Android IME: how to show a pop-up dialog?

问题:

I'm playing around with some keyboard development and try to show a pop-up dialog when a certain key is pressed

if (primaryCode == -301) {
            AlertDialog mDialog = new AlertDialog.Builder(CONTEXT)
            .setTitle("My dialog")
            .setMessage("Lets do it.")
            .setPositiveButton("ok", null).create();
             mDialog.show();
}

However, the problem is the CONTEXT part. In a normal application it would just be this. I also tried getApplicationContext() and getBaseContext(), but neither of those works -> keyboard crashes.

android.view.WindowManager$BadTokenException: Unable to add window -- token null is not for an application

So I'm wondering if I have to do something with InputConnection:

The InputConnection interface is the communication channel from an InputMethod back to the application that is receiving its input. It is used to perform such things as reading text around the cursor, committing text to the text box, and sending raw key events to the application.

So far I wasn't able to figure out how. I definitely know it's possible, since I have seen it before. I someone could point me in the right direction that would definitely be appreciated.

---

Update:

To provide a better picture of what I try to achieve I uploaded a screenshot of the Swype keyboard, which does exactly that: showing a pop-up dialog when a special key gets pressed on the keyboard.

回答1:

Peace be upon those who follow the guidance,

solution :

AlertDialog dialog;
//add this to your code
       dialog = builder.create();
        Window window = dialog.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);
//end addons
alert.show();

good luck.

回答2:

An IME does not run in an application context, so you can not use normal application windows. You can use a Dialog, but you will need to modify its window so that the window type is this type:

http://developer.android.com/reference/android/view/WindowManager.LayoutParams.html#TYPE_APPLICATION_PANEL

And set WindowManager.LayoutParams.token to be the token of the IME window (via View.getWindowToken()).

Note that the dialog will not be able to display pop-up windows, because in this case it is itself effectively a pop-up window. Also the coordinate space will be relative to your IME unless you use the window flags to change it.

回答3:

Make an activity and in the manifest file give that activity the attribute

android:theme="@android:style/Theme.Dialog"

回答4:

its very simple, just create activity like here (with out any view), write code of dialog in it

public class dialog extends Activity {
@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);

    AlertDialog.Builder builder = new AlertDialog.Builder(this);
    builder.setMessage("Are you sure you want to Delete All Contacts?");
    builder.setCancelable(false);

    builder.setPositiveButton("Yes",
                    new DialogInterface.OnClickListener() {
                        public void onClick(DialogInterface dialog, int id) {
                            //deleteAllContacts();
                        }//
                    });

            builder.setNegativeButton("No",
                    new DialogInterface.OnClickListener() {
                        public void onClick(DialogInterface dialog, int id) {
                            dialog.cancel();
                        }
                    });

    AlertDialog alert = builder.create();
    alert.show();

}
}

now go to Android manifest file and add activity like,

<activity android:name=".dialog" android:theme="@android:style/Theme.NoDisplay">        </activity>

its all, enjoy

回答5:

You have to get a reference to your activity context. Anyway, you should use the showDialog method of the Activity.