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POButton Listener for button in fragment in android
 

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    <p>I am new to Android and trying to learn on my own. But I am having a tough time with Fragments. I am creating a simple application to learn fragments. I think it may seem silly but I really can't get this to work.</p> <p>All I want to do is on the click of a button (buttonSayHi) in Fragment_One, Fragment_One should be replaced by Fragment_Two.</p> <p>I am not sure when the Fragment code is called and where am I supposed to write my code to call the second fragment. I get the error: Unable to start Activity component.</p> <p>However, the code works fine if I discard the listener for button and the fragment is displayed within the activity.</p> <p>I have done considerable research, read the fragments tutorial on developer.android.com and also the tutorial by Lars Vogella. I think my concepts are not clear.</p> <p>Any help will be appreciated.</p> <p>The following is the code:</p> <p>activity_main.xml</p> <pre><code>&lt;FrameLayout xmlns:android="http://schemas.android.com/apk/res/android" android:id="@+id/frameLayoutFragmentContainer" android:layout_width="fill_parent" android:layout_height="fill_parent" &gt; &lt;/FrameLayout&gt; </code></pre> <p>fragment_one.xml</p> <pre><code>&lt;?xml version="1.0" encoding="utf-8"?&gt; &lt;LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="fill_parent" android:layout_height="fill_parent" android:orientation="vertical" &gt; &lt;EditText android:id="@+id/editTextPersonName" android:layout_width="fill_parent" android:layout_height="wrap_content" android:ems="10" android:inputType="textPersonName" &gt; &lt;requestFocus /&gt; &lt;/EditText&gt; &lt;Button android:id="@+id/buttonSayHi" android:layout_width="fill_parent" android:layout_height="wrap_content" android:text="Say Hi" android:onClick="onButtonClicked"/&gt; &lt;/LinearLayout&gt; </code></pre> <p>fragment_two.xml</p> <pre><code>&lt;?xml version="1.0" encoding="utf-8"?&gt; &lt;LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="fill_parent" android:layout_height="fill_parent" android:orientation="vertical" &gt; &lt;TextView android:id="@+id/textViewResult" android:layout_width="fill_parent" android:layout_height="wrap_content" android:text="I will say Hi!" /&gt; &lt;/LinearLayout&gt; </code></pre> <p>MainActivity.java</p> <pre><code>package com.example.fragmenttutorial; import android.os.Bundle; import android.view.View; import android.widget.Button; import android.app.Activity; import android.app.Fragment; import android.app.FragmentManager; import android.app.FragmentTransaction; public class MainActivity extends Activity{ View view; FragmentManager fragmentManager = getFragmentManager(); FragmentTransaction fragmentTransaction = fragmentManager.beginTransaction(); @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); Fragment fragmentOne = new FragmentOne(); fragmentTransaction.add(R.id.frameLayoutFragmentContainer, fragmentOne); fragmentTransaction.addToBackStack(null); fragmentTransaction.commit(); } protected void onButtonClicked() { if(view.getId() == R.id.buttonSayHi){ Fragment fragmentTwo = new FragmentTwo(); fragmentTransaction.replace(R.id.frameLayoutFragmentContainer, fragmentTwo); fragmentTransaction.addToBackStack(null); fragmentTransaction.commit(); } } } </code></pre> <p>FragmentOne.java</p> <pre><code>package com.example.fragmenttutorial; import android.app.Fragment; import android.app.FragmentManager; import android.app.FragmentTransaction; import android.os.Bundle; import android.view.LayoutInflater; import android.view.View; import android.view.ViewGroup; public class FragmentOne extends Fragment{ View view; FragmentManager fragmentManager = getFragmentManager(); FragmentTransaction fragmentTransaction = fragmentManager.beginTransaction(); @Override public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) { View view = inflater.inflate(R.layout.fragment_one, container, false); return view; } // protected void onButtonClicked() // { // if(view.getId() == R.id.buttonSayHi){ // Fragment fragmentTwo = new FragmentTwo(); // // fragmentTransaction.replace(R.id.frameLayoutFragmentContainer, fragmentTwo); // fragmentTransaction.addToBackStack(null); // // fragmentTransaction.commit(); // // } // // } } </code></pre> <p>I have commented out the on click code in the fragment. I have also tried implementing the onClickListener in the fragment.</p> <p>FragmentTwo.java</p> <pre><code>package com.example.fragmenttutorial; import android.app.Fragment; import android.os.Bundle; import android.view.LayoutInflater; import android.view.View; import android.view.ViewGroup; public class FragmentTwo extends Fragment{ @Override public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) { View view = inflater.inflate(R.layout.fragment_two, container, false); return view; } } </code></pre> <p>EDIT: I have removed the line android:onClick="onButtonClicked" from my code in XML. And edited the following files but it still does not work. Can you guys provide me a working example without the android:onClick="onButtonClicked" line.</p> <p>MainActivity.java</p> <pre><code>package com.example.fragmenttutorial; import android.os.Bundle; import android.view.View; import android.app.Activity; import android.app.Fragment; import android.app.FragmentManager; import android.app.FragmentTransaction; public class MainActivity extends Activity{ View view; Fragment fragmentOne; FragmentManager fragmentManager = getFragmentManager(); FragmentTransaction fragmentTransaction = fragmentManager.beginTransaction(); @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); fragmentOne = new FragmentOne(); fragmentTransaction.add(R.id.frameLayoutFragmentContainer, fragmentOne); fragmentTransaction.addToBackStack(null); fragmentTransaction.commit(); } } </code></pre> <p>FragmentOne.java</p> <pre><code>package com.example.fragmenttutorial; import android.app.Fragment; import android.app.FragmentManager; import android.app.FragmentTransaction; import android.os.Bundle; import android.view.LayoutInflater; import android.view.View; import android.view.View.OnClickListener; import android.view.ViewGroup; import android.widget.Button; public class FragmentOne extends Fragment implements OnClickListener{ View view; Fragment fragmentTwo; FragmentManager fragmentManager = getFragmentManager(); FragmentTransaction fragmentTransaction = fragmentManager.beginTransaction(); @Override public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) { View view = inflater.inflate(R.layout.fragment_one, container, false); Button buttonSayHi = (Button) view.findViewById(R.id.buttonSayHi); buttonSayHi.setOnClickListener(this); return view; } @Override public void onClick(View v) { fragmentTwo = new FragmentTwo(); fragmentTransaction.replace(R.id.frameLayoutFragmentContainer, fragmentTwo); fragmentTransaction.addToBackStack(null); fragmentTransaction.commit(); } } </code></pre> <p>Thank you for your valuable suggestions.</p>
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    1. COonClick takes a view as a parameter `protected void onButtonClicked(View V)`
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    2. CO...and the method must also be public...not protected.
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    3. CO@Bot check this http://stackoverflow.com/questions/6091194/how-to-handle-button-clicks-using-the-xml-onclick-within-fragments
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