在同一個片段中工作，但是在向下滑動viewPager片段之後請求一個權限並且在之前片段之前的一個片段變爲空白之後。我已經在適配器上做了所有可能的改變，但沒有得到適當的結果。

請任何人都可以幫忙！

Answer 1

@Override 
public int getCount() { 
return 2; 
} 

//嘗試這可能是它的工作

Answer 2

package com.example.madhavgor.actionbardemolast; 

import android.os.Bundle; 
import android.support.design.widget.TabLayout; 
import android.support.v4.app.Fragment; 
import android.support.v4.app.FragmentManager; 
import android.support.v4.app.FragmentPagerAdapter; 
import android.support.v4.view.ViewPager; 
import android.support.v7.app.AppCompatActivity; 
import android.support.v7.widget.Toolbar; 

import java.util.ArrayList; 
import java.util.List; 

public class MainActivity extends AppCompatActivity { 
private Toolbar toolbar; 
private TabLayout tabLayout; 
private ViewPager viewPager; 
private int[] tabIcons = { 
     R.mipmap.ic_launcher,R.mipmap.ic_launcher_bluetooth 
}; 

@Override 
protected void onCreate(Bundle savedInstanceState) { 
    super.onCreate(savedInstanceState); 
    setContentView(R.layout.activity_main); 
    //toolbar = (Toolbar) findViewById(R.id.toolbar); 
    //setSupportActionBar(toolbar); 

getSupportActionBar().setDisplayHomeAsUpEnabled(true); 

    viewPager = (ViewPager) findViewById(R.id.viewPager); 
    setupViewPager(viewPager); 

    tabLayout = (TabLayout) findViewById(R.id.tabs); 
    tabLayout.setupWithViewPager(viewPager); 
    setupTabIcons(); 
} 

private void setupTabIcons() { 
    tabLayout.getTabAt(0).setIcon(tabIcons[0]); 
    tabLayout.getTabAt(1).setIcon(tabIcons[1]); 
} 

private void setupViewPager(ViewPager viewPager) { 
    ViewPagerAdapter adapter = new ViewPagerAdapter(getSupportFragmentManager()); 
    adapter.addFragment(new OneFragment(), "ONE"); 
    adapter.addFragment(new SecondFragment(), "BLUETOOTH"); 
    adapter.addFragment(new ThirdFragment(), "THREE"); 
    viewPager.setAdapter(adapter); 
} 

class ViewPagerAdapter extends FragmentPagerAdapter { 
    private final List<Fragment> mFragmentList = new ArrayList<>(); 
    private final List<String> mFragmentTitleList = new ArrayList<>(); 

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

    @Override 
    public Fragment getItem(int position) { 
     return mFragmentList.get(position); 
    } 

    @Override 
    public int getCount() { 
     return mFragmentList.size(); 
    } 

    public void addFragment(Fragment fragment, String title) { 
     mFragmentList.add(fragment); 
     mFragmentTitleList.add(title); 
    } 

    @Override 
    public CharSequence getPageTitle(int position) { 
     return mFragmentTitleList.get(position); 
    } 
} 

}

//指這段代碼....可能是它會幫助你..