Position of DialogFragment in Android

问题

I have a DialogFragment to show a View like a Popup screen. The Window appears always in the middle of the screen. Is there a way to set the position of the DialogFragment window? I have looked in to the source code but couldn\'t find anything yet.

回答1:

Try something like this:

@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState)
{
    getDialog().getWindow().setGravity(Gravity.CENTER_HORIZONTAL | Gravity.TOP);
    WindowManager.LayoutParams p = getDialog().getWindow().getAttributes();
    p.width = ViewGroup.LayoutParams.MATCH_PARENT;
    p.softInputMode = WindowManager.LayoutParams.SOFT_INPUT_STATE_ALWAYS_VISIBLE;
    p.x = 200;
    ...
    getDialog().getWindow().setAttributes(p);
    ...

or other methods for getDialog().getWindow().

be sure to set the position after calling set-content.

回答2:

Right, I banged head against wall for an hour or two with this, before finally getting DialogFragment positioned like I wanted.

I'm building on Steelight's answer here. This is the simplest, most reliable approach I found.

@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle b) {
    Window window = getDialog().getWindow();

    // set "origin" to top left corner, so to speak
    window.setGravity(Gravity.TOP|Gravity.LEFT);

    // after that, setting values for x and y works "naturally"
    WindowManager.LayoutParams params = window.getAttributes();
    params.x = 300;
    params.y = 100;
    window.setAttributes(params);

    Log.d(TAG, String.format("Positioning DialogFragment to: x %d; y %d", params.x, params.y));
} 

Note that params.width and params.softInputMode (used in Steelight's answer) are irrelevant for this.

---

Below is a more complete example. What I really needed was to align a "confirm box" DialogFragment next to a "source" or "parent" View, in my case an ImageButton.

I chose to use DialogFragment, instead of any custom Fragment, because it gives you "dialog" features for free (close dialog when user clicks outside of it, etc).

^{Example ConfirmBox above its "source" ImageButton (trashcan)}

/**
 * A custom DialogFragment that is positioned above given "source" component.
 *
 * @author Jonik, https://stackoverflow.com/a/20419231/56285
 */
public class ConfirmBox extends DialogFragment {
    private View source;

    public ConfirmBox() {
    }

    public ConfirmBox(View source) {
        this.source = source;            
    }

    public static ConfirmBox newInstance(View source) {
        return new ConfirmBox(source);
    }

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

        setStyle(STYLE_NO_FRAME, R.style.Dialog);
    }


    @Override
    public void onStart() {
        super.onStart();

        // Less dimmed background; see https://stackoverflow.com/q/13822842/56285
        Window window = getDialog().getWindow();
        WindowManager.LayoutParams params = window.getAttributes();
        params.dimAmount = 0.2f; // dim only a little bit
        window.setAttributes(params);

        // Transparent background; see https://stackoverflow.com/q/15007272/56285
        // (Needed to make dialog's alpha shadow look good)
        window.setBackgroundDrawableResource(android.R.color.transparent);
    }

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
        // Put your dialog layout in R.layout.view_confirm_box
        View view = inflater.inflate(R.layout.view_confirm_box, container, false);

        // Initialise what you need; set e.g. button texts and listeners, etc.

        // ...

        setDialogPosition();

        return view;
    }

    /**
     * Try to position this dialog next to "source" view
     */
    private void setDialogPosition() {
        if (source == null) {
            return; // Leave the dialog in default position
        }

        // Find out location of source component on screen
        // see https://stackoverflow.com/a/6798093/56285
        int[] location = new int[2];
        source.getLocationOnScreen(location);
        int sourceX = location[0];
        int sourceY = location[1];

        Window window = getDialog().getWindow();

        // set "origin" to top left corner
        window.setGravity(Gravity.TOP|Gravity.LEFT);

        WindowManager.LayoutParams params = window.getAttributes();

        // Just an example; edit to suit your needs.
        params.x = sourceX - dpToPx(110); // about half of confirm button size left of source view
        params.y = sourceY - dpToPx(80); // above source view

        window.setAttributes(params);
    }

    public int dpToPx(float valueInDp) {
        DisplayMetrics metrics = getActivity().getResources().getDisplayMetrics();
        return (int) TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP, valueInDp, metrics);
    }
}

It's quite easy to make the above more general-use by adding constructor parameters or setters as necessary. (My final ConfirmBox has a styled button (inside some borders etc) whose text and View.OnClickListener can be customised in code.)

回答3:

getDialog().getWindow() will not work for a DialogFragment as getWindow() will return null if the hosting activity is not visible, which it isn't if you're writing a fragment-based app. You will get a NullPointerException when you try getAttributes().

I recommend Mobistry's answer. If you already have a DialogFragment class, it's not too hard to switch over. Just replace the onCreateDialog method with one that constructs and returns a PopupWindow. Then you should be able to reuse the View you supply to AlertDialog.builder.setView(), and call (PopupWindow object).showAtLocation().

回答4:

You need to override onResume() method in your DialogFragment like following:

@Override
public void onResume() {
    final Window dialogWindow = getDialog().getWindow();
    WindowManager.LayoutParams lp = dialogWindow.getAttributes();
    lp.x = 100;        // set your X position here
    lp.y = 200;        // set your Y position here
    dialogWindow.setAttributes(lp);

    super.onResume();
}

回答5:

I am using PopupWindow class for this purpose because you can specify the location and size of the view.

回答6:

@Override
public Dialog onCreateDialog(Bundle savedInstanceState) {
    Dialog dialog = new Dialog(mActivity, R.style.BottomDialog);
    dialog.requestWindowFeature(Window.FEATURE_NO_TITLE); // 
    dialog.setContentView(R.layout.layout_video_live);
    dialog.setCanceledOnTouchOutside(true);

    Window window = dialog.getWindow();
    assert window != null;
    WindowManager.LayoutParams lp = window.getAttributes();
    lp.gravity = Gravity.BOTTOM; //psotion
    lp.width = WindowManager.LayoutParams.MATCH_PARENT; // fuill screen
    lp.height = 280;
    window.setAttributes(lp);
    return dialog;
}

回答7:

I am using AppCompatDialogFragment from android.support.v7.app.AppCompatDialogFragment and I want to align dialog fragment to bottom of the screen and also remove all borders, especially I needed to set content width to match parent.

So, I wanted from this (yellow background comes from rootLayout of dialog fragment):

Get this:

None of solutions aboved worked. So, I managed to do this:

fun AppCompatDialogFragment.alignToBottom() {
    dialog.window.apply {
        setGravity(Gravity.BOTTOM or Gravity.CENTER_HORIZONTAL)
        decorView.apply {

            // Get screen width
            val displayMetrics = DisplayMetrics().apply {
                windowManager.defaultDisplay.getMetrics(this)
            }

            setBackgroundColor(Color.WHITE) // I don't know why it is required, without it background of rootView is ignored (is transparent even if set in xml/runtime)
            minimumWidth = displayMetrics.widthPixels
            setPadding(0, 0, 0, 0)
            layoutParams = LayoutParams(LayoutParams.MATCH_PARENT, LayoutParams.WRAP_CONTENT)
            invalidate()
        }
    }
}

来源：https://stackoverflow.com/questions/9698410/position-of-dialogfragment-in-android