Pre-Honeycomb (Android 3), each Activity was registered to handle button clicks via the onClick tag in a Layout’s XML: android:onClick=”myClickMethod” Within that method you can use view.getId() and a switch statement to do the button logic. With the introduction of Honeycomb I’m breaking these Activities into Fragments which can be reused inside many different Activities. Most … Read more
Fragments seem to be very nice for separation of UI logic into some modules. But along with ViewPager its lifecycle is still misty to me. So Guru thoughts are badly needed! Edit See dumb solution below 😉 Scope Main activity has a ViewPager with fragments. Those fragments could implement a little bit different logic for … Read more
I am playing with fragments in Android. I know I can change a fragment by using the following code: FragmentManager fragMgr = getSupportFragmentManager(); FragmentTransaction fragTrans = fragMgr.beginTransaction(); MyFragment myFragment = new MyFragment(); //my custom fragment fragTrans.replace(android.R.id.content, myFragment); fragTrans.addToBackStack(null); fragTrans.setTransition(FragmentTransaction.TRANSIT_FRAGMENT_FADE); fragTrans.commit(); My question is, in a Java file, how can I get the currently displayed Fragment … Read more
I have found many instances of a similar question on SO but no answer unfortunately meets my requirements. I have different layouts for portrait and landscape and I am using back stack, which both prevents me from using setRetainState() and tricks using configuration change routines. I show certain information to the user in TextViews, which … Read more
I’m getting user reports from my app in the market, delivering the following exception: java.lang.IllegalStateException: Can not perform this action after onSaveInstanceState at android.app.FragmentManagerImpl.checkStateLoss(FragmentManager.java:1109) at android.app.FragmentManagerImpl.popBackStackImmediate(FragmentManager.java:399) at android.app.Activity.onBackPressed(Activity.java:2066) at android.app.Activity.onKeyUp(Activity.java:2044) at android.view.KeyEvent.dispatch(KeyEvent.java:2529) at android.app.Activity.dispatchKeyEvent(Activity.java:2274) at com.android.internal.policy.impl.PhoneWindow$DecorView.dispatchKeyEvent(PhoneWindow.java:1803) at android.view.ViewGroup.dispatchKeyEvent(ViewGroup.java:1112) at android.view.ViewGroup.dispatchKeyEvent(ViewGroup.java:1112) at android.view.ViewGroup.dispatchKeyEvent(ViewGroup.java:1112) at com.android.internal.policy.impl.PhoneWindow$DecorView.superDispatchKeyEvent(PhoneWindow.java:1855) at com.android.internal.policy.impl.PhoneWindow.superDispatchKeyEvent(PhoneWindow.java:1277) at android.app.Activity.dispatchKeyEvent(Activity.java:2269) at com.android.internal.policy.impl.PhoneWindow$DecorView.dispatchKeyEvent(PhoneWindow.java:1803) at android.view.ViewGroup.dispatchKeyEvent(ViewGroup.java:1112) at android.view.ViewGroup.dispatchKeyEvent(ViewGroup.java:1112) at … Read more
Is there a way in which we can implement onBackPressed() in Android Fragment similar to the way in which we implement in Android Activity? As the Fragment lifecycle do not have onBackPressed(). Is there any other alternative method to over ride onBackPressed() in Android 3.0 fragments? 56 s 56
In Android API 11+, Google has released a new class called Fragment. In the videos, Google suggests that whenever possible (link1, link2), we should use fragments instead of activities, but they didn’t explain exactly why. What’s the purpose of fragments and some possible uses of them (other than some UI examples that can be easily … Read more
How can I get the context in a fragment? I need to use my database whose constructor takes in the context, but getApplicationContext() and FragmentClass.this don’t work so what can I do? Database constructor public Database(Context ctx) { this.context = ctx; DBHelper = new DatabaseHelper(context); } 3Best Answer 31
I have seen two general practices to instantiate a new Fragment in an application: Fragment newFragment = new MyFragment(); and Fragment newFragment = MyFragment.newInstance(); The second option makes use of a static method newInstance() and generally contains the following method. public static Fragment newInstance() { MyFragment myFragment = new MyFragment(); return myFragment; } At first, … Read more
Problem: Fragment onResume() in ViewPager is fired before the fragment becomes actually visible. For example, I have 2 fragments with ViewPager and FragmentPagerAdapter. The second fragment is only available for authorized users and I need to ask the user to log in when the fragment becomes visible (using an alert dialog). BUT the ViewPager creates … Read more
