For a detailed perspective on the structure of an. Android application and how activities behave, please read the. Application Fundamentals and. Tasks and Back Stack.
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You can also find a detailed discussion about how to create activities in the. Fragments. Starting with HONEYCOMB, Activity. Fragment class to better. If an activity has lost focus but is still visible (that is, a new non- full- sized. A paused activity is completely alive (it. It still retains all state and member information. If an activity is paused or stopped, the system can drop the activity.
It is strongly. discouraged; instead, applications should use more formal. Content. Provider. Broadcast. Receiver, and Service. It is strongly. discouraged; instead, applications should use more formal. Content. Provider. Broadcast. Receiver, and Service.
Constant Value. (0x. RESULT. Constant Value. RESULT. Constant Value. Fields. FOCUSED. If the options menu is already. When the exit Transition completes.
If no entry Transition was used, finish() is called. Activity exit Transition is run. And. Remove. Task.
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And. Remove. Task ()Call this when your activity is done and should be closed and the task should be completely. The logical parent is named in the application's manifest. Activity. Name attribute. This is often used in. Stop() to determine whether the state needs to be cleaned up or will be passed.
Retain. Non. Configuration. Instance(). Returnsboolean.
If the activity is being torn down in order to be recreated with a new configuration. This is valid only for the duration of the. Returnsbooleanwhether the current voice interaction service supports local voice interaction.
Task. Root ()Return whether this activity is the root of a task. However, if. you call stop. Managing. Cursor(Cursor) on a cursor from a managed query, the system will.
Parametersuri. Uri. The URI of the content provider to query. String. List of columns to return. String. SQL WHERE clause. Args. String. The arguments to selection, if any ? Order. String. SQL ORDER BY clause. Returns. Cursor. The Cursor that was returned by query().
Task. To. Back. boolean move. Task. To. Back (boolean non. Root)Move the task containing this activity to the back of the activity. If the activity indicated by up. Intent already exists in the task's history. This can be useful in apps with a complex navigation hierarchy.
This method should be used when performing up navigation from within the same task. If up navigation should cross tasks in some cases, see. Up. Recreate. Task(Intent). Parametersup. Intent. Intent. An intent representing the target destination for up navigation.
Returnsbooleantrue if up navigation successfully reached the activity indicated by up. Intent and. up. Intent was delivered to it. This method will only be called if the activity. RESULT. A call to. Activity has or will be exiting soon.
The. default implementation simply returns false to have the normal processing. Runnable or sending a message to its Handler. You can use this method for any items for which you. This information will vary. Applications. may choose to override this method to construct the desired task stack in a different. This method will be invoked by the default implementation of on. Navigate. Up(). if should.
Up. Recreate. Task(Intent) returns true when supplied with the intent. Parent. Activity. Intent(). Applications that wish to supply extra Intent parameters to the parent stack defined. Prepare. Navigate. Up. Task. Stack(Task. Stack. Builder). Parametersbuilder.
Task. Stack. Builder. An empty Task. Stack. Builder - the application should add intents representing.
Create. Options. Menu. Create. Options. Menu (Menu menu)Initialize the contents of the Activity's standard options menu. This. simply returns null so that all panel sub- windows will have the default.
Return null for the default. In order. to know when it is safe to begin drawing they can override this method which will be. So, for example, key presses while the cursor. Text. View will not trigger the event (unless it is a navigation. Text. View handles its own key presses. So, for example, key presses while the cursor.
Text. View will not trigger the event (unless it is a navigation. Text. View handles its own key presses.
The previously acquired Voice. Interactor. is no longer valid after this. This may also be. Parametersfeature.
Idint. The panel that the menu is in. Menu. The menu that is opened. Returnsboolean. The default implementation returns true. If any activity. along the parent chain requires extra Intent arguments, the Activity subclass. Prepare. Navigate. Up. Task. Stack(Task.
Stack. Builder). to supply those arguments. See Tasks and Back Stack. Navigation. from the design guide for more information about navigating within your app. See the Task. Stack.
Builder class and the Activity methods. Parent. Activity. Intent(), should. Up. Recreate. Task(Intent), and. Up. To(Intent) for help implementing custom Up navigation. This method. is invoked for every call on request.
Permissions(String. In this case you will receive empty permissions. Unless overidden. Search(null, false, null, false), which launches.
Search. Manager. Activities that override this method must call. Visible. Behind. Canceled() or a Super.
Not. Called. Exception will be thrown. Otherwise on. Stop() will be called following return. Window. Attributes.
Changed. void on. Window. Attributes. Changed (Window. Manager. Layout. Params params)This is called whenever the current window attributes change. Gives the. callback an opportunity to handle the action mode in its own unique and.
If this method returns null the system can choose a way. If the options menu is already. These permissions. PROTECTION. Signature permissions. PROTECTION. After the user has accepted or rejected the. Request. Permissions. Result(int, String.
Hence, you should be prepared that your activity. Further, granting some permissions may require. In such a case, the system will recreate the. Request. Permissions.
Result(int, String. This. can be useful if the way your app uses data guarded by the permissions. If this call is successful then the activity will remain visible after. Pause() is called, and is allowed to continue playing media in the background. That is, every time on. Resume() is called the activity will be assumed.
Therefore, if you want this activity to continue to. Resources must be. Returnsbooleanthe resulting visibiity state. If true the activity will remain visible beyond. Pause() if the next activity is translucent or not fullscreen. If false. then the activity may not count on being visible behind other translucent activities. If the current thread is the UI.
If the current thread is. UI thread, the action is posted to the event queue of the UI thread. Parametersaction. Runnable. the action to run on the UI thread. Action. Bar (Toolbar toolbar)Set a Toolbar to act as the Action.
Bar for this. Activity window. The toolbar's menu will be populated with the. Activity's options menu and the navigation button will be wired through the standard. In order to use a Toolbar within the Activity's window content the application.
FEATURE. To use. your own layout parameters, invoke. Content. View(android. View, android. view. View. Group. Layout. Params). instead. Parametersview. View.
The desired content to display. Content. View. void set.
Content. View (int layout. Res. ID)Set the activity content from a layout resource. Other modes allow you to launch the dialer. DEFAULT. Media key and. Activity is in the foreground. This may be used instead of or in addition to. Volume. Control. Stream(int) to affect a specific session instead of a.
To reset back to the default use. Parameterscontroller. Media. Controller. The controller for the session which should receive. Valid ranges are from.
If 1. 00. 00 is given, the progress. Progress. Bar. Indeterminate. Progress. Bar. Indeterminate (boolean indeterminate). This method was deprecated. API level 2. 4. No longer supported starting in API 2.
Otherwise, this will be used the next. Result. void set. Result (int result. Code. Intent data)Call this to set the result that your activity will return to its. Progress(int) and the background. It can be ideal for media. Valid ranges are from.
Task. Description. Task. Description (Activity.
Manager. Task. Description task. Description)Sets information describing the task with this activity for presentation inside the Recents. System UI. When get. Recent. Tasks(int, int) is called, the activities of each task. The traversal continues. For each task the task.
Description will be. Activity. Manager. Task. Description. Parameterstask. Description. Activity. Manager. Task. Description. The Task. Description properties that describe the task with this activity.
Theme (int resid)Set the base theme for this context. For information on styling the Action Bar, read the Action Bar developer. Visible. void set. Visible (boolean visible)Control whether this activity's main window is visible.
To reset back to the default, use. USE. If however, the app needs location for tagging photos then a non- tech. In this case. you may choose to show UI with rationale of requesting this permission.
If this method returns false, the app should synthesize a new task stack. Task. Stack. Builder or another similar mechanism to perform up navigation. Parameterstarget. Intent. Intent. An intent representing the target destination for up navigation. Returnsbooleantrue if navigating up should recreate a new task stack, false if the same task.
Assist (Bundle args)Ask to have the current assistant shown to the user. The task containing this activity must be in lock task mode at the time. When ready. on. Local.
Voice. Interaction. Started() is called. You can pass a bundle of private options. Parametersprivate.
Options. Bundle. a Bundle of private arguments to the current voice interaction service. Lock. Task ()Request to put this Activity in a mode where the user is locked to the. This does not include those apps whose lock. Task. Mode. values permit launching while locked. The user will not be able to exit this mode until.
Lock. Task() is called.