showPopupWindow 類似微信+

佈局：

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:paddingTop="5dp"
    android:paddingRight="3dp"
     >

    <ImageView 
        android:id="@+id/triangle"
        android:layout_width="15dp"
        android:layout_height="15dp"
        android:src="@drawable/triangle"
        android:layout_alignParentRight="true"
        android:layout_marginTop="10dp"
        android:layout_marginRight="15dp"
        android:layout_marginBottom="-5dp"
        />
    <LinearLayout 
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:background="@drawable/btn_commit"
        android:layout_below="@id/triangle"
        android:layout_alignParentRight="true"
        android:layout_marginRight="5dp"
        android:orientation="vertical"
        >
        <TextView 
            android:id="@+id/order_dialog_search"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:drawableLeft="@drawable/magnifier"
            android:text="搜索"
            android:textColor="@color/white"
            android:textSize="@dimen/size_15"
            android:gravity="center"
            android:drawablePadding="10dp"
            android:layout_margin="10dp"
            />
        <TextView 
            android:layout_width="match_parent"
            android:layout_height="1dp"
            android:background="@color/white"
            android:layout_marginLeft="5dp"
            android:layout_marginRight="5dp"
            android:alpha="0.4"
            />
        <TextView 
            android:id="@+id/order_dialog_scan"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:drawableLeft="@drawable/scan"
            android:text="二維碼"
            android:textColor="@color/white"
            android:textSize="@dimen/size_15"
            android:gravity="center"
            android:drawablePadding="10dp"
            android:layout_margin="10dp"
            />
    </LinearLayout>
</RelativeLayout>

彈出框

private void showPopupWindow(View view) {
        View contentView = LayoutInflater.from(getActivity()).inflate(R.layout.fragment_order_dialog, null);
        mPopupWindow = new PopupWindow(contentView, LayoutParams.WRAP_CONTENT,LayoutParams.WRAP_CONTENT, true);
        contentView.findViewById(R.id.order_dialog_search).setOnClickListener(this);
        contentView.findViewById(R.id.order_dialog_scan).setOnClickListener(this);
        mPopupWindow.setTouchable(true);
        mPopupWindow.setTouchInterceptor(new OnTouchListener() {
            @Override
            public boolean onTouch(View arg0, MotionEvent arg1) {
                // TODO Auto-generated method stub
                return false;
            }
        });

        mPopupWindow.setOnDismissListener(new OnDismissListener() {
            @Override
            public void onDismiss() {
                    WindowManager.LayoutParams params = getActivity().getWindow().getAttributes();
                    params.alpha = 1f;
                    getActivity().getWindow().setAttributes(params);
                }
            });
        mPopupWindow.setBackgroundDrawable(new BitmapDrawable());
        mPopupWindow.setOutsideTouchable(true);
        mPopupWindow.showAsDropDown(view);
    }

取消框，需要自己調用

private void closePopupWindow() {
        if (mPopupWindow != null && mPopupWindow.isShowing()) {
            mPopupWindow.dismiss();
            mPopupWindow = null;
        }
    }