Camera预览尺寸和获取屏幕宽高。

算法需要将预览大小与手机的分辨率挂钩，才能够在不同分辨率的手机上面预览都不变形。

/** * 获取最佳预览大小 * @param parameters 相机参数 * @param screenResolution 屏幕宽高 * @return */ private Point getBestCameraResolution(Camera.Parameters parameters, Point screenResolution) { float tmp = 0f; float mindiff = 100f; float x_d_y = (float) screenResolution.x / (float) screenResolution.y; Size best = null; List<Size> supportedPreviewSizes = parameters.getSupportedPreviewSizes(); for (Size s : supportedPreviewSizes) { tmp = Math.abs(((float) s.height / (float) s.width) - x_d_y); if (tmp < mindiff) { mindiff = tmp; best = s; } } return new Point(best.width, best.height); }

获取屏幕宽高的方法如下：

/** * 获取屏幕宽度和高度，单位为px * @param context * @return */ public static Point getScreenMetrics(Context context){ DisplayMetrics dm =context.getResources().getDisplayMetrics(); int w_screen = dm.widthPixels; int h_screen = dm.heightPixels; return new Point(w_screen, h_screen); }