我工作的一个小应用程序，其中包含的活动与 NavigationDrawer ，我已经放在使用活性片段 FragmentManager 和 FragmentTrancation 。问题是，我有一个的GridView 不出现的片段中。 这是我的主要活动类。

 公共类主要扩展活动{
    DrawerLayout drawerlayout;
    ListView控件LVdrawer;
    ImageView的toplogo;
    查看的rL;
    FragmentManager调频= getFragmentManager（）;
    FragmentTransaction反式= FM.beginTransaction（）;
    @覆盖
    保护无效的onCreate（包savedInstanceState）{
        // TODO自动生成方法存根
        super.onCreate（savedInstanceState）;
        的setContentView（R.layout.navigation_drawer）;
        AddApps Aapps =新AddApps（）;
        drawerlayout =（DrawerLayout）findViewById（R.id.drawer_layout）;
        LVdrawer =（ListView控件）findViewById（R.id.left_drawer）;
        LVdrawer.setAdapter（新CustomAdapter（这一点，1））;
        Trans.add（R.id.content_frame，Aapps，AddAppsF）;
        Trans.addToBackStack（AddApps）;
        Trans.commit（）;
    }
 

片段类：

 公共类AddApps扩展片段{
        GridView的网格;
    @覆盖
    公共查看onCreateView（LayoutInflater充气，容器的ViewGroup，
            捆绑savedInstanceState）{
        // TODO自动生成方法存根
        查看addapp = inflater.inflate（R.layout.addbusiness，集装箱，假）;
            格=（GridView控件）addapp.findViewById（R.id.gridView1）;
        返回addapp;

    }
    @覆盖
        公共无效onActivityCreated（包savedInstanceState）{
            // TODO自动生成方法存根
            super.onActivityCreated（savedInstanceState）;
            grid.setAdapter（新Customadapter（getActivity（）））;
        }
    }
    类Customadapter扩展了BaseAdapter {
        ArrayList的＆LT;行＆GT;行;
        的String []的名称;
        语境℃;
        INT [] IDS;
        私人LayoutInflater充气;

        公共Customadapter（上下文C）{
            // TODO自动生成构造函数存根
            this.c = C;
            充气= LayoutInflater.from（C）;

            行=新的ArrayList＆LT;行＆GT;（）;
                名称=新DrawerData（）getnames（）。
                IDS =新DrawerData（）getids（）。

            的for（int i = 0; I＆LT; ids.length;我++）{
                row.add（新行（名称[I]，IDS [I]））;
            }
        }

        @覆盖
        公众诠释getCount将（）{
            // TODO自动生成方法存根
            返回row.size（）;
        }

        @覆盖
        公共对象的getItem（INT位置）{
            // TODO自动生成方法存根
            返回row.get（位置）;
        }

        @覆盖
        众长getItemId（INT位置）{
            // TODO自动生成方法存根
            返回的位置;
        }

        @覆盖
        公共查看getView（INT位置，查看convertView，ViewGroup中父）{
            // TODO自动生成方法存根
            ViewHolder1支架=无效;
            查看singleview = convertView;

            如果（convertView == NULL）{
                singleview = inflater.inflate（R.layout.singleapp，父母，假）;
                持有人=新ViewHolder1（singleview）;
                singleview.setTag（保持器）;
            }

            其他 {
                支架=（ViewHolder1）singleview.getTag（）;

            }
            行RR = row.get（位置）;
            holder.img.setImageResource（rr.imageid）;
            holder.det.setText（rr.names）;

            返回singleview;
        }

    }

    类ViewHolder1 {
        ImageView的IMG;
        TextView的DET;

        ViewHolder1（视图v）{
            IMG =（ImageView的）v.findViewById（R.id.detail_logo）;
            DET =（TextView中）v.findViewById（R.id.detail）;
        }
    }
 

解决方案

你不尊重活动的生命周期。当你这样做

  FragmentManager FM = getFragmentManager（）;
FragmentTransaction反式= FM.beginTransaction（）;
 

方法前的onCreate 被调用，你没有在活动正确创建。

此举code到的onCreate 方法：

  @覆盖
保护无效的onCreate（包savedInstanceState）{
    // TODO自动生成方法存根
    super.onCreate（savedInstanceState）;
    的setContentView（R.layout.navigation_drawer）;
    AddApps Aapps =新AddApps（）;
    drawerlayout =（DrawerLayout）findViewById（R.id.drawer_layout）;
    LVdrawer =（ListView控件）findViewById（R.id.left_drawer）;
    LVdrawer.setAdapter（新CustomAdapter（这一点，1））;

    FragmentManager调频= getFragmentManager（）;
    FragmentTransaction反式= FM.beginTransaction（）;

    Trans.add（R.id.content_frame，Aapps，AddAppsF）;
    Trans.addToBackStack（AddApps）;
    Trans.commit（）;
}
 

I am working on a small application which contains Activity with NavigationDrawer, and i have placed a fragment on that activity using FragmentManager and FragmentTrancation. Problem is, I have a GridView inside a fragment which doesn't appear. Here is my Main Activity Class.

public class Main extends Activity {
    DrawerLayout drawerlayout;
    ListView LVdrawer;
    ImageView toplogo;
    View rL;
    FragmentManager FM = getFragmentManager();
    FragmentTransaction Trans = FM.beginTransaction();
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        // TODO Auto-generated method stub
        super.onCreate(savedInstanceState);
        setContentView(R.layout.navigation_drawer);
        AddApps Aapps = new AddApps();
        drawerlayout = (DrawerLayout) findViewById(R.id.drawer_layout);
        LVdrawer = (ListView) findViewById(R.id.left_drawer);
        LVdrawer.setAdapter(new CustomAdapter(this, 1));
        Trans.add(R.id.content_frame, Aapps, "AddAppsF");
        Trans.addToBackStack("AddApps");
        Trans.commit();
    }

Fragment Class:

 public class AddApps extends Fragment {
        GridView grid;
    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
            Bundle savedInstanceState) {
        // TODO Auto-generated method stub
        View addapp=inflater.inflate(R.layout.addbusiness, container, false);
            grid=(GridView) addapp.findViewById(R.id.gridView1);
        return addapp;

    }
    @Override
        public void onActivityCreated(Bundle savedInstanceState) {
            // TODO Auto-generated method stub
            super.onActivityCreated(savedInstanceState);
            grid.setAdapter(new Customadapter(getActivity()));
        }
    }
    class Customadapter extends BaseAdapter {
        ArrayList<Row> row;
        String[] names;
        Context c;
        int[] ids;
        private LayoutInflater inflater;

        public Customadapter(Context c) {
            // TODO Auto-generated constructor stub
            this.c = c;
            inflater=LayoutInflater.from(c);

            row = new ArrayList<Row>();
                names = new DrawerData().getnames();
                ids = new DrawerData().getids();

            for (int i = 0; i < ids.length; i++) {
                row.add(new Row(names[i], ids[i]));
            }
        }

        @Override
        public int getCount() {
            // TODO Auto-generated method stub
            return row.size();
        }

        @Override
        public Object getItem(int position) {
            // TODO Auto-generated method stub
            return row.get(position);
        }

        @Override
        public long getItemId(int position) {
            // TODO Auto-generated method stub
            return position;
        }

        @Override
        public View getView(int position, View convertView, ViewGroup parent) {
            // TODO Auto-generated method stub
            ViewHolder1 holder = null;
            View singleview = convertView;

            if (convertView == null) {
                singleview = inflater.inflate(R.layout.singleapp, parent, false);
                holder = new ViewHolder1(singleview);
                singleview.setTag(holder);
            }

            else {
                holder = (ViewHolder1) singleview.getTag();

            }
            Row rr = row.get(position);
            holder.img.setImageResource(rr.imageid);
            holder.det.setText(rr.names);

            return singleview;
        }

    }

    class ViewHolder1 {
        ImageView img;
        TextView det;

        ViewHolder1(View v) {
            img = (ImageView) v.findViewById(R.id.detail_logo);
            det = (TextView) v.findViewById(R.id.detail);
        }
    }

You're not respecting the Activity lifecycle. When you do this

FragmentManager FM = getFragmentManager();
FragmentTransaction Trans = FM.beginTransaction();

before the method onCreate being called, you don't have the Activity properly created.

Move that code to the onCreate method:

@Override
protected void onCreate(Bundle savedInstanceState) {
    // TODO Auto-generated method stub
    super.onCreate(savedInstanceState);
    setContentView(R.layout.navigation_drawer);
    AddApps Aapps = new AddApps();
    drawerlayout = (DrawerLayout) findViewById(R.id.drawer_layout);
    LVdrawer = (ListView) findViewById(R.id.left_drawer);
    LVdrawer.setAdapter(new CustomAdapter(this, 1));

    FragmentManager FM = getFragmentManager();
    FragmentTransaction Trans = FM.beginTransaction();

    Trans.add(R.id.content_frame, Aapps, "AddAppsF");
    Trans.addToBackStack("AddApps");
    Trans.commit();
}