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POgetChildFragmentManager() on programmatically (dynamically) added Fragments?
 

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    <p>How to use (or "Can we use") <code>getChildFragmentManager()</code> on programmatically (dynamically) added <code>Fragment</code>s?</p> <p><strong>Here is my example.</strong></p> <p>I have one <code>MainActivity</code>, one <code>OuterFrag</code>, and one <code>InnerFrag</code>. I will add the <code>OuterFrag</code> to <code>MainActivity</code> dynamically by the <code>FragmentManager</code>. And also, I will add the <code>InnerFrag</code> to the <code>OuterFrag</code> also dynamically by the <code>FragmentManager</code>. But I want to add <code>InnerFrag</code> exactly as a child of the <code>OuterFrag</code>, not replacing <code>OuterFrag</code> and be the new child of the <code>MainActivity</code>.</p> <p><strong>I want to keep this hierarchy: <code>MainActivity -&gt; OuterFrag -&gt; InnerFrag</code>. So MainActivity can always call OuterFrag.</strong></p> <p>But NOT change from this hierarchy: <code>MainActivity -&gt; OuterFrag</code> to this hierarchy: <code>MainActivity -&gt; InnerFrag</code> that <code>MainActivity</code> will loss the <code>OuterFrag</code>.</p> <p><strong>Here is my example code.</strong></p> <p><strong>MainActivity.java</strong></p> <pre><code>package com.example.frag; import android.os.Bundle; import android.support.v4.app.FragmentActivity; public class MainActivity extends FragmentActivity { @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); getSupportFragmentManager().beginTransaction().add(R.id.frameLayout, new OuterFrag()).commit(); getSupportFragmentManager().executePendingTransactions(); System.out.println("Before: " + getSupportFragmentManager().findFragmentById(R.id.frameLayout)); ((OuterFrag) getSupportFragmentManager().findFragmentById(R.id.frameLayout)) .addInnerFrag(); System.out.println("After: " + getSupportFragmentManager().findFragmentById(R.id.frameLayout)); } } </code></pre> <p><strong>activity_main.xml</strong></p> <pre><code>&lt;FrameLayout xmlns:android="http://schemas.android.com/apk/res/android" android:id="@+id/frameLayout" android:layout_width="fill_parent" android:layout_height="fill_parent" &gt; &lt;/FrameLayout&gt; </code></pre> <p><strong>OuterFrag.java</strong></p> <pre><code>package com.example.frag; import android.os.Bundle; import android.support.v4.app.Fragment; import android.view.LayoutInflater; import android.view.View; import android.view.ViewGroup; public class OuterFrag extends Fragment { public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) { return inflater.inflate(R.layout.outer_frag, container, false); } public void addInnerFrag() { getFragmentManager().beginTransaction().replace(this.getId(), new InnerFrag()).commit(); getFragmentManager().executePendingTransactions(); // getChildFragmentManager().beginTransaction().add(this.getId(), new InnerFrag()).commit(); // getChildFragmentManager().executePendingTransactions(); } } </code></pre> <p><strong>outer_frag.xml</strong></p> <pre><code>&lt;TextView xmlns:android="http://schemas.android.com/apk/res/android" android:id="@+id/textView1" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="i am the OUTER frag" /&gt; </code></pre> <p><strong>InnerFrag.java</strong></p> <pre><code>package com.example.frag; import android.os.Bundle; import android.support.v4.app.Fragment; import android.view.LayoutInflater; import android.view.View; import android.view.ViewGroup; public class InnerFrag extends Fragment { public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) { return inflater.inflate(R.layout.inner_frag, container, false); } } </code></pre> <p><strong>inner_frag.xml</strong></p> <pre><code>&lt;TextView xmlns:android="http://schemas.android.com/apk/res/android" android:id="@+id/textView2" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="i am the INNER frag" /&gt; </code></pre> <p>Currently, the above code can run without errors. But it is actually changing <code>InnerFrag</code> as the new child of <code>MainActivity</code>. This can be verified by the two System Print Out statements that the Before: Object and the After: Object is changed. In the <code>OuterFrag.java</code>, if the <code>getChildFragmentManager()</code> statements are run instead of the <code>getFragmentManager()</code> statements, we will get the following runtime error:</p> <pre><code>12-07 02:29:38.406: E/AndroidRuntime(12051): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.frag/com.example.frag.MainActivity}: java.lang.IllegalArgumentException: No view found for id 0x7f070000 (com.example.frag:id/frameLayout) for fragment InnerFrag{46e32748 #0 id=0x7f070000} </code></pre> <p>Using <code>getChildFragmentManager()</code> is theoretically correct. It can be used in a non-programmatically added fragment (which means changing <code>activity_main.xml</code>'s <code>&lt;FrameLayout&gt;</code> to <code>&lt;fragment&gt;</code>, add attribute <code>android:name="com.example.frag.OuterFrag"</code>, and remove the first <code>getSupportFragmentManager()</code> statement in <code>MainActivity.java</code>). And it is keeping the correct hierarchy: <code>MainActivity -&gt; OuterFrag -&gt; InnerFrag</code>. But the words of original fragment (<code>outer_frag.xml</code>) can never be taken away.</p> <p>In conclusion, I want to reference <code>OuterFrag</code> in <code>MainActivity</code> always. And I want <code>OuterFrag</code> act as a placeholder to load different <code>InnerFrag</code>s. In short, I want to call <code>getChildFragmentManager()</code> in <code>OuterFrag</code>, when it is added programmatically (dynamically).</p>
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