Sep 09, 2014  Solution Steps Write and Read Text File: As well as the standard Java I/O classes and methods, android also offers openFileInput and openFileOuput to modify reading and writing streams from and to local files. In android to create a file and saving, you can use the openFileOutput method and openFileInput method to open a file for reading. The common actions you can safely take with a given Context object depends on where it came from originally. Below is a table of the common places an application will receive a Context, and in each case what it is useful for: An application CAN start an Activity from here, but it requires that a new task be created.

• Android Context Class

Android Context Class

You need to register your menu with.FromIn order for a View to provide acontext menu, you must 'register' theview for a context menu. CallregisterForContextMenu and pass itthe View you want to give a contextmenu. When this View then receives along-press, it displays a contextmenu.Your code above works just fine. You just need to register the content menu to a view.If you want to launch the context menu from anywhere in the screen:Let's say your layout main.xml is like the following: You will register the context menu you have created with the following (in onCreate): LinearLayout layout = (LinearLayout)findViewById(R.id.mainLayout);registerForContextMenu(layout);So if you run this in the emulator, and do a long-click on the Android desktop, your menu will pop up.

In Android, is used to display information for a period of time. It contains a message to be displayed quickly and disappears after specified period of time. It does not block the user interaction. Is a subclass of Object class.

In this we use two constants for setting the duration for the. Toast notification in android always appears near the bottom of the screen.

We can also create our custom toast by using custom layout( file).Special Note: In Android, Toast is used when we required to notify user about an operation without expecting any user input. It displays a small popup for message and automatically fades out after timeout.