PreferenceFragment: How to remove transparency?

crushdepth · November 27th, 2011, 03:35 AM

In the PreferenceFragment Try It Out, the resulting fragment is transparent (see figure 3-22), you can still see the "Hello world" in the background fragment. If there is text on the background fragment, this can make it very difficult to read the preferences.

How can I make the preference fragment opaque? Thanks.

crushdepth · November 27th, 2011, 04:26 AM

Ok I figured it out. I had defined the initial fragment in the XML file for the main view. You can't replace a fragment defined in this way via a fragment transaction - you can only replace fragments that you added programmatically. That's why the initial fragment remained visible in the background.

So the solution was to remove the initial fragment from main.xml layout file, and add it to the initial view using fragmentTransaction.add() instead. This way the initial fragment is successfully replaced when the preference fragment is called, and is no longer visible in the background.

SirPali · December 2nd, 2011, 06:19 PM

I ran into this exact same problem.

I'm creating an app with 2 seperate fragments, both within their own RelativeLayout. These fragments get added programmatically to these layouts during the initialization stage.
When trying to call the PreferenceFragment, it turns transparent exactly like you described.
I'm trying to replace the content in my fragments, it's still transparent. When I try to replace the entire content of the app, it's still transparent.

Now from your comment I understand you managed to fix it by removing the fragments from your main layout file, but how did your layout end up after that?

I'm pretty sure I'm on the right track but I'd like to see your final fix to push me in the right direction.

Arielle12 · December 3rd, 2011, 02:07 AM

hi
We additional openness to some div container. I want to take away the transparency of the contents of which div. I want to add some text in it, but the text seems to bee transparent similar to the pot, even when it has been assigned a different div and set transparency in order to 100%
How do i do this?
thanks

SirPali · December 3rd, 2011, 07:08 AM

I eventually fixed it by just calling a new Intent that launches the Preference screen.
Quite a simple fix, but it works fine.

Prefs.java

Code:

public class ReaderPreferences extends PreferenceActivity {
		@Override
		public void onCreate(Bundle savedInstanceState) {
			super.onCreate(savedInstanceState);
			// --load the preferences from an XML file---
			addPreferencesFromResource(R.xml.preference);
		}

In my main screen when pressing a button:

Code:

Intent i = new Intent(this, Prefs.class);
			startActivity(i);

That's all. After setting the preferences simply press the back button and you're done.

Dont forget to add Prefs to your Manifest!