set Camera Metering area via Camera Parameter - Android android.os

Android examples for android.os:Parcel

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Description

set Camera Metering area via Camera Parameter

Demo Code

/*//ww  w .j  a  v  a  2s  .  c  om
 * Copyright (C) 2014 ZXing authors
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
//package com.java2s;
import java.util.Arrays;
import java.util.Collection;
import java.util.Collections;
import java.util.Iterator;
import java.util.List;

import android.annotation.TargetApi;
import android.graphics.Rect;
import android.hardware.Camera;
import android.os.Build;
import android.util.Log;

public class Main {
    private static final String TAG = "CameraConfiguration";
    private static final int AREA_PER_1000 = 400;

    @TargetApi(Build.VERSION_CODES.ICE_CREAM_SANDWICH_MR1)
    public static void setMetering(Camera.Parameters parameters) {
        if (parameters.getMaxNumMeteringAreas() > 0) {
            Log.i(TAG,
                    "Old metering areas: " + parameters.getMeteringAreas());
            List<Camera.Area> middleArea = buildMiddleArea(AREA_PER_1000);
            Log.i(TAG, "Setting metering area to : " + toString(middleArea));
            parameters.setMeteringAreas(middleArea);
        } else {
            Log.i(TAG, "Device does not support metering areas");
        }
    }

    @TargetApi(Build.VERSION_CODES.ICE_CREAM_SANDWICH_MR1)
    private static List<Camera.Area> buildMiddleArea(int areaPer1000) {
        return Collections.singletonList(new Camera.Area(new Rect(
                -areaPer1000, -areaPer1000, areaPer1000, areaPer1000), 1));
    }

    private static String toString(Collection<int[]> arrays) {
        if (arrays == null || arrays.isEmpty()) {
            return "[]";
        }
        StringBuilder buffer = new StringBuilder();
        buffer.append('[');
        Iterator<int[]> it = arrays.iterator();
        while (it.hasNext()) {
            buffer.append(Arrays.toString(it.next()));
            if (it.hasNext()) {
                buffer.append(", ");
            }
        }
        buffer.append(']');
        return buffer.toString();
    }

    @TargetApi(Build.VERSION_CODES.ICE_CREAM_SANDWICH_MR1)
    private static String toString(Iterable<Camera.Area> areas) {
        if (areas == null) {
            return null;
        }
        StringBuilder result = new StringBuilder();
        for (Camera.Area area : areas) {
            result.append(area.rect).append(':').append(area.weight)
                    .append(' ');
        }
        return result.toString();
    }
}

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