我正在使用PopupWindow类，因为您可以指定视图的位置和大小。

getDialog().getWindow()如果托管活动不可见，则无法使用DialogFragmentas getWindow()将返回null，如果您正在编写基于片段的应用程序，则不会。NullPointerException你尝试的时候会得到一个getAttributes()。

我推荐Mobistry的答案。如果您已经有一个DialogFragment类，那么切换并不困难。只需将onCreateDialog方法替换为构造并返回PopupWindow的方法。然后，您应该能够重复使用您提供的View AlertDialog.builder.setView()，并进行调用(PopupWindow object).showAtLocation()。

是的，我用头撞了一两个小时，然后最终DialogFragment像我想要的那样定位。

我正在建立在Steelight的答案上。这是我发现的最简单，最可靠的方法。

@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));
} 

请注意，params.width和 params.softInputMode（在Steelight的答案中使用）与此无关。

下面是一个更完整的例子。我真正需要的是在“源”或“父”视图旁边对齐“确认框”DialogFragment，在我的例子中是一个ImageButton。

我选择使用DialogFragment，而不是任何自定义片段，因为它为您提供免费的“对话框”功能（当用户在其外部点击时关闭对话框等）。

^{示例在其“源”ImageButton（垃圾桶）上方的ConfirmBox}

/**
 * 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);
    }
}

通过根据需要添加构造函数参数或setter，可以很容易地使上述更通用。（我的决赛ConfirmBox有一个样式按钮（在一些边框内等），其文本View.OnClickListener可以在代码中自定义。）

您需要覆盖DialogFragment中的onResume（）方法，如下所示：

@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();
}

@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;
}

我使用AppCompatDialogFragment的android.support.v7.app.AppCompatDialogFragment，我想对话片段对齐到屏幕下方，并删除所有边界，特别是我需要设置内容宽度匹配父。

所以，我想从这里（黄色背景来自对话框片段的rootLayout）：

得到这个：

上述解决方案都没有奏效。所以，我成功地做到了这一点：

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()
        }
    }
}

当我遇到这个问题时，这就是我解决的问题。试试这个。

在您的DialogFragment的onActivityCreated中，根据您的需要添加此代码....

 @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
                             Bundle savedInstanceState) {
        // Inflate the layout for this fragment
        myview=inflater.inflate(R.layout.fragment_insurance_detail, container, false);
        intitviews();
        return myview;
    }
    @Override
    public void onActivityCreated(Bundle arg0) {
        super.onActivityCreated(arg0);
        getDialog().getWindow().getAttributes().windowAnimations = R.style.DialogAnimation;
        getDialog().getWindow().setBackgroundDrawable(new ColorDrawable(Color.TRANSPARENT));
        getDialog().getWindow().setLayout(ViewGroup.LayoutParams.MATCH_PARENT, ViewGroup.LayoutParams.WRAP_CONTENT);
        getDialog().getWindow().setGravity(Gravity.CENTER);
    }