Android Tutorial-Making a custom Android button using a custom view

Android Tutorial-Making a custom Android button using a custom view

Creating a custom view is as simple as inheriting from the View class and overriding the methods that need to be overridden. In this example, a custom button is implemented in this way. The button shall feature a labelled image (i.e. an image with text underneath).

1 public class CustomImageButton extends View {
2 private final static int WIDTH_PADDING = 8;
3 private final static int HEIGHT_PADDING = 10;
4 private final String label;
5 private final int imageResId;
6 private final Bitmap image;
7 private final InternalListener listenerAdapter = new InternalListener();
8

The constructor can take in the parameters to set the button image and label.


9 /**
10 * Constructor.
11 *
12 * @param context
13 * Activity context in which the button view is being placed for.
14 *
15 * @param resImage
16 * Image to put on the button. This image should have been placed
17 * in the drawable resources directory.
18 *
19 * @param label
20 * The text label to display for the custom button.
21 */
22 public CustomImageButton(Context context, int resImage, String label)
23 {
24 super(context);
25 this.label = label;
26 this.imageResId = resImage;
27 this.image = BitmapFactory.decodeResource(context.getResources(),
28 imageResId);
29
30 setFocusable(true);
31 setBackgroundColor(Color.WHITE);
32
33 setOnClickListener(listenerAdapter);
34 setClickable(true);
35 }
36

With the constructor defined, there are a number of methods in the View class that needs to be overridden to this view behave like a button. Firstly, the onFocusChanged gets triggered when the focus moves onto or off the view. In the case of our custom button, we want the button to be “highlighted” when ever the focus is on the button.

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