SeekBar在更改片段时消失？

我在这里有1个XML文件中有3个片段和2个framelayout，前2个片段是文本，它正常显示，但是当我替换了seekbar的第三个片段时，它就消失了！但是，如果我先显示第三个片段，那么seekbar显示正常，TextView消失了！这是我的代码：SeekBar在更改片段时消失？

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(); 
}

片段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; 
}

片段2和3是相同的片段1。

这是main.xml中：

<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

来源

2016-05-06 Hải Tô Hoàng

replaceFragment（fragment3，R.id.fragment2，“FRG3”）;更改为replaceFragment（fragment3，R.id.fragment1，“FRG3”）;并评论该fram布局 – Pavya

您可以测试这种情况：将FrameLayout（的片段1和2）的高度设置为静态大小（例如：200dp），移除layout_weight并查看发生了什么。 –

1）只为权重和更新的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"> 

    <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）片段1相同为片段2和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相同为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>

来源

2016-05-06 06:50:47

谢谢，它的工作！非常感谢。 –

欢迎。请让堆栈溢出知道它的正确答案 –

SeekBar在更改片段时消失？

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