Android Camera Set setTorch(Camera.Parameters parameters, boolean on)

Description

set Torch

License

Apache License

Declaration

public static void setTorch(Camera.Parameters parameters, boolean on) 

Method Source Code

//package com.java2s;
/*/*www .j  a v a 2 s.c  o 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.
 */

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";

    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();
    }

    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();
    }
}

Related

1. setCameraDisplayOrientation(Context mContext, int cameraId, Camera camera)
2. setFocus(Camera.Parameters parameters, boolean autoFocus, boolean disableContinuous, boolean safeMode)
3. setFocusArea(Camera.Parameters parameters)
4. setInvertColor(Camera.Parameters parameters)
5. setMetering(Camera.Parameters parameters)
6. setVideoStabilization(Camera.Parameters parameters)
7. setZoom(Camera.Parameters parameters, double targetZoomRatio)
8. getBackId()
9. adjustCamera(Context context, Camera camera)