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POWhere do I define my OnClickListener to close a custom dialog view in Android?
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  1. POWhere do I define my OnClickListener to close a custom dialog view in Android?
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    copied!<p>I have defined the following custom dialog view:</p> <pre><code>public class MyDialog extends Dialog { public MyDialog(Context context) { super(context); } @Override protected void onCreate(Bundle savedInstanceState){ super.onCreate(savedInstanceState); setContentView(R.layout.my_dialog); getWindow().setLayout(LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT); } } </code></pre> <p>The dialog uses the following layout which contains only a "Dismiss Me" button:</p> <pre><code>&lt;?xml version="1.0" encoding="utf-8"?&gt; &lt;RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_gravity="center_horizontal" &gt; &lt;Button android:id="@+id/dismiss_btn" android:layout_width="100dip" android:layout_height="30dip" android:layout_centerHorizontal="true" android:text="Dismiss me" android:textSize="8dip" android:textColor="#ffffff" /&gt; &lt;/RelativeLayout&gt; </code></pre> <p>My <code>MainActivity</code> displays a button, <code>triggerDialogBtn</code>, which will show my dialog when pressed. I also defined a handler method for the button <code>dismiss_btn</code> on my dialog which is intended to dismiss my dialog when pressed.</p> <pre><code>public class MainActivity extends Activity{ private Button triggerDialogBtn; private MyDialog myDialog; @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); //initialize my dialog myDialog = new MyDialog(this); //the button which will trigger the dialog to pop up Button triggerDialogBtn = (Button)findViewById(R.id.trigger_btn); triggerDialogBtn.setOnClickListener(new OnClickListener() { @Override public void onClick(View v) { myDialog.show(); //my dialog pop up } }); // I would like to dismiss my dialog when the "Dismiss me" button on the dialog is pressed /**** BUT I GOT NULL POINTER EXCEPTION HERE ******/ //This is the "Dismiss me" button defined on dialog layout Button dismissMeBtn = (Button)findViewById(R.id.dismiss_btn); dismissMeBtn.setOnClickListener(new OnClickListener() { @Override public void onClick(View v) { myDialog.dismiss(); } }); } } </code></pre> <p>Layout of <code>main.xml</code>:</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"&gt; &lt;!-- The trigger button which will pop up my dialog when pressed --&gt; &lt;Button android:id="@+id/trigger_btn" android:layout_width="80dip" android:layout_height="20dip" android:text="Trigger dialog" /&gt; &lt;/LinearLayout&gt; </code></pre> <p>The problem is that if I define the click handler for <code>dismiss_btn</code> (which is located on my dialog ) inside <code>MainActivity</code>, I cannot dismiss the dialog when <code>dismiss_btn</code> is pressed; it always throws <code>NullPointerException</code>. </p> <p>So, where and how can I define the handler to dismiss my dialog when the button on my dialog is pressed? </p> <h3>UPDATED</h3> <p>I also tried to put the <code>dismiss_btn</code> handler in my custom dialog view class as below:</p> <pre><code>public class MyDialog extends Dialog { public MyDialog(Context context) { super(context); } @Override protected void onCreate(Bundle savedInstanceState){ super.onCreate(savedInstanceState); setContentView(R.layout.my_dialog); Button dismissMeBtn = (Button)findViewById(R.id.dismiss_btn); //ERROR: The method setOnClickListener(View.OnClickListener) in the // type View is not applicable // for the arguments (new DialogInterface.OnClickListener(){}) dismissMeBtn.setOnClickListener(new OnClickListener() { @Override public void onClick(View v) { ???.dismiss(); // What should replace "???" } }); getWindow().setLayout(LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT); } } </code></pre> <p>I get the indicated error don't know what to replace the question marks with.</p>
 

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