Android Camera 开发系列：设置对焦模式模式

    public String getFocusMode() {        return get(KEY_FOCUS_MODE);    }

@PublicKeypublic static final Key<int[]> CONTROL_AF_AVAILABLE_MODES =        new Key<int[]>("android.control.afAvailableModes", int[].class);

public static final String FOCUS_MODE_AUTO = "auto";public static final String FOCUS_MODE_FIXED = "fixed";public static final String FOCUS_MODE_CONTINUOUS_VIDEO = "continuous-video";public static final String FOCUS_MODE_CONTINUOUS_PICTURE = "continuous-picture";

  public void setFocusMode(String value) {        ...  }
  public void setParameters(Parameters params) {     ...   }
  public final void cancelAutoFocus()  {    ...  }

    /**     * Focus is set at infinity. Applications should not call     * {@link #autoFocus(AutoFocusCallback)} in this mode.     */    public static final String FOCUS_MODE_INFINITY = "infinity";
    /**     * Macro (close-up) focus mode. Applications should call     * {@link #autoFocus(AutoFocusCallback)} to start the focus in this     * mode.     */    public static final String FOCUS_MODE_MACRO = "macro";
    /**     * Focus is fixed. The camera is always in this mode if the focus is not     * adjustable. If the camera has auto-focus, this mode can fix the     * focus, which is usually at hyperfocal distance. Applications should     * not call {@link #autoFocus(AutoFocusCallback)} in this mode.     */    public static final String FOCUS_MODE_FIXED = "fixed";
    /** @hide     * Normal focus mode. Applications should call     * {@link #autoFocus(AutoFocusCallback)} to start the focus in this     * mode.     */    public static final String FOCUS_MODE_NORMAL = "normal";
    /**     * Extended depth of field (EDOF). Focusing is done digitally and     * continuously. Applications should not call {@link     * #autoFocus(AutoFocusCallback)} in this mode.     */    public static final String FOCUS_MODE_EDOF = "edof";
    /**     * Continuous auto focus mode intended for video recording. The camera     * continuously tries to focus. This is the best choice for video     * recording because the focus changes smoothly . Applications still can     * call {@link #takePicture(Camera.ShutterCallback,     * Camera.PictureCallback, Camera.PictureCallback)} in this mode but the     * subject may not be in focus. Auto focus starts when the parameter is     * set.     *     * <p>Since API level 14, applications can call {@link     * #autoFocus(AutoFocusCallback)} in this mode. The focus callback will     * immediately return with a boolean that indicates whether the focus is     * sharp or not. The focus position is locked after autoFocus call. If     * applications want to resume the continuous focus, cancelAutoFocus     * must be called. Restarting the preview will not resume the continuous     * autofocus. To stop continuous focus, applications should change the     * focus mode to other modes.     *     * @see #FOCUS_MODE_CONTINUOUS_PICTURE     */    public static final String FOCUS_MODE_CONTINUOUS_VIDEO = "continuous-video";
    /**     * Continuous auto focus mode intended for taking pictures. The camera     * continuously tries to focus. The speed of focus change is more     * aggressive than {@link #FOCUS_MODE_CONTINUOUS_VIDEO}. Auto focus     * starts when the parameter is set.     *     * <p>Applications can call {@link #autoFocus(AutoFocusCallback)} in     * this mode. If the autofocus is in the middle of scanning, the focus     * callback will return when it completes. If the autofocus is not     * scanning, the focus callback will immediately return with a boolean     * that indicates whether the focus is sharp or not. The apps can then     * decide if they want to take a picture immediately or to change the     * focus mode to auto, and run a full autofocus cycle. The focus     * position is locked after autoFocus call. If applications want to     * resume the continuous focus, cancelAutoFocus must be called.     * Restarting the preview will not resume the continuous autofocus. To     * stop continuous focus, applications should change the focus mode to     * other modes.     *     * @see #FOCUS_MODE_CONTINUOUS_VIDEO     */    public static final String FOCUS_MODE_CONTINUOUS_PICTURE = "continuous-picture";