set Camera Torch on via Parameter - Android android.os

Android examples for android.os:Parcel

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Description

set Camera Torch on via Parameter

Demo Code

/*/* www  .j a  va2 s.  co m*/
 * 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.Iterator;
import java.util.List;

import android.annotation.TargetApi;

import android.hardware.Camera;
import android.os.Build;
import android.util.Log;

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

    public static void setTorch(Camera.Parameters parameters, boolean on) {
        List<String> supportedFlashModes = parameters
                .getSupportedFlashModes();
        String flashMode;
        if (on) {
            flashMode = findSettableValue("flash mode",
                    supportedFlashModes,
                    Camera.Parameters.FLASH_MODE_TORCH,
                    Camera.Parameters.FLASH_MODE_ON);
        } else {
            flashMode = findSettableValue("flash mode",
                    supportedFlashModes, Camera.Parameters.FLASH_MODE_OFF);
        }
        if (flashMode != null) {
            if (flashMode.equals(parameters.getFlashMode())) {
                Log.i(TAG, "Flash mode already set to " + flashMode);
            } else {
                Log.i(TAG, "Setting flash mode to " + flashMode);
                parameters.setFlashMode(flashMode);
            }
        }
    }

    private static String findSettableValue(String name,
            Collection<String> supportedValues, String... desiredValues) {
        Log.i(TAG,
                "Requesting " + name + " value from among: "
                        + Arrays.toString(desiredValues));
        Log.i(TAG, "Supported " + name + " values: " + supportedValues);
        if (supportedValues != null) {
            for (String desiredValue : desiredValues) {
                if (supportedValues.contains(desiredValue)) {
                    Log.i(TAG, "Can set " + name + " to: " + desiredValue);
                    return desiredValue;
                }
            }
        }
        Log.i(TAG, "No supported values match");
        return null;
    }

    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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