What is a bundle in an Android application

Question

What is a bundle in an Android application  When to use it

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Bundle is used to pass data between Activities  You can create a bundle  pass it to Intent that starts the activity which then can be used from the destination activity

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A Bundle is very much like a Java Map object that maps String keys to values  It s used to pass information between activities and other application components  It s also used by the framework to capture and restore state information   The reason Android doesn t use plain old Map objects for this is that Map is too flexible  it can contain objects  such as  say  I O streams  that cannot be serialized  The Bundle API restricts the types of objects that can be added to a bundle in such a way that the bundle s contents are guaranteed to be serializable  The Android framework relies on this property   I suggest that you read the documentation on Application Fundamentals  This explains  among other things  what bundles and intents are and what they are used for

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Pass data between activities by using Bundle and Intent objects     Your first create a Bundle object  Bundle b   new Bundle      Then  associate the string data stored in anystring with bundle key  myname   b putString  myname   anystring     Now  create an Intent object  Intent in   new Intent getApplicationContext    secondActivity class     Pass bundle object b to the intent  in putExtras b     and start second activity  startActivity in       In the second activity  we have to access the data passed from the first activity  Intent in   getIntent      Now  you need to get the data from the bundle  Bundle b   in getExtras      Finally  get the value of the string data associated with key named  myname   String s   b getString  myname

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use of bundle send data from one activity to another activity with the help of intent object  Bundle hold the data that can be any type   Now I  tell that how to create bundle passing data between two activity   Step 1  On First activity  Bundle b new Bundle     b putString  mkv  anystring    Intent in new Intent getApplicationContext   secondActivity class    in putExtras b    startActivity in     Step 2  On Second Activity  Intent in getIntent     Bundle b in getExtras     String s b getString  mkv      I think this is useful for you

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Bundle is not only to transfer data between two different components but more importantly it is used to restore the values stored before activity is destroyed into new activity   such as the text in an EditText widget or the scroll position of a ListView

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Bundles are generally used for passing data between various Android activities  It depends on you what type of values you want to pass  but bundles can hold all types of values and pass them to the new activity   You can use it like this   Intent intent   new    Intent getApplicationContext    SecondActivity class   intent putExtra  myKey   AnyValue     startActivity intent     You can get the passed values by doing   Bundle extras   intent getExtras     String tmp   extras getString  myKey      You can find more info at    android-using-bundle-for-sharing-variables and Passing-Bundles-Around-Activities

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Just create a bundle     Bundle simple bundle new Bundle    simple bundle putString  item1   value1    Intent i new Intent getApplicationContext   this is the next class class   i putExtras simple bundle   startActivity i       IN the  this is the next class class   You can retrieve the items like this   Intent receive i getIntent    Bundle my bundle received receive i getExtras    my bundle received get  item1    Log d  Value   --  my bundle received get  item1   toString

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Bundle - A mapping from String values to various Parcelable types   Bundle is generally used for passing data between various activities of android   when we call onPause   then onStop   and then in reverse order onStop   to onPause     The saved data that the system uses to restore the previous state is called the  instance state  and is a collection of key-value pairs stored in a Bundle object

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First activity   String food    String   Spinner findViewById R id food   getSelectedItem    RadioButton rb    RadioButton  findViewById R id rb   Intent i   new Intent this secondActivity class   i putExtra  food  food   i putExtra  rb  rb isChecked       Second activity   String food   getIntent   getExtras   getString  food    Boolean rb   getIntent   getExtras   getBoolean  rb

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Bundles can be used to send arbitrary data from one activity to another by way of Intents   When you broadcast an Intent  interested Activities  and other BroadcastRecievers  will be notified of this   An intent can contain a Bundle so that you can send extra data along with the Intent   Bundles are key-value mappings  so in a way they are like a Hash  but they are not strictly limited to a single String   Foo object mapping   Note that only certain data types are considered  Parcelable  and they are explicitly spelled out in the Bundle API

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I have to add that bundles are used by activities to pass data to themselves in the future    When the screen rotates  or when another activity is started  the method protected void onSaveInstanceState Bundle outState  is invoked  and the activity is destroyed  Later  another instance of the activity is created  and public void onCreate Bundle savedInstanceState  is called  When the first instance of activity is created  the bundle is null   and if the bundle is not null  the activity continues some business started by its predecessor   Android automatically saves the text in text fields  but it does not save everything  and subtle bugs sometimes appear   The most common anti-pattern  though  is assuming that onCreate   does just initialization  It is wrong  because it also must restore the state   There is an option to disable this  re-create activity on rotation  behavior  but it will not prevent restart-related bugs  it will just make them more difficult to mention   Note also that the only method whose call is guaranteed when the activity is going to be destroyed is onPause     See the activity life cycle graph in the docs

User · Answer

bundle is used to share data between activities   and to save state of app in oncreate    method so that app will come to know where it was stopped      I hope it helps

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