Example usage for android.graphics.drawable ShapeDrawable setAlpha

Introduction

In this page you can find the example usage for android.graphics.drawable ShapeDrawable setAlpha.

Prototype

@Override
public void setAlpha(int alpha) 

Source Link

Document

Set the alpha level for this drawable [0..255].

Usage

From source file:com.nile.kmooc.view.custom.popup.menu.MenuPopupHelper.java

public boolean tryShow() {
    mPopup = new ListPopupWindow(mContext, null, mPopupStyleAttr, mPopupStyleRes);
    mPopup.setOnDismissListener(this);
    mPopup.setOnItemClickListener(this);
    mPopup.setAdapter(mAdapter);//from   ww  w  .  ja v a 2  s .  co m
    mPopup.setModal(true);

    View anchor = mAnchorView;
    if (anchor != null) {
        final boolean addGlobalListener = mTreeObserver == null;
        mTreeObserver = anchor.getViewTreeObserver(); // Refresh to latest
        if (addGlobalListener)
            mTreeObserver.addOnGlobalLayoutListener(this);
        anchor.addOnAttachStateChangeListener(this);
        mPopup.setAnchorView(anchor);
        mPopup.setDropDownGravity(mDropDownGravity);
    } else {
        return false;
    }

    if (mContentWidth == Integer.MIN_VALUE) {
        mContentWidth = measureContentWidth();
    }
    mPopup.setContentWidth(mContentWidth);
    // Invert the horizontal offset in RTL mode.
    if (ViewCompat.getLayoutDirection(mAnchorView) == ViewCompat.LAYOUT_DIRECTION_RTL) {
        mPopup.setHorizontalOffset(-mPopup.getHorizontalOffset());
    }
    // Implement right gravity manually through horizontal offset pre-KitKat.
    if (Build.VERSION.SDK_INT < Build.VERSION_CODES.KITKAT
            && (Gravity.getAbsoluteGravity(mDropDownGravity, ViewCompat.getLayoutDirection(anchor))
                    & Gravity.HORIZONTAL_GRAVITY_MASK) == Gravity.RIGHT) {
        mPopup.setHorizontalOffset(mPopup.getHorizontalOffset() + (mAnchorView.getWidth() - mPopup.getWidth()));
    }
    // If vertical offset is defined as 0, then ListPopupWindow infers
    // it as the negative of the top padding of the background, in
    // order to anchor the content area. Since that is not the effect
    // we want, we'll force it to use only the explicitly defined
    // offset by explicitly setting it dynamically as well, and thus
    // forcing it to discard it's 'unset' flag.
    mPopup.setVerticalOffset(mPopup.getVerticalOffset());
    // Top/bottom padding will be applied on the background drawable,
    // as the ListView is both initialized and set up only after show()
    // is called on the ListPopupWindow. Left/right padding will be
    // set up on the list items from the adapter, to keep the correct
    // item boundaries for the selector.
    ShapeDrawable paddedDrawable = new ShapeDrawable();
    paddedDrawable.setAlpha(0);
    // Don't apply top padding if the first item is a header, to
    // comply with the design.
    paddedDrawable.setPadding(0, mAdapter.hasHeader() ? 0 : (mPopupPaddingTop - mPopupItemVerticalPadding), 0,
            mPopupPaddingBottom - mPopupItemVerticalPadding);
    Drawable background = mPopup.getBackground();
    mPopup.setBackgroundDrawable(background == null ? paddedDrawable
            : new LayerDrawable(new Drawable[] { background, paddedDrawable }));
    mPopup.setInputMethodMode(PopupWindow.INPUT_METHOD_NOT_NEEDED);
    mPopup.show();
    mPopup.getListView().setOnKeyListener(this);
    return true;
}

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