如何在單個佈局中動態添加2個片段？

Question

我想在一個單一的佈局像這樣加2個片段：

我可以使用靜態片段的方法，但不是能夠動態地做到這一點做到這一點。我想要定位API 14及更高版本。

下面是代碼：

1. activity_main.xml中：

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" 
 
    android:layout_width="fill_parent" 
 
    android:layout_height="fill_parent" 
 
    android:orientation="vertical"> 
 

 

 
    <FrameLayout 
 
     android:id="@+id/new_placeholder" 
 
     android:layout_width="match_parent" 
 
     android:layout_height="match_parent"> 
 

 
    </FrameLayout> 
 

 
    <FrameLayout 
 
     android:id="@+id/my_placeholder" 
 
     android:layout_width="match_parent" 
 
     android:layout_height="match_parent" 
 
     > 
 

 
    </FrameLayout> 
 

 
</LinearLayout>

fragment1.xml：

<?xml version="1.0" encoding="utf-8"?> 
 
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" 
 
    android:layout_width="match_parent" 
 
    android:layout_height="match_parent" 
 
    android:orientation="vertical" 
 
    android:background="#00ff00" 
 
    > 
 

 
    <TextView 
 
     android:id="@+id/textView1" 
 
     android:layout_width="wrap_content" 
 
     android:layout_height="wrap_content" 
 
     android:text="fragment first" 
 
     android:textAppearance="?android:attr/textAppearanceLarge" 
 
     android:layout_weight="1" 
 
     /> 
 

 
</LinearLayout>

fragment2.xml：

<?xml version="1.0" encoding="utf-8"?> 
 
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" 
 
    android:layout_width="match_parent" 
 
    android:layout_height="match_parent" 
 
    android:orientation="vertical" 
 
    android:background="#0000ff"> 
 

 
    <TextView 
 
     android:id="@+id/textView2" 
 
     android:layout_width="wrap_content" 
 
     android:layout_height="wrap_content" 
 
     android:text="fragment second" 
 
     android:textAppearance="?android:attr/textAppearanceLarge" 
 
     android:layout_weight="1" 
 
     /> 
 

 
</LinearLayout>

片段1。 java：

package org.hinduismfacts.www.dynamicfragment; 
 

 
import android.app.Fragment; 
 
import android.os.Bundle; 
 
import android.view.LayoutInflater; 
 
import android.view.View; 
 
import android.view.ViewGroup; 
 

 
/** 
 
* Created by Rahul on 07-08-2017. 
 
*/ 
 

 
public class fragment1 extends Fragment { 
 
    @Override 
 
    public View onCreateView(LayoutInflater inflater, ViewGroup container, 
 
          Bundle savedInstanceState) { 
 
     // TODO Auto-generated method stub 
 
     return inflater.inflate(R.layout.fragment1,container, false); 
 
    } 
 

 
}

fragment2.java：

package org.hinduismfacts.www.dynamicfragment; 
 

 
import android.app.Fragment; 
 
import android.os.Bundle; 
 
import android.view.LayoutInflater; 
 
import android.view.View; 
 
import android.view.ViewGroup; 
 

 
/** 
 
* Created by Rahul on 07-08-2017. 
 
*/ 
 

 
public class fragment2 extends Fragment { 
 
    @Override 
 
    public View onCreateView(LayoutInflater inflater, ViewGroup container, 
 
          Bundle savedInstanceState) { 
 
     // TODO Auto-generated method stub 
 
     return inflater.inflate(R.layout.fragment2,container, false); 
 
    } 
 

 
}

MainActivity .java：

package org.hinduismfacts.www.dynamicfragment; 
 

 
import android.app.Fragment; 
 
import android.app.FragmentManager; 
 
import android.app.FragmentTransaction; 
 
import android.support.v7.app.AppCompatActivity; 
 
import android.os.Bundle; 
 
import android.view.View; 
 
import android.widget.TextView; 
 

 
public class MainActivity extends AppCompatActivity { 
 

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

 
     FragmentManager fragmentManager = getFragmentManager(); 
 
     FragmentTransaction fragmentTransaction = fragmentManager.beginTransaction(); 
 
// Create new fragment and transaction 
 
     Fragment newFragment = new fragment1(); 
 
     Fragment myFragment = new fragment2(); 
 

 
     FragmentTransaction transaction = getFragmentManager().beginTransaction(); 
 

 
// Replace whatever is in the fragment_container view with this fragment, 
 
// and add the transaction to the back stack 
 
     transaction.add(R.id.new_placeholder, newFragment); 
 
     transaction.add(R.id.my_placeholder, myFragment); 
 

 
     transaction.commit(); 
 

 
    } 
 
}

在輸出我得到只顯示第一個片段。第二個片段沒有被添加。輸出：

能否請你告訴我什麼錯誤？

Answer 1

請加入android:layout_weight="1"

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" 
    android:layout_width="fill_parent" 
    android:layout_height="fill_parent" 
    android:orientation="horizontal"> 


    <LinearLayout 
     android:id="@+id/new_placeholder" 
     android:layout_width="match_parent" 
     android:layout_weight="1" 
     android:layout_height="match_parent"> 

    </LinearLayout> 

    <LinearLayout 
     android:id="@+id/my_placeholder" 
     android:layout_width="match_parent" 
     android:layout_weight="1" 
     android:layout_height="match_parent" 
     > 

    </LinearLayout> 

</LinearLayout> 

Answer 2

問題出在您的activity_main.xml中。 使用android:layout_weight="1"爲每個碎片容器在屏幕上顯示它們。

另外fill_parent已棄用。考慮使用match_parent代替

Answer 3

您需要佈局重android:layout_weight爲您的框架佈局 試試下面XML改變

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" 
    android:layout_width="match_parent" 
    android:layout_height="match_parent" 
    android:weightSum="2" 
    android:orientation="horizontal"> 

    <FrameLayout 
     android:id="@+id/new_placeholder" 
     android:layout_width="0dp" 
     android:layout_weight="1" 
     android:layout_height="match_parent"> 
    </FrameLayout> 

    <FrameLayout 
     android:id="@+id/my_placeholder" 
     android:layout_width="0dp" 
     android:layout_weight="1" 
     android:layout_height="match_parent"> 
    </FrameLayout> 

</LinearLayout>