  Using 65 million $\Upsilon(4S)\to B\bar{B}$ events collected with the BABAR
detector at the PEP-II $e^{+}e^{-}$ storage ring at the Stanford Linear
Accelerator Center, we measure the color-favored branching fractions ${\cal
B}(\bar{B^{0}} \to D^{+} \pi^{-}) = (2.55 \pm 0.05 \pm 0.16)\times 10^{-3}$,
${\cal B}(\bar{B^{0}} \to D^{*+} \pi^{-}) = (2.79 \pm 0.08 \pm 0.17)\times
10^{-3}$, ${\cal B}(B^{-} \to D^{0} \pi^{-}) = (4.90 \pm 0.07 \pm 0.22)\times
10^{-3}$ and ${\cal B}(B^{-} \to D^{*0} \pi^{-}) = (5.52 \pm 0.17 \pm
0.42)\times 10^{-3}$, where the first error is statistical and the second is
systematic. With these results and the current world average for the branching
fraction for the color-suppressed decay $\bar{B^{0}} \to D^{(*)0}\pi^{0}$, the
cosines of the strong phase difference $\delta$ between the $I=1/2$ and $I=3/2$
isospin amplitudes are determined to be $ \cos \delta =
0.872^{+0.008+0.031}_{-0.007-0.029}$ for the $\bar{B} \to D\pi$ process and $
\cos \delta = 0.924^{+0.019+0.063}_{-0.017-0.054}$ for the $\bar{B} \to
D^{*}\pi$ process. Under the isospin symmetry, the results for $\cos \delta$
suggest that final-state interactions are present in the $D\pi$ system.
