Is there a simple example of the PopupWindow class using Android v2.0?

问题

I looked online and was not able to find a working example of the PopupWindow class. The code examples I found online either compile but do not work, or are using methods which have since been removed (such as Activity.getViewInflate()).

Is there a simple working example that displays a PopupWindow?

回答1:

I created a working example based on this Google Groups post.

To create a simple working PopupWindow, you'll need to do the following:

Create a layout XML which describes the View that will be rendered within the PopupWindow.
Invoke the PopupWindow by inflating the layout XML, and assign the appropriate "parent view" to the pop-up.

popup_example.xml:

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical"
    android:padding="10dip"
    android:layout_width="fill_parent"
    android:layout_height="wrap_content"
    >

    <TextView
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:layout_marginTop="10dip"
        android:text="Test Pop-Up"
    />

</LinearLayout>

Java code:

    LayoutInflater inflater = (LayoutInflater)
       this.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
    PopupWindow pw = new PopupWindow(
       inflater.inflate(R.layout.popup_example, null, false), 
       100, 
       100, 
       true);
    // The code below assumes that the root container has an id called 'main'
    pw.showAtLocation(this.findViewById(R.id.main), Gravity.CENTER, 0, 0);

回答2:

AFAIK only the AbsoluteLayout works(pls confirm), as seen on http://sree.cc/google/android/android-popup-window . I've shown the popup right, but LinearLayout was not showing all elements. But AbsoluteLayout is deprecated!

FrameLayout also works, but organizing views is a nightmare since the official documentation says it is only good for holding one view.

Also, to be able to receive touch events, you need to do this: setBackgroundDrawable(new BitmapDrawable());

as further explained at Android popup window dismissal

回答3:

You are getting the invisibility because you didn't set the Background color of the layout to whom you are inflated.set it as android:background="#778899",and definitely you can see the things

来源：https://stackoverflow.com/questions/1967863/is-there-a-simple-example-of-the-popupwindow-class-using-android-v2-0

标签

android

android-popupwindow