android空指针问题求助

Question

public class MainActivity extends FragmentActivity implements RadioGroup.OnCheckedChangeListener{

private RadioGroup rg_tab_bar;
private RadioButton channel1;

private FragmentManager fManager;
private MyFragment1 fg1;
private MyFragment2 fg2;
private MyFragment3 fg3;
private MyFragment4 fg4;
private MyFragment5 fg5;

//ViewPager
private ViewPager vpager_one;
private ArrayList<View> aList;
private AdapterViewPager mAdapter;

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

    //ViewPager
    vpager_one=(ViewPager)findViewById(R.id.vpager);
    aList = new ArrayList<View>();
    LayoutInflater li = getLayoutInflater();
    aList.add(li.inflate(R.layout.fg_home_viewpager_view_1,vpager_one,true));
    aList.add(li.inflate(R.layout.fg_home_viewpager_view_2,vpager_one,true));
    aList.add(li.inflate(R.layout.fg_home_viewpager_view_3,vpager_one,true));
    aList.add(li.inflate(R.layout.fg_home_viewpager_view_4,vpager_one,true));
    aList.add(li.inflate(R.layout.fg_home_viewpager_view_5,vpager_one,true));
    mAdapter = new AdapterViewPager(aList);
    vpager_one.setAdapter(mAdapter);//**这是第56行，报错的位置**

    rg_tab_bar = (RadioGroup)findViewById(R.id.rg_tab_bar);
    rg_tab_bar.setOnCheckedChangeListener(this);

    //获取第一个单选按钮，并设置其为选中状态
    channel1=(RadioButton)findViewById(R.id.rb_channel1);
    channel1.setChecked(true);

}

@Override
public void onCheckedChanged(RadioGroup group, int checkedId) {
    fManager = getSupportFragmentManager();
    FragmentTransaction fTransaction = fManager.beginTransaction();
    hideAllFragment(fTransaction);

    switch (checkedId){
        case R.id.rb_channel1:
            if(fg1 == null){
                fg1 = new MyFragment1();
                fTransaction.add(R.id.ly_content,fg1);
            }else{
                fTransaction.show(fg1);
            }
            break;
        case R.id.rb_channel2:
            if(fg2 == null){
                fg2 = new MyFragment2();
                fTransaction.add(R.id.ly_content,fg2);
            }else{
                fTransaction.show(fg2);
            }
            break;
        case R.id.rb_channel3:
            if(fg3 == null){
                fg3 = new MyFragment3();
                fTransaction.add(R.id.ly_content,fg3);
            }else{
                fTransaction.show(fg3);
            }
            break;
        case R.id.rb_channel4:
            if(fg4 == null){
                fg4 = new MyFragment4();
                fTransaction.add(R.id.ly_content,fg4);
            }else{
                fTransaction.show(fg4);
            }
            break;
        case R.id.rb_channel5:
            if(fg5 == null){
                fg5 = new MyFragment5();
                fTransaction.add(R.id.ly_content,fg5);
            }else{
                fTransaction.show(fg5);
            }
            break;
    }
    fTransaction.commit();
}

//隐藏所有Fragment
private void hideAllFragment(FragmentTransaction fTransaction){
    if(fg1 != null)fTransaction.hide(fg1);
    if(fg2 != null)fTransaction.hide(fg2);
    if(fg3 != null)fTransaction.hide(fg3);
    if(fg4 != null)fTransaction.hide(fg4);
    if(fg5 != null)fTransaction.hide(fg5);
}

}

Caused by: java.lang.NullPointerException
at com.rong.shop.myshop.home.MainActivity.onCreate(MainActivity.java:56)

Answer 1

先把AdapterViewPager发出来看看