Android Open Source - esr-scanner Preview Callback

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License

The source code is released under:

Apache License

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Java Source Code

/*
 * Copyright (C) 2010 ZXing authors/*ww w.  j a v a2  s .c om*/
 * Copyright 2011 Robert Theis
 *
 * 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 ch.luklanis.esscan.camera;

import android.graphics.Point;
import android.hardware.Camera;
import android.os.Handler;
import android.os.Message;
import android.util.Log;

/**
 * Called when the next preview frame is received.
 * <p/>
 * The code for this class was adapted from the ZXing project: http://code.google.com/p/zxing
 */
final class PreviewCallback implements Camera.PreviewCallback {

    private static final String TAG = PreviewCallback.class.getSimpleName();

    private final CameraConfigurationManager configManager;
    private Handler previewHandler;
    private int previewMessage;

    PreviewCallback(CameraConfigurationManager configManager) {
        this.configManager = configManager;
    }

    void setHandler(Handler previewHandler, int previewMessage) {
        this.previewHandler = previewHandler;
        this.previewMessage = previewMessage;
    }

    // Since we're not calling setPreviewFormat(int), the data arrives here in the YCbCr_420_SP
    // (NV21) format.
    @Override
    public void onPreviewFrame(byte[] data, Camera camera) {
        Point cameraResolution = configManager.getCameraResolution();
        Handler thePreviewHandler = previewHandler;
        if (thePreviewHandler != null) {
            Message message = thePreviewHandler.obtainMessage(previewMessage,
                    cameraResolution.x,
                    cameraResolution.y,
                    data);
            message.sendToTarget();
            previewHandler = null;
        } else {
            Log.d(TAG, "Got preview callback, but no handler for it");
        }
    }

}

Java Source Code List