1.java

public class SquareBitmapView extends View {
    int backgroundColor;
    public SquareBitmapView(Context context) {
        this(context,null);
        init(null);
    }

    public SquareBitmapView(Context context, @Nullable AttributeSet attrs) {
        this(context, attrs, 0);
        init(attrs);
    }

    public SquareBitmapView(Context context, @Nullable AttributeSet attrs, int defStyleAttr) {
        this(context, attrs, defStyleAttr, 0);
        init(attrs);
    }

    public SquareBitmapView(Context context, @Nullable AttributeSet attrs, int defStyleAttr, int defStyleRes) {
        super(context, attrs, defStyleAttr, defStyleRes);
        init(attrs);
    }

    private void init(@Nullable AttributeSet attrs) {
        TypedArray a = getContext().getTheme().obtainStyledAttributes(
                attrs,
                R.styleable.SquareBitmapView,
                0, 0);

        backgroundColor = a.getColor(R.styleable.SquareBitmapView_backgroundColor, 0xFFFF0000);
    }

    @Override public boolean onTouchEvent(MotionEvent event) {
        switch (event.getAction()) {
            case ACTION_UP:
                handleViewClick();
            case ACTION_CANCEL:
                cancelGesture();
            default:
        }
        return false;
    }

    @Override protected void onDraw(Canvas canvas) {
        super.onDraw(canvas);
        canvas.drawColor(backgroundColor);
        Bitmap bmp = BitmapFactory.decodeResource(getContext().getResources(), R.drawable.small_image);
        Rect destination = new Rect(0, 0, getMeasuredWidth(), getMeasuredHeight());
        canvas.drawBitmap(bmp, null, destination, null);
    }

    @Override protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
        int width = MeasureSpec.getSize(widthMeasureSpec);
        int height = MeasureSpec.getSize(heightMeasureSpec);

        //make it square
        width = Math.min(width, height);
        height = Math.min(width, height);
    }

    private void cancelGesture() {...}
    private void handleViewClick() {...}
}