片段到活動Backstack返回空白視圖

我已經創建了一個家庭活動，其中包括Tablayout and Navigation Drawer onclick與片段。我已將fragmentTransaction.addToBackStack(null).commit();與片段事務代碼包括在一起以返回到先前的活動。片段到活動Backstack返回空白視圖

我要的要求是從Activity with tablayout-->NavigationDrawer-->Fragment1--> On BackButtonPress-->MainActivity with tablayout.

不過，現在我已經能夠移動到片段1，而當回到MainActivity，視圖成爲filled with white(if i use mainLayout.removeAllViews();如果不會使用mainLayout.removeAllViews(); ,then the fragment is overlapping with the MainActivity）

1.My mainactivty

2.fragment

3.當我回到mainactivty

現在我不能在我的MainActivity中看到tablayout。

任何人都可以請幫助我。

mainactivity_layout.xml

<?xml version="1.0" encoding="utf-8"?> 
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" 
    xmlns:app="http://schemas.android.com/apk/res-auto" 
    xmlns:tools="http://schemas.android.com/tools" 
    android:layout_width="match_parent" 
    android:layout_height="match_parent" 
    android:paddingBottom="@dimen/activity_vertical_margin" 
    app:layout_behavior="@string/appbar_scrolling_view_behavior" 
    tools:context=".HomeActivity" 
    android:id="@+id/mainlayout" 
    tools:showIn="@layout/app_bar_home"> 

    <RelativeLayout 
     android:layout_width="match_parent" 
     android:layout_height="match_parent" 
     android:id="@+id/rel"> 
     <RelativeLayout 
      android:id="@+id/main_layout1" 
      xmlns:android="http://schemas.android.com/apk/res/android" 
      xmlns:tools="http://schemas.android.com/tools" 
      android:layout_width="match_parent" 
      android:layout_height="match_parent" 
      tools:context=".MainActivity"> 

      <android.support.design.widget.TabLayout 
       android:id="@+id/tab_layout1" 
       android:layout_width="match_parent" 
       android:layout_height="wrap_content" 
       android:background="?attr/colorPrimary" 
       android:elevation="6dp" 
       android:minHeight="?attr/actionBarSize" 
       android:theme="@style/ThemeOverlay.AppCompat.Dark.ActionBar"/> 

      <android.support.v4.view.ViewPager 
       android:id="@+id/pager1" 
       android:layout_width="match_parent" 
       android:layout_height="fill_parent" 
       android:layout_below="@id/tab_layout1"/> 

     </RelativeLayout> 
    </RelativeLayout> 



</RelativeLayout>

MainActivity.java

import android.content.Intent; 
    import android.net.Uri; 
    import android.os.Bundle; 
    import android.support.design.widget.NavigationView; 
    import android.support.design.widget.TabLayout; 
    import android.support.v4.app.FragmentManager; 
    import android.support.v4.app.FragmentTransaction; 
    import android.support.v4.view.GravityCompat; 
    import android.support.v4.view.ViewPager; 
    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.widget.RelativeLayout; 

    import java.io.File; 
    import java.util.ArrayList; 


    public class HomeActivity extends AppCompatActivity 
      implements NavigationView.OnNavigationItemSelectedListener { 


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

      DrawerLayout 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.setDrawerListener(toggle); 
      toggle.syncState(); 

      NavigationView navigationView = (NavigationView) findViewById(R.id.nav_view); 
      navigationView.setNavigationItemSelectedListener(this); 

      TabLayout tabLayout1 = (TabLayout) findViewById(R.id.tab_layout1); 
      tabLayout1.addTab(tabLayout1.newTab().setIcon(R.drawable.tab_ic_home)); 
      tabLayout1.addTab(tabLayout1.newTab().setIcon(R.drawable.tab_ic_map)); 
      tabLayout1.addTab(tabLayout1.newTab().setIcon(R.drawable.tab_ic_login)); 

      tabLayout1.setTabGravity(TabLayout.GRAVITY_FILL); 

      final ViewPager viewPager1 = (ViewPager) findViewById(R.id.pager1); 
      final PagerAdapter1 adapter = new PagerAdapter1 
        (getSupportFragmentManager(), tabLayout1.getTabCount()); 
      viewPager1.setAdapter(adapter); 
      viewPager1.addOnPageChangeListener(new TabLayout.TabLayoutOnPageChangeListener(tabLayout1)); 
      tabLayout1.setOnTabSelectedListener(new TabLayout.OnTabSelectedListener() { 
       @Override 
       public void onTabSelected(TabLayout.Tab tab) { 
        viewPager1.setCurrentItem(tab.getPosition()); 
       } 

       @Override 
       public void onTabUnselected(TabLayout.Tab tab) { 

       } 

       @Override 
       public void onTabReselected(TabLayout.Tab tab) { 

       } 
      }); 
     } 

     @Override 
     public void onBackPressed() { 
      DrawerLayout drawer = (DrawerLayout) findViewById(R.id.drawer_layout); 
      if (drawer.isDrawerOpen(GravityCompat.START)) { 
       drawer.closeDrawer(GravityCompat.START); 
      } else { 
       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.home, 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); 
     } 

     @SuppressWarnings("StatementWithEmptyBody") 
     @Override 
     public boolean onNavigationItemSelected(MenuItem item) { 
      FragmentManager fragmentManager = getSupportFragmentManager(); 
      FragmentTransaction fragmentTransaction = fragmentManager.beginTransaction(); 
      // Handle navigation view item clicks here. 
      int id = item.getItemId(); 
      RelativeLayout mainLayout=(RelativeLayout)findViewById(R.id.main_content); 
      if (id == R.id.nav_login) { 
       LoginFragment fragment = new LoginFragment(); 
    //   mainLayout.removeAllViews(); 
       fragmentTransaction.replace(R.id.mainlayout, fragment); 
       fragmentTransaction.addToBackStack(null).commit(); 
      } 

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

Fragment.java

import android.annotation.SuppressLint; 
import android.content.Intent; 
import android.net.Uri; 
import android.os.Bundle; 
import android.support.annotation.Nullable; 
import android.support.v4.app.Fragment; 
import android.support.v4.app.FragmentActivity; 
import android.view.LayoutInflater; 
import android.view.View; 
import android.view.ViewGroup; 
import android.widget.Button; 

import com.google.android.gms.maps.CameraUpdateFactory; 
import com.google.android.gms.maps.GoogleMap; 
import com.google.android.gms.maps.OnMapReadyCallback; 
import com.google.android.gms.maps.SupportMapFragment; 
import com.google.android.gms.maps.model.LatLng; 
import com.google.android.gms.maps.model.MarkerOptions; 

public class ContactFragment extends Fragment implements OnMapReadyCallback { 

    private GoogleMap mMap; 
    Button call; 

    public ContactFragment() { 
     // Required empty public constructor 
    } 
    @Nullable 
    @Override 
    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) { 
     View v = inflater.inflate(R.layout.activity_contact,container,false); 

     call = (Button) v.findViewById(R.id.button5); 
     call.setOnClickListener(new View.OnClickListener() { 
      @SuppressLint("NewApi") 
      @Override 
      public void onClick(View v) { 
       Intent i = new Intent(Intent.ACTION_DIAL); 
       i.setData(Uri.parse("tel:7034409615")); 
       startActivity(i); 
      } 
     }); 
     // Obtain the SupportMapFragment and get notified when the map is ready to be used. 
     SupportMapFragment mapFragment = (SupportMapFragment) getChildFragmentManager() 
       .findFragmentById(R.id.map); 
     mapFragment.getMapAsync(this); 
     return v; 


    } 

    @Override 
    public void onMapReady(GoogleMap googleMap) { 
     mMap = googleMap; 

     // Add a marker in Sydney and move the camera 
     LatLng sydney = new LatLng(9.2700, 76.7800); 
     mMap.addMarker(new MarkerOptions().position(sydney).title("Marker in Pathanamthitta")); 
     mMap.moveCamera(CameraUpdateFactory.newLatLng(sydney)); 
    } 
}

來源

2015-11-03 Rubin Nellikunnathu

什麼用'fragmentTransaction.commit（）時發生;'，而不是'fragmentTransaction.addToBackStack（空）.commit（）;''中?? onNavigationItemSelected' –

你必須在addToBackStack（「Login-or any」）中傳遞一些參數; ....當用戶後退時，你已經overBided onBackPressed（）與導航抽屜。 –

應用程序會關閉當前的分段屏幕。不會回到mainactivty。 –

正如我在評論中建議，爲了找出問題的片段顯示，你可以嘗試查看如下
Log.d（「FragmentList」被添加什麼樣的碎片進入回堆，getSupportFragmentManager （）.getFragments（）的toString（）; 你可以把它裏面onBackPressed()，onNavigationItemSelected()

根據您的反饋意見是對你有幫助，你想通了這個問題

也有一些佈局設計問題：您目前的做法是添加frag進入相對佈局。我認爲這會導致一些觀點上的問題。推薦的方法是在docs 描述您可能還需要移動用於片段一切外界看來我已經重寫你的佈局下面的文檔建議的準則，以片段加入到FrameLayout裏。 P.S我沒有測試過它是如何顯示的..你可能需要調整一些佈局參數。

<?xml version="1.0" encoding="utf-8"?> 
    <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" 
        xmlns:app="http://schemas.android.com/apk/res-auto" 
        xmlns:tools="http://schemas.android.com/tools" 
        android:orientation="vertical" 
        android:layout_width="match_parent" 
        android:layout_height="match_parent"> 
     <!-- 
     Layout for fragments 
     --> 
     <FrameLayout 
        android:id="@+id/mainlayout" 
         android:layout_width="match_parent" 
         android:layout_height="match_parent" 
         android:paddingBottom="@dimen/activity_vertical_margin" 
         app:layout_behavior="@string/appbar_scrolling_view_behavior" 
         tools:showIn="@layout/app_bar_home"> 

     </RelativeLayout> 
     <RelativeLayout 
       android:layout_width="match_parent" 
       android:layout_height="match_parent" 
       android:id="@+id/rel"> 
      <RelativeLayout 
        android:id="@+id/main_layout1" 
        android:layout_width="match_parent" 
        android:layout_height="match_parent"> 

       <android.support.design.widget.TabLayout 
         android:id="@+id/tab_layout1" 
         android:layout_width="match_parent" 
         android:layout_height="wrap_content" 
         android:background="?attr/colorPrimary" 
         android:elevation="6dp" 
         android:minHeight="?attr/actionBarSize" 
         android:theme="@style/ThemeOverlay.AppCompat.Dark.ActionBar" android:orientation="horizontal"/> 

       <android.support.v4.view.ViewPager 
         android:id="@+id/pager1" 
         android:layout_width="match_parent" 
         android:layout_height="fill_parent" 
         android:layout_below="@id/tab_layout1"/> 

      </RelativeLayout> 
     </RelativeLayout> 
    </LinearLayout>

而且你在你的佈局像tools:context=".MainActivity"和tools:context=".HomeActivity"我想這只是未經編輯複製粘貼定義了多個活動，但可能會導致一些問題，以及。

希望你覺得它有用:)

來源

2015-11-16 06:36:04 ProblemSlover

在你MainActivity.java補充一點：

protected OnBackPressedListener onBackPressedListener; 

public interface OnBackPressedListener { 
    void doBack(); 
} 

public void setOnBackPressedListener(OnBackPressedListener onBackPressedListener) { 
    this.onBackPressedListener = onBackPressedListener; 
} 

@Override 
public void onBackPressed() { 
    if (onBackPressedListener != null) 
     onBackPressedListener.doBack(); 
    else 
     super.onBackPressed(); 
}

比Fragment.java實現類是這樣的：

implements MainActivity.OnBackPressedListener

並實現方法：

@Override 
public void doBack() { 
    Intent yourMainActivity = new Intent(getActivity(), MainActivity.class); 
    startActivity(yourMainActivity); 
}

來源

2015-11-15 22:03:11

魯賓Nellikunnathu。我遇到過同樣的問題。替換FrameLayout中的NavigationView片段，而不是RelativeLayout。所以你總是會加載TabLayout和ViewPager。將它放在mainactivity_layout.xml或app_bar_home.xml（我沒有看到你的完整代碼，所以你試試這些組合）。

mainactivity_layout.xml

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" 
    xmlns:app="http://schemas.android.com/apk/res-auto" 
    xmlns:tools="http://schemas.android.com/tools" 
    android:layout_width="match_parent" 
    android:layout_height="match_parent" 
    android:paddingBottom="@dimen/activity_vertical_margin" 
    app:layout_behavior="@string/appbar_scrolling_view_behavior" 
    tools:context=".HomeActivity" 
    android:id="@+id/mainlayout" 
    tools:showIn="@layout/app_bar_home"> 

<RelativeLayout 
    android:layout_width="match_parent" 
    android:layout_height="match_parent" 
    android:id="@+id/rel"> 
    <RelativeLayout 
     android:id="@+id/main_layout1" 
     xmlns:android="http://schemas.android.com/apk/res/android" 
     xmlns:tools="http://schemas.android.com/tools" 
     android:layout_width="match_parent" 
     android:layout_height="match_parent" 
     tools:context=".MainActivity"> 

     <android.support.design.widget.TabLayout 
      android:id="@+id/tab_layout1" 
      android:layout_width="match_parent" 
      android:layout_height="wrap_content" 
      android:background="?attr/colorPrimary" 
      android:elevation="6dp" 
      android:minHeight="?attr/actionBarSize" 
      android:theme="@style/ThemeOverlay.AppCompat.Dark.ActionBar"/> 

     <android.support.v4.view.ViewPager 
      android:id="@+id/pager1" 
      android:layout_width="match_parent" 
      android:layout_height="fill_parent" 
      android:layout_below="@id/tab_layout1"/> 

     </RelativeLayout> 
    </RelativeLayout> 

    // Replace NavigationView fragments in this FrameLayout 
    <FrameLayout 
     android:id="@+id/flForReplace" 
     android:layout_width="match_parent" 
     android:layout_height="match_parent" 
     tools:context=".FrameLayout" /> 

</RelativeLayout>

，你的代碼應該是

fragmentTransaction.replace(R.id.flForReplace, fragment);

也fragmentTransaction.commit();取代fragmentTransaction.addToBackStack(null).commit();作爲ρяσѕρєяķ建議。

來源

2015-11-15 22:55:13

片段到活動Backstack返回空白視圖

回答

相關問題