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Generate barcode in an AsyncTask

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This change moves the generation of the barcode into its
own async task. In addition, the size of the ImageView is
used to determine the barcode size to use.

There will be cases when the size of the ImageView will not
be known when the barcode generation starts. This will be resolved
in a future commit.
This commit is contained in:
Branden Archer
2016-05-21 18:21:53 -04:00
parent b8d4eaacad
commit b91d4c934a
2 changed files with 98 additions and 49 deletions
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91
app/src/main/java/protect/card_locker/BarcodeImageWriterTask.java Normal file
View File

@@ -0,0 +1,91 @@
package protect.card_locker;
import android.graphics.Bitmap;
import android.os.AsyncTask;
import android.util.Log;
import android.widget.ImageView;
import com.google.zxing.BarcodeFormat;
import com.google.zxing.MultiFormatWriter;
import com.google.zxing.WriterException;
import com.google.zxing.common.BitMatrix;
import java.lang.ref.WeakReference;
/**
* This task will generate a barcode and load it into an ImageView.
* Only a weak reference of the ImageView is kept, so this class will not
* prevent the ImageView from being garbage collected.
*/
class BarcodeImageWriterTask extends AsyncTask<Void, Void, Bitmap>
{
private static final String TAG = "LoyaltyCardLocker";
private final WeakReference<ImageView> imageViewReference;
private final String cardId;
private final BarcodeFormat format;
private final int imageHeight;
private final int imageWidth;
public BarcodeImageWriterTask(ImageView imageView, String cardIdString,
BarcodeFormat barcodeFormat)
{
// Use a WeakReference to ensure the ImageView can be garbage collected
imageViewReference = new WeakReference<>(imageView);
cardId = cardIdString;
format = barcodeFormat;
imageHeight = imageView.getHeight();
imageWidth = imageView.getWidth();
}
public Bitmap doInBackground(Void... params)
{
MultiFormatWriter writer = new MultiFormatWriter();
BitMatrix bitMatrix;
try
{
bitMatrix = writer.encode(cardId, format, imageWidth, imageHeight, null);
final int WHITE = 0xFFFFFFFF;
final int BLACK = 0xFF000000;
int bitMatrixWidth = bitMatrix.getWidth();
int bitMatrixHeight = bitMatrix.getHeight();
int[] pixels = new int[bitMatrixWidth * bitMatrixHeight];
for (int y = 0; y < bitMatrixHeight; y++)
{
int offset = y * bitMatrixWidth;
for (int x = 0; x < bitMatrixWidth; x++)
{
int color = bitMatrix.get(x, y) ? BLACK : WHITE;
pixels[offset + x] = color;
}
}
Bitmap bitmap = Bitmap.createBitmap(bitMatrixWidth, bitMatrixHeight,
Bitmap.Config.ARGB_8888);
bitmap.setPixels(pixels, 0, bitMatrixWidth, 0, 0, bitMatrixWidth, bitMatrixHeight);
return bitmap;
}
catch (WriterException | IllegalArgumentException e)
{
Log.e(TAG, "Failed to generate barcode", e);
}
return null;
}
protected void onPostExecute(Bitmap result)
{
ImageView imageView = imageViewReference.get();
if(imageView == null)
{
// The ImageView no longer exists, nothing to do
return;
}
imageView.setImageBitmap(result);
}
}

56
app/src/main/java/protect/card_locker/LoyaltyCardViewActivity.java
View File

@@ -2,7 +2,6 @@ package protect.card_locker;
import android.content.Intent;
import android.graphics.Bitmap;
import android.os.Bundle;
import android.support.design.widget.Snackbar;
import android.support.v7.app.ActionBar;
@@ -17,9 +16,6 @@ import android.widget.EditText;
import android.widget.ImageView;
import com.google.zxing.BarcodeFormat;
import com.google.zxing.MultiFormatWriter;
import com.google.zxing.WriterException;
import com.google.zxing.common.BitMatrix;
import com.google.zxing.integration.android.IntentIntegrator;
import com.google.zxing.integration.android.IntentResult;
@@ -149,52 +145,14 @@ public class LoyaltyCardViewActivity extends AppCompatActivity
if(cardIdField.getText().length() > 0 && barcodeTypeField.getText().length() > 0)
{
MultiFormatWriter writer = new MultiFormatWriter();
BitMatrix result;
try
{
String formatString = barcodeTypeField.getText().toString();
BarcodeFormat format = BarcodeFormat.valueOf(formatString);
if(format == null)
{
throw new IllegalArgumentException("Unrecognized barcode format: " + formatString);
}
String formatString = barcodeTypeField.getText().toString();
final BarcodeFormat format = BarcodeFormat.valueOf(formatString);
final String cardIdString = cardIdField.getText().toString();
int generateWidth = 100;
int generateHeight = 100;
new BarcodeImageWriterTask(barcodeImage, cardIdString, format).execute();
String cardIdString = cardIdField.getText().toString();
Log.i(TAG, "Card: " + cardIdString);
result = writer.encode(cardIdString, format, generateWidth, generateHeight, null);
final int WHITE = 0xFFFFFFFF;
final int BLACK = 0xFF000000;
int width = result.getWidth();
int height = result.getHeight();
int[] pixels = new int[width * height];
for (int y = 0; y < height; y++)
{
int offset = y * width;
for (int x = 0; x < width; x++)
{
pixels[offset + x] = result.get(x, y) ? BLACK : WHITE;
}
}
Bitmap bitmap = Bitmap.createBitmap(width, height,
Bitmap.Config.ARGB_8888);
bitmap.setPixels(pixels, 0, width, 0, 0, width, height);
barcodeImage.setImageBitmap(bitmap);
barcodeIdLayout.setVisibility(View.VISIBLE);
barcodeImageLayout.setVisibility(View.VISIBLE);
}
catch (WriterException | IllegalArgumentException e)
{
Log.e(TAG, "Failed to generate barcode", e);
}
barcodeIdLayout.setVisibility(View.VISIBLE);
barcodeImageLayout.setVisibility(View.VISIBLE);
}
View.OnClickListener captureCallback = new View.OnClickListener()
@@ -332,4 +290,4 @@ public class LoyaltyCardViewActivity extends AppCompatActivity
}
}
}
}
}