小编amo*_*ate的帖子

我有一个导航抽屉和一个抽屉物品.Home是一个带有3个标签的View Pager.当我第一次打开View Pager选项卡时,一切正常,但是当我导航到其中一个Drawer 片段(比如个人资料)后导航回到它时,它是空的(所有三个选项卡)

 import android.content.Intent;
    import android.net.Uri;
    import android.os.Bundle;
    import android.preference.PreferenceActivity;
    import android.support.design.widget.NavigationView;
    import android.support.v4.app.Fragment;
    import android.support.v4.app.FragmentManager;
    import android.support.v4.app.FragmentTransaction;
    import android.support.v4.widget.DrawerLayout;
    import android.support.v7.app.ActionBarDrawerToggle;
    import android.support.v7.app.AppCompatActivity;
    import android.support.v7.widget.Toolbar;
    import android.view.Menu;
    import android.view.MenuItem;
    import android.view.View;
    import android.widget.EditText;
    import android.widget.FrameLayout;
    import android.widget.TextView;

    import com.android.volley.toolbox.ImageLoader;
    import com.android.volley.toolbox.NetworkImageView;
    import com.example.amol.ecom.login.SessionManager;

    import de.hdodenhof.circleimageview.CircleImageView;

    public class MainActivity extends AppCompatActivity implements NavigationView.OnNavigationItemSelectedListener {

        DrawerLayout drawer;
        FrameLayout frameLayout;
        NavigationView navigationView;
        ActionBarDrawerToggle toogle;
        Fragment fragment;
        NetworkImageView networkImageView;
        public TextView nametextview, emailtextview;


        @Override
        protected …