如何从input法服务启动PopupWindow或Dialog?

当我尝试从InputMethodServicepopup一个PopupWindow(或Dialog)时,我得到相同的exception:

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) ... 

如果我尝试popup一个对话框,我得到完全相同的exception在同一行ViewRoot.java。 这是我的代码(删节):

 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 

 <?xml version="1.0" encoding="utf-8"?> <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" > <TextView android:layout_width="fill_parent" android:layout_height="wrap_content" android:layout_marginTop="10dip" android:text="Test Pop-Up" /> </LinearLayout> 

我已经尝试了上面的代码的许多变化,但总是得到PopupWindows和对话框相同的exception。 出于某种原因吐司警报工作。 有没有一种特殊的技术,从一个服务 (特别是一个InputMethodService),而不是一个活动启动一个PopupWindow或对话框?

提前致谢,

巴里

Solutions Collecting From Web of "如何从input法服务启动PopupWindow或Dialog?"

其实我设法做到这一点:

  AlertDialog.Builder builder = new AlertDialog.Builder(this); builder.setTitle("Make your selection"); builder.setItems(items, new DialogInterface.OnClickListener() { public void onClick(DialogInterface dialog, int item) { // Do something with the selection } }); AlertDialog alert = builder.create(); Window window = alert.getWindow(); WindowManager.LayoutParams lp = window.getAttributes(); lp.token = mInputView.getWindowToken(); lp.type = WindowManager.LayoutParams.TYPE_APPLICATION_ATTACHED_DIALOG; window.setAttributes(lp); window.addFlags(WindowManager.LayoutParams.FLAG_ALT_FOCUSABLE_IM); alert.show();