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POHow to launch a PopupWindow or Dialog from an input method service?
 

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    <p>I get the same exception when I try to pop a PopupWindow (or Dialog) from InputMethodService:</p> <pre><code>FATAL EXCEPTION: main android.view.WindowManager$BadTokenException: Unable to add window -- token null is not valid; is your activity running? at android.view.ViewRoot.setView(ViewRoot.java:505) at android.view.WindowManagerImpl.addView(WindowManagerImpl.java:177) at android.view.WindowManagerImpl.addView(WindowManagerImpl.java:91) at android.widget.PopupWindow.invokePopup(PopupWindow.java:828) at android.widget.PopupWindow.showAtLocation(PopupWindow.java:688) at mypackage.MyInputMethodService.onClick(MyInputMethodService.java:123) ... </code></pre> <p>If I try to pop a Dialog instead, I get the exact same exception in the exact same line of ViewRoot.java. Here is my code (abridged):</p> <pre><code>public class MyInputMethodService extends InputMethodService implements View.OnClickListener { public void onClick(View v) { // This is the handler for View.OnClickListener LayoutInflater inflater = (LayoutInflater) this.getSystemService(Context.LAYOUT_INFLATER_SERVICE); PopupWindow pw = new PopupWindow(inflater.inflate(R.layout.popup_example, null, false), 100, 100, true); pw.showAtLocation(mInputView, Gravity.CENTER, 0, 0); // mInputView was previously created and returned by onCreateInputView() } } // end of MyInputMethodService </code></pre> <p>and</p> <pre><code>&lt;?xml version="1.0" encoding="utf-8"?&gt; &lt;LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:orientation="vertical" android:padding="10dip" android:layout_width="fill_parent" android:layout_height="wrap_content" &gt; &lt;TextView android:layout_width="fill_parent" android:layout_height="wrap_content" android:layout_marginTop="10dip" android:text="Test Pop-Up" /&gt; &lt;/LinearLayout&gt; </code></pre> <p>I've tried many variations of the above code but always get the same exception for PopupWindows and Dialogs. For some reason Toast alerts work. Is there a special technique for launching a PopupWindow or Dialog from a <strong>Service</strong> (specifically an InputMethodService), as opposed to an Activity?</p> <p>Thanks in advance,</p> <p>Barry</p>
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