在家庭活動中打開一個片段

Question

我一直在通過堆棧溢出進行搜索，但似乎找不到有關此問題的一些有用的信息。 下面我附加了Home Activity的代碼，有，和它的XML文件。我似乎無法解決問題所在，我不知道自己做錯了什麼。我想顯示第三個類的內容（例如，我的每個片段都有一個不同的Fragment類，基本上我希望能夠在家庭活動中顯示同一個片段持有者中的所有片段。在這種情況下我試圖打開片段書籤（men.bookmarks）..

任何建議傢伙？

我並沒有包括在片段中的代碼，這將是一個很大的類的話，但如果你需要的話，告訴我:) ..

XML file for my HomeActivity: 
<?xml version="1.0" encoding="utf-8"?> <android.support.v4.widget.DrawerLayout 
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:id="@+id/drawer_layout" 
android:layout_width="match_parent" 
android:layout_height="match_parent" 
android:fitsSystemWindows="true" 
tools:openDrawer="start" > 


<include 
    layout="@layout/app_bar_home" 
    android:layout_width="match_parent" 
    android:layout_height="match_parent"/> 

<android.support.design.widget.NavigationView 
    android:id="@+id/nav_view" 
    android:layout_width="wrap_content" 
    android:layout_height="match_parent" 
    android:layout_gravity="start" 
    android:fitsSystemWindows="true" 
    app:headerLayout="@layout/nav_header_home" 
    app:menu="@menu/activity_home_drawer" /> 

<fragment 
    android:name="com.nooriandroid.n007.mybookmarks_v1.Fragment_Bookmarks" 
    android:id="@+id/fragBookmarks" 
    android:layout_weight="2" 
    android:layout_width="25dp" 
    android:layout_height="match_parent" /> 

</android.support.v4.widget.DrawerLayout> 

---

package com.nooriandroid.n007.mybookmarks_v1; 
    import android.app.Fragment; 
    import android.app.FragmentManager; 
    import android.app.FragmentTransaction; 
    import android.content.Intent; 
import android.net.Uri; 
import android.os.Bundle; 
import android.support.design.widget.FloatingActionButton; 
import android.support.design.widget.NavigationView; 
import android.support.design.widget.Snackbar; 
import android.support.v4.view.GravityCompat; 
import android.support.v4.widget.DrawerLayout; 
import android.support.v7.app.ActionBar; 
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.ImageView; 
import android.widget.TextView; 
import android.widget.Toast; 
import java.io.File; 
import java.text.SimpleDateFormat; 
import java.util.Date; 

public class Activity_Home extends AppCompatActivity implements NavigationView.OnNavigationItemSelectedListener { 

    //--------------Variables---------------------// 
    private String date_pattern = "hh:mm dd-MM-yyyy"; 
    private Fragment fragment_bookmarks; 
    private Fragment_Favorite fragment_favorite; 
    private Fragment_Category fragment_category; 
    private Fragment_SharedWith_me fragment_sharedWith_me; 
    private Fragment_Myshared fragment_myshared; 
    private Activity_Home homeActivity; 
    private Fragment_Item_Container fragment_item_container; 

    private User user; 
    private boolean frag_favorite_visible = false, frag_bookmark_visible = false, frag_category_visible = false, 
      frag_myshared_visible = false, frag_sharedwithme__visible = false; 

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

     //---------------Customized------------------// 
     setTitle("Home"); 
     ActionBar ab = getSupportActionBar(); 
     ab.setLogo(R.mipmap.ic_logolight); 
     ab.setDisplayUseLogoEnabled(true); 
     ab.setDisplayShowHomeEnabled(true); 

     fragment_favorite = new Fragment_Favorite(); 
     fragment_bookmarks = new Fragment_Bookmarks(); 
     fragment_category = new Fragment_Category(); 
     fragment_myshared = new Fragment_Myshared(); 
     fragment_sharedWith_me = new Fragment_SharedWith_me(); 
     fragment_item_container = new Fragment_Item_Container(); 
     homeActivity = this; 

     FragmentManager fragmentManager = getFragmentManager(); 
     final FragmentTransaction fragmentTransaction = fragmentManager.beginTransaction(); 
     fragmentTransaction.add(R.id.fragment_container, fragment_favorite); 
     fragmentTransaction.add(R.id.fragment_container, fragment_bookmarks); 
     fragmentTransaction.add(R.id.fragment_container, fragment_category); 
     fragmentTransaction.add(R.id.fragment_container, fragment_myshared); 
     fragmentTransaction.add(R.id.fragment_container, fragment_sharedWith_me); 
     frag_favorite_visible = true; 
     fragmentTransaction.hide(fragment_bookmarks); 
     fragmentTransaction.hide(fragment_category); 
     fragmentTransaction.hide(fragment_myshared); 
     fragmentTransaction.hide(fragment_sharedWith_me); 
     fragmentTransaction.commit(); 

     goHomeOnclicked(); 

     user = new User(); 
     user = (User) getIntent().getSerializableExtra("currentuser"); 
    } 

    @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); 
     rundUserSettings(); 
     SimpleDateFormat format = new SimpleDateFormat(date_pattern); 
     String current_date = format.format(new Date()); 

     TextView nav_textview_Date = (TextView) findViewById(R.id.textView_Date); 
     nav_textview_Date.setText(current_date); 
     TextView nameLast_textView = (TextView) findViewById(R.id.textView_UsernameLastname); 
     nameLast_textView.setText("" + user.getName() + " " + user.getLast_name()); 

     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) { 
     // Handle navigation view item clicks here. 
     int id = item.getItemId(); 
     if (id == R.id.men_newItem) { 
      Intent intent_NewItem = new Intent("com.nooriandroid.n007.mybookmarks_v1.Activity_NewItem"); 
      startActivity(intent_NewItem); 

     } else if (id == R.id.men_bookmarks) { 
      FragmentManager fragmentManager = getFragmentManager(); 
      FragmentTransaction fragmentTransaction = fragmentManager.beginTransaction(); 
      checkFragmentsStatus(fragmentTransaction); 
      fragmentTransaction.show(fragment_bookmarks); 
      frag_bookmark_visible = true; 
      this.setTitle("Bookmarks"); ///Ombytnings Zirt 
      fragmentTransaction.commit(); /// 


     } else if (id == R.id.men_category) { 
      FragmentManager fragmentManager = getFragmentManager(); 
      FragmentTransaction fragmentTransaction = fragmentManager.beginTransaction(); 
      checkFragmentsStatus(fragmentTransaction); 
      frag_category_visible= true; 
      fragmentTransaction.show(fragment_category); 
      fragmentTransaction.commit(); 
      this.setTitle("Categories "); 

      Toast.makeText(Activity_Home.this,"Not implemented yet.!",Toast.LENGTH_SHORT).show(); 
     } 
     else if (id == R.id.men_share) { 
      Toast.makeText(Activity_Home.this,"Not implemented yet.!",Toast.LENGTH_SHORT).show(); 

     } else if (id == R.id.men_sharedwithme) { 
      FragmentManager fragmentManager = getFragmentManager(); 
      FragmentTransaction fragmentTransaction = fragmentManager.beginTransaction(); 
      checkFragmentsStatus(fragmentTransaction); 
      frag_sharedwithme__visible = true; 
      fragmentTransaction.show(fragment_sharedWith_me); 
      fragmentTransaction.commit(); 
      this.setTitle("Shared with me"); 
      Toast.makeText(Activity_Home.this,"Not implemented yet.!",Toast.LENGTH_SHORT).show(); 
     } else if (id == R.id.men_myshared) { 
      FragmentManager fragmentManager = getFragmentManager(); 
      FragmentTransaction fragmentTransaction = fragmentManager.beginTransaction(); 
      checkFragmentsStatus(fragmentTransaction); 
      frag_myshared_visible = true; 
      fragmentTransaction.show(fragment_myshared); 
      fragmentTransaction.commit(); 
      this.setTitle("My shared"); 
      Toast.makeText(Activity_Home.this,"Not implemented yet.!",Toast.LENGTH_SHORT).show(); 
     } 
     DrawerLayout drawer = (DrawerLayout) findViewById(R.id.drawer_layout); 
     drawer.closeDrawer(GravityCompat.START); 
     return true; 
    } 

    private void checkFragmentsStatus(FragmentTransaction fragmentTransaction){ 
     if (frag_favorite_visible){ 
      frag_favorite_visible = false; 
      fragmentTransaction.hide(fragment_favorite); 
     }else if (frag_bookmark_visible){ 
      frag_bookmark_visible = false; 
      fragmentTransaction.hide(fragment_bookmarks); 
     }else if (frag_category_visible){ 
      frag_category_visible = false; 
      fragmentTransaction.hide(fragment_category); 
     }else if (frag_myshared_visible){ 
      frag_myshared_visible = false; 
      fragmentTransaction.hide(fragment_myshared); 
     }else if (frag_sharedwithme__visible){ 
      frag_sharedwithme__visible = false; 
      fragmentTransaction.hide(fragment_sharedWith_me); 
     } 
    } 

    private void goHomeOnclicked(){ 
     findViewById(R.id.toolbar).setOnClickListener(new View.OnClickListener() { 
      @Override 
      public void onClick(View v) { 
       if (!frag_favorite_visible){ 
        FragmentManager fragmentManager = getFragmentManager(); 
        FragmentTransaction fragmentTransaction = fragmentManager.beginTransaction(); 
        checkFragmentsStatus(fragmentTransaction); 
        frag_favorite_visible = true; 
        fragmentTransaction.show(fragment_favorite); 
        fragmentTransaction.commit(); 
        homeActivity.setTitle("Home"); 
       } 
      } 
     }); 
    } 

    private boolean rundUserSettings(){ 
     if (this.user!=null){ 
      try { 
       File file = new File(user.getProfile_pic()); 
       Uri uri = Uri.fromFile(file); 
       ImageView view = (ImageView) findViewById(R.id.imageView_ProfilePic); 
       view.setImageURI(uri); 

      }catch (Exception e){ 
       Toast.makeText(Activity_Home.this,"Unable to load profile picture.!",Toast.LENGTH_SHORT).show(); 
      } 
      return true; 
     } else { 
      return false; 
     } 
    } 
    } 

Answer 1

你用於在同一活動中添加不同片段的代碼真的搞砸了。你可以使用更好的方法。我添加下面的示例代碼：

在活動的佈局，加入這行代碼

<FrameLayout 
     android:id="@+id/fragBookmarks" 
     android:layout_weight="2" 
     android:layout_width="25dp" 
     android:layout_height="match_parent" /> 

代替：

<fragment 
android:name="com.nooriandroid.n007.mybookmarks_v1.Fragment_Bookmarks" 
android:id="@+id/fragBookmarks" 
android:layout_weight="2" 
android:layout_width="25dp" 
android:layout_height="match_parent" /> 

現在寫在你的HomeActivity此方法來添加不同的片段

public void addFragment(Fragment frag, String tag) { 
    FragmentTransaction transaction = getFragmentManager().beginTransaction(); 
    transaction.replace(R.id.fragBookmarks, frag, tag); 
    transaction.addToBackStack(getFragmentManager().getBackStackEntryCount() == 0 ? "FirstFragment" : null).commit(); 
    } 
} 

此方法將幫助您將任何片段添加到此活動的 走。您不需要從頭開始添加所有片段。喜歡如果現在我在HomeFragment上，並且我想在Home中打開按鈕上的BookmarkFragment，我會寫出類似於;

btnBookmark.setOnClickListener(new View.OnClickListener() { 
     @Override 
     public void onClick(View v) { 
      ((HomeActivity) getActivity()).addFragment(new BookmarkFragment(), BookmarkFragment.class.getSimpleName()); // This will add the new fragment Bookmark fragment to the activity while adding it to backstack 
     } 
    }); 

現在，如果你想要去的BookmarkFragment到HomeFragment回來，在你HomeActivity

public void popFragment() { 
    if (getFragmentManager() == null) 
     return; 
    getFragmentManager().popBackStack(); 
} 

添加該方法並調用BookmarkFragment這樣的功能，

btnBack.setOnClickListener(new View.OnClickListener() { 
     @Override 
     public void onClick(View v) { 
      ((HomeActivity) getActivity()).popFragment(); // This will remove the last added fragment Bookmark fragment 
     } 
    }); 

Answer 2

DrawerLayout應該只有兩個直接children.If要在同一個活動，更換不同的片段，在你的活動創建的app_bar_home layout.Then一個FrameLayout裏，這樣做是爲了替換片段。

FragmentManager fragmentManager = getSupportFragmentManager(); 
FragmentTransaction transaction = fragmentManager.beginTransaction(); 
transaction.replace(R.id.frame_layout_id,new yourFragment()).commit();