我正在创建一个Android项目，主要功能是扫描条形码
我尝试将Zxing库集成到我的项目中，并且工作正常。
但是，它似乎不支持从Android设备库中的可用图像扫描条形码。
我怎么做？或与其他条形码库？
请帮帮我
谢谢你的所有答案。
答案 0 :(得分：13)
您可以使用ZXing库中的此类MultiFormatReader。
你必须在BitMap中获取Gallery图像并将其转换为：
Bitmap bMap = [...];
String contents = null;
int[] intArray = new int[bMap.getWidth()*bMap.getHeight()];
//copy pixel data from the Bitmap into the 'intArray' array
bMap.getPixels(intArray, 0, bMap.getWidth(), 0, 0, bMap.getWidth(), bMap.getHeight());
LuminanceSource source = new RGBLuminanceSource(bMap.getWidth(), bMap.getHeight(), intArray);
BinaryBitmap bitmap = new BinaryBitmap(new HybridBinarizer(source));
Reader reader = new MultiFormatReader();
Result result = reader.decode(bitmap);
contents = result.getText();
<强> UPDATE1
要操纵大图，请查看：
https://developer.android.com/training/articles/memory.html
https://developer.android.com/training/displaying-bitmaps/manage-memory.html
您可以使用此属性android:largeHeap来增加堆大小。
答案 1 :(得分：2)
我有一个关于如何实现这个的工作样本，如果你在2016年阅读我是如何做到的：
public class MainActivity extends AppCompatActivity implements View.OnClickListener {
//initialize variables to make them global
private ImageButton Scan;
private static final int SELECT_PHOTO = 100;
//for easy manipulation of the result
public String barcode;
//call oncreate method
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
//cast neccesary variables to their views
Scan = (ImageButton)findViewById(R.id.ScanBut);
//set a new custom listener
Scan.setOnClickListener(this);
//launch gallery via intent
Intent photoPic = new Intent(Intent.ACTION_PICK);
photoPic.setType("image/*");
startActivityForResult(photoPic, SELECT_PHOTO);
}
//do necessary coding for each ID
@Override
public void onClick(View v) {
switch (v.getId()){
case R.id.ScanBut:
//launch gallery via intent
Intent photoPic = new Intent(Intent.ACTION_PICK);
photoPic.setType("image/*");
startActivityForResult(photoPic, SELECT_PHOTO);
break;
}
}
//call the onactivity result method
@Override
protected void onActivityResult(int requestCode, int resultCode, Intent imageReturnedIntent) {
super.onActivityResult(requestCode, resultCode, imageReturnedIntent);
switch (requestCode) {
case SELECT_PHOTO:
if (resultCode == RESULT_OK) {
//doing some uri parsing
Uri selectedImage = imageReturnedIntent.getData();
InputStream imageStream = null;
try {
//getting the image
imageStream = getContentResolver().openInputStream(selectedImage);
} catch (FileNotFoundException e) {
Toast.makeText(getApplicationContext(), "File not found", Toast.LENGTH_SHORT).show();
e.printStackTrace();
}
//decoding bitmap
Bitmap bMap = BitmapFactory.decodeStream(imageStream);
Scan.setImageURI(selectedImage);// To display selected image in image view
int[] intArray = new int[bMap.getWidth() * bMap.getHeight()];
// copy pixel data from the Bitmap into the 'intArray' array
bMap.getPixels(intArray, 0, bMap.getWidth(), 0, 0, bMap.getWidth(),
bMap.getHeight());
LuminanceSource source = new RGBLuminanceSource(bMap.getWidth(),
bMap.getHeight(), intArray);
BinaryBitmap bitmap = new BinaryBitmap(new HybridBinarizer(source));
Reader reader = new MultiFormatReader();// use this otherwise
// ChecksumException
try {
Hashtable<DecodeHintType, Object> decodeHints = new Hashtable<DecodeHintType, Object>();
decodeHints.put(DecodeHintType.TRY_HARDER, Boolean.TRUE);
decodeHints.put(DecodeHintType.PURE_BARCODE, Boolean.TRUE);
Result result = reader.decode(bitmap, decodeHints);
//*I have created a global string variable by the name of barcode to easily manipulate data across the application*//
barcode = result.getText().toString();
//do something with the results for demo i created a popup dialog
if(barcode!=null){
AlertDialog.Builder builder = new AlertDialog.Builder(this);
builder.setTitle("Scan Result");
builder.setIcon(R.mipmap.ic_launcher);
builder.setMessage("" + barcode);
AlertDialog alert1 = builder.create();
alert1.setButton(DialogInterface.BUTTON_POSITIVE, "Done", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
Intent i = new Intent (getBaseContext(),MainActivity.class);
startActivity(i);
}
});
alert1.setCanceledOnTouchOutside(false);
alert1.show();}
else
{
AlertDialog.Builder builder = new AlertDialog.Builder(this);
builder.setTitle("Scan Result");
builder.setIcon(R.mipmap.ic_launcher);
builder.setMessage("Nothing found try a different image or try again");
AlertDialog alert1 = builder.create();
alert1.setButton(DialogInterface.BUTTON_POSITIVE, "Done", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
Intent i = new Intent (getBaseContext(),MainActivity.class);
startActivity(i);
}
});
alert1.setCanceledOnTouchOutside(false);
alert1.show();
}
//the end of do something with the button statement.
} catch (NotFoundException e) {
Toast.makeText(getApplicationContext(), "Nothing Found", Toast.LENGTH_SHORT).show();
e.printStackTrace();
} catch (ChecksumException e) {
Toast.makeText(getApplicationContext(), "Something weird happen, i was probably tired to solve this issue", Toast.LENGTH_SHORT).show();
e.printStackTrace();
} catch (FormatException e) {
Toast.makeText(getApplicationContext(), "Wrong Barcode/QR format", Toast.LENGTH_SHORT).show();
e.printStackTrace();
} catch (NullPointerException e) {
Toast.makeText(getApplicationContext(), "Something weird happen, i was probably tired to solve this issue", Toast.LENGTH_SHORT).show();
e.printStackTrace();
}
}
}
}
}
答案 2 :(得分：0)
我处于同一场景之间，它抛出 NotFoundException ，official doc说
在图像中未找到条形码时抛出。可能是 部分检测到但无法确认。
一级解决方案 在某种程度上， @Laurent 答案几乎适用于我所拥有的每个样本，但很少能通过。
下一个解决方案在@Lucien Mendela建议的reader.decode（..）之前添加了解码提示就可以了。
Hashtable<DecodeHintType, Object> decodeHints = new Hashtable<DecodeHintType, Object>();
decodeHints.put(DecodeHintType.TRY_HARDER, Boolean.TRUE); // Not required in my case
decodeHints.put(DecodeHintType.PURE_BARCODE, Boolean.TRUE);
但最后一件对我有用的东西
参考 添加以下几个类似的问题：
可用于验证图像的工具：
答案 3 :(得分：0)
首先，当然，请从图库中读取图像（可以在您的活动中进行）： Help by
Intent pickIntent = new Intent(Intent.ACTION_PICK);
pickIntent.setDataAndType( android.provider.MediaStore.Images.Media.EXTERNAL_CONTENT_URI, "image/*");
startActivityForResult(pickIntent, 111);
之后，只需获取活动结果上的图像uri，然后ZXing就会发挥作用：
@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
super.onActivityResult(requestCode, resultCode, data);
switch (requestCode) {
//the case is because you might be handling multiple request codes here
case 111:
if(data == null || data.getData()==null) {
Log.e("TAG", "The uri is null, probably the user cancelled the image selection process using the back button.");
return;
}
Uri uri = data.getData();
try
{
InputStream inputStream = getContentResolver().openInputStream(uri);
Bitmap bitmap = BitmapFactory.decodeStream(inputStream);
if (bitmap == null)
{
Log.e("TAG", "uri is not a bitmap," + uri.toString());
return;
}
int width = bitmap.getWidth(), height = bitmap.getHeight();
int[] pixels = new int[width * height];
bitmap.getPixels(pixels, 0, width, 0, 0, width, height);
bitmap.recycle();
bitmap = null;
RGBLuminanceSource source = new RGBLuminanceSource(width, height, pixels);
BinaryBitmap bBitmap = new BinaryBitmap(new HybridBinarizer(source));
MultiFormatReader reader = new MultiFormatReader();
try
{
Result result = reader.decode(bBitmap);
Toast.makeText(this, "The content of the QR image is: " + result.getText(), Toast.LENGTH_SHORT).show();
}
catch (NotFoundException e)
{
Log.e("TAG", "decode exception", e);
}
}
catch (FileNotFoundException e)
{
Log.e("TAG", "can not open file" + uri.toString(), e);
}
break;
}
}