Main.java Source code

Introduction

Here is the source code for Main.java

Source

//package com.java2s;
/*
 * 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.
 */

import android.annotation.SuppressLint;

import android.hardware.Camera;

import android.util.Log;

import java.util.Arrays;
import java.util.Collection;

import java.util.Iterator;
import java.util.List;

public class Main {
    private static final String TAG = "CameraConfiguration";
    private static final int MIN_FPS = 10;
    private static final int MAX_FPS = 20;

    public static void setBestPreviewFPS(Camera.Parameters parameters) {
        setBestPreviewFPS(parameters, MIN_FPS, MAX_FPS);
    }

    @SuppressLint("NewApi")
    public static void setBestPreviewFPS(Camera.Parameters parameters, int minFPS, int maxFPS) {
        List<int[]> supportedPreviewFpsRanges = parameters.getSupportedPreviewFpsRange();
        Log.i(TAG, "Supported FPS ranges: " + toString(supportedPreviewFpsRanges));
        if (supportedPreviewFpsRanges != null && !supportedPreviewFpsRanges.isEmpty()) {
            int[] suitableFPSRange = null;
            for (int[] fpsRange : supportedPreviewFpsRanges) {
                int thisMin = fpsRange[Camera.Parameters.PREVIEW_FPS_MIN_INDEX];
                int thisMax = fpsRange[Camera.Parameters.PREVIEW_FPS_MAX_INDEX];
                if (thisMin >= minFPS * 1000 && thisMax <= maxFPS * 1000) {
                    suitableFPSRange = fpsRange;
                    break;
                }
            }
            if (suitableFPSRange == null) {
                Log.i(TAG, "No suitable FPS range?");
            } else {
                int[] currentFpsRange = new int[2];
                parameters.getPreviewFpsRange(currentFpsRange);
                if (Arrays.equals(currentFpsRange, suitableFPSRange)) {
                    Log.i(TAG, "FPS range already set to " + Arrays.toString(suitableFPSRange));
                } else {
                    Log.i(TAG, "Setting FPS range to " + Arrays.toString(suitableFPSRange));
                    parameters.setPreviewFpsRange(suitableFPSRange[Camera.Parameters.PREVIEW_FPS_MIN_INDEX],
                            suitableFPSRange[Camera.Parameters.PREVIEW_FPS_MAX_INDEX]);
                }
            }
        }
    }

    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();
    }
}