Discovering that PreferenceActivity contains deprecated methods (although these are used in the accompanying sample code) The deprecated methods are deprecated as of Android 3.0. They are perfectly fine on all versions of Android, but the direction is to use PreferenceFragment on Android 3.0 and higher. Can anyone tell me whether this was intentional? My guess … Read more
Can use getSupportActionBar() instead of getActionBar() method.
Setting android:windowActionBar=”false” truly disables the ActionBar but then, as you say, getActionBar(); returns null. This is solved by: public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); getWindow().requestFeature(Window.FEATURE_ACTION_BAR); getActionBar().hide(); setContentView(R.layout.splash); // be sure you call this AFTER requestFeature This creates the ActionBar and immediately hides it before it had the chance to be displayed. But now there is … Read more
It turns out there’s more than one problem with that code. A fragment cannot be declared that way, inside the same java file as the activity but not as a public inner class. The framework expects the fragment’s constructor (with no parameters) to be public and visible. Moving the fragment into the Activity as an … Read more
To animate the transition between fragments, or to animate the process of showing or hiding a fragment you use the Fragment Manager to create a Fragment Transaction. Within each Fragment Transaction you can specify in and out animations that will be used for show and hide respectively (or both when replace is used). The following … Read more
You need to use the new android.animation framework (object animators) with FragmentTransaction.setCustomAnimations as well as FragmentTransaction.setTransition. Here’s an example on using setCustomAnimations from ApiDemos’ FragmentHideShow.java: ft.setCustomAnimations(android.R.animator.fade_in, android.R.animator.fade_out); and here’s the relevant animator XML from res/animator/fade_in.xml: <objectAnimator xmlns:android=”http://schemas.android.com/apk/res/android” android:interpolator=”@android:interpolator/accelerate_quad” android:valueFrom=”0″ android:valueTo=”1″ android:propertyName=”alpha” android:duration=”@android:integer/config_mediumAnimTime” /> Note that you can combine multiple animators using <set>, just as you … Read more
Ok, I’ve found a better way. I’m now able to only change the color of the title. You can also tweak the subtitle. Here is my styles.xml: <?xml version=”1.0″ encoding=”utf-8″?> <resources> <style name=”MyTheme” parent=”@android:style/Theme.Holo.Light”> <item name=”android:actionBarStyle”>@style/MyTheme.ActionBarStyle</item> </style> <style name=”MyTheme.ActionBarStyle” parent=”@android:style/Widget.Holo.Light.ActionBar”> <item name=”android:titleTextStyle”>@style/MyTheme.ActionBar.TitleTextStyle</item> </style> <style name=”MyTheme.ActionBar.TitleTextStyle” parent=”@android:style/TextAppearance.Holo.Widget.ActionBar.Title”> <item name=”android:textColor”>@color/red</item> </style> </resources>
#1 & #2 what are the purposes of using a fragment & what are the advantages and disadvantages of using fragments compared to using activities/views/layouts? Fragments are Android’s solution to creating reusable user interfaces. You can achieve some of the same things using activities and layouts (for example by using includes). However; fragments are wired … Read more