Main.java Source code

Introduction

Here is the source code for Main.java

Source

//package com.java2s;
//License from project: Apache License 

import android.app.Activity;

import android.graphics.Point;

import android.hardware.Camera.Size;
import android.os.Build;
import android.util.Log;
import android.view.Display;

import java.util.List;

public class Main {
    private static final String TAG = "Util";

    public static Size getOptimalPreviewSize(Activity currentActivity, List<Size> sizes, double targetRatio) {
        // Use a very small tolerance because we want an exact match.
        final double ASPECT_TOLERANCE = 0.001;
        if (sizes == null)
            return null;
        Size optimalSize = null;
        double minDiff = Double.MAX_VALUE;
        // Because of bugs of overlay and layout, we sometimes will try to
        // layout the viewfinder in the portrait orientation and thus get the
        // wrong size of preview surface. When we change the preview size, the
        // new overlay will be created before the old one closed, which causes
        // an exception. For now, just get the screen size.
        Point point = getDefaultDisplaySize(currentActivity, new Point());
        int targetHeight = Math.min(point.x, point.y);
        // Try to find an size match aspect ratio and size
        for (Size size : sizes) {
            double ratio = (double) size.width / size.height;
            if (Math.abs(ratio - targetRatio) > ASPECT_TOLERANCE)
                continue;
            if (Math.abs(size.height - targetHeight) < minDiff) {
                optimalSize = size;
                minDiff = Math.abs(size.height - targetHeight);
            }
        }
        // Cannot find the one match the aspect ratio. This should not happen.
        // Ignore the requirement.
        if (optimalSize == null) {
            Log.w(TAG, "No preview size match the aspect ratio");
            minDiff = Double.MAX_VALUE;
            for (Size size : sizes) {
                if (Math.abs(size.height - targetHeight) < minDiff) {
                    optimalSize = size;
                    minDiff = Math.abs(size.height - targetHeight);
                }
            }
        }
        return optimalSize;
    }

    @SuppressWarnings("deprecation")
    private static Point getDefaultDisplaySize(Activity activity, Point size) {
        Display d = activity.getWindowManager().getDefaultDisplay();
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.HONEYCOMB_MR2) {
            d.getSize(size);
        } else {
            size.set(d.getWidth(), d.getHeight());
        }
        return size;
    }
}