title: How to correctly show a popup menu below a TextView, similar to Spinner?
body: <h2>Background</h2>
  
  <p>I had to create a spinner-like view, which has this behavior:</p>
  
  <ul>
  <li>textView that has the selected item text in it, with an arrow icon on the right that indicates whether it's in "open" state.</li>
  <li>upon clicking the view, a popup menu appears below it (not on top), showing a list of items to choose from, and has the selected item marked as well.</li>
  <li>around the popupWindow, there is a semi-transparent black color.</li>
  <li>has a customized animation for opening and closing it.</li>
  </ul>
  
  <h2>The problem</h2>
  
  <p>I have succeeded making this view (code below), but for some reason, on Android 7.1, I got the popup menu to appear on top of the view (even overlapping it and views above it), instead of below it, as it should. Here's how it looks like, vs how it should look like:</p>
  
  <p><a href="https://i.stack.imgur.com/qEAgu.png"><img src="https://i.stack.imgur.com/qEAgu.png" alt="enter image description here"></a></p>
  
  <p>Since it's quite a lot of code and resources, I've put it all in a Github repository (<a href="https://github.com/AndroidDeveloperLB/FullSizePopupSpinner"><strong>here</strong></a>), but here's the main part of the code (my tries of fixing it are in comments) :</p>
  
  <p><strong>FullSizePopupSpinner.java</strong></p>
  
  <pre><code>public class FullSizePopupSpinner extends android.support.v7.widget.AppCompatTextView {
      private static final long ANIMATION_DURATION = 150;
      private int[] mItemsTextsResIds, mItemsIconsResIds;
      private int mSelectedItemPosition = -1;
      private SpinnerPopupWindow mPopupWindow;
      private boolean mInitialized = false;
      private OnItemSelectedListener mOnItemSelectedListener;
      private Drawable mClosedDrawable;
      private Drawable mOpenedDrawable;
  
      public interface OnItemSelectedListener {
          void onItemSelected(FullSizePopupSpinner parent, int position, String item, int previousSelectedPosition);
  
          void onNothingSelected(FullSizePopupSpinner parent);
      }
  
      public FullSizePopupSpinner(final Context context) {
          super(context);
          init(context);
      }
  
      public FullSizePopupSpinner(final Context context, final AttributeSet attrs) {
          super(context, attrs);
          init(context);
      }
  
      public FullSizePopupSpinner(final Context context, final AttributeSet attrs, final int defStyleAttr) {
          super(context, attrs, defStyleAttr);
          init(context);
      }
  
      @Override
      public Parcelable onSaveInstanceState() {
          Parcelable superState = super.onSaveInstanceState();
          SavedState ss = new SavedState(superState);
          ss.mSelectedItemPosition = this.mSelectedItemPosition;
          ss.mItemsTextsResIds = mItemsTextsResIds;
          ss.mItemsIconsResIds = mItemsIconsResIds;
          return ss;
      }
  
      @Override
      public void onRestoreInstanceState(Parcelable state) {
          if (!(state instanceof SavedState)) {
              super.onRestoreInstanceState(state);
              return;
          }
          SavedState ss = (SavedState) state;
          super.onRestoreInstanceState(ss.getSuperState());
          setItems(ss.mItemsTextsResIds, ss.mItemsIconsResIds);
          setSelectedItemPosition(ss.mSelectedItemPosition);
      }
  
      public void setItems(final int[] itemsTextsResIds, final int[] itemsIconsResIds) {
          mItemsTextsResIds = itemsTextsResIds;
          mItemsIconsResIds = itemsIconsResIds;
          if (mItemsTextsResIds != null &amp;&amp; mSelectedItemPosition &gt;= 0 &amp;&amp; mSelectedItemPosition &lt; mItemsTextsResIds.length)
              setText(mItemsTextsResIds[mSelectedItemPosition]);
          TextViewCompat.setCompoundDrawablesRelativeWithIntrinsicBounds(this, null, null, isPopupShown() ? mOpenedDrawable : mClosedDrawable, null);
      }
  
      public boolean isPopupShown() {
          return mPopupWindow != null &amp;&amp; mPopupWindow.isShowing();
      }
  
      public int getSelectedItemPosition() {
          return mSelectedItemPosition;
      }
  
      public void setSelectedItemPosition(final int selectedItemPosition) {
          int lastSelectedItemPosition = mSelectedItemPosition;
          mSelectedItemPosition = selectedItemPosition;
          final String itemText = mItemsTextsResIds != null &amp;&amp; mSelectedItemPosition &gt;= 0 &amp;&amp; mSelectedItemPosition &lt; mItemsTextsResIds.length ?
                  getResources().getString(mItemsTextsResIds[mSelectedItemPosition]) : null;
          setText(itemText);
          TextViewCompat.setCompoundDrawablesRelativeWithIntrinsicBounds(FullSizePopupSpinner.this, null, null, mClosedDrawable, null);
          if (mOnItemSelectedListener != null)
              mOnItemSelectedListener.onItemSelected(FullSizePopupSpinner.this, selectedItemPosition, itemText, lastSelectedItemPosition);
      }
  
      public void setOnItemSelectedListener(OnItemSelectedListener onItemSelectedListener) {
          mOnItemSelectedListener = onItemSelectedListener;
      }
  
      @Override
      protected void onDetachedFromWindow() {
          super.onDetachedFromWindow();
          if (mPopupWindow != null)
              mPopupWindow.dismissRightAway();
      }
  
      protected void init(final Context context) {
          if (mInitialized)
              return;
          mInitialized = true;
          setSaveEnabled(true);
          mClosedDrawable = ResourcesCompat.getDrawable(getResources(), R.drawable.drop_down_menu_ic_arrow_down, null);
          mOpenedDrawable = ViewUtil.getRotateDrawable(mClosedDrawable, 180);
          TextViewCompat.setCompoundDrawablesRelativeWithIntrinsicBounds(FullSizePopupSpinner.this, null, null, mClosedDrawable, null);
  
          setOnClickListener(new OnClickListener() {
              @Override
              public void onClick(final View v) {
                  if (mItemsTextsResIds == null)
                      return;
                  if (mPopupWindow != null)
                      mPopupWindow.dismissRightAway();
                  TextViewCompat.setCompoundDrawablesRelativeWithIntrinsicBounds(FullSizePopupSpinner.this, null, null, mOpenedDrawable, null);
                  LayoutInflater layoutInflater = LayoutInflater.from(context);
                  final View popupView = layoutInflater.inflate(R.layout.spinner_drop_down_popup, null, false);
                  final LinearLayout linearLayout = (LinearLayout) popupView.findViewById(R.id.spinner_drop_down_popup__itemsContainer);
                  final View overlayView = popupView.findViewById(R.id.spinner_drop_down_popup__overlay);
                  linearLayout.setPivotY(0);
                  linearLayout.setScaleY(0);
                  linearLayout.animate().scaleY(1).setDuration(ANIMATION_DURATION).start();
                  mPopupWindow = new SpinnerPopupWindow(popupView, LayoutParams.MATCH_PARENT, LayoutParams.MATCH_PARENT, true, overlayView, linearLayout);
                  mPopupWindow.setOutsideTouchable(true);
                  mPopupWindow.setTouchable(true);
                  mPopupWindow.setBackgroundDrawable(new ColorDrawable(0));
                  //PopupWindowCompat.setOverlapAnchor(mPopupWindow, false);
                  //if (VERSION.SDK_INT &gt;= VERSION_CODES.M)
                  //    mPopupWindow.setOverlapAnchor(false);
                  final AtomicBoolean isItemSelected = new AtomicBoolean(false);
                  if (VERSION.SDK_INT &gt;= VERSION_CODES.LOLLIPOP) {
                      popupView.findViewById(R.id.spinner_drop_down_popup__preLollipopShadow).setVisibility(View.GONE);
                      linearLayout.setBackgroundColor(0xFFffffff);
                  }
                  for (int i = 0; i &lt; mItemsTextsResIds.length; ++i) {
                      final String itemText = getResources().getString(mItemsTextsResIds[i]);
                      final int position = i;
                      View itemView = layoutInflater.inflate(R.layout.spinner_drop_down_popup_item, linearLayout, false);
                      final TextView textView = (TextView) itemView.findViewById(android.R.id.text1);
                      textView.setText(itemText);
                      if (mItemsIconsResIds != null)
                          TextViewCompat.setCompoundDrawablesRelativeWithIntrinsicBounds(textView, mItemsIconsResIds[position], 0,
                                  position == mSelectedItemPosition ? R.drawable.drop_down_menu_ic_v : 0, 0);
                      else
                          TextViewCompat.setCompoundDrawablesRelativeWithIntrinsicBounds(textView, 0, 0, position == mSelectedItemPosition ? R.drawable.drop_down_menu_ic_v : 0, 0);
  
                      linearLayout.addView(itemView, linearLayout.getChildCount() - 2);
                      itemView.setOnClickListener(new OnClickListener() {
                          @Override
                          public void onClick(final View v) {
                              isItemSelected.set(true);
                              mPopupWindow.dismiss();
                              setSelectedItemPosition(position);
                          }
                      });
                  }
                  overlayView.setOnClickListener(new OnClickListener() {
                      @Override
                      public void onClick(final View v) {
                          mPopupWindow.dismiss();
                      }
                  });
                  overlayView.setAlpha(0);
                  overlayView.animate().alpha(1).setDuration(ANIMATION_DURATION).start();
                  mPopupWindow.setOnDismissListener(new OnDismissListener() {
                      @Override
                      public void onDismiss() {
                          TextViewCompat.setCompoundDrawablesRelativeWithIntrinsicBounds(FullSizePopupSpinner.this, null, null, mClosedDrawable, null);
                          if (!isItemSelected.get() &amp;&amp; mOnItemSelectedListener != null)
                              mOnItemSelectedListener.onNothingSelected(FullSizePopupSpinner.this);
                      }
                  });
                  // optional: set animation style. look here for more info: http://stackoverflow.com/q/9648797/878126
                  mPopupWindow.setAnimationStyle(0);
                  //PopupWindowCompat.showAsDropDown(mPopupWindow, v, 0, 0, Gravity.TOP);
                  //mPopupWindow.showAsDropDown(v, 0, 0, Gravity.TOP);
                  mPopupWindow.showAsDropDown(v, 0, 0);
              }
          });
  
      }
  
      static class SpinnerPopupWindow extends PopupWindow {
          private final View mOverlayView;
          private final View mLayout;
  
          public SpinnerPopupWindow(final View contentView, final int width, final int height, final boolean focusable, View overlayView, View layout) {
              super(contentView, width, height, focusable);
              mOverlayView = overlayView;
              mLayout = layout;
          }
  
          public void dismissRightAway() {
              super.dismiss();
          }
  
  
          @Override
          public void dismiss() {
              final ViewPropertyAnimator animator = mOverlayView.animate().alpha(0);
              mLayout.setPivotY(0);
              mLayout.animate().scaleY(0).setDuration(ANIMATION_DURATION);
              ViewUtil.runOnAnimationEnd(animator, new Runnable() {
                  @Override
                  public void run() {
                      dismissRightAway();
                  }
              });
              animator.start();
          }
      }
  
      //////////////////////////////////////
      //SavedState//
      //////////////
      static class SavedState extends BaseSavedState {
          private int[] mItemsTextsResIds;
          private int mSelectedItemPosition = -1;
          public int[] mItemsIconsResIds;
  
          SavedState(Parcelable superState) {
              super(superState);
          }
  
          private SavedState(@NonNull Parcel in) {
              super(in);
              this.mItemsTextsResIds = in.createIntArray();
              mSelectedItemPosition = in.readInt();
              mItemsIconsResIds = in.createIntArray();
          }
  
          @Override
          public void writeToParcel(@NonNull Parcel out, int flags) {
              super.writeToParcel(out, flags);
              out.writeIntArray(mItemsTextsResIds);
              out.writeInt(mSelectedItemPosition);
              out.writeIntArray(mItemsIconsResIds);
          }
  
          //required field that makes Parcelables from a Parcel
          public static final Creator&lt;SavedState&gt; CREATOR =
                  new Creator&lt;SavedState&gt;() {
                      public SavedState createFromParcel(Parcel in) {
                          return new SavedState(in);
                      }
  
                      public SavedState[] newArray(int size) {
                          return new SavedState[size];
                      }
                  };
      }
  }
  </code></pre>
  
  <h2>What I've tried</h2>
  
  <p>I tried calling the next functions (and combinations), but none helped:</p>
  
  <ul>
  <li><p>mPopupWindow.setOverlapAnchor(false);</p></li>
  <li><p>PopupWindowCompat.setOverlapAnchor(mPopupWindow,false);</p></li>
  <li><p>mPopupWindow.showAsDropDown(v, 0, 0, Gravity.BOTTOM);</p></li>
  <li><p>PopupWindowCompat.showAsDropDown(mPopupWindow,v, 0, 0, Gravity.BOTTOM);</p></li>
  <li><p>mPopupWindow.showAsDropDown(v, 0, 0, Gravity.TOP);</p></li>
  <li><p>PopupWindowCompat.showAsDropDown(mPopupWindow,v, 0, 0, Gravity.TOP);</p></li>
  </ul>
  
  <h2>The question</h2>
  
  <p>Why does the popup window appear on top of the view? How can I avoid this, and still have the window below the view, as was done before?</p>
  
  <p>Is there maybe a bug on Android 7.1 , which causes this behavior? How can I overcome this?</p>