SeekBar verschwinden, wenn Fragment ändern?

Question

Ich habe 3 Fragment und 2 framelayout in 1 XML-Datei hier, das erste 2 Fragment ist ein Text und es wird normalerweise angezeigt, aber wenn ich das dritte Fragment, die seekbar haben, ersetzt haben dann verschwand es! Aber wenn ich das dritte Fragment zuerst zeige, dann ging die Suchleiste normal und die TextView ging weg! Dies ist mein Code:

MainActivity

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

    btn1 = (Button)findViewById(R.id.btn1); 
    btn2=(Button)findViewById(R.id.btn2); 
    btn3=(Button)findViewById(R.id.btn3); 

    fragment1= new Fragment1(); 
    fragment2 = new Fragment2(); 
    fragment3 = new Fragment3(); 




    btn1.setOnClickListener(new View.OnClickListener() { 
     @Override 
     public void onClick(View v) { 
      replaceFragment(fragment1,R.id.fragment1,"FRG1"); 
     } 
    }); 
    btn2.setOnClickListener(new View.OnClickListener() { 
     @Override 
     public void onClick(View v) { 
      replaceFragment(fragment2,R.id.fragment2,"FRG2"); 

     } 
    }); 
    btn3.setOnClickListener(new View.OnClickListener() { 
     @Override 
     public void onClick(View v) { 
      replaceFragment(fragment3,R.id.fragment2,"FRG3"); 

     } 
    }); 

} 
public void replaceFragment(Fragment fragment , int containerResId, String tag){ 
    android.support.v4.app.FragmentTransaction trans = getSupportFragmentManager() 
      .beginTransaction(); 
    trans.replace(containerResId , fragment , tag); 
    trans.commit(); 
    getSupportFragmentManager().executePendingTransactions(); 
} 

Fragment 1:

@Override 
public void onCreate(Bundle savedInstanceState) { 
    super.onCreate(savedInstanceState); 
} 

@Nullable 
@Override 
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) { 
    View view=inflater.inflate(R.layout.fragment1,container,false); 
    return view; 
} 

Fragment 2 und 3 ist die gleiche wie fragment1.

Dies ist main.xml:

<LinearLayout 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" 
    android:orientation="vertical" 
    tools:context="com.example.macbook.fragment.MainActivity"> 
    <LinearLayout 
     android:layout_width="match_parent" 
     android:layout_height="wrap_content"> 
     <Button 
      android:id="@+id/btn1" 
      android:layout_width="wrap_content" 
      android:layout_height="wrap_content" 
      android:text="fragment1"/> 
     <Button 
      android:id="@+id/btn2" 
      android:layout_width="wrap_content" 
      android:layout_height="wrap_content" 
      android:text="fragment2"/> 
     <Button 
      android:id="@+id/btn3" 
      android:layout_width="wrap_content" 
      android:layout_height="wrap_content" 
      android:text="fragment3"/> 
    </LinearLayout> 
<FrameLayout 
    android:id="@+id/fragment1" 
    android:layout_weight="5" 
    android:layout_width="match_parent" 
    android:layout_height="wrap_content"> 
</FrameLayout> 
    <FrameLayout 
     android:id="@+id/fragment2" 
     android:layout_weight="5" 
     android:layout_width="match_parent" 
     android:layout_height="wrap_content"></FrameLayout> 

</LinearLayout> 

Fragment3.xml:

<?xml version="1.0" encoding="utf-8"?> 
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" 
    android:layout_width="match_parent" 
    android:layout_height="match_parent"> 

    <SeekBar 
     android:layout_width="match_parent" 
     android:layout_height="wrap_content" 
     android:layout_centerVertical="true" 
     android:visibility="visible" /> 
</RelativeLayout> 

and this happen when i display fragment 3 which have seekbar

if i display fragment 3 first then any TextView can't display

Answer 1

1) Aktualisieren Sie einfach main.xml für Gewichtssumme

<LinearLayout 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" 
    android:orientation="vertical"> 

    <LinearLayout 
     android:layout_width="match_parent" 
     android:layout_height="wrap_content"> 
     <Button 
      android:id="@+id/btn1" 
      android:layout_width="wrap_content" 
      android:layout_height="wrap_content" 
      android:text="fragment1"/> 
     <Button 
      android:id="@+id/btn2" 
      android:layout_width="wrap_content" 
      android:layout_height="wrap_content" 
      android:text="fragment2"/> 
     <Button 
      android:id="@+id/btn3" 
      android:layout_width="wrap_content" 
      android:layout_height="wrap_content" 
      android:text="fragment3"/> 
    </LinearLayout> 

    <LinearLayout 
     android:layout_width="match_parent" 
     android:layout_height="match_parent" 
     android:weightSum="10" 
     android:orientation="vertical"> 

    <FrameLayout 
     android:id="@+id/fragment1" 
     android:layout_weight="5" 
     android:layout_width="match_parent" 
     android:layout_height="0dp"> 
    </FrameLayout> 


    <FrameLayout 
     android:id="@+id/fragment2" 
     android:layout_weight="5" 
     android:layout_width="match_parent" 
     android:layout_height="0dp"> 
    </FrameLayout> 
    </LinearLayout> 
</LinearLayout> 

2) MainActivity.class

import android.os.Bundle; 
import android.support.v4.app.Fragment; 
import android.support.v7.app.AppCompatActivity; 
import android.view.View; 
import android.widget.Button; 


public class MainActivity extends AppCompatActivity { 

    Fragment1 fragment1; 
    Fragment2 fragment2; 
    Fragment3 fragment3; 
    Button btn1, btn2, btn3; 

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

     btn1 = (Button) findViewById(R.id.btn1); 
     btn2 = (Button) findViewById(R.id.btn2); 
     btn3 = (Button) findViewById(R.id.btn3); 

     fragment1 = new Fragment1(); 
     fragment2 = new Fragment2(); 
     fragment3 = new Fragment3(); 


     btn1.setOnClickListener(new View.OnClickListener() { 
      @Override 
      public void onClick(View v) { 
       replaceFragment(fragment1, R.id.fragment1, "FRG1"); 
      } 
     }); 
     btn2.setOnClickListener(new View.OnClickListener() { 
      @Override 
      public void onClick(View v) { 
       replaceFragment(fragment2, R.id.fragment2, "FRG2"); 

      } 
     }); 
     btn3.setOnClickListener(new View.OnClickListener() { 
      @Override 
      public void onClick(View v) { 
       replaceFragment(fragment3, R.id.fragment2, "FRG3"); 

      } 
     }); 

    } 

    public void replaceFragment(Fragment fragment, int containerResId, String tag) { 
     android.support.v4.app.FragmentTransaction trans = getSupportFragmentManager() 
       .beginTransaction(); 
     trans.replace(containerResId, fragment, tag); 
     trans.commit(); 
     getSupportFragmentManager().executePendingTransactions(); 
    } 
} 

3) Fragment1 gleiche für Fragment 2 und 3

import android.os.Bundle; 
import android.support.annotation.Nullable; 
import android.support.v4.app.Fragment; 
import android.view.LayoutInflater; 
import android.view.View; 
import android.view.ViewGroup; 


public class Fragment1 extends Fragment { 

    @Override 
    public void onCreate(Bundle savedInstanceState) { 
     super.onCreate(savedInstanceState); 
    } 

    @Nullable 
    @Override 
    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) { 
     View view=inflater.inflate(R.layout.fragment1,container,false); 
     return view; 
    } 

4) Fragment1.xml gleiche für fragment2.xml

<?xml version="1.0" encoding="utf-8"?> 
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" 
    android:orientation="vertical" android:layout_width="match_parent" 
    android:layout_height="match_parent"> 

    <TextView 
     android:layout_width="match_parent" 
     android:layout_height="wrap_content" 
     android:text="Hi" 
     android:textSize="20dp" 
     android:layout_margin="20dp"/> 

</LinearLayout> 

5) fragment3.xml

<?xml version="1.0" encoding="utf-8"?> 
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" 
    android:layout_width="match_parent" 
    android:layout_height="match_parent"> 

    <SeekBar 
     android:layout_width="match_parent" 
     android:layout_height="wrap_content" 
     android:layout_centerVertical="true" 
     android:visibility="visible" /> 
</RelativeLayout>