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This can happen either because the activity is finishing someone called finish on it, or because the system is temporarily destroying this instance of the activity to save space. You can distinguish between these two scenarios with the isFinishing method.
Yes nothing Note the "Killable" column in the above table -- for those methods that are marked as being killable, after that method returns the process hosting the activity may be killed by the system at any time without another line of its code being executed.
Because of this, you should use the onPause method to write any persistent data such as user edits to storage.
In addition, the method onSaveInstanceState Bundle is called before placing the activity in such a background state, allowing you to save away any dynamic instance state in your activity into the given Bundle, to be later received in onCreate Bundle if the activity needs to be re-created.
See the Process Lifecycle section for more information on how the lifecycle of a process is tied to the activities it is hosting. Note that it is important to save persistent data in onPause instead of onSaveInstanceState Bundle because the latter is not part of the lifecycle callbacks, so will not be called in every situation as described in its documentation.
Be aware that these semantics will change slightly between applications targeting platforms starting with Build.
Starting with Honeycomb, an application is not in the killable state until its onStop has returned. This impacts when onSaveInstanceState Bundle may be called it may be safely called after onPause and allows an application to safely wait until onStop to save persistent state.
For applications targeting platforms starting with Build.
P onSaveInstanceState Bundle will always be called after onStopso an application may safely perform fragment transactions in onStop and will be able to save persistent state later. Thus an activity is in the killable state, for example, between after onPause to the start of onResume.
Configuration Changes If the configuration of the device as defined by the Resources. Configuration class changes, then anything displaying a user interface will need to update to match that configuration.
Because Activity is the primary mechanism for interacting with the user, it includes special support for handling configuration changes. Unless you specify otherwise, a configuration change such as a change in screen orientation, language, input devices, etc will cause your current activity to be destroyed, going through the normal activity lifecycle process of onPauseonStopand onDestroy as appropriate.
If the activity had been in the foreground or visible to the user, once onDestroy is called in that instance then a new instance of the activity will be created, with whatever savedInstanceState the previous instance had generated from onSaveInstanceState Bundle. This is done because any application resource, including layout files, can change based on any configuration value.
Thus the only safe way to handle a configuration change is to re-retrieve all resources, including layouts, drawables, and strings. Because activities must already know how to save their state and re-create themselves from that state, this is a convenient way to have an activity restart itself with a new configuration.
In some special cases, you may want to bypass restarting of your activity based on one or more types of configuration changes. This is done with the android: If a configuration change involves any that you do not handle, however, the activity will still be restarted and onConfigurationChanged Configuration will not be called.
Starting Activities and Getting Results The startActivity Intent method is used to start a new activity, which will be placed at the top of the activity stack.
It takes a single argument, an Intentwhich describes the activity to be executed. Sometimes you want to get a result back from an activity when it ends.
For example, you may start an activity that lets the user pick a person in a list of contacts; when it ends, it returns the person that was selected. To do this, you call the startActivityForResult Intent, int version with a second integer parameter identifying the call. The result will come back through your onActivityResult int, int, Intent method.
When an activity exits, it can call setResult int to return data back to its parent. In addition, it can optionally return back an Intent containing any additional data it wants. For content provider data, we suggest that activities use an "edit in place" user model.Android-InsecureBankv2.
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