Question

For example i have view which have id :

<ImageButton
        android:id="@+id/imageButtonStart"
        android:layout_width="100dp"
        android:layout_height="100dp" />

Does i need made private field with the same name, like this:

private ImageButton imageButtonStart;

Answer 1

Although it is good practice to keep things consistent and use the same name for your variable, you do not need to call your class variable the same as the id within your XML, as you’ll manually connect these up within your code such as:

ImageButton imageButtonNotStart = (ImageButton) this.findViewById(R.id.imageButtonStart);

My personal preference is use to the format componentTypeDescriptiveName such as imageButtonStart within the XML, but within code I prefer a more English driven approach, such as startButton.

Typically I end up with

<ImageButton
        android:id="@+id/imageButtonStart"
        android:layout_width="100dp"
        android:layout_height="100dp" />

ImageButton startButton = (ImageButton) this.findViewById(R.id.imageButtonStart);