Java Android Development - Getting Element By Id

When developing Android applications in Java, it's crucial to be able to manipulate the elements on the screen. In order to do this, you need to be able to get the element by its unique ID.

Finding the Element by ID

The following code shows an example of how to find an element in the layout XML file by its ID.

TextView myTextView = findViewById(R.id.my_text_view);

In this example, we are finding a TextView element with the ID "my_text_view". The findViewById method returns a reference to the element, which we then store in the myTextView variable.

Manipulating the Element

Once you have the element reference, you can manipulate it in various ways. For example, you can change the text of a TextView element with the following code.

myTextView.setText("Hello, World!");

Or you can change the background color of a View element with the following code.

View myView = findViewById(R.id.my_view);
myView.setBackgroundColor(Color.BLUE);

Conclusion

Getting an element by its ID is a fundamental skill in Android development. With this knowledge, you can manipulate the elements on the screen and create engaging user interfaces.