Android Studio工具栏标题更新错误，其中从一个片段到另一个片段的反向堆栈

时间：2018-11-27 17:14:49

标签： android android-layout android-fragments back

我有一个fragment_home，其中有6个按钮，这6个按钮具有自己的链接（以显示类似注册表格的内容），但是我有这6个按钮中的一个按钮，该按钮链接到另一个片段，并且具有带视图分页器的选项卡式视图当我按回时，任何其他片段的标题都会更新，但是当我进入链接到选项卡式视图的按钮时，它将使工具栏标题保持不变，除非我退出并再次打开，否则它将不会在那里更新应用程序  欲了解更多信息，我添加了一些描述如下的照片 不久 应用程序启动时  first image 当我点击用户时 second image 当我点击返回 third image 当我单击注册自己时，它会正确更新标题 fourth image 它再次正确更新，但现在当我按回 last image 它不会更新标题

主导航类

    package com.example.arada_tech.myapplication;



import android.nfc.Tag;
import android.support.v4.app.FragmentManager;
import android.content.Intent;
import android.os.Bundle;
import android.os.Handler;
import android.support.design.widget.FloatingActionButton;
import android.support.design.widget.NavigationView;
import android.support.design.widget.Snackbar;

import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentTransaction;
import android.support.v4.view.GravityCompat;
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.util.Log;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.widget.Toast;

public class Navi extends AppCompatActivity
        implements NavigationView.OnNavigationItemSelectedListener {

    Fragment fragment1;
    DrawerLayout drawer;
    Tag tag;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_navi);
        Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
        setSupportActionBar(toolbar);

//        FloatingActionButton fab = (FloatingActionButton) findViewById(R.id.fab);
//        fab.setOnClickListener(new View.OnClickListener() {
//            @Override
//            public void onClick(View view) {
//                Snackbar.make(view, "Replace with your own action", Snackbar.LENGTH_LONG)
//                        .setAction("Action", null).show();
//            }
//        });

         drawer = (DrawerLayout) findViewById(R.id.drawer_layout);
        ActionBarDrawerToggle toggle = new ActionBarDrawerToggle(
                this, drawer, toolbar, R.string.navigation_drawer_open, R.string.navigation_drawer_close);
        drawer.addDrawerListener(toggle);
        toggle.syncState();

        NavigationView navigationView = (NavigationView) findViewById(R.id.nav_view);
        navigationView.setNavigationItemSelectedListener(this);
        Displayfragment(R.id.nav_home);
    }
    boolean doubleBackToExitPressedOnce=false;
//    @Override
//    public void onBackPressed() {
//
//        DrawerLayout drawer = (DrawerLayout) findViewById(R.id.drawer_layout);
//        if (drawer.isDrawerOpen(GravityCompat.START)) {
//            drawer.closeDrawer(GravityCompat.START);
//
//        } else {
//            if (getFragmentManager().getBackStackEntryCount() > 1) {
//                getFragmentManager().popBackStack();
//            } else if (!doubleBackToExitPressedOnce) {
//                this.doubleBackToExitPressedOnce = true;
//                Toast.makeText(this,"Please click BACK again to exit.", Toast.LENGTH_SHORT).show();
//                new Handler().postDelayed(new Runnable() {
//                    @Override
//                    public void run() {
//                        doubleBackToExitPressedOnce = false;
//                    }
//                }, 2000);
//            }
//            else {
//                System.exit(1);
////                 super.onBackPressed();
//            }
//
//        }
//    }

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        // Inflate the menu; this adds items to the action bar if it is present.
        getMenuInflater().inflate(R.menu.navi, menu);
        return true;
    }

    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        // Handle action bar item clicks here. The action bar will
        // automatically handle clicks on the Home/Up button, so long
        // as you specify a parent activity in AndroidManifest.xml.
        int id = item.getItemId();

        //noinspection SimplifiableIfStatement
        if (id == R.id.action_settings) {
            return true;
        }

        return super.onOptionsItemSelected(item);
    }
    private void Displayfragment(int id)
    {
        Fragment fragment=null;
        switch(id) {
            case R.id.nav_home:
                fragment = new Fragment_Home();
                break;
            case R.id.nav_addbirr:
//                fragment = new Fragment_addbirr();
                break;
            case R.id.nav_adduser:
                fragment = new Fragment_addusers();
                break;
            case R.id.nav_followorders:
//                fragment = new Fragment_followorders();
                break;
            case R.id.nav_Deleteusers:
//                fragment = new Fragment_deleteusers();
                break;
            case R.id.nav_setings:
//                fragment = new Fragment_settings();
                Intent tin=new Intent(getApplicationContext(),Menus.class);
                startActivity(tin);
                break;
        }

        if(fragment!=null)
        {
            FragmentManager fragmentManager=getSupportFragmentManager();
            FragmentTransaction ft= fragmentManager.beginTransaction();
            fragment1=fragmentManager.findFragmentById(R.id.nav_home);
                ft.replace(R.id.myframelayout,fragment);
//                ft.addToBackStack(fragment.getClass().getName());
            ft.addToBackStack(fragment.getClass().getName());
            ft.commit();



        }

        DrawerLayout drawer = (DrawerLayout) findViewById(R.id.drawer_layout);
        drawer.closeDrawer(GravityCompat.START);
    }

    @SuppressWarnings("StatementWithEmptyBody")
    @Override
    public boolean onNavigationItemSelected(MenuItem item) {

        Displayfragment(item.getItemId());
         return true;
    }
    public void setActionBarTitle(String title) {
        getSupportActionBar().setTitle(title);
    }

}

我的Fragment_home 

package com.example.arada_tech.myapplication;

import android.app.Activity;
import android.content.Intent;
import android.graphics.drawable.AnimationDrawable;
import android.os.Bundle;
import android.support.annotation.Nullable;
import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentManager;
import android.support.v4.app.FragmentTransaction;
import android.support.v7.app.AppCompatActivity;
import android.support.v7.widget.CardView;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ImageView;
import android.widget.RelativeLayout;

public class Fragment_Home extends Fragment implements View.OnClickListener {
    CardView im,in,du,ro;
    Fragment fragment=null;


    @Nullable
    @Override
    public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, Bundle savedInstanceState) {

        getActivity().setTitle("home");

        return inflater.inflate(R.layout.mukera,container,false);


    }


    @Override
    public void onViewCreated(View view, @Nullable Bundle savedInstanceState) {

        im= (CardView) view.findViewById(R.id.card_user);
        ro= (CardView) view.findViewById(R.id.card_registerown);
        im.setOnClickListener(this);
        ro.setOnClickListener(this);
        in= (CardView) view.findViewById(R.id.card_order);
        in.setOnClickListener(this);
        du= (CardView) view.findViewById(R.id.card_deleteuser);
        du.setOnClickListener(this);

        super.onViewCreated(view, savedInstanceState);

    }

    @Override
    public void onClick(View v) {

        if(v==im){
            fragment = new Fragment_addusers();
            FragManager();

        }
        else if (v==in)
        {
//            fragment = new Fragment_followorders();
            FragManager();
        }
        else if (v==du)
        {
//            fragment = new Fragment_deleteusers();
            FragManager();
        }
        else if (v==ro)
        {
            fragment = new Fragment_registerown();
            FragManager();
        }
    }
    public  void FragManager()
    {
        if(fragment!=null)

        {

            FragmentManager fragmentManager=getFragmentManager();
            FragmentTransaction ft= fragmentManager.beginTransaction();
            ft.replace(R.id.myframelayout,fragment);
            ft.addToBackStack(null);
            ft.commit();
        }
    }
}

和我的注册片段

package com.example.arada_tech.myapplication;


import android.content.Context;
import android.os.Bundle;
import android.os.Handler;
import android.support.annotation.Nullable;
import android.support.design.widget.TabLayout;

import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentActivity;
import android.support.v4.view.ViewPager;
import android.support.v7.app.AppCompatActivity;
import android.support.v7.widget.Toolbar;
import android.view.LayoutInflater;
import android.view.Menu;
import android.view.MenuInflater;
import android.view.MenuItem;
import android.view.View;
import android.view.ViewGroup;

public class Fragment_registerown extends Fragment {
    Context context;

    @Nullable
    @Override
    public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, Bundle savedInstanceState) {
        getActivity().setTitle("register Own");
setHasOptionsMenu(true);
        return inflater.inflate(R.layout.mainslide,container,false);

    }

    @Override
    public void onViewCreated(View view, @Nullable Bundle savedInstanceState) {
        Toolbar toolbar = (Toolbar) view.findViewById(R.id.toolbar);
        ((AppCompatActivity)getActivity()).setSupportActionBar(toolbar);

        TabLayout tabLayout = (TabLayout) view.findViewById(R.id.tab_layout);
        tabLayout.addTab(tabLayout.newTab().setText("View"));
        tabLayout.addTab(tabLayout.newTab().setText("Create"));
        tabLayout.addTab(tabLayout.newTab().setText("Edit"));
        tabLayout.setTabGravity(TabLayout.GRAVITY_FILL);

        final ViewPager viewPager = (ViewPager) view.findViewById(R.id.pager);
        final ViewAdapter adapter = new ViewAdapter(((FragmentActivity) getContext()).getSupportFragmentManager(), tabLayout.getTabCount());

        viewPager.setAdapter(adapter);

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

        tabLayout.setOnTabSelectedListener(new TabLayout.OnTabSelectedListener() {

            @Override

            public void onTabSelected(TabLayout.Tab tab) {
                viewPager.setCurrentItem(tab.getPosition());


            }
            @Override

            public void onTabUnselected(TabLayout.Tab tab) {

            }



            @Override

            public void onTabReselected(TabLayout.Tab tab) {

            }

        });
    }






    @Override

    public boolean onOptionsItemSelected(MenuItem item) {

        int id = item.getItemId();

        if (id == R.id.action_settings) {

            return true;

        }
        return super.onOptionsItemSelected(item);

    }


//        super.onViewCreated(view, savedInstanceState);
    }

需要任何帮助，谢谢

2 个答案:

答案 0 :(得分：0)

您只需要调试和检查

public void setActionBarTitle(String title) {
    getSupportActionBar().setTitle(title);
}

方法是在寄存器自身片段的back事件上调用还是不调用。您没有提及在代码中调用setActionBarTitle（）方法的代码行。

答案 1 :(得分：0)

当我在onviewcreated方法中删除registerown_fragment中的前两行代码时，它会起作用谢谢您的帮助

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