android fragmentmanager

1. inheritance relationship Java. Lang. Object |____ Android. App. fragmentmanager 2. class overview This class provides interfaces for interacting with fragment objects in the activity. Although fragmentmanager APIs are introduced in the honeycomb version, there is also an API version used by the fragmentactivity class on the old platform. Honeycomb: http://deve

1. inheritance relationship Java. lang. Object |____ Android. app. FragmentManager 2. class overview This class provides interfaces for interacting with Fragment objects in the Activity. Although FragmentManager APIs are introduced in the HONEYCOMB version, there is also an API version used by the FragmentActivity class on the old platform. HONEYCOMB: http://deve

The use of Android fragment 1. Use Support Library If your application needs to run in versions 3.0 and above, you can ignore this part of the content. If your application uses a version below 3.0, 1.6, or more, you need to use a support library to build it. To use the Support library: 1. Use the SDK Manager tool under the SDK to download the Android Support Package 2. Create a libs directory under th

. Possible null pointer exceptions are Getfragmentmanager () and Findfragmentbyid () two calls. Findfragmentbyid () should be less likely to have a null pointer exception, and two fragment in the layout file are obvious. Then it can only be said that Getfragmentmanager () This call appears with a pointer. In fragment's development documentation, it is clear that fragment management is implemented through Fragmentmanager, so where does the problem aris

错误：java.lang.NullPointerException11-15 09:04:21.023: E/AndroidRuntime(4057): at android.support.v4.app.BackStackRecord.run(BackStackRecord.java:591)11-15 09:04:21.023: E/AndroidRuntime(4057): at android.support.v4.app.FragmentManagerImpl.execPendingActions(FragmentManager.java:1416Execute code:if (mcurtransaction! = null) { Mcurtransaction.commitallowingstateloss (); if (manager! = null) manager.executependingtransactions ();Cause: If the fragment is

These days found a problem I used Getfragmentmanager () Get Fragmentmanager can not put into fragmentpageradapter inside. Because the fragmentpageradapter inside the structure parameter must be the Fragmentmanager under the V4 package, And I activty inside Getfragmentmanager get is under the app package Fragmentmanager there is a conflictThe general solution is n

(zygoteinit.java:1025) at Dalvik.system.NativeStart.main (Native Method)This happens only with mapfragment. Placeholderfragment is just normal.UpdateFragment_map.xmlWorkaround 1:Duplicate ID issues are related to using nested fragments incorrectly.From: http://developer.android.com/about/versions/android-4.2.html#NestedFragments Note: You cannot inflate the layout to a fragment when the layout contains . Only nested fragments are supported

For FragmentManager findFragmentById, return nul, findfragmentbyid First, let's look at the two generation methods of Fragment. 1. Generate with xml tags Add an xml tag to the fragment's host activity. 1 The fragment class created by name for you This method has already generated fragment when the activity is created. Operations for obtaining fragment instances in an Activity: 1 NewsContentFragment fragment = (NewsContentFragment) getFrag

Why use fragment to manage the user interface?Using fragment can make the interface more flexible and adapt well to different sizes of screens. It is recommended to use the classes in the Support library (android.support.v4.app.*) to implement the latest API features to fragment by upgrading the project's support libraryHow do I use fragment to manage the user interface?Step one: Add a dependency in Androidstudio because the support library must be included in the dependency relationship in the

The fragment is a new component introduced in 3.0, and is used frequently in projects where the V4 package is fragment to be backwards compatible before 3.0. Let's say 3.0 fragment usage. Among them, fragment's life cycle is not much to say, first constructs the Fragment view object. @Override public View Oncreateview (layoutinflater inflater, ViewGroup container, Bundle savedinstancestate) { //TODO auto-generated method stub View v = inflater.inflate (r.layout.fragment02, null); retu

Question: How does the system know if the user is sliding a (the page in the black box) or B (the FGM in the red box)Answer:-dispatchtouchevent, Onintercepttouchevent, ontoucheventProblem Resolution:This can be said to be an Android event handling problem, first introduce the great God said these three events "Each view subclass in the Android system has the following three methods that are closely related

The fragment is a new component introduced in 3.0, and is used frequently in projects where the V4 package is fragment to be backwards compatible before 3.0.Let's say 3.0 fragment usage.Among them, fragment's life cycle is not much to say, first constructs the Fragment view object.@Overridepublic View Oncreateview (layoutinflater inflater, ViewGroup container,bundle savedinstancestate) {//TODO Auto-generated method Stubview v = inflater.inflate (r.layout.fragment02, null); return v;}The target f

. app. activity; import android. app. fragmentManager; import android. app. fragmentTransaction; import android. OS. bundle; import android. view. menu; import android. view. view; import andr