BarcodeScanCameraActivity.java

package jp.mydns.sys1yagi.android.zxingsample;

import java.util.List;

import android.app.Activity;
import android.content.Intent;
import android.content.res.Configuration;
import android.hardware.Camera;
import android.hardware.Camera.AutoFocusCallback;
import android.hardware.Camera.PreviewCallback;
import android.net.Uri;
import android.os.Bundle;
import android.view.SurfaceHolder;
import android.view.SurfaceView;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.Window;
import android.view.WindowManager;
import android.widget.Toast;

import com.google.zxing.BinaryBitmap;
import com.google.zxing.PlanarYUVLuminanceSource;
import com.google.zxing.Reader;
import com.google.zxing.Result;
import com.google.zxing.common.HybridBinarizer;
import com.google.zxing.qrcode.QRCodeReader;

public class BarcodeScanCameraActivity extends Activity implements
        OnClickListener, AutoFocusCallback {

    private SurfaceView mSurfaceView;
    private Camera mCamera;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

        getWindow().addFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN);
        requestWindowFeature(Window.FEATURE_NO_TITLE);

        mSurfaceView = new SurfaceView(this);
        mSurfaceView.setOnClickListener(this);
        setContentView(mSurfaceView);
    }

    @Override
    protected void onResume() {
        super.onResume();
        SurfaceHolder holder = mSurfaceView.getHolder();
        holder.addCallback(callback);
    }

    protected boolean isPortrait() {
        return (this.getResources().getConfiguration().orientation == Configuration.ORIENTATION_PORTRAIT);
    }

    private SurfaceHolder.Callback callback = new SurfaceHolder.Callback() {
        @Override
        public void surfaceCreated(SurfaceHolder holder) {
            mCamera = Camera.open();
            try {
                mCamera.setPreviewDisplay(holder);
            } catch (Exception e) {
                e.printStackTrace();
            }
        }

        @Override
        public void surfaceChanged(SurfaceHolder holder, int format, int width,
                int height) {
            Camera.Parameters parameters = mCamera.getParameters();
            List<Camera.Size> previewSizes = parameters
                    .getSupportedPreviewSizes();
            Camera.Size previewSize = previewSizes.get(0);
            parameters.setPreviewSize(previewSize.width, previewSize.height);
            if (isPortrait()) {
                mCamera.setDisplayOrientation(90);
            } else {
                mCamera.setDisplayOrientation(0);
            }
            mCamera.setParameters(parameters);
            mCamera.startPreview();
        }

        @Override
        public void surfaceDestroyed(SurfaceHolder holder) {
            mCamera.release();
            mCamera = null;
        }
    };

    @Override
    public void onClick(View v) {
        if (mCamera != null) {
            mCamera.autoFocus(this);
        }
    }

    @Override
    public void onAutoFocus(boolean success, Camera camera) {
        if (success) {
            camera.setOneShotPreviewCallback(mPreviewCallback);
        }
    }

    private PreviewCallback mPreviewCallback = new PreviewCallback() {
        @Override
        public void onPreviewFrame(byte[] data, Camera camera) {
            int previewWidth = camera.getParameters().getPreviewSize().width;
            int previewHeight = camera.getParameters().getPreviewSize().height;

            PlanarYUVLuminanceSource source = new PlanarYUVLuminanceSource(
                    data, previewWidth, previewHeight, 0, 0, previewWidth,
                    previewHeight, false);
            BinaryBitmap bitmap = new BinaryBitmap(new HybridBinarizer(source));

            Reader reader = new QRCodeReader();
            try {

                Result result = reader.decode(bitmap);
                String text = result.getText();

                Intent intent = new Intent();
                intent.setData(Uri.parse(text));
                setResult(RESULT_OK, intent);
                finish();
            } catch (Exception e) {
                e.printStackTrace();
                Toast.makeText(getApplicationContext(), "Not Found",
                        Toast.LENGTH_SHORT).show();
            }
        }
    };

}