Main.java Source code

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Here is the source code for Main.java

Source

//package com.java2s;
//License from project: Open Source License 

import java.lang.reflect.Method;

import java.util.List;

import android.hardware.Camera;

public class Main {
    /**
     * Attempts to find the camera preview size as close as possible to the given width and height.
     * If the Android API does not support retrieving available camera preview sizes, this method
     * returns null. Otherwise, returns the camera preview size that minimizes the sum of the
     * differences between the actual and requested height and width.
     */
    public static Camera.Size bestCameraSizeForWidthAndHeight(Camera.Parameters params, int width, int height) {
        // Occasionally width can be less than height, if the device hasn't had time to complete
        // the rotation to landscape when this method is called. Swap the values in that case.
        if (width < height) {
            int tmp = width;
            width = height;
            height = tmp;
        }
        List<Camera.Size> previewSizes = previewSizesForCameraParameters(params);
        if (previewSizes == null || previewSizes.size() == 0)
            return null;

        Camera.Size bestSize = null;
        int bestDiff = 0;
        // Find the preview size that minimizes the difference between width and height.
        for (Camera.Size size : previewSizes) {
            int diff = Math.abs(size.width - width) + Math.abs(size.height - height);
            if (bestSize == null || diff < bestDiff) {
                bestSize = size;
                bestDiff = diff;
            }
        }
        return bestSize;
    }

    /** Returns a list of available camera preview sizes, or null if the Android API to get the sizes is not available.
     */
    @SuppressWarnings("unchecked")
    public static List<Camera.Size> previewSizesForCameraParameters(Camera.Parameters params) {
        try {
            Method m = params.getClass().getMethod("getSupportedPreviewSizes");
            return (List<Camera.Size>) m.invoke(params);
        } catch (Exception ex) {
            return null;
        }
    }
}