sl4a/QuickAction/src/net/londatiga/android/CustomPopupWindow.java

package net.londatiga.android;

import android.content.Context;
import android.graphics.Rect;
import android.graphics.drawable.BitmapDrawable;
import android.graphics.drawable.Drawable;
import android.view.Gravity;
import android.view.LayoutInflater;
import android.view.MotionEvent;
import android.view.View;
import android.view.WindowManager;
import android.view.View.OnTouchListener;
import android.view.ViewGroup.LayoutParams;
import android.widget.PopupWindow;

/**
 * This class does most of the work of wrapping the {@link PopupWindow} so it's
 * simpler to use. Edited by Lorensius. W. L. T
 * 
 * @author qberticus
 * 
 */
public class CustomPopupWindow {
  protected final View anchor;
  protected final PopupWindow window;
  private View root;
  private Drawable background = null;
  protected final WindowManager windowManager;

  /**
   * Create a QuickAction
   * 
   * @param anchor the view that the QuickAction will be displaying 'from'
   */
  public CustomPopupWindow(View anchor) {
    this.anchor = anchor;
    this.window = new PopupWindow(anchor.getContext());

    // when a touch even happens outside of the window
    // make the window go away
    window.setTouchInterceptor(new OnTouchListener() {
      @Override
      public boolean onTouch(View v, MotionEvent event) {
        if (event.getAction() == MotionEvent.ACTION_OUTSIDE) {
          CustomPopupWindow.this.window.dismiss();

          return true;
        }

        return false;
      }
    });

    windowManager = (WindowManager) anchor.getContext().getSystemService(Context.WINDOW_SERVICE);

    onCreate();
  }

  /**
   * Anything you want to have happen when created. Probably should create a
   * view and setup the event listeners on child views.
   */
  protected void onCreate() {
  }

  /**
   * In case there is stuff to do right before displaying.
   */
  protected void onShow() {
  }

  protected void preShow() {
    if (root == null) {
      throw new IllegalStateException("setContentView was not called with a view to display.");
    }

    onShow();

    if (background == null) {
      window.setBackgroundDrawable(new BitmapDrawable());
    } else {
      window.setBackgroundDrawable(background);
    }

    // if using PopupWindow#setBackgroundDrawable this is the only values of the
    // width and hight that make it work
    // otherwise you need to set the background of the root viewgroup
    // and set the popupwindow background to an empty BitmapDrawable

    window.setWidth(WindowManager.LayoutParams.WRAP_CONTENT);
    window.setHeight(WindowManager.LayoutParams.WRAP_CONTENT);
    window.setTouchable(true);
    window.setFocusable(true);
    window.setOutsideTouchable(true);

    window.setContentView(root);
  }

  public void setBackgroundDrawable(Drawable background) {
    this.background = background;
  }

  /**
   * Sets the content view. Probably should be called from {@link onCreate}
   * 
   * @param root the view the popup will display
   */
  public void setContentView(View root) {
    this.root = root;

    window.setContentView(root);
  }

  /**
   * Will inflate and set the view from a resource id
   * 
   * @param layoutResID
   */
  public void setContentView(int layoutResID) {
    LayoutInflater inflator =
        (LayoutInflater) anchor.getContext().getSystemService(Context.LAYOUT_INFLATER_SERVICE);

    setContentView(inflator.inflate(layoutResID, null));
  }

  /**
   * If you want to do anything when {@link dismiss} is called
   * 
   * @param listener
   */
  public void setOnDismissListener(PopupWindow.OnDismissListener listener) {
    window.setOnDismissListener(listener);
  }

  /**
   * Displays like a popdown menu from the anchor view
   */
  public void showDropDown() {
    showDropDown(0, 0);
  }

  /**
   * Displays like a popdown menu from the anchor view.
   * 
   * @param xOffset offset in X direction
   * @param yOffset offset in Y direction
   */
  public void showDropDown(int xOffset, int yOffset) {
    preShow();

    window.setAnimationStyle(R.style.Animations_PopDownMenu_Left);

    window.showAsDropDown(anchor, xOffset, yOffset);
  }

  /**
   * Displays like a QuickAction from the anchor view.
   */
  public void showLikeQuickAction() {
    showLikeQuickAction(0, 0);
  }

  /**
   * Displays like a QuickAction from the anchor view.
   * 
   * @param xOffset offset in the X direction
   * @param yOffset offset in the Y direction
   */
  public void showLikeQuickAction(int xOffset, int yOffset) {
    preShow();

    window.setAnimationStyle(R.style.Animations_PopUpMenu_Center);

    int[] location = new int[2];
    anchor.getLocationOnScreen(location);

    Rect anchorRect =
        new Rect(location[0], location[1], location[0] + anchor.getWidth(), location[1]
            + anchor.getHeight());

    root.setLayoutParams(new LayoutParams(LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT));
    root.measure(LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT);

    int rootWidth = root.getMeasuredWidth();
    int rootHeight = root.getMeasuredHeight();

    int screenWidth = windowManager.getDefaultDisplay().getWidth();
    // int screenHeight = windowManager.getDefaultDisplay().getHeight();

    int xPos = ((screenWidth - rootWidth) / 2) + xOffset;
    int yPos = anchorRect.top - rootHeight + yOffset;

    // display on bottom
    if (rootHeight > anchorRect.top) {
      yPos = anchorRect.bottom + yOffset;

      window.setAnimationStyle(R.style.Animations_PopDownMenu_Center);
    }

    window.showAtLocation(anchor, Gravity.NO_GRAVITY, xPos, yPos);
  }

  public void dismiss() {
    window.dismiss();
  }
}