RF / xiangdianwms · Files

package com.zbar.scan;

import android.app.Activity;
import android.content.Intent;
import android.graphics.Rect;
import android.hardware.Camera;
import android.media.MediaPlayer;
import android.os.Bundle;
import android.os.Handler;
import android.text.TextUtils;
import android.view.Display;
import android.view.View;
import android.view.WindowManager;
import android.view.animation.Animation;
import android.view.animation.TranslateAnimation;
import android.widget.FrameLayout;
import android.widget.ImageView;
import android.widget.RelativeLayout;
import android.widget.TextView;

import com.dtr.zbar.build.ZBarDecoder;
import com.lijinji.product.R;
import com.lijinji.product.product.ProductUnloadingActivity;

import java.io.IOException;
import java.lang.reflect.Field;

public class ScanActivity extends Activity {

    private Camera mCamera;
    private CameraPreview mPreview;
    private Handler autoFocusHandler;
    private CameraManager mCameraManager;

    private TextView scanResult;
    private FrameLayout scanPreview;
    private RelativeLayout scanContainer;
    private RelativeLayout scanCropView;
    private ImageView scanLine, manualInputBackImage;

    private Rect mCropRect = null;
    private boolean barcodeScanned = false;
    private boolean previewing = true;
    ZBarDecoder zBarDecoder;
    private MediaPlayer mMediaPlayer;

    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.zbar_scan_capture);
        zBarDecoder = new ZBarDecoder();
        setLight(this, 255);
        findViewById();
        initViews();
        initSound();
    }

    private void initSound() {
        mMediaPlayer = MediaPlayer.create(this, R.raw.beep);
        mMediaPlayer.setLooping(false);
        try {
            mMediaPlayer.prepareAsync();
        } catch (IllegalStateException e) {
            e.printStackTrace();
        }
        mMediaPlayer.setVolume((float)0.4f,(float)0.4f);
        mMediaPlayer.setOnCompletionListener(
                new MediaPlayer.OnCompletionListener()
                {
                    @Override
                    public void onCompletion(MediaPlayer arg0)
                    {

                    }
                });
    }

    private void findViewById() {
        scanPreview = (FrameLayout) findViewById(R.id.capture_preview);
        scanResult = (TextView) findViewById(R.id.capture_scan_result);
        scanContainer = (RelativeLayout) findViewById(R.id.capture_container);
        scanCropView = (RelativeLayout) findViewById(R.id.capture_crop_view);
        scanLine = (ImageView) findViewById(R.id.capture_scan_line);
        manualInputBackImage = (ImageView) findViewById(R.id.manualInputBackImage);
        manualInputBackImage.setOnClickListener(new View.OnClickListener() {

            @Override
            public void onClick(View v) {
                // TODO Auto-generated method stub
                onBackPressed();
            }
        });
    }


    private void initViews() {
        autoFocusHandler = new Handler();
        mCameraManager = new CameraManager(this);
        try {
            mCameraManager.openDriver();
        } catch (IOException e) {
            e.printStackTrace();
        }

        Display display = this.getWindowManager().getDefaultDisplay();
        int width = display.getWidth();
        int height = display.getHeight();

        RelativeLayout.LayoutParams linearParams =  (RelativeLayout.LayoutParams)scanCropView.getLayoutParams();
        linearParams.height = (int) (width*0.4);
        linearParams.width = (int) (width*0.4);
        scanCropView.setLayoutParams(linearParams);

        mCamera = mCameraManager.getCamera();
        mPreview = new CameraPreview(this, mCamera, previewCb, autoFocusCB);
        scanPreview.addView(mPreview);

        TranslateAnimation animation = new TranslateAnimation(Animation.RELATIVE_TO_PARENT, 0.0f, Animation.RELATIVE_TO_PARENT, 0.0f, Animation.RELATIVE_TO_PARENT, 0.0f, Animation.RELATIVE_TO_PARENT,
                0.85f);
        animation.setDuration(5000);
        animation.setRepeatCount(-1);
        animation.setRepeatMode(Animation.REVERSE);
        scanLine.startAnimation(animation);
    }

    public void onPause() {
        super.onPause();
        releaseCamera();
    }

    private void releaseCamera() {
        if (mCamera != null) {
            previewing = false;
            mCamera.setPreviewCallback(null);
            mCamera.release();
            mCamera = null;
        }
    }

    private Runnable doAutoFocus = new Runnable() {
        public void run() {
            if (previewing)
                mCamera.autoFocus(autoFocusCB);
        }
    };

    private void setLight(Activity context, int brightness) {
        WindowManager.LayoutParams lp = context.getWindow().getAttributes();
        lp.screenBrightness = Float.valueOf(brightness) * (1f / 255f);
        context.getWindow().setAttributes(lp);
    }

    Camera.PreviewCallback previewCb = new Camera.PreviewCallback() {
        public void onPreviewFrame(byte[] data, Camera camera) {
            Camera.Size size = camera.getParameters().getPreviewSize();

            byte[] rotatedData = new byte[data.length];
            for (int y = 0; y < size.height; y++) {
                for (int x = 0; x < size.width; x++)
                    rotatedData[x * size.height + size.height - y - 1] = data[x + y * size.width];
            }

            int tmp = size.width;
            size.width = size.height;
            size.height = tmp;

            initCrop();

            long oldtime = System.currentTimeMillis();
            String result = zBarDecoder.decodeCrop(rotatedData, size.width, size.height, mCropRect.left, mCropRect.top, mCropRect.width(), mCropRect.height());

            if (!TextUtils.isEmpty(result)) {
                long waste = System.currentTimeMillis() - oldtime;
                previewing = false;
                mCamera.setPreviewCallback(null);
                mCamera.stopPreview();
                mMediaPlayer.start();
                barcodeScanned = true;
                finish();
                startUnloadingActivity(result);
            }
        }
    };

    // Mimic continuous auto-focusing
    Camera.AutoFocusCallback autoFocusCB = new Camera.AutoFocusCallback() {
        public void onAutoFocus(boolean success, Camera camera) {
            autoFocusHandler.postDelayed(doAutoFocus, 1000);
        }
    };

    private void startUnloadingActivity(String result) {
        Intent intent = new Intent();
        Bundle bundle = new Bundle();
        bundle.putString("result", result);
        intent.putExtras(bundle);
        intent.setClass(this, ProductUnloadingActivity.class);
        startActivity(intent);
    }

    private void initCrop() {
        int cameraWidth = mCameraManager.getCameraResolution().y;
        int cameraHeight = mCameraManager.getCameraResolution().x;

        int[] location = new int[2];
        scanCropView.getLocationInWindow(location);

        int cropLeft = location[0];
        int cropTop = location[1] - getStatusBarHeight();

        int cropWidth = scanCropView.getWidth();
        int cropHeight = scanCropView.getHeight();

        int containerWidth = scanContainer.getWidth();
        int containerHeight = scanContainer.getHeight();

        int x = cropLeft * cameraWidth / containerWidth;
        int y = cropTop * cameraHeight / containerHeight;

        int width = cropWidth * cameraWidth / containerWidth;
        int height = cropHeight * cameraHeight / containerHeight;

        mCropRect = new Rect(x, y, width + x, height + y);
    }

    private int getStatusBarHeight() {
        try {
            Class<?> c = Class.forName("com.android.internal.R$dimen");
            Object obj = c.newInstance();
            Field field = c.getField("status_bar_height");
            int x = Integer.parseInt(field.get(obj).toString());
            return getResources().getDimensionPixelSize(x);
        } catch (Exception e) {
            e.printStackTrace();
        }
        return 0;
    }
}